VuoEditorComposition.cc

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#include "VuoEditorComposition.hh"
 
#include "VuoCompilerIssue.hh"
#include "VuoComposition.hh"
#include "VuoCompositionMetadata.hh"
#include "VuoEditorWindow.hh"
#include "VuoErrorDialog.hh"
#include "VuoException.hh"
#include "VuoFileType.h"
#include "VuoRendererComment.hh"
#include "VuoRendererFonts.hh"
#include "VuoRendererInputListDrawer.hh"
#include "VuoRendererSignaler.hh"
#include "VuoRendererTypecastPort.hh"
#include "VuoCompilerCable.hh"
#include "VuoCompilerComment.hh"
#include "VuoCompilerComposition.hh"
#include "VuoCompilerDriver.hh"
#include "VuoCompilerException.hh"
#include "VuoCompilerGraph.hh"
#include "VuoCompilerInputEventPort.hh"
#include "VuoCompilerMakeListNodeClass.hh"
#include "VuoCompilerNode.hh"
#include "VuoCompilerPublishedPort.hh"
#include "VuoCompilerPublishedPortClass.hh"
#include "VuoCompilerTriggerPort.hh"
#include "VuoCompilerType.hh"
#include "VuoGenericType.hh"
#include "VuoRunningCompositionLibraries.hh"
#include "VuoComment.hh"
#include "VuoEditor.hh"
#include "VuoErrorMark.hh"
#include "VuoErrorPopover.hh"
#include "VuoModuleManager.hh"
#include "VuoNodeClass.hh"
#include "VuoNodeSet.hh"
#include "VuoPortPopover.hh"
#include "VuoProtocol.hh"
#include "VuoStringUtilities.hh"
#include "VuoInputEditorIcon.hh"
#include "VuoInputEditorManager.hh"
#include "VuoSubcompositionMessageRouter.hh"
#include "VuoEditorUtilities.hh"
#include "VuoNodeAndPortIdentifierCache.hh"
 
#ifdef __APPLE__
#include <ApplicationServices/ApplicationServices.h>
#include <objc/objc-runtime.h>
#endif
 
const qreal VuoEditorComposition::nodeMoveRate                   = 15;  // VuoRendererComposition::minorGridLineSpacing;
const qreal VuoEditorComposition::nodeMoveRateMultiplier         = 4;   // VuoRendererComposition::majorGridLineSpacing / VuoRendererComposition::minorGridLineSpacing
const qreal VuoEditorComposition::componentCollisionRange = 10;
const qreal VuoEditorComposition::showEventsModeUpdateInterval = 1000/20.; // interval, in ms, after which to update component transparency levels and animations while in 'Show Events' mode
const int VuoEditorComposition::initialChangeNodeSuggestionCount = 10; // The initial number of suggestions to list in the "Change (Node) To" context menu
 
Q_DECLARE_METATYPE(VuoRendererNode *)
Q_DECLARE_METATYPE(VuoRendererPort *)
 
 
VuoEditorComposition::VuoEditorComposition(VuoMainWindow *window, VuoComposition *baseComposition) :
    VuoRendererComposition(baseComposition, false, true)
{
#if VUO_PRO
    VuoEditorComposition_Pro();
#endif
 
    this->window = window;
    compiler = NULL;
    inputEditorManager = NULL;
    activeProtocol = NULL;
    runner = NULL;
    runningComposition = NULL;
    runningCompositionActiveDriver = NULL;
    runningCompositionLibraries = NULL;
    stopRequested = false;
    duplicateOnNextMouseMove = false;
    duplicationDragInProgress = false;
    duplicationCancelled = false;
    cursorPosBeforeDuplicationDragMove = QPointF(0,0);
    cableInProgress = NULL;
    cableInProgressWasNew = false;
    cableInProgressShouldBeWireless = false;
    portWithDragInitiated = NULL;
    cableWithYankInitiated = NULL;
    menuSelectionInProgress = false;
    previousNearbyItem = NULL;
    dragStickinessDisabled = false;
    ignoreApplicationStateChangeEvents = false;
    popoverEventsEnabled = true;
    runCompositionQueue = dispatch_queue_create("org.vuo.editor.run", NULL);
    activePortPopoversQueue = dispatch_queue_create("org.vuo.editor.popovers", NULL);
    errorMark = NULL;
    errorMarkingUpdatesEnabled = true;
    triggerPortToRefire = "";
 
    contextMenuDeleteSelected = new QAction(NULL);
    contextMenuHideSelectedCables = new QAction(NULL);
    contextMenuRenameSelected = new QAction(NULL);
    contextMenuRefactorSelected = new QAction(NULL);
    contextMenuPublishPort = new QAction(NULL);
    contextMenuDeleteCables = new QAction(NULL);
    contextMenuHideCables = new QAction(NULL);
    contextMenuUnhideCables = new QAction(NULL);
    contextMenuFireEvent = new QAction(NULL);
    contextMenuAddInputPort = new QAction(NULL);
    contextMenuRemoveInputPort = new QAction(NULL);
    contextMenuSetPortConstant = new QAction(NULL);
    contextMenuEditSelectedComments = new QAction(NULL);
 
    contextMenuChangeNode = NULL;
 
    contextMenuFireEvent->setText(tr("Fire Event"));
    contextMenuHideSelectedCables->setText(tr("Hide"));
    contextMenuRenameSelected->setText(tr("Rename…"));
    contextMenuRefactorSelected->setText(tr("Package as Subcomposition"));
    contextMenuAddInputPort->setText(tr("Add Input Port"));
    contextMenuRemoveInputPort->setText(tr("Remove Input Port"));
    contextMenuSetPortConstant->setText(tr("Edit Value…"));
    contextMenuEditSelectedComments->setText(tr("Edit…"));
 
    connect(contextMenuDeleteSelected, &QAction::triggered, this, static_cast<void (VuoEditorComposition::*)()>(&VuoEditorComposition::deleteSelectedCompositionComponents));
    connect(contextMenuHideSelectedCables, &QAction::triggered, this, &VuoEditorComposition::selectedInternalCablesHidden);
    connect(contextMenuRenameSelected, &QAction::triggered, this, &VuoEditorComposition::renameSelectedNodes);
    connect(contextMenuRefactorSelected, &QAction::triggered, this, &VuoEditorComposition::refactorRequested);
    connect(contextMenuPublishPort, &QAction::triggered, this, &VuoEditorComposition::togglePortPublicationStatus);
    connect(contextMenuDeleteCables, &QAction::triggered, this, &VuoEditorComposition::deleteConnectedCables);
    connect(contextMenuHideCables, &QAction::triggered, this, &VuoEditorComposition::hideConnectedCables);
    connect(contextMenuUnhideCables, &QAction::triggered, this, &VuoEditorComposition::unhideConnectedCables);
    connect(contextMenuFireEvent, &QAction::triggered, this, static_cast<void (VuoEditorComposition::*)()>(&VuoEditorComposition::fireTriggerPortEvent));
    connect(contextMenuAddInputPort, &QAction::triggered, this, &VuoEditorComposition::addInputPort);
    connect(contextMenuRemoveInputPort, &QAction::triggered, this, &VuoEditorComposition::removeInputPort);
    connect(contextMenuEditSelectedComments, &QAction::triggered, this, &VuoEditorComposition::editSelectedComments);
 
    // Use a queued connection to open input editors in order to avoid bug where invoking a
    // QColorDialog by context menu prevents subsequent interaction with the editor window
    // even after the color dialog has been closed.
    connect(contextMenuSetPortConstant, &QAction::triggered, this, &VuoEditorComposition::setPortConstant, Qt::QueuedConnection);
 
    {
        // Workaround for a bug in Qt 5.1.0-beta1 (https://b33p.net/kosada/node/5096).
        // For now, this sets up the actions for a menu, rather than setting up the menu itself.
 
        auto addThrottlingAction = [=](QString label, VuoPortClass::EventThrottling throttling) {
            QAction *action = new QAction(label, this);
            connect(action, &QAction::triggered, [=](){
                emit triggerThrottlingUpdated(action->data().value<VuoRendererPort *>()->getBase(), throttling);
            });
            contextMenuThrottlingActions.append(action);
        };
        addThrottlingAction(tr("Enqueue Events"), VuoPortClass::EventThrottling_Enqueue);
        addThrottlingAction(tr("Drop Events"),    VuoPortClass::EventThrottling_Drop);
    }
 
    {
        // Workaround for a bug in Qt 5.1.0-beta1 (https://b33p.net/kosada/node/5096).
        // For now, this sets up the actions for a menu, rather than setting up the menu itself.
 
        auto addTintAction = [=](QString label, VuoNode::TintColor tint) {
            QAction *action = new QAction(label, this);
            connect(action, &QAction::triggered, [=](){
                static_cast<VuoEditorWindow *>(window)->tintSelectedItems(tint);
            });
 
            // Add a color swatch to the menu item.
            {
                QColor fill(0,0,0,0);
                // For TintNone, draw a transparent icon, so that menu item's text indent is consistent with the other items.
                if (tint != VuoNode::TintNone)
                {
                    VuoRendererColors colors(tint);
                    fill = colors.nodeFill();
                }
 
                QIcon *icon = VuoInputEditorIcon::renderIcon(^(QPainter &p){
                    p.setPen(Qt::NoPen);
                    p.setBrush(fill);
                    // Match distance between text baseline and ascender.
                    p.drawEllipse(3, 3, 10, 10);
                });
                action->setIcon(*icon);
                delete icon;
            }
 
            contextMenuTintActions.append(action);
        };
        addTintAction(tr("Yellow"),    VuoNode::TintYellow);
        addTintAction(tr("Tangerine"), VuoNode::TintTangerine);
        addTintAction(tr("Orange"),    VuoNode::TintOrange);
        addTintAction(tr("Magenta"),   VuoNode::TintMagenta);
        addTintAction(tr("Violet"),    VuoNode::TintViolet);
        addTintAction(tr("Blue"),      VuoNode::TintBlue);
        addTintAction(tr("Cyan"),      VuoNode::TintCyan);
        addTintAction(tr("Green"),     VuoNode::TintGreen);
        addTintAction(tr("Lime"),      VuoNode::TintLime);
        addTintAction(tr("None"),      VuoNode::TintNone);
    }
 
    // 'Show Events' mode rendering setup
    this->refreshComponentAlphaLevelTimer = new QTimer(this);
    this->refreshComponentAlphaLevelTimer->setObjectName("VuoEditorComposition::refreshComponentAlphaLevelTimer");
    refreshComponentAlphaLevelTimer->setInterval(showEventsModeUpdateInterval);
    connect(refreshComponentAlphaLevelTimer, &QTimer::timeout, this, &VuoEditorComposition::updateGeometryForAllComponents);
    setShowEventsMode(false);
 
    connect(signaler, &VuoRendererSignaler::nodePopoverRequested, this, &VuoEditorComposition::enablePopoverForNode);
    connect(signaler, &VuoRendererSignaler::nodesMoved, this, &VuoEditorComposition::moveNodesBy);
    connect(signaler, &VuoRendererSignaler::commentsMoved, this, &VuoEditorComposition::moveCommentsBy);
    connect(signaler, &VuoRendererSignaler::commentResized, this, &VuoEditorComposition::resizeCommentBy);
    connect(signaler, &VuoRendererSignaler::inputEditorRequested, this, &VuoEditorComposition::inputEditorRequested);
    connect(signaler, &VuoRendererSignaler::nodeTitleEditorRequested, this, &VuoEditorComposition::nodeTitleEditorRequested);
    connect(signaler, &VuoRendererSignaler::commentEditorRequested, this, &VuoEditorComposition::commentEditorRequested);
    connect(signaler, &VuoRendererSignaler::commentZoomRequested, this, &VuoEditorComposition::commentZoomRequested);
    connect(signaler, &VuoRendererSignaler::nodeSourceEditorRequested, this, &VuoEditorComposition::nodeSourceEditorRequested);
    connect(signaler, &VuoRendererSignaler::inputPortCountAdjustmentRequested, this, &VuoEditorComposition::inputPortCountAdjustmentRequested);
    connect(signaler, &VuoRendererSignaler::dragStickinessDisableRequested, this, &VuoEditorComposition::setDisableDragStickiness);
    connect(signaler, &VuoRendererSignaler::openUrl, static_cast<VuoEditor *>(qApp), &VuoEditor::openUrl);
 
    connect(static_cast<VuoEditor *>(qApp), &VuoEditor::activeApplicationStateChanged, this, &VuoEditorComposition::updatePopoversForApplicationStateChange, Qt::QueuedConnection);
    connect(static_cast<VuoEditor *>(qApp), &VuoEditor::focusChanged, this, &VuoEditorComposition::updatePopoversForActiveWindowChange, Qt::QueuedConnection);
    connect(static_cast<VuoEditor *>(qApp), &VuoEditor::applicationWillHide, this, [=]{
        setPopoversHideOnDeactivate(true);
    });
    connect(static_cast<VuoEditor *>(qApp), &VuoEditor::applicationDidUnhide, this, [=]{
        setPopoversHideOnDeactivate(false);
    });
 
    identifierCache = new VuoNodeAndPortIdentifierCache;
    identifierCache->addCompositionComponentsToCache(getBase());
}
 
void VuoEditorComposition::setCompiler(VuoCompiler *compiler)
{
    this->compiler = compiler;
}
 
VuoCompiler *VuoEditorComposition::getCompiler()
{
    return compiler;
}
 
void VuoEditorComposition::setModuleManager(VuoModuleManager *moduleManager)
{
    this->moduleManager = moduleManager;
    moduleManager->setComposition(this);
}
 
VuoModuleManager * VuoEditorComposition::getModuleManager(void)
{
    return moduleManager;
}
 
void VuoEditorComposition::setInputEditorManager(VuoInputEditorManager *inputEditorManager)
{
    this->inputEditorManager = inputEditorManager;
}
 
VuoInputEditorManager * VuoEditorComposition::getInputEditorManager()
{
    return this->inputEditorManager;
}
 
VuoRendererNode * VuoEditorComposition::createNode(QString nodeClassName, string title, double x, double y)
{
    if (compiler)
    {
        VuoCompilerNodeClass *nodeClass = compiler->getNodeClass(nodeClassName.toUtf8().constData());
        if (nodeClass)
        {
            VuoNode *node = createBaseNode(nodeClass, nullptr, title, x, y);
            if (node)
            {
                VuoRendererNode *rn = createRendererNode(node);
                setCustomConstantsForNewNode(rn);
                return rn;
            }
        }
    }
    return NULL;
}
 
VuoNode * VuoEditorComposition::createBaseNode(VuoCompilerNodeClass *nodeClass, VuoNode *modelNode, string title, double x, double y)
{
    // If adding the node would create recursion (subcomposition contains itself), create a node without a compiler detail.
    __block bool isAllowed = true;
    if (nodeClass->isSubcomposition())
    {
        static_cast<VuoEditor *>(qApp)->getSubcompositionRouter()->applyIfInstalledAsSubcomposition(this, ^void (VuoEditorComposition *currComposition, string compositionPath) {
            string compositionModuleKey = VuoCompiler::getModuleKeyForPath(compositionPath);
            bool nodeIsThisComposition = (compositionModuleKey == nodeClass->getBase()->getClassName());
 
            set<string> dependencies = nodeClass->getDependencies();
            auto iter = std::find_if(dependencies.begin(), dependencies.end(), [=](const string &d){ return d == compositionModuleKey; });
            bool nodeContainsThisComposition = (iter != dependencies.end());
 
            isAllowed = ! (nodeIsThisComposition || nodeContainsThisComposition);
        });
    }
 
    VuoNode *node;
    if (isAllowed)
    {
        node = (modelNode ?
                    compiler->createNode(nodeClass, modelNode) :
                    compiler->createNode(nodeClass, title, x, y));
    }
    else
    {
        node = createNodeWithMissingImplementation(nodeClass->getBase(), modelNode, title, x, y);
        node->setForbidden(true);
    }
    return node;
}
 
VuoNode * VuoEditorComposition::createNodeWithMissingImplementation(VuoNodeClass *modelNodeClass, VuoNode *modelNode, string title, double x, double y)
{
    vector<string> inputPortClassNames;
    vector<string> outputPortClassNames;
    foreach (VuoPortClass *portClass, modelNodeClass->getInputPortClasses())
    {
        if (portClass == modelNodeClass->getRefreshPortClass())
            continue;
        inputPortClassNames.push_back(portClass->getName());
    }
    foreach (VuoPortClass *portClass, modelNodeClass->getOutputPortClasses())
        outputPortClassNames.push_back(portClass->getName());
 
    VuoNodeClass *dummyNodeClass = new VuoNodeClass(modelNodeClass->getClassName(), inputPortClassNames, outputPortClassNames);
    return (modelNode ?
                dummyNodeClass->newNode(modelNode) :
                dummyNodeClass->newNode(! title.empty() ? title : modelNodeClass->getDefaultTitle(), x, y));
}
 
void VuoEditorComposition::setCustomConstantsForNewNode(VuoRendererNode *newNode)
{
    // vuo.time.make: Set the 'year' input to the current year.
    if (newNode->getBase()->getNodeClass()->getClassName() == "vuo.time.make")
    {
        VuoPort *yearPort = newNode->getBase()->getInputPortWithName("year");
        if (yearPort)
        {
            QString currentYear = QString::number(QDateTime::currentDateTime().date().year());
            yearPort->getRenderer()->setConstant(VuoText_getString(currentYear.toUtf8().constData()));
        }
    }
}
 
void VuoEditorComposition::addNode(VuoNode *n, bool nodeShouldBeRendered, bool nodeShouldBeGivenUniqueIdentifier)
{
    VuoRendererComposition::addNode(n, nodeShouldBeRendered, nodeShouldBeGivenUniqueIdentifier);
    identifierCache->addNodeToCache(n);
}
 
void VuoEditorComposition::removeNode(VuoRendererNode *rn, bool resetState)
{
    if (resetState)
    {
        disablePortPopovers(rn);
 
        if (getTriggerPortToRefire() && (getTriggerPortToRefire()->getRenderer()->getUnderlyingParentNode() == rn))
            setTriggerPortToRefire(NULL);
    }
 
    VuoRendererComposition::removeNode(rn);
}
 
void VuoEditorComposition::updateNodeImplementationInPlace(VuoRendererNode *oldNode, VuoNode *newNode)
{
    // Inventory the port constants and connected input cables associated with the old node, to be re-associated with the new node.
    map<VuoCable *, VuoPort *> cablesToTransferFromPort;
    map<VuoCable *, VuoPort *> cablesToTransferToPort;
    set<VuoCable *> cablesToRemove;
    getBase()->getCompiler()->getChangesToReplaceNode(oldNode->getBase(), newNode, cablesToTransferFromPort, cablesToTransferToPort, cablesToRemove);
 
    // Also inventory any typecasts collapsed onto the old node, to be attached to the new node instead.
    vector<VuoRendererInputDrawer *> attachedDrawers;
    vector<VuoRendererNode *> collapsedTypecasts;
    vector<VuoPort *> oldInputPorts = oldNode->getBase()->getInputPorts();
    for (vector<VuoPort *>::iterator inputPort = oldInputPorts.begin(); inputPort != oldInputPorts.end(); ++inputPort)
    {
        VuoRendererTypecastPort *typecastPort = dynamic_cast<VuoRendererTypecastPort *>((*inputPort)->getRenderer());
        if (typecastPort)
        {
            VuoRendererNode *typecastNode = typecastPort->getUncollapsedTypecastNode();
            collapsedTypecasts.push_back(typecastNode);
        }
 
        // If the original node is currently being rendered as collapsed typecast, uncollapse it.
        if (oldNode->getProxyCollapsedTypecast())
            uncollapseTypecastNode(oldNode);
 
        // Uncollapse typecasts attached to the original node.
        for (vector<VuoRendererNode *>::iterator i = collapsedTypecasts.begin(); i != collapsedTypecasts.end(); ++i)
            uncollapseTypecastNode(*i);
    }
 
    // Inventory any attachments to the old node, to make sure none are stranded in the replacement.
    for (vector<VuoPort *>::iterator inputPort = oldInputPorts.begin(); inputPort != oldInputPorts.end(); ++inputPort)
    {
        VuoRendererPort *inputPortRenderer = (*inputPort)->getRenderer();
        VuoRendererInputDrawer *attachedDrawer = inputPortRenderer->getAttachedInputDrawer();
        if (attachedDrawer)
            attachedDrawers.push_back(attachedDrawer);
    }
 
    // Perform the node replacement.
    replaceNode(oldNode, newNode);
 
    // Restore connected cables.
    for (map<VuoCable *, VuoPort *>::iterator i = cablesToTransferFromPort.begin(); i != cablesToTransferFromPort.end(); ++i)
        i->first->getRenderer()->setFrom(newNode, i->second);
    for (map<VuoCable *, VuoPort *>::iterator i = cablesToTransferToPort.begin(); i != cablesToTransferToPort.end(); ++i)
        i->first->getRenderer()->setTo(newNode, i->second);
    foreach (VuoCable *cable, cablesToRemove)
        removeCable(cable->getRenderer());
 
    // Restore constant values.
    for (VuoPort *oldInputPort : oldNode->getBase()->getInputPorts())
    {
        VuoPort *newInputPort = newNode->getInputPortWithName(oldInputPort->getClass()->getName());
        if (! newInputPort)
            continue;
 
        if (! oldInputPort->getRenderer()->carriesData() || ! newInputPort->getRenderer()->carriesData())
            continue;
 
        if (oldNode->getBase()->hasCompiler() && newNode->hasCompiler())
        {
            VuoType *oldDataType = static_cast<VuoCompilerPort *>(oldInputPort->getCompiler())->getDataVuoType();
            VuoType *newDataType = static_cast<VuoCompilerPort *>(newInputPort->getCompiler())->getDataVuoType();
            if (! (oldDataType == newDataType && oldDataType && ! dynamic_cast<VuoGenericType *>(oldDataType)) )
                continue;
        }
 
        string oldConstantValue;
        if (oldNode->getBase()->hasCompiler())
            oldConstantValue = oldInputPort->getRenderer()->getConstantAsString();
        else
            oldConstantValue = oldInputPort->getRawInitialValue();
 
        if (newNode->hasCompiler())
            updatePortConstant(static_cast<VuoCompilerPort *>(newInputPort->getCompiler()), oldConstantValue, false);
        else
            newInputPort->setRawInitialValue(oldConstantValue);
    }
 
    // Remove any stranded drawers and their incoming cables.
    // @todo https://b33p.net/kosada/node/16441 and https://b33p.net/kosada/node/16441 :
    // Decide how to handle stranded attachment deletion and insertion properly, including
    // updates to the running composition and all types of incoming connections to the attachments.
    // For now just make sure not to leave behind a stranded drawer or any of its incoming cables.
    foreach (VuoRendererInputDrawer *drawer, attachedDrawers)
    {
        if (!drawer->getRenderedHostPort())
        {
            foreach (VuoRendererPort *drawerPort, drawer->getDrawerPorts())
            {
                VuoRendererTypecastPort *typecastPort = dynamic_cast<VuoRendererTypecastPort *>(drawerPort->getBase()->getRenderer());
                if (typecastPort)
                    uncollapseTypecastNode(typecastPort);
 
                foreach (VuoCable *cable, drawerPort->getBase()->getConnectedCables())
                    removeCable(cable->getRenderer());
            }
 
            removeNode(drawer);
        }
    }
 
    // Restore connected typecasts.
    for (vector<VuoRendererNode *>::iterator i = collapsedTypecasts.begin(); i != collapsedTypecasts.end(); ++i)
        collapseTypecastNode(*i);
 
    // Re-collapse the updated node, if applicable.
    collapseTypecastNode(newNode->getRenderer());
}
 
void VuoEditorComposition::replaceNode(VuoRendererNode *oldNode, VuoNode *newNode)
{
    disablePortPopovers(oldNode);
 
    if (getTriggerPortToRefire() && (getTriggerPortToRefire()->getRenderer()->getUnderlyingParentNode() == oldNode))
        setTriggerPortToRefire(NULL);
 
    newNode->setRawGraphvizDeclaration(oldNode->getBase()->getRawGraphvizDeclaration());
    if (newNode->hasCompiler())
    {
        string graphvizIdentifier = (oldNode->getBase()->hasCompiler() ?
                                         oldNode->getBase()->getCompiler()->getGraphvizIdentifier() :
                                         oldNode->getBase()->getRawGraphvizIdentifier());
        newNode->getCompiler()->setGraphvizIdentifier(graphvizIdentifier);
    }
 
    removeNode(oldNode);
    addNode(newNode, true, false);
 
    identifierCache->addNodeToCache(newNode);
}
 
void VuoEditorComposition::removeCable(VuoRendererCable *rc, bool emitHiddenCableNotification)
{
    bool cableHidden = rc->getBase()->getCompiler()->getHidden();
    VuoRendererComposition::removeCable(rc);
 
    if (cableHidden && emitHiddenCableNotification)
        emit changeInHiddenCables();
}
 
void VuoEditorComposition::addCable(VuoCable *cable, bool emitHiddenCableNotification)
{
    bool cableHidden = cable->getCompiler()->getHidden();
    VuoRendererComposition::addCable(cable);
 
    if (cableHidden && emitHiddenCableNotification)
        emit changeInHiddenCables();
}
 
VuoRendererNode * VuoEditorComposition::createAndConnectMakeListNode(VuoNode *toNode, VuoPort *toPort, VuoRendererCable *&rendererCable)
{
    return VuoRendererComposition::createAndConnectMakeListNode(toNode, toPort, compiler, rendererCable);
}
 
void VuoEditorComposition::createAndConnectDictionaryAttachmentsForNode(VuoNode *node,
                                                                          set<VuoRendererNode *> &createdNodes,
                                                                          set<VuoRendererCable *> &createdCables)
{
    return VuoRendererComposition::createAndConnectDictionaryAttachmentsForNode(node, compiler, createdNodes, createdCables);
}
 
QList<QGraphicsItem *>  VuoEditorComposition::createAndConnectInputAttachments(VuoRendererNode *node, bool createButDoNotAdd)
{
    QList<QGraphicsItem *> addedComponents = VuoRendererComposition::createAndConnectInputAttachments(node, compiler, createButDoNotAdd);
    foreach (QGraphicsItem *component, addedComponents)
    {
        VuoRendererNode *rn = dynamic_cast<VuoRendererNode *>(component);
        if (rn && !createButDoNotAdd)
            identifierCache->addNodeToCache(rn->getBase());
    }
 
    return addedComponents;
}
 
void VuoEditorComposition::modifyComponents(void (^modify)(void))
{
    identifierCache->clearCache();
 
    // Record the IDs of the currently selected components so that the selection status
    // of the corresponding items may be restored after the composition is reset.
    set<string> selectedNodeIDs;
    foreach (VuoRendererNode *rn, getSelectedNodes())
    {
        if (rn->getBase()->hasCompiler())
            selectedNodeIDs.insert(rn->getBase()->getCompiler()->getGraphvizIdentifier());
    }
 
    set<string> selectedCommentIDs;
    foreach (VuoRendererComment *rc, getSelectedComments())
    {
        if (rc->getBase()->hasCompiler())
            selectedCommentIDs.insert(rc->getBase()->getCompiler()->getGraphvizIdentifier());
    }
 
    set<string> selectedCableIDs;
    foreach (VuoRendererCable *rc, getSelectedCables(true))
    {
        if (rc->getBase()->hasCompiler())
            selectedCableIDs.insert(rc->getBase()->getCompiler()->getGraphvizDeclaration());
    }
 
    modify();
 
    // Restore the selection status of pre-existing components.
    foreach (QGraphicsItem *item, items())
    {
        if (dynamic_cast<VuoRendererNode *>(item))
        {
            string currentNodeID = (dynamic_cast<VuoRendererNode *>(item)->getBase()->hasCompiler()?
                                        dynamic_cast<VuoRendererNode *>(item)->getBase()->getCompiler()->getGraphvizIdentifier() :
                                        "");
            if (!currentNodeID.empty() && (selectedNodeIDs.find(currentNodeID) != selectedNodeIDs.end()))
                item->setSelected(true);
        }
 
        if (dynamic_cast<VuoRendererComment *>(item))
        {
            string currentCommentID = (dynamic_cast<VuoRendererComment *>(item)->getBase()->hasCompiler()?
                                        dynamic_cast<VuoRendererComment *>(item)->getBase()->getCompiler()->getGraphvizIdentifier() :
                                        "");
            if (!currentCommentID.empty() && (selectedCommentIDs.find(currentCommentID) != selectedCommentIDs.end()))
                item->setSelected(true);
        }
 
        else if (dynamic_cast<VuoRendererCable *>(item))
        {
            string currentCableID = (dynamic_cast<VuoRendererCable *>(item)->getBase()->hasCompiler()?
                                         dynamic_cast<VuoRendererCable *>(item)->getBase()->getCompiler()->getGraphvizDeclaration() :
                                         "");
            if (!currentCableID.empty() && (selectedCableIDs.find(currentCableID) != selectedCableIDs.end()))
                item->setSelected(true);
        }
    }
 
    // Re-establish mappings between the stored composition components and the running
    // composition components, if applicable.
    identifierCache->addCompositionComponentsToCache(getBase());
 
    // Close popovers for ports no longer present in the composition.
    disableStrandedPortPopovers();
}
 
bool VuoEditorComposition::requiresStructuralChangesAfterValueChangeAtPort(VuoRendererPort *port)
{
    string portName = port->getBase()->getClass()->getName();
    VuoRendererNode *parentNode = port->getRenderedParentNode();
 
    // A changed math expression input to a "Calculate" node will require changes to the node's
    // upstream input lists of variable names and values.
    if ((portName == "expression") &&
            VuoStringUtilities::beginsWith(parentNode->getBase()->getNodeClass()->getClassName(), "vuo.math.calculate"))
        return true;
 
    return false;
}
 
void VuoEditorComposition::deleteSelectedCompositionComponents()
{
    deleteSelectedCompositionComponents("");
}
 
void VuoEditorComposition::deleteSelectedCompositionComponents(string commandDescription)
{
    if (commandDescription.empty())
    {
        if (getContextMenuDeleteSelectedAction()->text().contains("Reset"))
            commandDescription = "Reset";
        else
            commandDescription = "Delete";
    }
 
    QList<QGraphicsItem *> selectedCompositionComponents = selectedItems();
    emit componentsRemoved(selectedCompositionComponents, commandDescription);
}
 
void VuoEditorComposition::deleteSelectedNodes(string commandDescription)
{
    if (commandDescription.empty())
        commandDescription = "Delete";
 
    QList<QGraphicsItem *> selectedNodes;
    foreach (VuoRendererNode *node, getSelectedNodes())
        selectedNodes.append(node);
 
    emit componentsRemoved(selectedNodes, commandDescription);
}
 
void VuoEditorComposition::clear()
{
    identifierCache->clearCache();
 
    uncollapseTypecastNodes();
 
    foreach (VuoCable *cable, getBase()->getCables())
        removeCable(cable->getRenderer(), false);
 
    // @todo: Allow multiple simultaneous active protocols. https://b33p.net/kosada/node/9585
    removeActiveProtocolWithoutModifyingPorts(getActiveProtocol());
 
    foreach (VuoPublishedPort *publishedPort, getBase()->getPublishedOutputPorts())
        removePublishedPort(publishedPort, false);
 
    foreach (VuoPublishedPort *publishedPort, getBase()->getPublishedInputPorts())
        removePublishedPort(publishedPort, true);
 
    foreach (VuoNode *node, getBase()->getNodes())
        removeNode(node->getRenderer(), false);
 
    getBase()->getCompiler()->clearGraphvizNodeIdentifierHistory();
 
    foreach (VuoComment *comment, getBase()->getComments())
        removeComment(comment->getRenderer());
 
    getBase()->getCompiler()->clearGraphvizCommentIdentifierHistory();
}
 
void VuoEditorComposition::insertNode()
{
    QAction *sender = (QAction *)QObject::sender();
    QPair<QPointF, QString> pair = sender->data().value<QPair<QPointF, QString> >();
 
    QList<QGraphicsItem *> newNodes;
    VuoRendererNode *newNode = createNode(pair.second, "",
                                          pair.first.x(),
                                          pair.first.y());
 
    if (newNode)
    {
        newNodes.append(newNode);
        emit componentsAdded(newNodes, this);
    }
}
 
void VuoEditorComposition::insertComment()
{
    QAction *sender = (QAction *)QObject::sender();
    QPointF scenePos = sender->data().value<QPointF>();
 
    emit commentInsertionRequested(scenePos);
}
 
void VuoEditorComposition::insertSubcomposition()
{
    QAction *sender = (QAction *)QObject::sender();
    QPointF scenePos = sender->data().value<QPointF>();
 
    emit subcompositionInsertionRequested(scenePos);
}
 
void VuoEditorComposition::togglePortPublicationStatus()
{
    QAction *sender = (QAction *)QObject::sender();
    VuoRendererPort *port = (VuoRendererPort *)(sender->data().value<void *>());
 
    if (isPortPublished(port))
        emit portUnpublicationRequested(port->getBase());
    else
        emit portPublicationRequested(port->getBase(), false);
}
 
void VuoEditorComposition::deleteConnectedCables()
{
    QAction *sender = (QAction *)QObject::sender();
    VuoRendererPort *port = (VuoRendererPort *)(sender->data().value<void *>());
    vector<VuoCable *> connectedCables = port->getBase()->getConnectedCables(true);
    QList<QGraphicsItem *> cablesToRemove;
 
    // Delete visible directly connected cables.
    foreach (VuoCable *cable, port->getBase()->getConnectedCables(true))
    {
        if (!cable->getRenderer()->paintingDisabled())
            cablesToRemove.append(cable->getRenderer());
    }
 
    // Delete visible cables connected to the typecast's child port.
    VuoRendererTypecastPort *typecastPort = dynamic_cast<VuoRendererTypecastPort *>(port);
    if (typecastPort)
    {
        VuoRendererNode *typecastNode = typecastPort->getUncollapsedTypecastNode();
        VuoPort *typecastInPort = typecastNode->getBase()->getInputPorts()[VuoNodeClass::unreservedInputPortStartIndex];
        foreach(VuoCable *cable, typecastInPort->getConnectedCables(true))
        {
            if (!cable->getRenderer()->paintingDisabled())
                cablesToRemove.append(cable->getRenderer());
        }
    }
 
    emit componentsRemoved(QList<QGraphicsItem *>(cablesToRemove));
}
 
void VuoEditorComposition::hideConnectedCables()
{
    QAction *sender = (QAction *)QObject::sender();
    VuoRendererPort *port = (VuoRendererPort *)(sender->data().value<void *>());
    set<VuoRendererCable *> cablesToHide;
 
    // Hide visible directly connected cables.
    foreach (VuoCable *cable, port->getBase()->getConnectedCables(false))
    {
        if (!cable->getRenderer()->paintingDisabled() && !cable->getCompiler()->getHidden())
            cablesToHide.insert(cable->getRenderer());
    }
 
    // Hide visible cables connected to the typecast's child port.
    VuoRendererTypecastPort *typecastPort = dynamic_cast<VuoRendererTypecastPort *>(port);
    if (typecastPort)
    {
        VuoRendererNode *typecastNode = typecastPort->getUncollapsedTypecastNode();
        VuoPort *typecastInPort = typecastNode->getBase()->getInputPorts()[VuoNodeClass::unreservedInputPortStartIndex];
        foreach (VuoCable *cable, typecastInPort->getConnectedCables(false))
        {
            if (!cable->getRenderer()->paintingDisabled() && !cable->getCompiler()->getHidden())
                cablesToHide.insert(cable->getRenderer());
        }
    }
 
    emit cablesHidden(cablesToHide);
}
 
void VuoEditorComposition::unhideConnectedCables()
{
    QAction *sender = (QAction *)QObject::sender();
    VuoRendererPort *port = (VuoRendererPort *)(sender->data().value<void *>());
    set<VuoRendererCable *> cablesToUnhide;
 
    // Unhide visible directly connected cables.
    foreach (VuoCable *cable, port->getBase()->getConnectedCables(true))
    {
        if (cable->getRenderer()->getEffectivelyWireless())
            cablesToUnhide.insert(cable->getRenderer());
    }
 
    // Unhide visible cables connected to the typecast's child port.
    VuoRendererTypecastPort *typecastPort = dynamic_cast<VuoRendererTypecastPort *>(port);
    if (typecastPort)
    {
        VuoRendererNode *typecastNode = typecastPort->getUncollapsedTypecastNode();
        VuoPort *typecastInPort = typecastNode->getBase()->getInputPorts()[VuoNodeClass::unreservedInputPortStartIndex];
        foreach (VuoCable *cable, typecastInPort->getConnectedCables(true))
        {
            if (cable->getRenderer()->getEffectivelyWireless())
                cablesToUnhide.insert(cable->getRenderer());
        }
    }
 
    emit cablesUnhidden(cablesToUnhide);
}
 
void VuoEditorComposition::fireTriggerPortEvent()
{
    QAction *sender = (QAction *)QObject::sender();
    VuoRendererPort *port = (VuoRendererPort *)(sender->data().value<void *>());
    fireTriggerPortEvent(port->getBase());
}
 
void VuoEditorComposition::refireTriggerPortEvent()
{
    fireTriggerPortEvent(getTriggerPortToRefire());
}
 
VuoPort * VuoEditorComposition::getTriggerPortToRefire()
{
    if (triggerPortToRefire.empty())
        return nullptr;
 
    VuoPort *triggerPort = nullptr;
    identifierCache->doForPortWithIdentifier(triggerPortToRefire, [&triggerPort](VuoPort *port) {
        triggerPort = port;
    });
    return triggerPort;
}
 
void VuoEditorComposition::setTriggerPortToRefire(VuoPort *port)
{
    string portID = getIdentifierForStaticPort(port);
    if (portID != this->triggerPortToRefire)
    {
        this->triggerPortToRefire = portID;
        emit refirePortChanged();
    }
}
 
void VuoEditorComposition::setPortConstant()
{
    QAction *sender = (QAction *)QObject::sender();
    VuoRendererPort *port = (VuoRendererPort *)(sender->data().value<void *>());
 
    if (port->isConstant())
        emit inputEditorRequested(port);
}
 
void VuoEditorComposition::setPortConstantToValue(VuoRendererPort *port, string value)
{
    if (port->isConstant())
        emit portConstantChangeRequested(port, value);
}
 
void VuoEditorComposition::specializeGenericPortType()
{
    QAction *sender = (QAction *)QObject::sender();
    QList<QVariant> portAndSpecializedType= sender->data().toList();
    VuoRendererPort *port = (VuoRendererPort *)portAndSpecializedType[0].value<void *>();
    QString specializedTypeName = portAndSpecializedType[1].toString();
 
    // If the port is already specialized to the target type, do nothing.
    if (port && (port->getDataType()->getModuleKey() == specializedTypeName.toUtf8().constData()))
        return;
 
    // If the port is already specialized to a different type, re-specialize it.
    if (port && !dynamic_cast<VuoGenericType *>(port->getDataType()))
        emit respecializePort(port, specializedTypeName.toUtf8().constData());
 
    // Otherwise, specialize the port from generic.
    else
        emit specializePort(port, specializedTypeName.toUtf8().constData());
}
 
void VuoEditorComposition::unspecializePortType()
{
    QAction *sender = (QAction *)QObject::sender();
    VuoRendererPort *port = (VuoRendererPort *)(sender->data().value<void *>());
 
    // If the port is already generic, do nothing.
    if (port && dynamic_cast<VuoGenericType *>(port->getDataType()))
        return;
 
    emit unspecializePort(port);
}
 
void VuoEditorComposition::createReplacementsToUnspecializePort(VuoPort *portToUnspecialize, bool shouldOutputNodesToReplace, map<VuoNode *, string> &nodesToReplace, set<VuoCable *> &cablesToDelete)
{
    // Find the ports that will share the same generic type as portToUnspecialize, and organize them by node.
    set<VuoPort *> connectedPotentiallyGenericPorts = getBase()->getCompiler()->getCorrelatedGenericPorts(portToUnspecialize->getRenderer()->getUnderlyingParentNode()->getBase(),
                                                                                                          portToUnspecialize, true);
    map<VuoNode *, set<VuoPort *> > portsToUnspecializeForNode;
    for (VuoPort *connectedPort : connectedPotentiallyGenericPorts)
    {
        VuoNode *node = connectedPort->getRenderer()->getUnderlyingParentNode()->getBase();
 
        // @todo: Don't just exclude ports that aren't currently revertible, also exclude ports that are only
        // within the current network by way of ports that aren't currently revertible.
        if (isPortCurrentlyRevertible(connectedPort->getRenderer()))
            portsToUnspecializeForNode[node].insert(connectedPort);
    }
 
    for (map<VuoNode *, set<VuoPort *> >::iterator i = portsToUnspecializeForNode.begin(); i != portsToUnspecializeForNode.end(); ++i)
    {
        VuoNode *node = i->first;
        set<VuoPort *> ports = i->second;
 
        if (shouldOutputNodesToReplace)
        {
            // Create the unspecialized node class name for each node to unspecialize.
            set<VuoPortClass *> portClasses;
            for (set<VuoPort *>::iterator j = ports.begin(); j != ports.end(); ++j)
                portClasses.insert((*j)->getClass());
            VuoCompilerSpecializedNodeClass *nodeClass = static_cast<VuoCompilerSpecializedNodeClass *>(node->getNodeClass()->getCompiler());
            string unspecializedNodeClassName = nodeClass->createUnspecializedNodeClassName(portClasses);
            nodesToReplace[node] = unspecializedNodeClassName;
        }
 
        // Identify the cables that will become invalid (data-carrying cable with generic port at one end, non-generic port at the other end)
        // when the node is unspecialized.
        for (set<VuoPort *>::iterator j = ports.begin(); j != ports.end(); ++j)
        {
            VuoPort *port = *j;
            for (VuoCable *cable : port->getConnectedCables(true))
            {
                bool areEndsCompatible = false;
 
                if (!cable->getRenderer()->effectivelyCarriesData())
                    areEndsCompatible = true;
 
                else if (! cable->isPublished())
                {
                    VuoPort *portOnOtherEnd = (cable->getFromPort() == port ? cable->getToPort() : cable->getFromPort());
                    if (portOnOtherEnd && isPortCurrentlyRevertible(portOnOtherEnd->getRenderer()))
                    {
                        VuoNode *nodeOnOtherEnd = portOnOtherEnd->getRenderer()->getUnderlyingParentNode()->getBase();
                        VuoCompilerNodeClass *nodeClassOnOtherEnd = nodeOnOtherEnd->getNodeClass()->getCompiler();
                        VuoCompilerSpecializedNodeClass *specializedNodeClassOnOtherEnd = dynamic_cast<VuoCompilerSpecializedNodeClass *>(nodeClassOnOtherEnd);
                        if (specializedNodeClassOnOtherEnd)
                        {
                            VuoType *typeOnOtherEnd = specializedNodeClassOnOtherEnd->getOriginalPortType( portOnOtherEnd->getClass() );
                            if (! typeOnOtherEnd || dynamic_cast<VuoGenericType *>(typeOnOtherEnd))
                                areEndsCompatible = true;
                        }
                    }
                }
 
                if (! areEndsCompatible && (cable != cableInProgress))
                    cablesToDelete.insert(cable);
            }
        }
    }
}
 
void VuoEditorComposition::fireTriggerPortEvent(VuoPort *port)
{
    if (! (port && port->hasCompiler()) )
        return;
 
    VuoPort *oldManuallyFirableInputPort = getBase()->getCompiler()->getManuallyFirableInputPort();
    string oldSnapshot = takeSnapshot();
 
    string runningTriggerPortIdentifier = "";
    bool isTriggerPort = false;
    if (dynamic_cast<VuoCompilerTriggerPort *>(port->getCompiler()))
    {
        // Trigger port — The event will be fired from the port.
 
        getBase()->getCompiler()->setManuallyFirableInputPort(nullptr, nullptr);
 
        runningTriggerPortIdentifier = identifierCache->getIdentifierForPort(port);
        isTriggerPort = true;
    }
    else if (port->hasRenderer() && port->getRenderer()->getInput())
    {
        // Input port — The event will be fired from the composition's manually firable trigger into the port.
 
        getBase()->getCompiler()->setManuallyFirableInputPort(port->getRenderer()->getUnderlyingParentNode()->getBase(), port);
 
        VuoCompilerGraph *graph = getBase()->getCompiler()->getCachedGraph();
        VuoCompilerTriggerPort *triggerPort = graph->getManuallyFirableTrigger();
        VuoCompilerNode *triggerNode = graph->getNodeForTriggerPort(triggerPort);
        runningTriggerPortIdentifier = getIdentifierForStaticPort(triggerPort->getBase(), triggerNode->getBase());
    }
    else
        return;
 
    VUserLog("%s:      Fire %s",
        window->getWindowTitleWithoutPlaceholder().toUtf8().data(),
        runningTriggerPortIdentifier.c_str());
 
    VuoPort *newManuallyFirableInputPort = getBase()->getCompiler()->getManuallyFirableInputPort();
    bool manuallyFirableInputPortChanged = (oldManuallyFirableInputPort != newManuallyFirableInputPort);
    string newSnapshot = takeSnapshot();
 
    auto fireIfRunning = ^void (VuoEditorComposition *topLevelComposition, string thisCompositionIdentifier)
    {
        dispatch_async(topLevelComposition->runCompositionQueue, ^{
            if (topLevelComposition->isRunningThreadUnsafe())
            {
                topLevelComposition->runner->fireTriggerPortEvent(thisCompositionIdentifier, runningTriggerPortIdentifier);
 
                // Display the trigger port animation when the user manually fires an event
                // even if not in "Show Events" mode.  (If in "Show Events" mode, this will
                // be handled for trigger ports by VuoEditorComposition::receivedTelemetryOutputPortUpdated(...).)
                if (! (this->showEventsMode && isTriggerPort) )
                    this->animatePort(port->getRenderer());
            }
        });
    };
 
    static_cast<VuoEditor *>(qApp)->getSubcompositionRouter()->applyToLinkedTopLevelComposition(this, ^void (VuoEditorComposition *topLevelComposition, string thisCompositionIdentifier) {
        if (this == topLevelComposition || ! manuallyFirableInputPortChanged)
        {
            // Top-level composition or unmodified subcomposition — Fire the trigger immediately.
 
            if (! newSnapshot.empty() && manuallyFirableInputPortChanged)
                updateRunningComposition(oldSnapshot, newSnapshot);
 
            fireIfRunning(topLevelComposition, thisCompositionIdentifier);
        }
        else
        {
            // Modified subcomposition — Fire the trigger after the subcomposition has been reloaded.
 
            static_cast<VuoEditor *>(qApp)->getSubcompositionRouter()->applyIfInstalledAsSubcomposition(this, ^void (VuoEditorComposition *currComposition, string compositionPath) {
                string nodeClassName = VuoCompiler::getModuleKeyForPath(compositionPath);
                moduleManager->doNextTimeNodeClassIsLoaded(nodeClassName, ^{
                    static_cast<VuoEditor *>(qApp)->getSubcompositionRouter()->applyToLinkedTopLevelComposition(this, ^void (VuoEditorComposition *topLevelComposition, string thisCompositionIdentifier) {
                        fireIfRunning(topLevelComposition, thisCompositionIdentifier);
                    });
                });
 
                if (! newSnapshot.empty())
                    updateRunningComposition(oldSnapshot, newSnapshot);
            });
        }
    });
 
    setTriggerPortToRefire(port);
}
 
void VuoEditorComposition::addInputPort()
{
    QAction *sender = (QAction *)QObject::sender();
    VuoRendererNode *node = (VuoRendererNode *)(sender->data().value<void *>());
    emit inputPortCountAdjustmentRequested(node, 1, false);
}
 
void VuoEditorComposition::removeInputPort()
{
    QAction *sender = (QAction *)QObject::sender();
    VuoRendererNode *node = (VuoRendererNode *)(sender->data().value<void *>());
    emit inputPortCountAdjustmentRequested(node, -1, false);
}
 
void VuoEditorComposition::swapNode()
{
    QAction *sender = (QAction *)QObject::sender();
    QList<QVariant> nodeAndReplacementType= sender->data().toList();
    VuoRendererNode *node = static_cast<VuoRendererNode *>(nodeAndReplacementType[0].value<void *>());
    QString newNodeClassName = nodeAndReplacementType[1].toString();
    emit nodeSwapRequested(node, newNodeClassName.toUtf8().constData());
}
 
void VuoEditorComposition::renameSelectedNodes()
{
    // Open a title editor for each selected non-attachment node.
    set<VuoRendererNode *> selectedNodes = getSelectedNodes();
    for (set<VuoRendererNode *>::iterator i = selectedNodes.begin(); i != selectedNodes.end(); ++i)
    {
        if (!dynamic_cast<VuoRendererInputAttachment *>(*i))
            emit nodeTitleEditorRequested(*i);
    }
}
 
void VuoEditorComposition::editSelectedComments()
{
    // Open a text editor for each selected comment.
    set<VuoRendererComment *> selectedComments = getSelectedComments();
    for (set<VuoRendererComment *>::iterator i = selectedComments.begin(); i != selectedComments.end(); ++i)
        emit commentEditorRequested(*i);
}
 
set<VuoRendererCable *> VuoEditorComposition::getCablesInternalToSubcomposition(QList<QGraphicsItem *> subcompositionComponents)
{
    set<VuoRendererCable *> internalCables;
 
    for (QList<QGraphicsItem *>::iterator i = subcompositionComponents.begin(); i != subcompositionComponents.end(); ++i)
    {
        QGraphicsItem *compositionComponent = *i;
        VuoRendererNode *rn = dynamic_cast<VuoRendererNode *>(compositionComponent);
        if (rn)
        {
            set<VuoCable *> connectedCables = rn->getConnectedCables(false);
            for (set<VuoCable *>::iterator cable = connectedCables.begin(); cable != connectedCables.end(); ++cable)
            {
                VuoNode *fromNode = (*cable)->getFromNode();
                VuoNode *toNode = (*cable)->getToNode();
 
                if (fromNode && toNode && subcompositionComponents.contains(fromNode->getRenderer()) && subcompositionComponents.contains(toNode->getRenderer()))
                    internalCables.insert((*cable)->getRenderer());
            }
        }
    }
 
    return internalCables;
}
 
VuoCable * VuoEditorComposition::getCableInProgress()
{
    return cableInProgress;
}
 
bool VuoEditorComposition::getCableInProgressWasNew()
{
    return cableInProgressWasNew;
}
 
bool VuoEditorComposition::getMenuSelectionInProgress()
{
    return menuSelectionInProgress;
}
 
void VuoEditorComposition::selectAllCompositionComponents()
{
    QList<QGraphicsItem *> compositionComponents = items();
    for (QList<QGraphicsItem *>::iterator i = compositionComponents.begin(); i != compositionComponents.end(); ++i)
    {
        QGraphicsItem *compositionComponent = *i;
 
        VuoRendererCable *rc = dynamic_cast<VuoRendererCable *>(compositionComponent);
        if (!rc || !rc->paintingDisabled())
            compositionComponent->setSelected(true);
    }
}
 
void VuoEditorComposition::selectAllComments()
{
    QList<QGraphicsItem *> compositionComponents = items();
    for (QList<QGraphicsItem *>::iterator i = compositionComponents.begin(); i != compositionComponents.end(); ++i)
    {
        QGraphicsItem *compositionComponent = *i;
        VuoRendererComment *rcomment = dynamic_cast<VuoRendererComment *>(compositionComponent);
        if (rcomment)
            rcomment->setSelected(true);
    }
}
 
void VuoEditorComposition::deselectAllCompositionComponents()
{
    QList<QGraphicsItem *> compositionComponents = items();
    for (QList<QGraphicsItem *>::iterator i = compositionComponents.begin(); i != compositionComponents.end(); ++i)
    {
        QGraphicsItem *compositionComponent = *i;
        compositionComponent->setSelected(false);
    }
}
 
void VuoEditorComposition::openSelectedEditableNodes()
{
    foreach (VuoRendererNode *node, getSelectedNodes())
    {
        VuoNodeClass *nodeClass = node->getBase()->getNodeClass();
        QString actionText, sourcePath;
        if (VuoEditorUtilities::isNodeClassEditable(nodeClass, actionText, sourcePath))
            emit nodeSourceEditorRequested(node);
    }
}
 
void VuoEditorComposition::moveSelectedItemsBy(qreal dx, qreal dy)
{
    set<VuoRendererNode *> selectedNodes = getSelectedNodes();
    set<VuoRendererComment *> selectedComments = getSelectedComments();
    moveItemsBy(selectedNodes, selectedComments, dx, dy, false);
}
 
void VuoEditorComposition::moveNodesBy(set<VuoRendererNode *> nodes, qreal dx, qreal dy, bool movedByDragging)
{
    set<VuoRendererComment *> comments;
    moveItemsBy(nodes, comments, dx, dy, movedByDragging);
}
 
void VuoEditorComposition::moveCommentsBy(set<VuoRendererComment *> comments, qreal dx, qreal dy, bool movedByDragging)
{
    set<VuoRendererNode *> nodes;
    moveItemsBy(nodes, comments, dx, dy, movedByDragging);
}
 
void VuoEditorComposition::moveItemsBy(set<VuoRendererNode *> nodes, set<VuoRendererComment *> comments, qreal dx, qreal dy, bool movedByDragging)
{
    emit itemsMoved(nodes, comments, dx, dy, movedByDragging);
    repaintFeedbackErrorMarks();
    for (set<VuoRendererNode *>::iterator it = nodes.begin(); it != nodes.end(); ++it)
        (*it)->updateConnectedCableGeometry();
}
 
void VuoEditorComposition::resizeCommentBy(VuoRendererComment *comment, qreal dx, qreal dy)
{
    emit commentResized(comment, dx, dy);
}
 
set<VuoRendererNode *> VuoEditorComposition::getSelectedNodes()
{
    QList<QGraphicsItem *> selectedCompositionComponents = selectedItems();
    set<VuoRendererNode *> selectedNodes;
    for (QList<QGraphicsItem *>::iterator i = selectedCompositionComponents.begin(); i != selectedCompositionComponents.end(); ++i)
    {
        QGraphicsItem *compositionComponent = *i;
        VuoRendererNode *rn = dynamic_cast<VuoRendererNode *>(compositionComponent);
        if (rn)
            selectedNodes.insert(rn);
    }
 
    return selectedNodes;
}
 
set<VuoRendererComment *> VuoEditorComposition::getSelectedComments()
{
    QList<QGraphicsItem *> selectedCompositionComponents = selectedItems();
    set<VuoRendererComment *> selectedComments;
    for (QList<QGraphicsItem *>::iterator i = selectedCompositionComponents.begin(); i != selectedCompositionComponents.end(); ++i)
    {
        QGraphicsItem *compositionComponent = *i;
        VuoRendererComment *rc = dynamic_cast<VuoRendererComment *>(compositionComponent);
        if (rc)
            selectedComments.insert(rc);
    }
 
    return selectedComments;
}
 
set<VuoRendererCable *> VuoEditorComposition::getSelectedCables(bool includePublishedCables)
{
    QList<QGraphicsItem *> selectedCompositionComponents = selectedItems();
    set<VuoRendererCable *> selectedCables;
    for (QList<QGraphicsItem *>::iterator i = selectedCompositionComponents.begin(); i != selectedCompositionComponents.end(); ++i)
    {
        QGraphicsItem *compositionComponent = *i;
        VuoRendererCable *rc = dynamic_cast<VuoRendererCable *>(compositionComponent);
        if (rc && (includePublishedCables || !rc->getBase()->isPublished()))
            selectedCables.insert(rc);
    }
 
    return selectedCables;
}
 
void VuoEditorComposition::dragEnterEvent(QGraphicsSceneDragDropEvent *event)
{
    const QMimeData *mimeData = event->mimeData();
    bool disablePortHoverHighlighting = true;
 
    // Accept drags of files.
    if (mimeData->hasFormat("text/uri-list"))
    {
        QList<QUrl> urls = mimeData->urls();
 
        QGraphicsItem *nearbyItem = findNearbyComponent(event->scenePos());
        VuoRendererPort *portAtDropLocation = dynamic_cast<VuoRendererPort *>(nearbyItem);
        if (portAtDropLocation)
        {
            if ((urls.size() == 1) && portAtDropLocation->isConstant() &&
                    (portAtDropLocation->getDataType()->getModuleKey() == "VuoText"))
                disablePortHoverHighlighting = false;
            else
                event->setDropAction(Qt::IgnoreAction);
        }
        else // if (!portAtDropLocation)
        {
            bool dragIncludesDroppableFile = false;
            foreach (QUrl url, urls)
            {
                char *urlZ = strdup(url.path().toUtf8().constData());
                bool isSupportedDragNDropFile =
                    VuoFileType_isFileOfType(urlZ, VuoFileType_Image)
                 || VuoFileType_isFileOfType(urlZ, VuoFileType_Movie)
                 || VuoFileType_isFileOfType(urlZ, VuoFileType_Scene)
                 || VuoFileType_isFileOfType(urlZ, VuoFileType_Audio)
                 || VuoFileType_isFileOfType(urlZ, VuoFileType_Feed)
                 || VuoFileType_isFileOfType(urlZ, VuoFileType_JSON)
                 || VuoFileType_isFileOfType(urlZ, VuoFileType_XML)
                 || VuoFileType_isFileOfType(urlZ, VuoFileType_Table)
                 || VuoFileType_isFileOfType(urlZ, VuoFileType_Mesh)
                 || VuoFileType_isFileOfType(urlZ, VuoFileType_Data)
                 || VuoFileType_isFileOfType(urlZ, VuoFileType_App)
                 || isDirectory(urlZ);
                free(urlZ);
                if (isSupportedDragNDropFile)
                {
                    dragIncludesDroppableFile = true;
                    break;
                }
            }
 
            if (!dragIncludesDroppableFile)
                event->setDropAction(Qt::IgnoreAction);
        }
 
        event->accept();
    }
 
    // Accept drags of single or multiple nodes from the node library.
    else if (mimeData->hasFormat("text/plain") || mimeData->hasFormat("text/scsv"))
        event->acceptProposedAction();
 
    else
    {
        event->setDropAction(Qt::IgnoreAction);
        event->accept();
    }
 
    updateHoverHighlighting(event->scenePos(), disablePortHoverHighlighting);
}
 
void VuoEditorComposition::dragLeaveEvent(QGraphicsSceneDragDropEvent *event)
{
    event->acceptProposedAction();
}
 
void VuoEditorComposition::dragMoveEvent(QGraphicsSceneDragDropEvent *event)
{
    dragEnterEvent(event);
}
 
void VuoEditorComposition::dropEvent(QGraphicsSceneDragDropEvent *event)
{
    const QMimeData *mimeData = event->mimeData();
 
    // Accept drops of certain types of files.
    if (mimeData->hasFormat("text/uri-list"))
    {
        // Retrieve the composition directory so that file paths may be specified relative to it.
        // Note: Providing the directory's canonical path as the argument to the
        // QDir constructor is necessary in order for QDir::relativeFilePath() to
        // work correctly when the non-canonical path contains symbolic links (e.g.,
        // '/tmp' -> '/private/tmp' for example compositions).
        string topCompositionPath = compiler->getCompositionLocalPath();
        if (topCompositionPath.empty())
            topCompositionPath = getBase()->getDirectory();
        QDir compositionDir(QDir(topCompositionPath.c_str()).canonicalPath());
 
        // Use the absolute file path if the "Option" key was pressed.
        bool useAbsoluteFilePaths = VuoEditorUtilities::optionKeyPressedForEvent(event);
 
        QList<QGraphicsItem *> newNodes;
        QList<QUrl> urls = mimeData->urls();
 
        QGraphicsItem *nearbyItem = findNearbyComponent(event->scenePos());
        VuoRendererPort *portAtDropLocation = dynamic_cast<VuoRendererPort *>(nearbyItem);
        if (portAtDropLocation)
        {
            if ((urls.size() == 1) && portAtDropLocation->isConstant() &&
                    (portAtDropLocation->getDataType()->getModuleKey() == "VuoText"))
            {
                QString filePath = (useAbsoluteFilePaths? urls[0].path() : compositionDir.relativeFilePath(urls[0].path()));
                string constantValue = "\"" + string(filePath.toUtf8().constData()) + "\"";
                event->accept();
 
                emit portConstantChangeRequested(portAtDropLocation, constantValue);
            }
            else
                event->ignore();
        }
 
        else // if (!portAtDropLocation)
        {
            const int ySpacingForNewNodes = 11;
            int yOffsetForPreviousNewNode = -1 * ySpacingForNewNodes;
 
            foreach (QUrl url, urls)
            {
                QStringList targetNodeClassNames;
                char *urlZ = strdup(url.path().toUtf8().constData());
 
                if (VuoFileType_isFileOfType(urlZ, VuoFileType_Image))
                    targetNodeClassNames += "vuo.image.fetch";
                if (VuoFileType_isFileOfType(urlZ, VuoFileType_Movie))
                {
                    if (!getActiveProtocol())
                        targetNodeClassNames += "vuo.video.play";
 
                    targetNodeClassNames += "vuo.video.decodeImage";
                }
                if (VuoFileType_isFileOfType(urlZ, VuoFileType_Scene))
                    targetNodeClassNames += "vuo.scene.fetch";
                if (VuoFileType_isFileOfType(urlZ, VuoFileType_Audio))
                    targetNodeClassNames += "vuo.audio.file.play";
                if (VuoFileType_isFileOfType(urlZ, VuoFileType_Mesh))
                    targetNodeClassNames += "vuo.image.project.dome";
                if (VuoFileType_isFileOfType(urlZ, VuoFileType_Feed))
                    targetNodeClassNames += "vuo.rss.fetch";
                if (VuoFileType_isFileOfType(urlZ, VuoFileType_JSON))
                    targetNodeClassNames += "vuo.tree.fetch.json";
                if (VuoFileType_isFileOfType(urlZ, VuoFileType_XML))
                    targetNodeClassNames += "vuo.tree.fetch.xml";
                if (VuoFileType_isFileOfType(urlZ, VuoFileType_Table))
                    targetNodeClassNames += "vuo.table.fetch";
                if (VuoFileType_isFileOfType(urlZ, VuoFileType_Data))
                    targetNodeClassNames += "vuo.data.fetch";
                if (VuoFileType_isFileOfType(urlZ, VuoFileType_App))
                    targetNodeClassNames += "vuo.app.launch";
                if (isDirectory(urlZ))
                    targetNodeClassNames += "vuo.file.list";
 
                free(urlZ);
 
                QString selectedNodeClassName = "";
                if (targetNodeClassNames.size() == 1)
                    selectedNodeClassName = targetNodeClassNames[0];
                else if (targetNodeClassNames.size() > 1)
                {
                    QMenu nodeMenu(views()[0]->viewport());
                    nodeMenu.setSeparatorsCollapsible(false); 
 
                    foreach (QString nodeClassName, targetNodeClassNames)
                    {
                        VuoCompilerNodeClass *nodeClass = compiler->getNodeClass(nodeClassName.toUtf8().constData());
                        string nodeTitle = (nodeClass? nodeClass->getBase()->getDefaultTitle() : nodeClassName.toUtf8().constData());
                        //: Appears in a popup menu when dragging files from Finder onto the composition canvas.
                        QAction *nodeAction = nodeMenu.addAction(tr("Insert \"%1\" Node").arg(nodeTitle.c_str()));
                        nodeAction->setData(nodeClassName);
                    }
 
                    menuSelectionInProgress = true;
                    QAction *selectedNode = nodeMenu.exec(QCursor::pos());
                    menuSelectionInProgress = false;
 
                    selectedNodeClassName = (selectedNode? selectedNode->data().toString().toUtf8().constData() : "");
                }
 
                if (!selectedNodeClassName.isEmpty())
                {
                    VuoRendererNode *newNode = createNode(selectedNodeClassName, "",
                                                          event->scenePos().x(),
                                                          event->scenePos().y() + yOffsetForPreviousNewNode + ySpacingForNewNodes);
 
                    if (newNode)
                    {
                        VuoPort *urlPort = newNode->getBase()->getInputPortWithName(selectedNodeClassName == "vuo.file.list"?
                                                                                        "folder" :
                                                                                        "url");
                        if (urlPort)
                        {
                            QString filePath = (useAbsoluteFilePaths? url.path() : compositionDir.relativeFilePath(url.path()));
                            urlPort->getRenderer()->setConstant(VuoText_getString(filePath.toUtf8().constData()));
 
                            newNodes.append(newNode);
 
                            yOffsetForPreviousNewNode += newNode->boundingRect().height();
                            yOffsetForPreviousNewNode += ySpacingForNewNodes;
                        }
                    }
                }
            }
 
            if (newNodes.size() > 0)
            {
                event->accept();
 
                emit componentsAdded(newNodes, this);
            }
            else
                event->ignore();
        }
    }
 
    // Accept drops of one or more nodes from the node library class list.
    else if (mimeData->hasFormat("text/scsv"))
    {
        event->setDropAction(Qt::CopyAction);
        event->accept();
 
        QByteArray scsvData = event->mimeData()->data("text/scsv");
        QString scsvText = QString::fromUtf8(scsvData);
        QStringList nodeClassNames = scsvText.split(';');
 
        QPointF startPos = event->scenePos()-QPointF(0,VuoRendererNode::nodeHeaderYOffset);
        int nextYPos = VuoRendererComposition::quantizeToNearestGridLine(startPos,
                                                                         VuoRendererComposition::minorGridLineSpacing).y();
        int snapDelta = nextYPos - startPos.y();
 
        QList<QGraphicsItem *> newNodes;
        for (QStringList::iterator i = nodeClassNames.begin(); i != nodeClassNames.end(); ++i)
        {
            VuoRendererNode *newNode = createNode(*i, "",
                        startPos.x(),
                        nextYPos - (VuoRendererItem::getSnapToGrid()? 0 : snapDelta));
 
            if (newNode)
            {
                int prevYPos = nextYPos;
                nextYPos = VuoRendererComposition::quantizeToNearestGridLine(QPointF(0,prevYPos+newNode->boundingRect().height()),
                                                                             VuoRendererComposition::minorGridLineSpacing).y();
                if (nextYPos <= prevYPos+newNode->boundingRect().height())
                    nextYPos += VuoRendererComposition::minorGridLineSpacing;
 
                newNodes.append((QGraphicsItem *)newNode);
            }
        }
 
        emit componentsAdded(newNodes, this);
    }
 
    // Accept drops of single nodes from the node library documentation panel.
    else if (mimeData->hasFormat("text/plain"))
    {
        event->setDropAction(Qt::CopyAction);
        event->accept();
 
        QList<QGraphicsItem *> newNodes;
        QStringList dropItems = event->mimeData()->text().split('\n');
        QString nodeClassName = dropItems[0];
 
        // Account for the offset between cursor and dragged item pixmaps
        // to drop node in-place.
        QPoint hotSpot = (dropItems.size() >= 3? QPoint(dropItems[1].toInt(), dropItems[2].toInt()) : QPoint(0,0));
        VuoRendererNode *newNode = createNode(nodeClassName, "",
                        event->scenePos().x()-hotSpot.x()+1,
                        event->scenePos().y()-VuoRendererNode::nodeHeaderYOffset-hotSpot.y()+1);
 
        newNodes.append(newNode);
        emit componentsAdded(newNodes, this);
    }
    else
    {
        event->ignore();
    }
}
 
void VuoEditorComposition::mouseDoubleClickEvent(QGraphicsSceneMouseEvent *event)
{
    QGraphicsItem *nearbyItem = findNearbyComponent(event->scenePos());
    if (dynamic_cast<VuoRendererPort *>(nearbyItem))
    {
        QGraphicsScene::sendEvent(nearbyItem, event);
        event->accept();
    }
 
    else
        QGraphicsScene::mouseDoubleClickEvent(event);
}
 
void VuoEditorComposition::mousePressEvent(QGraphicsSceneMouseEvent *event)
{
    QPointF scenePos = event->scenePos();
 
    // Handle left-button presses.
    if (event->button() == Qt::LeftButton)
    {
        // Correct for erroneous tracking behavior that occurs following the first left-click
        // directly on a node, cable, or comment after the cancellation of a component duplication operation.
        // See https://b33p.net/kosada/node/3339
        if (duplicationCancelled)
        {
            QGraphicsItem *itemClickedDirectly = itemAt(scenePos, views()[0]->transform());
            if (dynamic_cast<VuoRendererNode *>(itemClickedDirectly) ||
                    dynamic_cast<VuoRendererCable *>(itemClickedDirectly) ||
                    dynamic_cast<VuoRendererComment *>(itemClickedDirectly)
                )
            {
                duplicationCancelled = false;
                correctForCancelledDuplication(event);
            }
        }
 
        // Determine whether the cursor is in range of any operable composition components.
        QGraphicsItem *nearbyItem = findNearbyComponent(scenePos);
        leftMousePressEventAtNearbyItem(nearbyItem, event);
    }
 
    // Handle non-left-button presses.
    else // if (event->button() != Qt::LeftButton)
        mousePressEventNonLeftButton(event);
}
 
void VuoEditorComposition::leftMousePressEventAtNearbyItem(QGraphicsItem *nearbyItem, QGraphicsSceneMouseEvent *event)
{
    bool eventHandled = false;
 
    // If click did not occur within range of a port, check whether
    // the click occured on a cable within its yank zone.
    VuoRendererCable *cableYankedDirectly = NULL;
    VuoRendererPort *currentPort = dynamic_cast<VuoRendererPort *>(nearbyItem);
    if (! currentPort)
    {
        VuoRendererCable *currentCable = dynamic_cast<VuoRendererCable *>(nearbyItem);
        if (currentCable &&
                currentCable->yankZoneIncludes(event->scenePos()) &&
                currentCable->getBase()->getToPort())
        {
            currentPort = currentCable->getBase()->getToPort()->getRenderer();
            cableYankedDirectly = currentCable;
        }
    }
 
    if (currentPort)
    {
        // Case: Firing an event by Command+click
        bool isTriggerPort = (currentPort->getBase()->hasCompiler() && dynamic_cast<VuoCompilerTriggerPort *>(currentPort->getBase()->getCompiler()));
        if ((event->modifiers() & Qt::ControlModifier) && (currentPort->getInput() || isTriggerPort))
            fireTriggerPortEvent(currentPort->getBase());
 
        else
        {
            portWithDragInitiated = currentPort;
            cableWithYankInitiated = cableYankedDirectly;
            event->accept();
        }
 
        eventHandled = true;
    }
 
    // Case: Initiating duplication of selected components with Option/Alt+drag
    else if (nearbyItem && VuoEditorUtilities::optionKeyPressedForEvent(event) && !duplicationDragInProgress)
    {
        // Duplicate the selected components.
        duplicateOnNextMouseMove = true;
        duplicationDragInProgress = true;
        cursorPosBeforeDuplicationDragMove = (VuoRendererItem::getSnapToGrid()?
                                                  VuoRendererComposition::quantizeToNearestGridLine(event->scenePos(),
                                                                                                    VuoRendererComposition::minorGridLineSpacing) :
                                                  event->scenePos());
 
        QGraphicsScene::mousePressEvent(event);
        eventHandled = true;
    }
 
    // Case: Left mouse-click made near enough to a cable to trigger cable selection
    if (dynamic_cast<VuoRendererCable *>(nearbyItem))
    {
        if (event->modifiers() & Qt::ControlModifier)
            nearbyItem->setSelected(! nearbyItem->isSelected());
 
        else
        {
            deselectAllCompositionComponents();
            nearbyItem->setSelected(true);
        }
 
        event->accept();
        eventHandled = true;
    }
 
    // Case: Left mouse-click made for some other reason, not handled here
    if (!eventHandled)
        QGraphicsScene::mousePressEvent(event);
}
 
void VuoEditorComposition::mousePressEventNonLeftButton(QGraphicsSceneMouseEvent *event)
{
    cancelCableDrag();
 
    // If a right-click occurred, generate the context menu event ourselves
    // rather than leaving it to QGraphicsScene.  This prevents existing selected
    // components from being erroneously de-selected before
    // VuoEditorComposition::contextMenuEvent(...) is called if the right-click
    // occurred within range of, but not directly upon, a composition component.
    if (event->button() == Qt::RightButton)
    {
        QGraphicsSceneContextMenuEvent contextMenuEvent(QEvent::GraphicsSceneContextMenu);
        contextMenuEvent.setScreenPos(event->screenPos());
        contextMenuEvent.setScenePos(event->scenePos());
        contextMenuEvent.setReason(QGraphicsSceneContextMenuEvent::Mouse);
        QApplication::sendEvent(this, &contextMenuEvent);
        event->accept();
    }
 
    else
        QGraphicsScene::mousePressEvent(event);
 
    return;
}
 
void VuoEditorComposition::correctForCancelledDuplication(QGraphicsSceneMouseEvent *event)
{
    // Simulate an extra mouse click for now to force the cursor
    // to track correctly with the next set of dragged components.
    QGraphicsSceneMouseEvent pressEvent(QEvent::GraphicsSceneMousePress);
    pressEvent.setScenePos(event->scenePos());
    pressEvent.setButton(Qt::LeftButton);
    QApplication::sendEvent(this, &pressEvent);
 
    QGraphicsSceneMouseEvent releaseEvent(QEvent::GraphicsSceneMouseRelease);
    releaseEvent.setScenePos(event->scenePos());
    releaseEvent.setButton(Qt::LeftButton);
    QApplication::sendEvent(this, &releaseEvent);
}
 
void VuoEditorComposition::initiateCableDrag(VuoRendererPort *currentPort, VuoRendererCable *cableYankedDirectly, QGraphicsSceneMouseEvent *event)
{
    Qt::KeyboardModifiers modifiers = event->modifiers();
    bool optionKeyPressed = (modifiers & Qt::AltModifier);
    bool shiftKeyPressed = (modifiers & Qt::ShiftModifier);
 
    // For now, a left mouse press on an input port with a constant value, attached typecast, or attached "Make List" node does nothing.
    // Eventually, a mouse drag will detach the constant value, typecast, or "Make List" node.
    if (! (cableYankedDirectly || currentPort->getOutput() || currentPort->supportsDisconnectionByDragging()))
    {
        return;
    }
 
    // Determine based on the keypress modifiers and the attributes of the port whether to
    // create a new cable, disconnect an existing cable, or duplicate an existing cable.
    bool creatingNewCable = false;
    bool disconnectingExistingCable = false;
    bool duplicatingExistingCable = false;
 
    VuoPort *fixedPort = currentPort->getBase();
    VuoNode *fixedNode = getUnderlyingParentNodeForPort(fixedPort, this);
 
    VuoNode *fromNode = NULL;
    VuoPort *fromPort = NULL;
    VuoNode *toNode = NULL;
    VuoPort *toPort = NULL;
 
    // Case: Dragging from an output port
    if (currentPort->getOutput())
    {
        // Prepare for the "forward" creation of a new cable.
        fromPort = fixedPort;
        fromNode = fixedNode;
        creatingNewCable = true;
    }
 
    // Case: Dragging from an input port
    else if (! currentPort->getFunctionPort())
    {
        // If the input port has no connected cables to disconnect, prepare for the
        // "backward" creation of a new cable.
        if (currentPort->getBase()->getConnectedCables(true).empty())
        {
            toPort = fixedPort;
            toNode = fixedNode;
            creatingNewCable = true;
        }
 
        // If the input port does have connected cables, prepare for the
        // disconnection or duplication of one of these cables.
        else
        {
            if (optionKeyPressed)
            {
                duplicatingExistingCable = true;
            }
 
            else
                disconnectingExistingCable = true;
        }
    }
 
    // @todo: Case: Dragging from a function port
 
 
    // Perform the actual cable creation, if applicable.
    if (creatingNewCable)
    {
        // Create the cable first and set its endpoints later in case either endpoint is published,
        // since published nodes don't have compilers.
        cableInProgress = (new VuoCompilerCable(NULL,
                                                NULL,
                                                NULL,
                                                NULL))->getBase();
 
        // If the 'Option' key was pressed at the time of the mouse click, make the cable event-only
        // regardless of its connected ports.
        cableInProgress->getCompiler()->setAlwaysEventOnly(shiftKeyPressed);
 
        cableInProgressWasNew = true;
        cableInProgressShouldBeWireless = false;
 
        addCable(cableInProgress);
        cableInProgress->getRenderer()->setFrom(fromNode, fromPort);
        cableInProgress->getRenderer()->setTo(toNode, toPort);
        cableInProgress->getRenderer()->setFloatingEndpointLoc(event->scenePos());
        cableInProgress->getRenderer()->setFloatingEndpointAboveEventPort(false);
        highlightEligibleEndpointsForCable(cableInProgress);
        fixedPort->getRenderer()->updateGeometry();
    }
 
    // Perform the actual cable disconnection, if applicable.
    else if (disconnectingExistingCable)
    {
        // If a cable was yanked by clicking on it directly (rather than on the port), disconnect that cable.
        if (cableYankedDirectly)
            cableInProgress = cableYankedDirectly->getBase();
 
        // Otherwise, disconnect the cable that was connected to the port most recently.
        else
            cableInProgress = currentPort->getBase()->getConnectedCables(true).back();
 
        cableInProgressWasNew = false;
        cableInProgressShouldBeWireless = cableInProgress->hasCompiler() && cableInProgress->getCompiler()->getHidden();
 
        currentPort->updateGeometry();
        cableInProgress->getRenderer()->updateGeometry();
        cableInProgress->getRenderer()->setHovered(false);
        cableInProgress->getRenderer()->setFloatingEndpointLoc(event->scenePos());
        cableInProgress->getRenderer()->setFloatingEndpointPreviousToPort(cableInProgress->getToPort());
        cableInProgress->getRenderer()->setPreviouslyAlwaysEventOnly(cableInProgress->getCompiler()->getAlwaysEventOnly());
        cableInProgress->getRenderer()->setFloatingEndpointAboveEventPort(false);
        cableInProgress->getRenderer()->setTo(NULL, NULL);
        highlightEligibleEndpointsForCable(cableInProgress);
        deselectAllCompositionComponents();
        cableInProgress->getRenderer()->setSelected(true);
    }
    // Perform the actual cable duplication, if applicable.
    else if (duplicatingExistingCable)
    {
        VuoCable *cableToDuplicate = NULL;
        // If a cable was yanked by clicking on it directly (rather than on the port), disconnect that cable.
        if (cableYankedDirectly)
            cableToDuplicate = cableYankedDirectly->getBase();
 
        // Otherwise, disconnect the cable that was connected to the port most recently.
        else
            cableToDuplicate = currentPort->getBase()->getConnectedCables(true).back();
 
        // Create the cable first and set its endpoints later in case either endpoint is published,
        // since published nodes don't have compilers.
        cableInProgress = (new VuoCompilerCable(NULL,
                                                NULL,
                                                NULL,
                                                NULL))->getBase();
 
        // If the 'Option' key was pressed at the time of the mouse click, make the cable event-only
        // regardless of its connected ports.
        cableInProgress->getCompiler()->setAlwaysEventOnly(shiftKeyPressed);
 
        cableInProgressWasNew = true;
        cableInProgressShouldBeWireless = cableToDuplicate->hasCompiler() &&
                                                      cableToDuplicate->getCompiler()->getHidden();
        addCable(cableInProgress);
        cableInProgress->getRenderer()->setFrom(getUnderlyingParentNodeForPort(cableToDuplicate->getFromPort(), this),
                                                cableToDuplicate->getFromPort());
        cableInProgress->getRenderer()->setTo(NULL, NULL);
        cableInProgress->getRenderer()->setFloatingEndpointLoc(event->scenePos());
        cableInProgress->getRenderer()->setFloatingEndpointAboveEventPort(false);
        highlightEligibleEndpointsForCable(cableInProgress);
        deselectAllCompositionComponents();
        cableInProgress->getRenderer()->setSelected(true);
        fixedPort->getRenderer()->updateGeometry();
    }
 
    // The cable will need to be re-painted as its endpoint is dragged.
    cableInProgress->getRenderer()->setCacheMode(QGraphicsItem::NoCache);
 
    emit cableDragInitiated();
 
    event->accept();
}
 
void VuoEditorComposition::mouseReleaseEvent(QGraphicsSceneMouseEvent *event)
{
    // Handle left-button releases.
    if (event->button() == Qt::LeftButton)
    {
        portWithDragInitiated = NULL;
        cableWithYankInitiated = NULL;
        duplicateOnNextMouseMove = false;
        duplicationDragInProgress = false;
        dragStickinessDisabled = false;
        emit leftMouseButtonReleased();
        clearCableEndpointEligibilityHighlighting();
 
        // If there was a cable drag in progress at the time of the left-mouse-button
        // release, conclude the drag -- either by connecting the cable to the eligible port
        // at which it was dropped, or, if not dropped at an eligible port, by deleting the cable.
        bool cableDragEnding = cableInProgress;
        if (cableDragEnding)
            concludeCableDrag(event);
 
        QGraphicsItem *item = findNearbyComponent(event->scenePos());
        VuoRendererPort *port = dynamic_cast<VuoRendererPort *>(item);
        VuoRendererNode *node = dynamic_cast<VuoRendererNode *>(item);
        if (port)
        {
            // Display the port popover, as long as the mouse release did not have any keyboard modifiers
            // and did not mark the end of a drag.
            // Do so even if a cable drag was technically in progress, because all it takes to initiate
            // a cable drag is a mouse press. We could trigger cable drags upon mouse move events instead of
            // mouse press events to avoid this.
            if ((event->modifiers() == Qt::NoModifier) &&
                    (QLineF(event->screenPos(), event->buttonDownScreenPos(Qt::LeftButton)).length() < QApplication::startDragDistance()))
            {
                VuoRendererTypecastPort *typecastPort = dynamic_cast<VuoRendererTypecastPort *>(port);
                if (typecastPort)
                {
                    // Since the rendering of the typecast body includes its host port, display popovers for both.
                    VuoRendererNode *typecastNode = typecastPort->getUncollapsedTypecastNode();
                    enablePopoverForNode(typecastNode);
                    enableInactivePopoverForPort(typecastPort->getReplacedPort());
                }
 
                else
                    enableInactivePopoverForPort(port);
            }
        }
 
        else // if (!port)
        {
            if (!cableDragEnding && !node)
                emit emptyCanvasLocationLeftClicked();
        }
 
        if (!cableDragEnding)
            QGraphicsScene::mouseReleaseEvent(event);
    }
 
    // Handle non-left-button releases.
    else // if (event->button() != Qt::LeftButton)
    {
        QGraphicsScene::mouseReleaseEvent(event);
    }
}
 
void VuoEditorComposition::concludeCableDrag(QGraphicsSceneMouseEvent *event)
{
    cableInProgress->getRenderer()->setFloatingEndpointAboveEventPort(false);
 
    // Conclude drags of published cables as a special case.
    // @todo: Integrate this more naturally.
    if (cableInProgress->isPublished())
    {
        concludePublishedCableDrag(event);
        return;
    }
 
    if (hasFeedbackErrors())
    {
        cancelCableDrag();
        updateFeedbackErrors();
        return;
    }
 
    cableInProgress->getRenderer()->setWireless(cableInProgressShouldBeWireless);
 
    // Input or output port that the cable is being dragged from (i.e., the fixed endpoint).
    VuoRendererPort *fixedPort = NULL;
    if (cableInProgress->getFromNode() && cableInProgress->getFromPort())
        fixedPort = cableInProgress->getFromPort()->getRenderer();
    else if (cableInProgress->getToNode() && cableInProgress->getToPort())
        fixedPort = cableInProgress->getToPort()->getRenderer();
 
    // We will determine based on the presence or absence of an eligible port near the
    // location of the mouse release whether to connect or delete the dragged cable.
    bool completedCableConnection = false;
 
    // Potential side effects of a newly completed cable connection:
    VuoCable *dataCableToDisplace = NULL; // A previously existing incoming data+event cable may need to be displaced.
    VuoCable *cableToReplace = NULL; // A previously existing cable connecting the same two ports may need to be replaced.
    VuoRendererNode *typecastNodeToDelete = NULL; // A previously attached typecast may need to be deleted.
    VuoRendererPort *portToUnpublish = NULL; // A previously published port may need to be unpublished.
    string typecastToInsert = ""; // A typecast may need to be automatically inserted.
 
    // A generic port involved in the new connection may need to be specialized.
    VuoRendererPort *portToSpecialize = NULL;
    string specializedTypeName = "";
 
    // Input or output port that the cable is being dropped onto, if any.
    VuoRendererPort *targetPort = (VuoRendererPort *)findNearbyPort(event->scenePos(), false);
 
    // Node header area that the cable is being dropped onto, if any.
    // (If over both a port drop zone and a node header, the node header gets precedence.)
    {
        VuoRendererNode *targetNode = findNearbyNodeHeader(event->scenePos());
        if (targetNode)
        {
            targetPort = findTargetPortForCableDroppedOnNodeHeader(targetNode);
            if (targetPort)
                cableInProgress->getCompiler()->setAlwaysEventOnly(true);
        }
    }
 
    bool draggingPreviouslyPublishedCable = (!cableInProgressWasNew &&
                                             (dynamic_cast<VuoRendererPublishedPort *>(fixedPort) ||
                                             ((cableInProgress->getToPort() == NULL) &&
                                              dynamic_cast<VuoRendererPublishedPort *>(cableInProgress->getRenderer()->getFloatingEndpointPreviousToPort()->getRenderer()))));
 
    if (fixedPort && targetPort)
    {
        // If the user has simply disconnected a cable and reconnected it within the same mouse drag,
        // don't push the operation onto the Undo stack.
        bool recreatingSameConnection = ((cableInProgress->getRenderer()->getFloatingEndpointPreviousToPort() ==
                                     targetPort->getBase()) &&
                                    (cableInProgress->getRenderer()->getPreviouslyAlwaysEventOnly() ==
                                     cableInProgress->getCompiler()->getAlwaysEventOnly()));
        if (recreatingSameConnection)
        {
            revertCableDrag();
            return;
        }
 
        bool cableInProgressExpectedToCarryData = cableInProgress->getRenderer()->effectivelyCarriesData() &&
                                                  targetPort->getDataType();
 
        VuoCable *preexistingCable = fixedPort->getCableConnectedTo(targetPort, false);
        bool preexistingCableWithMatchingDataCarryingStatus = (preexistingCable?
                                                                   (preexistingCable->getRenderer()->effectivelyCarriesData() ==
                                                                    cableInProgressExpectedToCarryData) :
                                                                   false);
 
        // Case: Replacing a pre-existing cable that connected the same two ports
        // but with a different data-carrying status, and whose "To" port is
        // the child port of a collapsed typecast.
        if (preexistingCable && !preexistingCableWithMatchingDataCarryingStatus &&
                preexistingCable->getToPort()->hasRenderer() &&
                preexistingCable->getToPort()->getRenderer()->getTypecastParentPort())
        {
            // @todo Implement for https://b33p.net/kosada/node/14153
            // For now, don't attempt it.
            revertCableDrag();
            return;
        }
 
        // Case: Completing a "forward" cable connection from an output port to an input port
        if (!preexistingCableWithMatchingDataCarryingStatus &&
                (fixedPort->canConnectDirectlyWithoutSpecializationTo(targetPort, !cableInProgress->getRenderer()->effectivelyCarriesData()) ||
                 selectBridgingSolution(fixedPort, targetPort, true, &portToSpecialize, specializedTypeName, typecastToInsert)))
        {
            // If input port had a connected collapsed typecast, uncollapse it.
            VuoRendererTypecastPort *typecastPort = dynamic_cast<VuoRendererTypecastPort *>(targetPort);
            if (typecastPort)
            {
                VuoRendererPort *adjustedTargetPort = typecastPort->getReplacedPort();
                VuoRendererPort *childPort = typecastPort->getChildPort();
                VuoRendererNode *uncollapsedTypecast = uncollapseTypecastNode(typecastPort);
                VuoPort *typecastOutPort = uncollapsedTypecast->getBase()->getOutputPorts()[VuoNodeClass::unreservedOutputPortStartIndex];
 
                targetPort = adjustedTargetPort;
 
                // If the typecast did not have multiple incoming cables, and the new cable will
                // be replacing it as a data source, delete the typecast.
                if (cableInProgressExpectedToCarryData &&
                        childPort->getBase()->getConnectedCables(true).size() < 2 &&
                        (*typecastOutPort->getConnectedCables(true).begin())->getRenderer()->effectivelyCarriesData())
                    typecastNodeToDelete = uncollapsedTypecast;
            }
 
            // If connecting two ports that already had a cable (of different data-carrying status) connecting them,
            // replace the pre-existing cable.
            if (preexistingCable)
                cableToReplace = preexistingCable;
 
            // If the cable carries data, determine what other sources of input data need to be
            // removed before completing this connection.
            if (cableInProgressExpectedToCarryData)
            {
                // If input port already had a connected data cable, delete that cable.
                vector<VuoCable *> previousConnectedCables = targetPort->getBase()->getConnectedCables(false);
                for (vector<VuoCable *>::iterator cable = previousConnectedCables.begin(); (! dataCableToDisplace) && (cable != previousConnectedCables.end()); ++cable)
                    if ((((*cable)->getRenderer()->effectivelyCarriesData()) && (*cable) != cableToReplace))
                        dataCableToDisplace = *cable;
 
                // If the input port was published as a data+event port, unpublish it.
                // @todo: Let published cable disconnection handle port unpublication.
                if (isPortPublished(targetPort))
                {
                    vector<VuoRendererPublishedPort *> publishedDataConnections = targetPort->getPublishedPortsConnectedByDataCarryingCables();
                    if (publishedDataConnections.size() > 0)
                        portToUnpublish = targetPort;
                }
            }
 
            completedCableConnection = true;
        }
 
        // Case: Completing a "backward" cable connection from an input port to an output port
        else if (!preexistingCableWithMatchingDataCarryingStatus &&
                 (targetPort->canConnectDirectlyWithoutSpecializationTo(fixedPort, !cableInProgress->getRenderer()->effectivelyCarriesData()) ||
                  selectBridgingSolution(targetPort, fixedPort, false, &portToSpecialize, specializedTypeName, typecastToInsert)))
 
        {
            completedCableConnection = true;
        }
    }
 
    // Complete the actual cable connection, if applicable.
    if (completedCableConnection)
    {
        emit undoStackMacroBeginRequested("Cable Connection");
 
        if (draggingPreviouslyPublishedCable)
        {
            // Record some information about the cable in progress, to create a replica.
            VuoNode *cableInProgressFromNode = cableInProgress->getFromNode();
            VuoNode *cableInProgressToNode = cableInProgress->getToNode();
            VuoPort *cableInProgressFromPort = cableInProgress->getFromPort();
            VuoPort *cableInProgressToPort = cableInProgress->getToPort();
            QPointF cableInProgressFloatingEndpointLoc = cableInProgress->getRenderer()->getFloatingEndpointLoc();
            bool cableInProgressAlwaysEventOnly = cableInProgress->getCompiler()->getAlwaysEventOnly();
 
            // Remove the original cable, unpublishing the port in the process.
            cancelCableDrag();
 
            // Restore a copy of the cable to participate in the new connection.
            VuoCable *cableInProgressCopy = (new VuoCompilerCable(NULL,
                                                    NULL,
                                                    NULL,
                                                    NULL))->getBase();
 
            cableInProgressCopy->setFrom(cableInProgressFromNode, cableInProgressFromPort);
            cableInProgressCopy->setTo(cableInProgressToNode, cableInProgressToPort);
 
            addCable(cableInProgressCopy);
 
            cableInProgressCopy->getCompiler()->setAlwaysEventOnly(cableInProgressAlwaysEventOnly);
            cableInProgressCopy->getRenderer()->setFloatingEndpointLoc(cableInProgressFloatingEndpointLoc);
 
            cableInProgress = cableInProgressCopy;
            cableInProgressWasNew = true;
        }
 
        // Workaround to avoid Qt's parameter count limit for signals/slots.
        pair<VuoRendererCable *, VuoRendererCable *> cableArgs = std::make_pair((dataCableToDisplace? dataCableToDisplace->getRenderer() : NULL),
                                                            (cableToReplace? cableToReplace->getRenderer() : NULL));
        pair<string, string> typeArgs = std::make_pair(typecastToInsert, specializedTypeName);
        pair<VuoRendererPort *, VuoRendererPort *> portArgs = std::make_pair(portToUnpublish, portToSpecialize);
 
        emit connectionCompletedByDragging(cableInProgress->getRenderer(),
                                           targetPort,
                                           cableArgs,
                                           typecastNodeToDelete,
                                           typeArgs,
                                           portArgs);
 
        emit undoStackMacroEndRequested();
 
        // Resume caching for dragged cable.
        if (cableInProgress)
        {
            cableInProgress->getRenderer()->updateGeometry();
            cableInProgress->getRenderer()->setCacheMode(getCurrentDefaultCacheMode());
            cableInProgress = NULL;
        }
    }
 
    // Otherwise, delete the cable.
    else // if (! completedCableConnection)
        cancelCableDrag();
 
    emit cableDragEnded();
}
 
void VuoEditorComposition::concludePublishedCableDrag(QGraphicsSceneMouseEvent *event)
{
    VuoRendererPort *fixedPort;
    if (cableInProgress->getFromNode() && cableInProgress->getFromPort())
        fixedPort = cableInProgress->getFromPort()->getRenderer();
    else // if (cableInProgress->getToNode() && cableInProgress->getToPort())
        fixedPort = cableInProgress->getToPort()->getRenderer();
 
    // Potential side effects of a newly completed cable connection:
    // - A typecast may need to be automatically inserted.
    string typecastToInsert = "";
 
    // - A generic port involved in the new connection may need to be specialized.
    VuoRendererPort *portToSpecialize = NULL;
    string specializedTypeName = "";
 
    bool forceEventOnlyPublication = !cableInProgress->getRenderer()->effectivelyCarriesData();
 
    // Case: Initiating a cable drag from a published input port.
    if (cableInProgress && cableInProgress->isPublishedInputCable())
    {
        VuoRendererPort *internalInputPort = static_cast<VuoRendererPort *>(findNearbyPort(event->scenePos(), false));
        VuoRendererPublishedPort *publishedInputPort = dynamic_cast<VuoRendererPublishedPort *>(cableInProgress->getFromPort()->getRenderer());
 
        // If the cable was dropped onto a node header area, connect an event-only cable to the node's first input port.
        // (If over both a port drop zone and a node header, the node header gets precedence.)
        {
            VuoRendererNode *targetNode = findNearbyNodeHeader(event->scenePos());
            if (targetNode)
            {
                internalInputPort = findTargetPortForCableDroppedOnNodeHeader(targetNode);
                if (internalInputPort)
                {
                    cableInProgress->getCompiler()->setAlwaysEventOnly(true);
                    forceEventOnlyPublication = true;
                }
            }
        }
 
        // Case: Cable was dropped onto an internal input port
        if (internalInputPort &&
                publishedInputPort)
        {
            // If the user has simply disconnected a cable and reconnected it within the same mouse drag,
            // don't push the operation onto the Undo stack.
            bool recreatingSameConnection = ((cableInProgress->getRenderer()->getFloatingEndpointPreviousToPort() ==
                                         internalInputPort->getBase()) &&
                                        (cableInProgress->getRenderer()->getPreviouslyAlwaysEventOnly() ==
                                         cableInProgress->getCompiler()->getAlwaysEventOnly()));
            if (recreatingSameConnection)
            {
                revertCableDrag();
                return;
            }
 
            // Case: Ports are compatible
            if ((publishedInputPort->isCompatibleAliasWithSpecializationForInternalPort(internalInputPort, forceEventOnlyPublication, &portToSpecialize, specializedTypeName))
                    || selectBridgingSolution(publishedInputPort, internalInputPort, true, &portToSpecialize, specializedTypeName, typecastToInsert))
            {
                bool cableInProgressExpectedToCarryData = (cableInProgress->getRenderer()->effectivelyCarriesData() &&
                                                          internalInputPort->getDataType());
                VuoCable *cableToReplace = publishedInputPort->getCableConnectedTo(internalInputPort, true);
                bool cableToReplaceHasMatchingDataCarryingStatus = (cableToReplace?
                                                                        (cableToReplace->getRenderer()->effectivelyCarriesData() ==
                                                                         cableInProgressExpectedToCarryData) :
                                                                        false);
 
                // If replacing a preexisting cable with an identical cable, just cancel the operation
                // so that it doesn't go onto the Undo stack.
                if (cableToReplace && cableToReplaceHasMatchingDataCarryingStatus)
                    cancelCableDrag();
 
                // Case: Replacing a pre-existing cable that connected the same two ports
                // but with a different data-carrying status, and whose "To" port is
                // the child port of a collapsed typecast.
                else if (cableToReplace && !cableToReplaceHasMatchingDataCarryingStatus &&
                         cableToReplace->getToPort()->hasRenderer() &&
                         cableToReplace->getToPort()->getRenderer()->getTypecastParentPort())
                {
                    // @todo Implement for https://b33p.net/kosada/node/14153
                    // For now, don't attempt it.
                    cancelCableDrag();
                }
 
                else
                {
                    emit undoStackMacroBeginRequested("Cable Connection");
                    cancelCableDrag();
 
                    // If this source/target port combination already a cable connecting them, but of a different
                    // data-carrying status, replace the old cable with the new one.
                    if (cableToReplace && !cableToReplaceHasMatchingDataCarryingStatus)
                    {
                        QList<QGraphicsItem *> removedComponents;
                        removedComponents.append(cableToReplace->getRenderer());
                        emit componentsRemoved(removedComponents, "Delete");
                    }
 
                    // If the target port had a connected collapsed typecast, uncollapse and delete it.
                    // But first check whether the collapsed typecast is still present on canvas -- it's possible it was
                    // already removed during the cancelCableDrag() call, if the cable being dragged was the
                    // typecast's incoming data+event cable.
                    VuoRendererTypecastPort *typecastPort = dynamic_cast<VuoRendererTypecastPort *>(internalInputPort);
                    if (typecastPort && typecastPort->scene())
                    {
                        VuoRendererPort *childPort = typecastPort->getChildPort();
                        VuoRendererNode *uncollapsedTypecast = uncollapseTypecastNode(typecastPort);
                        VuoPort *typecastOutPort = uncollapsedTypecast->getBase()->getOutputPorts()[VuoNodeClass::unreservedOutputPortStartIndex];
 
                        // If the typecast did not have multiple incoming cables, and the new cable will
                        // be replacing it as a data source, delete the typecast.
                        if (cableInProgressExpectedToCarryData &&
                                childPort->getBase()->getConnectedCables(true).size() < 2 &&
                                (*typecastOutPort->getConnectedCables(true).begin())->getRenderer()->effectivelyCarriesData())
                        {
                            QList<QGraphicsItem *> removedComponents;
                            removedComponents.append(uncollapsedTypecast);
                            emit componentsRemoved(removedComponents, "Delete");
                        }
                    }
 
                    emit portPublicationRequested(internalInputPort->getBase(),
                                                  dynamic_cast<VuoPublishedPort *>(publishedInputPort->getBase()),
                                                  forceEventOnlyPublication,
                                                  (portToSpecialize? portToSpecialize->getBase() : NULL),
                                                  specializedTypeName,
                                                  typecastToInsert,
                                                  false); // Avoid nested Undo stack macros.
                    emit undoStackMacroEndRequested();
                }
            }
            else // Source port and target port aren't compatible
                cancelCableDrag();
        }
        else // Cable was dropped over empty canvas space
            cancelCableDrag();
    }
 
    // Case: Initiating a cable drag from a published output port.
    else if (cableInProgress && cableInProgress->isPublishedOutputCable())
    {
        VuoRendererPort *internalOutputPort = static_cast<VuoRendererPort *>(findNearbyPort(event->scenePos(), false));
        VuoRendererPublishedPort *publishedOutputPort = dynamic_cast<VuoRendererPublishedPort *>(cableInProgress->getToPort()->getRenderer());
 
        // If the cable was dropped onto a node header area, connect an event-only cable to the node's first output port.
        // (If over both a port drop zone and a node header, the node header gets precedence.)
        {
            VuoRendererNode *targetNode = findNearbyNodeHeader(event->scenePos());
            if (targetNode)
            {
                internalOutputPort = findTargetPortForCableDroppedOnNodeHeader(targetNode);
                if (internalOutputPort)
                {
                    cableInProgress->getCompiler()->setAlwaysEventOnly(true);
                    forceEventOnlyPublication = true;
                }
            }
        }
 
        // Case: Cable was dropped onto an internal output port
        if (internalOutputPort &&
                publishedOutputPort)
        {
 
            // Case: Ports are compatible
            if ((publishedOutputPort->isCompatibleAliasWithSpecializationForInternalPort(internalOutputPort, forceEventOnlyPublication, &portToSpecialize, specializedTypeName) &&
                  publishedOutputPort->canAccommodateInternalPort(internalOutputPort, forceEventOnlyPublication))
                    || selectBridgingSolution(internalOutputPort, publishedOutputPort, false, &portToSpecialize, specializedTypeName, typecastToInsert))
            {
                emit portPublicationRequested(internalOutputPort->getBase(),
                                              dynamic_cast<VuoPublishedPort *>(publishedOutputPort->getBase()),
                                              forceEventOnlyPublication,
                                              portToSpecialize? portToSpecialize->getBase() : NULL,
                                              specializedTypeName,
                                              typecastToInsert,
                                              true);
            }
        }
 
        cancelCableDrag();
    }
 
    emit cableDragEnded();
}
 
void VuoEditorComposition::cancelCableDrag()
{
    clearCableEndpointEligibilityHighlighting();
 
    if (! cableInProgress)
        return;
 
    if (cableInProgressWasNew)
        removeCable(cableInProgress->getRenderer());
    else
    {
        QList<QGraphicsItem *> removedComponents;
        removedComponents.append(cableInProgress->getRenderer());
        emit componentsRemoved(removedComponents, "Delete");
    }
 
    cableInProgress = NULL;
}
 
void VuoEditorComposition::revertCableDrag()
{
    if (cableInProgress && cableInProgress->getRenderer()->getFloatingEndpointPreviousToPort())
    {
        cableInProgress->getRenderer()->setCacheMode(QGraphicsItem::NoCache);
        cableInProgress->getRenderer()->updateGeometry();
        cableInProgress->setTo(getUnderlyingParentNodeForPort(cableInProgress->getRenderer()->getFloatingEndpointPreviousToPort(), this),
                               cableInProgress->getRenderer()->getFloatingEndpointPreviousToPort());
        cableInProgress->getRenderer()->setCacheMode(getCurrentDefaultCacheMode());
        cableInProgress = NULL;
    }
    else if (cableInProgress)
    {
        cancelCableDrag();
    }
 
    clearCableEndpointEligibilityHighlighting();
    updateFeedbackErrors();
    emit cableDragEnded();
}
 
void VuoEditorComposition::mouseMoveEvent(QGraphicsSceneMouseEvent *event)
{
    bool leftMouseButtonPressed = (event->buttons() & Qt::LeftButton);
 
    // Disable Mission Control workaround, since it sometimes misdetects whether the left mouse
    // button is pressed and overzealously cancels cable drags (specifically, those originating from
    // sidebar published output ports).  The workaround no longer appears to be effective as of Qt 5.2.1 anyway.
    /*
    // In the unlikely situation that we have a cable drag in progress but the left mouse
    // button is not pressed (e.g., if "Mission Control" was activated during a cable drag and
    // deactivated by releasing the mouse button), cancel the cable drag.
    // See https://b33p.net/kosada/node/3305
    if (cableInProgress && !menuSelectionInProgress && !leftMouseButtonPressed)
        cancelCableDrag();
    */
 
    // If in the process of a cable drag or mouse-over operation,
    // locate the nearest port or cable eligible for hover highlighting.
    if (cableInProgress || (! leftMouseButtonPressed))
        updateHoverHighlighting(event->scenePos());
 
 
    // Case: Left mouse button pressed
    if (leftMouseButtonPressed)
    {
        // Eliminate mouse jitter noise.
        if ((! dragStickinessDisabled) && (QLineF(event->screenPos(), event->buttonDownScreenPos(Qt::LeftButton)).length() < QApplication::startDragDistance()))
            return;
 
        else
            dragStickinessDisabled = true;
 
        // If a port or cable has been clicked for dragging and this is the first mouse move event
        // since the click, initiate the cable drag.
        if (portWithDragInitiated || cableWithYankInitiated)
        {
            initiateCableDrag(portWithDragInitiated, cableWithYankInitiated, event);
            portWithDragInitiated = NULL;
            cableWithYankInitiated = NULL;
        }
 
        // If there is a cable drag in progress, update the location of the cable's
        // floating endpoint to match that of the cursor.
        if (cableInProgress)
        {
            VuoRendererCable *rc = cableInProgress->getRenderer();
 
            rc->updateGeometry();
            rc->setFloatingEndpointLoc(event->scenePos());
 
            repaintFeedbackErrorMarks();
        }
 
        else if (duplicationDragInProgress)
        {
            if (duplicateOnNextMouseMove)
            {
                emit selectedComponentsDuplicated();
                duplicateOnNextMouseMove = false;
            }
 
            QPointF newPos = (VuoRendererItem::getSnapToGrid()?
                                  VuoRendererComposition::quantizeToNearestGridLine(event->scenePos(),
                                                                                    VuoRendererComposition::minorGridLineSpacing) :
                                  event->scenePos());
            QPointF delta = newPos - cursorPosBeforeDuplicationDragMove;
            moveItemsBy(getSelectedNodes(), getSelectedComments(), delta.x(), delta.y(), false);
            cursorPosBeforeDuplicationDragMove = newPos;
        }
 
        else
            QGraphicsScene::mouseMoveEvent(event);
    }
 
    // Case: Left mouse button not pressed
    else
        QGraphicsScene::mouseMoveEvent(event);
}
 
void VuoEditorComposition::updateHoverHighlighting(QPointF scenePos, bool disablePortHoverHighlighting)
{
    auto types = compiler->getTypes();
 
    // Detect cable and port hover events ourselves, since we need to account
    // for their extended hover ranges.
    QGraphicsItem *item = cableInProgress? findNearbyPort(scenePos, false) : findNearbyComponent(scenePos);
    VuoRendererCable *cable = dynamic_cast<VuoRendererCable *>(item);
    VuoRendererPort *port = dynamic_cast<VuoRendererPort *>(item);
    VuoRendererTypecastPort *typecastPort = dynamic_cast<VuoRendererTypecastPort *>(item);
    VuoRendererInputListDrawer *makeListDrawer = dynamic_cast<VuoRendererInputListDrawer *>(item);
 
    // If hovering over a node header area while dragging a cable, treat it like hovering over the first input or output port.
    // (If over both a port drop zone and a node header, the node header gets precedence.)
    bool hoveringOverNodeHeader = false;
    if (cableInProgress)
    {
        VuoRendererNode *targetNode = findNearbyNodeHeader(scenePos);
        if (targetNode)
        {
            port = findTargetPortForCableDroppedOnNodeHeader(targetNode);
            if (port)
            {
                item = targetNode;
                hoveringOverNodeHeader = true;
            }
        }
    }
 
    VuoRendererNode *node = NULL;
    if (! hoveringOverNodeHeader)
    {
        // Do not handle hover events for (non-drawer) nodes here.
        if (dynamic_cast<VuoRendererNode *>(item) && !makeListDrawer)
            item = NULL;
 
        node = dynamic_cast<VuoRendererNode *>(item);
    }
 
    // Case: The item (if any) that requires hover-highlighting given the current position of the cursor
    // is not the same as the item (if any) that was hover-highlighted previously.
    if (item != previousNearbyItem)
    {
        VuoRendererPort *previousPort = dynamic_cast<VuoRendererPort *>(previousNearbyItem);
        VuoRendererNode *previousNode = dynamic_cast<VuoRendererNode *>(previousNearbyItem);
        if (previousNode)
            previousPort = findTargetPortForCableDroppedOnNodeHeader(previousNode);
 
        // End hover-highlighting of the previous item, if any.
        if (previousNearbyItem)
            clearHoverHighlighting();
 
        // Begin hover-highlighting of the current item, if any.
        if (cable)
            cable->extendedHoverEnterEvent();
        else if (node)
        {
            if (! cableInProgress)
            {
                if (makeListDrawer)
                    makeListDrawer->extendedHoverEnterEvent(scenePos);
            }
        }
        else if (typecastPort && !disablePortHoverHighlighting)
            port->extendedHoverEnterEvent((bool)cableInProgress);
        else if (port && !disablePortHoverHighlighting)
        {
            port->extendedHoverEnterEvent((bool)cableInProgress);
            if (!cableInProgress)
            {
                foreach (VuoRendererPort *connectedAntennaPort, port->getPortsConnectedWirelessly(false))
                    connectedAntennaPort->extendedHoverEnterEvent((bool)cableInProgress, true);
            }
        }
 
        VuoRendererPort *previousTargetPort = (previousPort && previousPort->isEligibleForConnection() ? previousPort : NULL);
 
        // If the current item or previous item is a port and it got this status because the mouse hovered
        // over a node header, update the eligibility-highlighting of the port.
        if (cableInProgress)
        {
            VuoRendererPort *fixedPort = (cableInProgress->getFromPort() ?
                                              cableInProgress->getFromPort()->getRenderer() :
                                              cableInProgress->getToPort()->getRenderer());
 
            QList< QPair<VuoRendererPort *, bool> > updatedPorts;
            if (hoveringOverNodeHeader)
                updatedPorts.append( QPair<VuoRendererPort *, bool>(port, true) );
            if (previousNode && previousPort)
                updatedPorts.append( QPair<VuoRendererPort *, bool>(previousPort, !cableInProgress->getRenderer()->effectivelyCarriesData()) );
 
            QPair<VuoRendererPort *, bool> p;
            foreach (p, updatedPorts)
            {
                VuoRendererPort *updatedPort = p.first;
 
                VuoRendererPort *typecastParentPort = updatedPort->getTypecastParentPort();
                if (typecastParentPort)
                    updatedPort = typecastParentPort;
 
                updateEligibilityHighlightingForPort(updatedPort, fixedPort, p.second, types);
 
                VuoRendererNode *potentialDrawer = updatedPort->getUnderlyingParentNode();
                updateEligibilityHighlightingForNode(potentialDrawer);
            }
        }
 
        VuoRendererPort *targetPort = (port && port->isEligibleForConnection() ? port : NULL);
 
        // Update error dialogs and cable's data-carrying status.
        if (targetPort || previousTargetPort)
        {
            if (cableInProgress)
                cableInProgress->getRenderer()->setFloatingEndpointAboveEventPort(targetPort && (!targetPort->getDataType() || hoveringOverNodeHeader));
 
            updateFeedbackErrors(targetPort);
        }
 
        previousNearbyItem = item;
    }
 
    // Case: The previously hover-highlighted item should remain hover-highlighted.
    else if (item)
    {
        if (cable)
            cable->extendedHoverMoveEvent();
        else if (port && !disablePortHoverHighlighting)
        {
            port->extendedHoverMoveEvent((bool)cableInProgress);
            if (!cableInProgress)
            {
                foreach (VuoRendererPort *connectedAntennaPort, port->getPortsConnectedWirelessly(false))
                    connectedAntennaPort->extendedHoverMoveEvent((bool)cableInProgress, true);
            }
        }
        else if (makeListDrawer)
            makeListDrawer->extendedHoverMoveEvent(scenePos);
    }
}
 
void VuoEditorComposition::clearHoverHighlighting()
{
    if (previousNearbyItem)
    {
        VuoRendererCable *cable = dynamic_cast<VuoRendererCable *>(previousNearbyItem);
        VuoRendererPort *port = dynamic_cast<VuoRendererPort *>(previousNearbyItem);
        VuoRendererTypecastPort *typecastPort = dynamic_cast<VuoRendererTypecastPort *>(previousNearbyItem);
        VuoRendererNode *node = dynamic_cast<VuoRendererNode *>(previousNearbyItem);
 
        if (node)
        {
            VuoRendererInputListDrawer *drawer = dynamic_cast<VuoRendererInputListDrawer *>(previousNearbyItem);
            if (drawer)
                drawer->extendedHoverLeaveEvent();
            else
                port = findTargetPortForCableDroppedOnNodeHeader(node);
        }
 
        if (cable)
            cable->extendedHoverLeaveEvent();
        else if (typecastPort)
            port->extendedHoverLeaveEvent();
        else if (port)
        {
            port->extendedHoverLeaveEvent();
            foreach (VuoRendererPort *connectedAntennaPort, port->getPortsConnectedWirelessly(false))
                connectedAntennaPort->extendedHoverLeaveEvent();
        }
 
        previousNearbyItem = NULL;
    }
}
 
void VuoEditorComposition::keyPressEvent(QKeyEvent *event)
{
    if ((event->key() != Qt::Key_Alt) && (event->key() != Qt::Key_Shift) && (event->key() != Qt::Key_Escape))
        cancelCableDrag();
 
    Qt::KeyboardModifiers modifiers = event->modifiers();
    qreal adjustedNodeMoveRate = nodeMoveRate;
    if (modifiers & Qt::ShiftModifier)
    {
        adjustedNodeMoveRate *= nodeMoveRateMultiplier;
    }
 
    switch (event->key()) {
        case Qt::Key_Backspace:
        {
            deleteSelectedCompositionComponents();
            break;
        }
        case Qt::Key_Delete:
        {
            deleteSelectedCompositionComponents();
            break;
        }
        case Qt::Key_Up:
        {
            moveSelectedItemsBy(0, -1*adjustedNodeMoveRate);
            break;
        }
        case Qt::Key_Down:
        {
            if (modifiers & Qt::ControlModifier)
                openSelectedEditableNodes();
            else
                moveSelectedItemsBy(0, adjustedNodeMoveRate);
            break;
        }
        case Qt::Key_Left:
        {
            moveSelectedItemsBy(-1*adjustedNodeMoveRate, 0);
            break;
        }
        case Qt::Key_Right:
        {
            moveSelectedItemsBy(adjustedNodeMoveRate, 0);
            break;
        }
        case Qt::Key_Shift:
        {
            if (cableInProgress)
            {
                cableInProgress->getRenderer()->updateGeometry();
                cableInProgress->getCompiler()->setAlwaysEventOnly(true);
                highlightEligibleEndpointsForCable(cableInProgress);
 
                VuoRendererPort *hoveredPort = dynamic_cast<VuoRendererPort *>(previousNearbyItem);
                if (hoveredPort)
                    updateFeedbackErrors(hoveredPort);
            }
 
            break;
        }
        case Qt::Key_Enter:
        case Qt::Key_Return:
        {
            // Make sure the event is forwarded to any composition component within hover range.
            QGraphicsScene::keyPressEvent(event);
 
            if (!event->isAccepted())
            {
                // Otherwise, if there are any (and only) nodes currently selected, open a title editor for each one;
                // if there are any (and only) comments currently selected, open a comment text editor for each one.
                set<VuoRendererNode *> selectedNodes = getSelectedNodes();
                set<VuoRendererComment *> selectedComments = getSelectedComments();
 
                if (selectedComments.empty() && !selectedNodes.empty())
                    renameSelectedNodes();
            }
 
            break;
        }
 
        case Qt::Key_Escape:
        {
           if (duplicateOnNextMouseMove || duplicationDragInProgress)
           {
              emit duplicationOperationCancelled();
 
              duplicateOnNextMouseMove = false;
              duplicationDragInProgress = false;
              duplicationCancelled = true;
           }
           else if (cableInProgress)
           {
               revertCableDrag();
           }
           break;
        }
 
        default:
        {
            QGraphicsScene::keyPressEvent(event);
            break;
        }
    }
}
 
void VuoEditorComposition::keyReleaseEvent(QKeyEvent *event)
{
    switch (event->key()) {
        case Qt::Key_Shift:
        {
            if (cableInProgress)
            {
                cableInProgress->getRenderer()->updateGeometry();
                cableInProgress->getCompiler()->setAlwaysEventOnly(false);
                highlightEligibleEndpointsForCable(cableInProgress);
 
                VuoRendererPort *hoveredPort = dynamic_cast<VuoRendererPort *>(previousNearbyItem);
                if (hoveredPort)
                    updateFeedbackErrors(hoveredPort);
            }
 
            break;
        }
 
        default:
        {
            QGraphicsScene::keyReleaseEvent(event);
            break;
        }
    }
}
 
void VuoEditorComposition::contextMenuEvent(QGraphicsSceneContextMenuEvent* event)
{
    // Determine whether the cursor is in range of any operable composition components.
    QGraphicsItem *item = findNearbyComponent(event->scenePos());
 
    QMenu contextMenu(VuoEditorWindow::getMostRecentActiveEditorWindow());
    contextMenu.setSeparatorsCollapsible(false); 
 
    // Customize context menu for the canvas.
    if (! item)
    {
        QAction *insertNodeSection = new QAction(tr("Insert Node"), NULL);
        insertNodeSection->setEnabled(false);
        contextMenu.addAction(insertNodeSection);
 
        QString spacer("    ");
 
        {
            // "Share" nodes
            QMenu *shareMenu = new QMenu(&contextMenu);
            shareMenu->setSeparatorsCollapsible(false); 
            shareMenu->setTitle(spacer + tr("Share"));
            contextMenu.addMenu(shareMenu);
 
            {
                QAction *action = new QAction(tr("Share Value"), NULL);
                action->setData(qVariantFromValue(qMakePair(event->scenePos(), QStringLiteral("vuo.data.share"))));
                connect(action, &QAction::triggered, this, &VuoEditorComposition::insertNode);
                shareMenu->addAction(action);
            }
 
            {
                QAction *action = new QAction(tr("Share List"), NULL);
                action->setData(qVariantFromValue(qMakePair(event->scenePos(), QStringLiteral("vuo.data.share.list"))));
                connect(action, &QAction::triggered, this, &VuoEditorComposition::insertNode);
                shareMenu->addAction(action);
            }
 
            {
                QAction *action = new QAction(tr("Share Event"), NULL);
                action->setData(qVariantFromValue(qMakePair(event->scenePos(), QStringLiteral("vuo.event.share"))));
                connect(action, &QAction::triggered, this, &VuoEditorComposition::insertNode);
                shareMenu->addAction(action);
            }
        }
 
        {
            // "Hold" nodes
            QMenu *holdMenu = new QMenu(&contextMenu);
            holdMenu->setSeparatorsCollapsible(false); 
            holdMenu->setTitle(spacer + tr("Hold"));
            contextMenu.addMenu(holdMenu);
 
            {
                QAction *action = new QAction(tr("Hold Value"), NULL);
                action->setData(qVariantFromValue(qMakePair(event->scenePos(), QStringLiteral("vuo.data.hold2"))));
                connect(action, &QAction::triggered, this, &VuoEditorComposition::insertNode);
                holdMenu->addAction(action);
            }
 
            {
                QAction *action = new QAction(tr("Hold List"), NULL);
                action->setData(qVariantFromValue(qMakePair(event->scenePos(), QStringLiteral("vuo.data.hold.list2"))));
                connect(action, &QAction::triggered, this, &VuoEditorComposition::insertNode);
                holdMenu->addAction(action);
            }
        }
 
        {
            // "Allow" nodes
            QMenu *allowMenu = new QMenu(&contextMenu);
            allowMenu->setSeparatorsCollapsible(false); 
            allowMenu->setTitle(spacer + tr("Allow"));
            contextMenu.addMenu(allowMenu);
 
            {
                QAction *action = new QAction(tr("Allow First Event"), NULL);
                action->setData(qVariantFromValue(qMakePair(event->scenePos(), QStringLiteral("vuo.event.allowFirst"))));
                connect(action, &QAction::triggered, this, &VuoEditorComposition::insertNode);
                allowMenu->addAction(action);
            }
 
            {
                QAction *action = new QAction(tr("Allow First Value"), NULL);
                action->setData(qVariantFromValue(qMakePair(event->scenePos(), QStringLiteral("vuo.event.allowFirstValue"))));
                connect(action, &QAction::triggered, this, &VuoEditorComposition::insertNode);
                allowMenu->addAction(action);
            }
 
            {
                QAction *action = new QAction(tr("Allow Periodic Events"), NULL);
                action->setData(qVariantFromValue(qMakePair(event->scenePos(), QStringLiteral("vuo.time.allowPeriodic"))));
                connect(action, &QAction::triggered, this, &VuoEditorComposition::insertNode);
                allowMenu->addAction(action);
            }
 
            {
                QAction *action = new QAction(tr("Allow Changes"), NULL);
                action->setData(qVariantFromValue(qMakePair(event->scenePos(), QStringLiteral("vuo.event.allowChanges2"))));
                connect(action, &QAction::triggered, this, &VuoEditorComposition::insertNode);
                allowMenu->addAction(action);
            }
        }
 
        contextMenu.addSeparator();
 
        QAction *contextMenuInsertComment = new QAction(NULL);
        contextMenuInsertComment->setText(tr("Insert Comment"));
        contextMenuInsertComment->setData(qVariantFromValue(event->scenePos()));
        connect(contextMenuInsertComment, &QAction::triggered, this, &VuoEditorComposition::insertComment);
        contextMenu.addAction(contextMenuInsertComment);
 
        QAction *contextMenuInsertSubcomposition = new QAction(NULL);
        contextMenuInsertSubcomposition->setText(tr("Insert Subcomposition"));
        contextMenuInsertSubcomposition->setData(qVariantFromValue(event->scenePos()));
        connect(contextMenuInsertSubcomposition, &QAction::triggered, this, &VuoEditorComposition::insertSubcomposition);
        contextMenu.addAction(contextMenuInsertSubcomposition);
    }
 
    // Prepare to take a snapshot of the contextMenuDeleteSelection QAction's current values, so that
    // they do not change while the context menu is displayed.
    QAction *contextMenuDeleteSelectedSnapshot = new QAction(NULL);
 
    // Customize context menu for ports.
    if (dynamic_cast<VuoRendererPort *>(item))
    {
        VuoRendererPort *port = (VuoRendererPort *)item;
 
        if (port->isConstant() && inputEditorManager)
        {
            VuoType *dataType = static_cast<VuoCompilerInputEventPort *>(port->getBase()->getCompiler())->getDataVuoType();
            VuoInputEditor *inputEditorLoadedForPortDataType = inputEditorManager->newInputEditor(dataType);
            if (inputEditorLoadedForPortDataType)
            {
                contextMenuSetPortConstant->setData(qVariantFromValue((void *)port));
                contextMenu.addAction(contextMenuSetPortConstant);
 
                inputEditorLoadedForPortDataType->deleteLater();
            }
        }
 
        if (!isPortPublished(port) && port->getPublishable())
        {
            contextMenuPublishPort->setText(tr("Publish Port"));
            contextMenuPublishPort->setData(qVariantFromValue((void *)port));
            contextMenu.addAction(contextMenuPublishPort);
        }
 
        else if (isPortPublished(port))
        {
            vector<VuoRendererPublishedPort *> externalPublishedPorts = port->getPublishedPorts();
            bool hasExternalPublishedPortWithMultipleInternalPorts = false;
            bool hasExternalPublishedPortBelongingToActiveProtocol = false;
            foreach (VuoRendererPublishedPort *externalPort, externalPublishedPorts)
            {
                if (externalPort->getBase()->getConnectedCables(true).size() > 1)
                    hasExternalPublishedPortWithMultipleInternalPorts = true;
 
                if (dynamic_cast<VuoPublishedPort *>(externalPort->getBase())->isProtocolPort())
                    hasExternalPublishedPortBelongingToActiveProtocol = true;
            }
 
            // Omit the "Delete Published Port" context menu item if the internal port is connected to
            // an external published port that cannot be deleted, either because:
            // - It is part of an active protocol;
            // - It has more than one connected cable.
            if (!hasExternalPublishedPortWithMultipleInternalPorts &&!hasExternalPublishedPortBelongingToActiveProtocol)
            {
                contextMenuPublishPort->setText(tr("Delete Published Port"));
                contextMenuPublishPort->setData(qVariantFromValue((void *)port));
                contextMenu.addAction(contextMenuPublishPort);
            }
        }
 
        bool isTriggerPort = dynamic_cast<VuoCompilerTriggerPort *>(port->getBase()->getCompiler());
        if (isTriggerPort || port->getInput())
        {
            __block bool isTopLevelCompositionRunning = false;
            static_cast<VuoEditor *>(qApp)->getSubcompositionRouter()->applyToLinkedTopLevelComposition(this, ^void (VuoEditorComposition *topLevelComposition, string thisCompositionIdentifier)
            {
                isTopLevelCompositionRunning = topLevelComposition->isRunning();
            });
 
            if (isTopLevelCompositionRunning)
            {
                contextMenuFireEvent->setData(qVariantFromValue((void *)port));
                contextMenu.addAction(contextMenuFireEvent);
            }
        }
 
        if (isTriggerPort)
        {
            QMenu *contextMenuThrottling = new QMenu(&contextMenu);
            contextMenuThrottling->setSeparatorsCollapsible(false); 
            contextMenuThrottling->setTitle(tr("Set Event Throttling"));
            int i = VuoPortClass::EventThrottling_Enqueue;
            foreach (QAction *action, contextMenuThrottlingActions)
            {
                contextMenuThrottling->addAction(action);
                action->setData(qVariantFromValue(port));
                action->setCheckable(true);
                action->setChecked( i++ == port->getBase()->getEventThrottling() );
            }
            contextMenu.addMenu(contextMenuThrottling);
        }
 
        // Allow the user to specialize, respecialize, or unspecialize generic data types.
        VuoGenericType *genericDataType = dynamic_cast<VuoGenericType *>(port->getDataType());
        if (genericDataType || isPortCurrentlyRevertible(port))
        {
            QMenu *contextMenuSpecializeGenericType = new QMenu(&contextMenu);
            contextMenuSpecializeGenericType->setSeparatorsCollapsible(false); 
            contextMenuSpecializeGenericType->setTitle(tr("Set Data Type"));
            contextMenuSpecializeGenericType->setToolTipsVisible(true);
 
            QAction *unspecializeAction = contextMenuSpecializeGenericType->addAction(tr("Generic"));
 
            // It is safe to assume that there will be types listed after the "Generic" option
            // since any network of connected generic/specialized ports has at least one compatible
            // data type in common, so the separator can be added here without forward-checking.
            contextMenuSpecializeGenericType->addSeparator();
 
            unspecializeAction->setData(qVariantFromValue((void *)port));
            unspecializeAction->setCheckable(true);
            unspecializeAction->setChecked(genericDataType);
 
            contextMenu.addMenu(contextMenuSpecializeGenericType);
 
            VuoGenericType *genericTypeFromPortClass = NULL; // Original generic type of the port
            set<string> compatibleTypes; // Compatible types in the context of the connected generic port network
            set<string> compatibleTypesInIsolation; // Compatible types for the port in isolation
 
            // Allow the user to specialize generic ports.
            if (genericDataType)
            {
                VuoCompilerPortClass *portClass = static_cast<VuoCompilerPortClass *>(port->getBase()->getClass()->getCompiler());
                genericTypeFromPortClass = static_cast<VuoGenericType *>(portClass->getDataVuoType());
 
                // Determine compatible types in the context of the connected generic port network.
                VuoGenericType::Compatibility compatibility;
                vector<string> compatibleTypesVector = genericDataType->getCompatibleSpecializedTypes(compatibility);
                compatibleTypes = set<string>(compatibleTypesVector.begin(), compatibleTypesVector.end());
 
                // If all types or all list types are compatible, add them to (currently empty) compatibleTypes.
                if (compatibility == VuoGenericType::anyType || compatibility == VuoGenericType::anyListType)
                {
                    vector<string> compatibleTypeNames = getAllSpecializedTypeOptions(compatibility == VuoGenericType::anyListType);
                    compatibleTypes.insert(compatibleTypeNames.begin(), compatibleTypeNames.end());
                }
            }
 
            // Allow the user to re-specialize already specialized ports.
            else if (isPortCurrentlyRevertible(port))
            {
                map<VuoNode *, string> nodesToReplace;
                set<VuoCable *> cablesToDelete;
                createReplacementsToUnspecializePort(port->getBase(), false, nodesToReplace, cablesToDelete);
                if (cablesToDelete.size() >= 1)
                {
                    // @todo https://b33p.net/kosada/node/8895 : Note that this specialization will break connections.
                }
 
                VuoCompilerSpecializedNodeClass *specializedNodeClass = dynamic_cast<VuoCompilerSpecializedNodeClass *>(
                                                                            port->getUnderlyingParentNode()->getBase()->getNodeClass()->getCompiler());
                genericTypeFromPortClass = dynamic_cast<VuoGenericType *>( specializedNodeClass->getOriginalPortType(port->getBase()->getClass()) );
                compatibleTypes = getRespecializationOptionsForPortInNetwork(port);
            }
 
            // Determine compatible types in isolation.
            if (genericTypeFromPortClass)
            {
                // "Make List" drawer child ports require special handling, since technically they are compatible with all types
                // but practically they are limited to types compatible with their host ports.
                VuoRendererInputListDrawer *drawer = dynamic_cast<VuoRendererInputListDrawer *>(port->getUnderlyingParentNode());
                if (drawer)
                {
                    VuoPort *hostPort = drawer->getUnderlyingHostPort();
                    if (hostPort && hostPort->hasRenderer())
                    {
                        VuoCompilerPortClass *portClass = static_cast<VuoCompilerPortClass *>(hostPort->getClass()->getCompiler());
                        VuoGenericType *genericHostPortDataType = dynamic_cast<VuoGenericType *>(hostPort->getRenderer()->getDataType());
                        if (genericHostPortDataType)
                            genericTypeFromPortClass = static_cast<VuoGenericType *>(portClass->getDataVuoType());
                        else if (isPortCurrentlyRevertible(hostPort->getRenderer()))
                        {
                            VuoCompilerNodeClass *nodeClass = hostPort->getRenderer()->getUnderlyingParentNode()->getBase()->getNodeClass()->getCompiler();
                            VuoCompilerSpecializedNodeClass *specializedNodeClass = dynamic_cast<VuoCompilerSpecializedNodeClass *>(nodeClass);
                            genericTypeFromPortClass = dynamic_cast<VuoGenericType *>( specializedNodeClass->getOriginalPortType(portClass->getBase()) );
                        }
                    }
                }
 
                VuoGenericType::Compatibility compatibilityInIsolation = VuoGenericType::whitelistedTypes;
                vector<string> compatibleTypesInIsolationVector;
                if (genericTypeFromPortClass)
                    compatibleTypesInIsolationVector = genericTypeFromPortClass->getCompatibleSpecializedTypes(compatibilityInIsolation);
 
                // If all types or all list types are compatible, add them to (currently empty) compatibleTypesInIsolationVector.
                if (compatibilityInIsolation == VuoGenericType::anyType || compatibilityInIsolation == VuoGenericType::anyListType)
                    compatibleTypesInIsolationVector = getAllSpecializedTypeOptions(compatibilityInIsolation == VuoGenericType::anyListType);
 
                foreach (string type, compatibleTypesInIsolationVector)
                    compatibleTypesInIsolation.insert(drawer? VuoType::extractInnermostTypeName(type) : type);
            }
 
            // List the compatible types in the menu.
            {
                // If there are only a handful of eligible types, display them all in a flat menu.
                const int maxTypeCountForFlatMenuDisplay = 10;
                if (compatibleTypesInIsolation.size() <= maxTypeCountForFlatMenuDisplay)
                {
                    QList<QAction *> actions = getCompatibleTypesForMenu(port, compatibleTypesInIsolation, compatibleTypes, false, "", contextMenuSpecializeGenericType);
                    addTypeActionsToMenu(actions, contextMenuSpecializeGenericType);
                }
 
                // Otherwise, organize them by node set.
                else
                {
                    // First list compatible types that don't belong to any specific node set.
                    QList<QAction *> actions = getCompatibleTypesForMenu(port, compatibleTypesInIsolation, compatibleTypes, true, "", contextMenuSpecializeGenericType);
                    addTypeActionsToMenu(actions, contextMenuSpecializeGenericType);
 
                    // Now add a submenu for each node set that contains compatible types.
                    map<string, set<VuoCompilerType *> > loadedTypesForNodeSet = moduleManager->getLoadedTypesForNodeSet();
                    QList<QAction *> allNodeSetActionsToAdd;
                    for (map<string, set<VuoCompilerType *> >::iterator i = loadedTypesForNodeSet.begin(); i != loadedTypesForNodeSet.end(); ++i)
                    {
                        string nodeSetName = i->first;
                        if (!nodeSetName.empty())
                            allNodeSetActionsToAdd += getCompatibleTypesForMenu(port, compatibleTypesInIsolation, compatibleTypes, true, nodeSetName, contextMenuSpecializeGenericType);
                    }
 
                    if ((contextMenuSpecializeGenericType->actions().size() > 0) && (allNodeSetActionsToAdd.size() > 0))
                        contextMenuSpecializeGenericType->addSeparator();
 
                    addTypeActionsToMenu(allNodeSetActionsToAdd, contextMenuSpecializeGenericType);
                }
 
                foreach (QAction *action, contextMenuSpecializeGenericType->actions())
                {
                    QMenu *specializeSubmenu = action->menu();
                    if (specializeSubmenu)
                    {
                        foreach (QAction *specializeSubaction, specializeSubmenu->actions())
                            connect(specializeSubaction, &QAction::triggered, this, &VuoEditorComposition::specializeGenericPortType);
                    }
                    else if (action == unspecializeAction)
                        connect(action, &QAction::triggered, this, &VuoEditorComposition::unspecializePortType);
                    else
                        connect(action, &QAction::triggered, this, &VuoEditorComposition::specializeGenericPortType);
                }
            }
        }
 
        // Allow the user to hide, unhide, or delete cables connected directly to the port or, if the
        // port has a collapsed typecast, to the typecast's child port.
        int numVisibleDirectlyConnectedCables = 0;
        int numHidableDirectlyConnectedCables = 0;
        int numUnhidableDirectlyConnectedCables = 0;
 
        foreach (VuoCable *cable, port->getBase()->getConnectedCables(true))
        {
            if (!cable->getRenderer()->paintingDisabled())
            {
                numVisibleDirectlyConnectedCables++;
                if (!cable->isPublished())
                    numHidableDirectlyConnectedCables++;
            }
 
            else if (cable->getRenderer()->getEffectivelyWireless())
                numUnhidableDirectlyConnectedCables++;
        }
 
        int numVisibleChildPortConnectedCables = 0;
        int numHidableChildPortConnectedCables = 0;
        int numUnhidableChildPortConnectedCables = 0;
        VuoRendererTypecastPort *typecastPort = dynamic_cast<VuoRendererTypecastPort *>(port);
        if (typecastPort)
        {
            VuoRendererNode *typecastNode = typecastPort->getUncollapsedTypecastNode();
            VuoPort *typecastInPort = typecastNode->getBase()->getInputPorts()[VuoNodeClass::unreservedInputPortStartIndex];
            foreach(VuoCable *cable, typecastInPort->getConnectedCables(true))
            {
                if (!cable->getRenderer()->paintingDisabled())
                {
                    numVisibleChildPortConnectedCables++;
 
                    if (!cable->isPublished())
                        numHidableChildPortConnectedCables++;
                }
                else if (cable->getRenderer()->getEffectivelyWireless())
                    numUnhidableChildPortConnectedCables++;
            }
        }
 
        // Count the number of directly or indirectly connected cables that are currently visible.
        int numVisibleConnectedCables = numVisibleDirectlyConnectedCables + numVisibleChildPortConnectedCables;
 
        // Count the number of directly or indirectly connected cables that are currently hidable.
        int numHidableConnectedCables = numHidableDirectlyConnectedCables + numHidableChildPortConnectedCables;
 
        // Count the number of directly or indirectly connected cables that are currently hidden.
        int numUnhidableConnectedCables = numUnhidableDirectlyConnectedCables + numUnhidableChildPortConnectedCables;
 
        if ((!renderHiddenCables && ((numHidableConnectedCables >= 1) || (numUnhidableConnectedCables >= 1)))
                || (numVisibleConnectedCables >= 1))
        {
            if (!contextMenu.actions().empty() && !contextMenu.actions().last()->isSeparator())
                contextMenu.addSeparator();
        }
 
        if (!renderHiddenCables)
        {
            if (numHidableConnectedCables >= 1)
            {
                // Use numApparentlyHidableConnectedCables instead of numHidableConnectedCables to determine pluralization
                // of menu item text to avoid the appearance of a bug, even though the "Hide" operation will not
                // impact visible published cables.
                int numApparentlyHidableConnectedCables = numVisibleConnectedCables + numUnhidableConnectedCables;
                contextMenuHideCables->setText(numApparentlyHidableConnectedCables > 1? "Hide Cables" : "Hide Cable");
                contextMenuHideCables->setData(qVariantFromValue((void *)port));
                contextMenu.addAction(contextMenuHideCables);
            }
 
            if (numUnhidableConnectedCables >= 1)
            {
                int numApparentlyUnhidableConnectedCables = numVisibleConnectedCables + numUnhidableConnectedCables;
                contextMenuUnhideCables->setText(numApparentlyUnhidableConnectedCables > 1? "Unhide Cables" : "Unhide Cable");
                contextMenuUnhideCables->setData(qVariantFromValue((void *)port));
                contextMenu.addAction(contextMenuUnhideCables);
            }
        }
 
        if (numVisibleConnectedCables >= 1)
        {
            contextMenuDeleteCables->setText(numVisibleConnectedCables > 1? "Delete Cables" : "Delete Cable");
            contextMenuDeleteCables->setData(qVariantFromValue((void *)port));
            contextMenu.addAction(contextMenuDeleteCables);
        }
    }
 
    // Customize context menu for nodes, cables, and/or comments.
    else if (item)
    {
        if (! item->isSelected())
        {
            clearSelection();
            item->setSelected(true);
        }
 
        QList<QGraphicsItem *> selectedComponents = selectedItems();
        bool onlyCommentsSelected = true;
        bool onlyCablesSelected = true;
        bool selectionContainsMissingNode = false;
        foreach (QGraphicsItem *item, selectedComponents)
        {
            if (!dynamic_cast<VuoRendererComment *>(item))
                onlyCommentsSelected = false;
 
            if (!dynamic_cast<VuoRendererCable *>(item))
                onlyCablesSelected = false;
 
            if (dynamic_cast<VuoRendererNode *>(item) && !dynamic_cast<VuoRendererNode *>(item)->getBase()->hasCompiler())
                selectionContainsMissingNode = true;
        }
 
        contextMenuDeleteSelectedSnapshot->setText(contextMenuDeleteSelected->text());
        connect(contextMenuDeleteSelectedSnapshot, &QAction::triggered, this, static_cast<void (VuoEditorComposition::*)()>(&VuoEditorComposition::deleteSelectedCompositionComponents));
 
        // Comments
        VuoRendererComment *comment = dynamic_cast<VuoRendererComment *>(item);
        if (comment)
        {
            // Option: Edit selected comments
            if (onlyCommentsSelected)
                contextMenu.addAction(contextMenuEditSelectedComments);
 
            // Option: Tint selected components(s)
            contextMenu.addMenu(getContextMenuTints(&contextMenu));
 
            contextMenu.addSeparator();
 
            // Option: Refactor selected component(s)
            contextMenu.addAction(contextMenuRefactorSelected);
 
            contextMenu.addSeparator();
 
            // Option: Delete selected components(s)
            contextMenu.addAction(contextMenuDeleteSelectedSnapshot);
        }
 
        // Cables
        VuoRendererCable *cable = dynamic_cast<VuoRendererCable *>(item);
        if (cable)
        {
            if (!renderHiddenCables)
            {
                if (onlyCablesSelected && !cable->getBase()->isPublished())
                    contextMenu.addAction(contextMenuHideSelectedCables);
            }
 
            contextMenu.addAction(contextMenuDeleteSelectedSnapshot);
        }
 
        // Nodes
        else if (dynamic_cast<VuoRendererNode *>(item))
        {
            VuoRendererNode *node = (VuoRendererNode *)item;
 
            // Input drawers
            if (dynamic_cast<VuoRendererInputDrawer *>(node) &&
                    node->getBase()->getNodeClass()->hasCompiler())
            {
                // Offer "Add/Remove Input Port" options for resizable list input drawers.
                if (dynamic_cast<VuoRendererInputListDrawer *>(node))
                {
                    contextMenuAddInputPort->setData(qVariantFromValue((void *)node));
                    contextMenuRemoveInputPort->setData(qVariantFromValue((void *)node));
 
                    int listItemCount = ((VuoCompilerMakeListNodeClass *)(node->getBase()->getNodeClass()->getCompiler()))->getItemCount();
                    contextMenuRemoveInputPort->setEnabled(listItemCount >= 1);
 
                    contextMenu.addAction(contextMenuAddInputPort);
                    contextMenu.addAction(contextMenuRemoveInputPort);
 
                    contextMenu.addSeparator();
                }
 
                // Offer "Reset" option for all input drawers.
                contextMenu.addAction(contextMenuDeleteSelectedSnapshot);
            }
 
            // Non-input-drawer nodes
            else
            {
                VuoNodeClass *nodeClass = node->getBase()->getNodeClass();
                if (nodeClass->hasCompiler() && dynamic_cast<VuoCompilerSpecializedNodeClass *>(nodeClass->getCompiler()))
                {
                    string originalGenericNodeClassName = dynamic_cast<VuoCompilerSpecializedNodeClass *>(nodeClass->getCompiler())->getOriginalGenericNodeClassName();
                    VuoCompilerNodeClass *originalGenericNodeClass = compiler->getNodeClass(originalGenericNodeClassName);
                    if (originalGenericNodeClass)
                        nodeClass = originalGenericNodeClass->getBase();
                }
 
                QString actionText, sourcePath;
                bool nodeClassIsEditable = VuoEditorUtilities::isNodeClassEditable(nodeClass, actionText, sourcePath);
                bool nodeClassIs3rdParty = nodeClass->hasCompiler() && !nodeClass->getCompiler()->isBuiltIn();
 
                int numSelectedNonAttachmentNodes = 0;
                QList<QGraphicsItem *> selectedComponents = selectedItems();
                foreach (QGraphicsItem *item, selectedComponents)
                {
                    if (dynamic_cast<VuoRendererNode *>(item) && !dynamic_cast<VuoRendererInputAttachment *>(item))
                        numSelectedNonAttachmentNodes++;
                }
 
                if ((numSelectedNonAttachmentNodes == 1) && nodeClassIsEditable)
                {
                    // Option: Edit an installed subcomposition, shader, or text-code node.
                    QAction *editAction = new QAction(NULL);
                    editAction->setText(actionText);
                    editAction->setData(qVariantFromValue(node));
                    connect(editAction, &QAction::triggered, this, &VuoEditorComposition::emitNodeSourceEditorRequested);
 
                    contextMenu.addAction(editAction);
                    contextMenu.addSeparator();
                }
 
                // Option: Rename selected node(s)
                if (node->getBase()->hasCompiler())
                    contextMenu.addAction(contextMenuRenameSelected);
 
                // Option: Tint selected component(s)
                contextMenu.addMenu(getContextMenuTints(&contextMenu));
 
                contextMenu.addSeparator();
 
                // Option: Replace selected node with a similar node
                if (numSelectedNonAttachmentNodes == 1)
                {
                    if (contextMenuChangeNode)
                        contextMenuChangeNode->deleteLater();
 
                    contextMenuChangeNode = new QMenu(VuoEditorWindow::getMostRecentActiveEditorWindow());
                    contextMenuChangeNode->setSeparatorsCollapsible(false); 
                    contextMenuChangeNode->setTitle(tr("Change To"));
 
                    populateChangeNodeMenu(contextMenuChangeNode, node, initialChangeNodeSuggestionCount);
                    if (!contextMenuChangeNode->actions().isEmpty())
                        contextMenu.addMenu(contextMenuChangeNode);
                } // End single selected node
 
                // Option: Refactor selected component(s)
                if (!selectionContainsMissingNode)
                    contextMenu.addAction(contextMenuRefactorSelected);
 
                if ((numSelectedNonAttachmentNodes == 1) && (nodeClassIsEditable || nodeClassIs3rdParty))
                {
                    // Option: Open the enclosing folder for an editable or other 3rd party node class.
                    QString modulePath = nodeClassIsEditable? sourcePath : nodeClass->getCompiler()->getModulePath().c_str();
                    if (!modulePath.isEmpty())
                    {
                        QString enclosingDirUrl = "file://" + QFileInfo(modulePath).dir().absolutePath();
                        QAction *openEnclosingFolderAction = new QAction(NULL);
                        openEnclosingFolderAction->setText("Show in Finder");
                        openEnclosingFolderAction->setData(qVariantFromValue(enclosingDirUrl));
                        connect(openEnclosingFolderAction, &QAction::triggered, static_cast<VuoEditor *>(qApp), &VuoEditor::openExternalUrlFromSenderData);
                        contextMenu.addAction(openEnclosingFolderAction);
                    }
                }
 
                if (!contextMenu.actions().empty() && !contextMenu.actions().last()->isSeparator())
                    contextMenu.addSeparator();
 
                // Option: Delete selected components(s)
                contextMenu.addAction(contextMenuDeleteSelectedSnapshot);
 
            } // End non-input-drawer nodes
        } // End nodes
    } // End nodes or cables
 
    if (!contextMenu.actions().isEmpty())
    {
        // Disable non-detached port popovers so that they don't obscure the view of the context menu.
        disableNondetachedPortPopovers();
 
        menuSelectionInProgress = true;
        contextMenu.exec(event->screenPos());
        menuSelectionInProgress = false;
    }
 
    delete contextMenuDeleteSelectedSnapshot;
}
 
void VuoEditorComposition::emitNodeSourceEditorRequested()
{
    QAction *sender = (QAction *)QObject::sender();
    VuoRendererNode *node = sender->data().value<VuoRendererNode *>();
    emit nodeSourceEditorRequested(node);
}
 
vector<string> VuoEditorComposition::getAllSpecializedTypeOptions(bool lists)
{
    vector<string> typeOptions;
 
    map<string, VuoCompilerType *> loadedTypes = compiler->getTypes();
    for (map<string, VuoCompilerType *>::iterator i = loadedTypes.begin(); i != loadedTypes.end(); ++i)
    {
        if (((!lists && !VuoType::isListTypeName(i->first)) ||
             (lists && VuoType::isListTypeName(i->first))) &&
                !VuoType::isDictionaryTypeName(i->first) &&  
                (i->first != "VuoMathExpressionList"))  
        {
            typeOptions.push_back(i->first);
        }
    }
 
    return typeOptions;
}
 
set<string> VuoEditorComposition::getRespecializationOptionsForPortInNetwork(VuoRendererPort *port)
{
    if (!port)
        return set<string>();
 
    // Find the set of connected generic ports that contains our target port.
    set<VuoPort *> connectedGenericPorts = getBase()->getCompiler()->getCorrelatedGenericPorts(port->getUnderlyingParentNode()->getBase(),
                                                                                               port->getBase(), true);
 
    // Determine the set of types compatible with all generic ports in the connected network.
    vector<string> compatibleInnerTypeNames;
    vector<string> compatibleTypeNames;
    for (VuoPort *connectedPort : connectedGenericPorts)
    {
        VuoGenericType *genericTypeFromPortClass = NULL;
        VuoCompilerNodeClass *nodeClass = connectedPort->getRenderer()->getUnderlyingParentNode()->getBase()->getNodeClass()->getCompiler();
        VuoCompilerSpecializedNodeClass *specializedNodeClass = dynamic_cast<VuoCompilerSpecializedNodeClass *>(nodeClass);
        if (specializedNodeClass)
        {
            VuoPortClass *portClass = connectedPort->getClass();
            genericTypeFromPortClass = dynamic_cast<VuoGenericType *>( specializedNodeClass->getOriginalPortType(portClass) );
        }
 
        VuoGenericType::Compatibility compatibility;
        vector<string> compatibleTypeNamesForPort = genericTypeFromPortClass->getCompatibleSpecializedTypes(compatibility);
        vector<string> innermostCompatibleTypeNamesForPort;
        for (vector<string>::iterator k = compatibleTypeNamesForPort.begin(); k != compatibleTypeNamesForPort.end(); ++k)
            innermostCompatibleTypeNamesForPort.push_back( VuoType::extractInnermostTypeName(*k) );
 
        if (! innermostCompatibleTypeNamesForPort.empty())
        {
            if (compatibleInnerTypeNames.empty())
                compatibleInnerTypeNames = innermostCompatibleTypeNamesForPort;
            else
            {
                for (int k = compatibleInnerTypeNames.size() - 1; k >= 0; --k)
                    if (find(innermostCompatibleTypeNamesForPort.begin(), innermostCompatibleTypeNamesForPort.end(), compatibleInnerTypeNames[k]) ==
                            innermostCompatibleTypeNamesForPort.end())
                        compatibleInnerTypeNames.erase(compatibleInnerTypeNames.begin() + k);
            }
        }
    }
 
    VuoCompilerNodeClass *nodeClass = port->getUnderlyingParentNode()->getBase()->getNodeClass()->getCompiler();
    VuoCompilerSpecializedNodeClass *specializedNodeClass = dynamic_cast<VuoCompilerSpecializedNodeClass *>(nodeClass);
    VuoPortClass *portClass = port->getBase()->getClass();
    VuoGenericType *genericTypeFromPortClass = dynamic_cast<VuoGenericType *>( specializedNodeClass->getOriginalPortType(portClass) );
    string typeNameForPort = genericTypeFromPortClass->getModuleKey();
 
    // Finish compiling set of compatible types in the context of the connected generic port network.
    string prefix = (VuoType::isListTypeName(typeNameForPort) ? VuoType::listTypeNamePrefix : "");
    for (vector<string>::iterator k = compatibleInnerTypeNames.begin(); k != compatibleInnerTypeNames.end(); ++k)
        compatibleTypeNames.push_back(prefix + *k);
 
    if (compatibleTypeNames.empty())
    {
        VuoGenericType::Compatibility compatibility;
        genericTypeFromPortClass->getCompatibleSpecializedTypes(compatibility);
 
        // If all types or all list types are compatible, add them to (currently empty) compatibleTypeNames.
        if (compatibility == VuoGenericType::anyType || compatibility == VuoGenericType::anyListType)
            compatibleTypeNames = getAllSpecializedTypeOptions(compatibility == VuoGenericType::anyListType);
    }
 
    return set<string>(compatibleTypeNames.begin(), compatibleTypeNames.end());
}
 
QList<QAction *>  VuoEditorComposition::getCompatibleTypesForMenu(VuoRendererPort *genericPort,
                                                           set<string> compatibleTypesInIsolation,
                                                           set<string> compatibleTypesInContext,
                                                           bool limitToNodeSet,
                                                           string nodeSetName,
                                                           QMenu *menu)
{
    QList<QAction *> actionsToAddToMenu;
 
    map<string, VuoCompilerType *> allTypes = compiler->getTypes();
    map<string, set<VuoCompilerType *> > loadedTypesForNodeSet = moduleManager->getLoadedTypesForNodeSet();
    QList<VuoCompilerType *> compatibleTypesForNodeSetDisplay;
    foreach (string typeName, compatibleTypesInIsolation)
    {
        VuoCompilerType *type = allTypes[typeName];
        if ((!limitToNodeSet || (loadedTypesForNodeSet[nodeSetName].find(type) != loadedTypesForNodeSet[nodeSetName].end())) &&
                (! VuoGenericType::isGenericTypeName(typeName)) &&
                // @todo: Re-enable listing of VuoUrl type for https://b33p.net/kosada/node/9204
                (typeName != "VuoUrl" && typeName != "VuoList_VuoUrl"
                // @todo: Re-enable listing of interaction type for https://b33p.net/kosada/node/11631
              && typeName != "VuoInteraction" && typeName != "VuoList_VuoInteraction"
              && typeName != "VuoInteractionType" && typeName != "VuoList_VuoInteractionType"
              && typeName != "VuoUuid" && typeName != "VuoList_VuoUuid"
                // Hide deprecated types.
              && typeName != "VuoIconPosition" && typeName != "VuoList_VuoIconPosition"
              && typeName != "VuoMesh" && typeName != "VuoList_VuoMesh"
              && typeName != "VuoWindowProperty" && typeName != "VuoList_VuoWindowProperty"
              && typeName != "VuoWindowReference" && typeName != "VuoList_VuoWindowReference"))
            compatibleTypesForNodeSetDisplay.append(type);
    }
 
    if (!compatibleTypesForNodeSetDisplay.isEmpty())
    {
        QMenu *contextMenuNodeSetTypes = NULL;
        QList<QAction *> actionsToAddToNodeSetSubmenu;
        bool enabledContentAdded = false;
 
        // Populate the "Specialize Type" submenu for the target node set.
        if (!nodeSetName.empty())
        {
            contextMenuNodeSetTypes = new QMenu(menu);
            contextMenuNodeSetTypes->setSeparatorsCollapsible(false); 
            contextMenuNodeSetTypes->setTitle(formatNodeSetNameForDisplay(nodeSetName.c_str()));
            contextMenuNodeSetTypes->setToolTipsVisible(true);
            actionsToAddToMenu.append(contextMenuNodeSetTypes->menuAction());
        }
 
        foreach (VuoCompilerType *type, compatibleTypesForNodeSetDisplay)
        {
            string typeName = type->getBase()->getModuleKey();
            QList<QVariant> portAndSpecializedType;
            portAndSpecializedType.append(qVariantFromValue((void *)genericPort));
            portAndSpecializedType.append(typeName.c_str());
 
            QAction *specializeAction;
            QString typeTitle = formatTypeNameForDisplay(type->getBase());
 
            // Case: Adding to the node set submenu
            if (!nodeSetName.empty())
            {
                specializeAction = new QAction(typeTitle, contextMenuNodeSetTypes);
                actionsToAddToNodeSetSubmenu.append(specializeAction);
            }
 
            // Case: Adding to the top-level action list
            else
            {
                specializeAction = new QAction(typeTitle, menu);
                actionsToAddToMenu.append(specializeAction);
            }
 
            specializeAction->setData(QVariant(portAndSpecializedType));
            specializeAction->setCheckable(true);
            specializeAction->setChecked(genericPort && (genericPort->getDataType()->getModuleKey() == type->getBase()->getModuleKey()));
 
            if (compatibleTypesInContext.find(typeName) == compatibleTypesInContext.end())
            {
                specializeAction->setEnabled(false);
                //: Appears in a tooltip when hovering over a menu item for a type specialization that's prevented by a cable connection.
                specializeAction->setToolTip(tr("To change to this type, disconnect the cable from this port and from this node's other ports of the same type."));
            }
            else
                enabledContentAdded = true;
        }
 
        if (contextMenuNodeSetTypes)
        {
            addTypeActionsToMenu(actionsToAddToNodeSetSubmenu, contextMenuNodeSetTypes);
 
            if (!enabledContentAdded)
                contextMenuNodeSetTypes->setEnabled(false);
        }
    }
 
    QList<QAction *> actionListWithPromotions = promoteSingletonsFromSubmenus(actionsToAddToMenu);
    return actionListWithPromotions;
}
 
QList<QAction *> VuoEditorComposition::promoteSingletonsFromSubmenus(QList<QAction *> actionList)
{
    QList<QAction *> modifiedActionList;
    foreach (QAction *action, actionList)
    {
        if (action->menu() && (action->menu()->actions().size() == 1))
        {
            QAction *singleSubaction = action->menu()->actions().first();
            action->menu()->removeAction(singleSubaction);
            modifiedActionList.append(singleSubaction);
        }
        else
            modifiedActionList.append(action);
    }
 
    return modifiedActionList;
}
 
void VuoEditorComposition::addTypeActionsToMenu(QList<QAction *> actionList, QMenu *menu)
{
    std::sort(actionList.begin(), actionList.end(), nodeSetMenuActionLessThan);
    foreach (QAction *action, actionList)
        menu->addAction(action);
}
 
void VuoEditorComposition::updatePopoversForActiveWindowChange(QWidget *old, QWidget *now)
{
    if (!now)
        return;
 
    VuoEditorWindow *activeWindow = VuoEditorWindow::getMostRecentActiveEditorWindow();
    if (activeWindow)
        emit compositionOnTop(activeWindow->getComposition() == this);
}
 
void VuoEditorComposition::updatePopoversForApplicationStateChange(bool active)
{
    if (ignoreApplicationStateChangeEvents)
        return;
 
    VuoEditorWindow *activeWindow = VuoEditorWindow::getMostRecentActiveEditorWindow();
    if (activeWindow && (activeWindow->getComposition() == this) && (!activeWindow->isMinimized()))
        emit applicationActive(active);
}
 
QGraphicsItem * VuoEditorComposition::findNearbyPort(QPointF scenePos, bool limitPortCollisionRange)
{
    return findNearbyComponent(scenePos, VuoEditorComposition::targetTypePort, limitPortCollisionRange);
}
 
VuoRendererNode * VuoEditorComposition::findNearbyNodeHeader(QPointF scenePos)
{
    QGraphicsItem *item = findNearbyComponent(scenePos, VuoEditorComposition::targetTypeNodeHeader);
    return dynamic_cast<VuoRendererNode *>(item);
}
 
QGraphicsItem * VuoEditorComposition::findNearbyComponent(QPointF scenePos,
                                                          targetComponentType targetType,
                                                          bool limitPortCollisionRange)
{
    // Determine which types of components to filter out of search results.
    bool ignoreCables;
    bool ignoreNodes;
    bool ignorePorts;
    bool ignoreComments;
 
    switch(targetType)
    {
        case VuoEditorComposition::targetTypePort:
        {
            ignoreCables = true;
            ignoreNodes = true;
            ignorePorts = false;
            ignoreComments = true;
            break;
        }
        case VuoEditorComposition::targetTypeNodeHeader:
        {
            ignoreCables = true;
            ignoreNodes = true;
            ignorePorts = true;
            ignoreComments = true;
            break;
        }
        default:
        {
            ignoreCables = false;
            ignoreNodes = false;
            ignorePorts = false;
            ignoreComments = false;
            break;
        }
    }
 
    // The topmost item under the cursor is not necessarily the one we will return
    // (e.g., if the cursor is positioned directly over a node but also within range
    // of one of that node's ports), but it will factor in to the decision.
    QGraphicsItem *topmostItemUnderCursor = itemAt(scenePos, views()[0]->transform());
    if (topmostItemUnderCursor && (!topmostItemUnderCursor->isEnabled()))
        topmostItemUnderCursor = NULL;
 
    for (int rectLength = componentCollisionRange/2; rectLength <= componentCollisionRange; rectLength += componentCollisionRange/2)
    {
        QRectF searchRect(scenePos.x()-0.5*rectLength, scenePos.y()-0.5*rectLength, rectLength, rectLength);
        QList<QGraphicsItem *> itemsInRange = items(searchRect);
        for (QList<QGraphicsItem *>::iterator i = itemsInRange.begin(); i != itemsInRange.end(); ++i)
        {
            if (!(*i)->isEnabled())
                continue;
 
            // Check whether we have located an unobscured "Make List" drawer drag handle.
            if (! ignoreNodes)
            {
                VuoRendererInputListDrawer *makeListDrawer = dynamic_cast<VuoRendererInputListDrawer *>(*i);
                bool makeListDragHandle =
                        (makeListDrawer &&
                         makeListDrawer->getExtendedDragHandleRect().translated(makeListDrawer->scenePos()).contains(scenePos));
                if (makeListDragHandle &&
                        ((! topmostItemUnderCursor) ||
                         (topmostItemUnderCursor == makeListDrawer) ||
                         (topmostItemUnderCursor->zValue() < makeListDrawer->zValue())))
                {
                    return makeListDrawer;
                }
            }
 
            // Check whether we have located an unobscured port.
            // Hovering within range of a port takes precedence over hovering
            // directly over that port's parent node.
            if (! ignorePorts)
            {
                VuoRendererPort *port = dynamic_cast<VuoRendererPort *>(*i);
                if (port &&
                        ((! topmostItemUnderCursor) ||
                         (topmostItemUnderCursor == port) ||
                         (topmostItemUnderCursor == port->getRenderedParentNode()) ||
                         (topmostItemUnderCursor->zValue() < port->zValue()))
                        &&
                        ((! limitPortCollisionRange) ||
                         port->getPortRect().united(port->getPortConstantTextRect()).translated(port->scenePos()).intersects(searchRect))
                        &&
                        ! port->getFunctionPort())  
                {
                    return port;
                }
            }
 
            // Check whether we have located an unobscured cable.
            if (! ignoreCables)
            {
                VuoRendererCable *cable = dynamic_cast<VuoRendererCable *>(*i);
                if (cable &&
                            ((! topmostItemUnderCursor) ||
                            (topmostItemUnderCursor == cable) ||
                            (topmostItemUnderCursor->zValue() < cable->zValue())))
                {
                    return cable;
                }
            }
 
            // Check whether we have located an unobscured comment.
            if (! ignoreComments)
            {
                VuoRendererComment *comment = dynamic_cast<VuoRendererComment *>(*i);
                if (!comment && dynamic_cast<VuoRendererComment *>((*i)->parentItem()))
                    comment = dynamic_cast<VuoRendererComment *>((*i)->parentItem());
 
                if (comment &&
                            ((! topmostItemUnderCursor) ||
                            (topmostItemUnderCursor == (*i)) ||
                            (topmostItemUnderCursor->zValue() < (*i)->zValue())))
                {
                    return comment;
                }
            }
 
            // Check whether we have located an unobscured node header.
            if (targetType == VuoEditorComposition::targetTypeNodeHeader)
            {
                VuoRendererNode *node = dynamic_cast<VuoRendererNode *>(*i);
                if (node && ! dynamic_cast<VuoRendererInputDrawer *>(node))
                {
                    QRectF headerRect = node->getOuterNodeFrameBoundingRect();
                    headerRect = node->mapToScene(headerRect).boundingRect();
                    if (headerRect.intersects(searchRect) && scenePos.y() <= headerRect.bottom())
                        return node;
                }
            }
        }
    }
 
    // Having failed to locate any other relevant components within range, return the node
    // directly under the cursor, if applicable.
    if (! ignoreNodes)
    {
        if (dynamic_cast<VuoRendererNode *>(topmostItemUnderCursor))
            return topmostItemUnderCursor;
 
        // It is possible that the item under the cursor is a port, but that it didn't meet
        // the more stringent limitPortCollisionRange requirement.  In this case, return its parent node.
        if (dynamic_cast<VuoRendererPort *>(topmostItemUnderCursor))
            return ((VuoRendererPort *)(topmostItemUnderCursor))->getRenderedParentNode();
    }
 
    return NULL;
}
 
VuoRendererPort * VuoEditorComposition::findTargetPortForCableDroppedOnNodeHeader(VuoRendererNode *node)
{
    if (! cableInProgress)
        return NULL;
 
    VuoPort *fromPort = cableInProgress->getFromPort();
    VuoPort *toPort = cableInProgress->getToPort();
    VuoPort *fixedPort = (fromPort? fromPort: toPort);
 
    if (dynamic_cast<VuoRendererPort *>(fixedPort->getRenderer())->getUnderlyingParentNode() == node)
        return NULL;
 
    return findDefaultPortForEventOnlyConnection(node, (fixedPort == fromPort));
}
 
VuoRendererPort * VuoEditorComposition::findDefaultPortForEventOnlyConnection(VuoRendererNode *node, bool inputPort)
{
    // Start with the first input or output port (other than the refresh port).
    vector<VuoRendererPort *> portList;
    int firstPortIndex;
 
    if (inputPort)
    {
        portList = node->getInputPorts();
        firstPortIndex = VuoNodeClass::unreservedInputPortStartIndex;
    }
    else
    {
        portList = node->getOutputPorts();
        firstPortIndex = VuoNodeClass::unreservedOutputPortStartIndex;
    }
 
    VuoRendererPort *targetPort = NULL;
    if (portList.size() > firstPortIndex)
    {
        targetPort = portList[firstPortIndex];
 
        // If the first input port has a wall,
        // keep moving down until we find one without a wall.
        // (Unless they all have walls, in which case stick with the first.)
        VuoRendererPort *firstPortWithoutWall = nullptr;
        for (int i = firstPortIndex; i < portList.size(); ++i)
        {
            if (portList[i]->getBase()->getClass()->getEventBlocking() != VuoPortClass::EventBlocking_Wall)
            {
                firstPortWithoutWall = portList[i];
                break;
            }
        }
        if (firstPortWithoutWall)
            targetPort = firstPortWithoutWall;
 
        // If the first input port has a drawer attached to it,
        // instead select the first input port of the drawer.
        // (Unless the drawer has no input ports, in which case don't select any port.)
        VuoRendererInputDrawer *drawer = targetPort->getAttachedInputDrawer();
        if (drawer)
        {
            portList = drawer->getInputPorts();
            if (portList.size() > firstPortIndex)
                targetPort = portList[firstPortIndex];
            else
                targetPort = NULL;
        }
 
        // If the selected input port has a collapsed type-converter node attached to it,
        // instead select the type-converter node's input port.
        VuoRendererTypecastPort *typecast = dynamic_cast<VuoRendererTypecastPort *>(targetPort);
        if (typecast)
            targetPort = typecast->getChildPort();
    }
 
    return targetPort;
}
 
QRectF VuoEditorComposition::internalItemsBoundingRect() const
{
    QRectF boundingRect;
    foreach (QGraphicsItem *item, items())
    {
        VuoRendererCable *rc = dynamic_cast<VuoRendererCable *>(item);
        if (! (rc && rc->getBase()->isPublished()))
            boundingRect |= item->sceneBoundingRect();
    }
 
    return boundingRect;
}
 
QRectF VuoEditorComposition::internalSelectedItemsBoundingRect() const
{
    QRectF boundingRect;
 
    foreach (QGraphicsItem *item, selectedItems())
    {
        VuoRendererCable *rc = dynamic_cast<VuoRendererCable *>(item);
        if (! (rc && rc->getBase()->isPublished()))
            boundingRect |= item->sceneBoundingRect();
    }
 
    return boundingRect;
}
 
QRectF VuoEditorComposition::internalSelectedItemsChildrenBoundingRect() const
{
    QRectF boundingRect;
 
    foreach (QGraphicsItem *item, selectedItems())
    {
        VuoRendererCable *rc = dynamic_cast<VuoRendererCable *>(item);
        if (! (rc && rc->getBase()->isPublished()))
            boundingRect |= item->mapToScene(item->childrenBoundingRect()).boundingRect();
 
        // Include attached drawers.
        VuoRendererNode *rn = dynamic_cast<VuoRendererNode *>(item);
        if (rn)
        {
            foreach (VuoPort *port, rn->getBase()->getInputPorts())
            {
                VuoRendererInputDrawer *drawer = (port->hasRenderer()? port->getRenderer()->getAttachedInputDrawer() : NULL);
                if (drawer)
                    boundingRect |= drawer->mapToScene(drawer->childrenBoundingRect()).boundingRect();
            }
        }
    }
 
    return boundingRect;
}
 
void VuoEditorComposition::updateInternalPortConstant(string portID, string newValue, bool updateInRunningComposition)
{
    VuoPort *port = getPortWithStaticIdentifier(portID);
    if (!port)
        return;
 
    updatePortConstant(dynamic_cast<VuoCompilerInputEventPort *>(port->getCompiler()), newValue, updateInRunningComposition);
}
 
void VuoEditorComposition::updatePublishedPortConstant(string portName, string newValue, bool updateInRunningComposition)
{
    VuoPublishedPort *port = getBase()->getPublishedInputPortWithName(portName);
    if (!port)
        return;
 
    updatePortConstant(dynamic_cast<VuoCompilerPublishedPort *>(port->getCompiler()), newValue, updateInRunningComposition);
}
 
void VuoEditorComposition::updatePortConstant(VuoCompilerPort *port, string newValue, bool updateInRunningComposition)
{
    // Internal ports
    if (dynamic_cast<VuoCompilerInputEventPort *>(port))
    {
        port->getBase()->getRenderer()->setConstant(newValue);
 
        if (updateInRunningComposition)
            updateInternalPortConstantInRunningComposition(dynamic_cast<VuoCompilerInputEventPort *>(port), newValue);
    }
 
    // Published ports
    else if (dynamic_cast<VuoCompilerPublishedPort *>(port))
    {
        dynamic_cast<VuoCompilerPublishedPort *>(port)->setInitialValue(newValue);
 
        if (updateInRunningComposition)
            updatePublishedInputPortConstantInRunningComposition(dynamic_cast<VuoPublishedPort *>(port->getBase()), newValue);
    }
}
 
void VuoEditorComposition::updateGenericPortTypes(void)
{
    getBase()->getCompiler()->updateGenericPortTypes();
    updatePortPopovers();
}
 
void VuoEditorComposition::updateFeedbackErrors(VuoRendererPort *targetPort)
{
 
    // Prevent recursive updates of feedback errors (resulting, e.g., from show()ing popovers).
    if (!errorMarkingUpdatesEnabled)
        return;
 
    errorMarkingUpdatesEnabled = false;
 
    // Remove any error annotations from the previous call to this function.
    if (errorMark)
    {
        errorMark->removeFromScene();
        errorMark = NULL;
    }
 
    disableErrorPopovers();
 
    // Check for errors.
 
    VuoCompilerIssues *issues = new VuoCompilerIssues();
    VuoCompilerCable *potentialCable = NULL;
    try
    {
        set<VuoCompilerCable *> potentialCables;
 
        if (targetPort && cableInProgress)
        {
            VuoNode *fromNode;
            VuoPort *fromPort;
            VuoNode *toNode;
            VuoPort *toPort;
            if (cableInProgress->getFromNode())
            {
                fromNode = cableInProgress->getFromNode();
                fromPort = cableInProgress->getFromPort();
                toNode = targetPort->getUnderlyingParentNode()->getBase();
                toPort = targetPort->getBase();
            }
            else
            {
                fromNode = targetPort->getUnderlyingParentNode()->getBase();
                fromPort = targetPort->getBase();
                toNode = cableInProgress->getToNode();
                toPort = cableInProgress->getToPort();
            }
            potentialCable = new VuoCompilerCable(NULL, NULL, NULL, NULL);
            potentialCable->getBase()->setFrom(fromNode, fromPort);
            potentialCable->getBase()->setTo(toNode, toPort);
            potentialCable->setAlwaysEventOnly(! cableInProgress->getRenderer()->effectivelyCarriesData() ||
                                               cableInProgress->getRenderer()->isFloatingEndpointAboveEventPort());
 
            fromPort->removeConnectedCable(potentialCable->getBase());
            toPort->removeConnectedCable(potentialCable->getBase());
            potentialCables.insert(potentialCable);
        }
 
        getBase()->getCompiler()->checkForEventFlowIssues(potentialCables, issues);
    }
    catch (const VuoCompilerException &e)
    {
    }
 
    if (! issues->isEmpty())
    {
        VUserLog("%s:      Showing error popover: %s",
            window->getWindowTitleWithoutPlaceholder().toUtf8().data(),
            issues->getShortDescription(false).c_str());
 
        this->errorMark = new VuoErrorMark();
 
        foreach (VuoCompilerIssue issue, issues->getList())
        {
            set<VuoRendererNode *> nodesToMark;
            set<VuoRendererCable *> cablesToMark;
 
            set<VuoNode *> problemNodes = issue.getNodes();
            foreach (VuoNode *node, problemNodes)
                if (node->hasRenderer())
                    nodesToMark.insert(node->getRenderer());
 
            set<VuoCable *> problemCables = issue.getCables();
            foreach (VuoCable *cable, problemCables)
            {
                VuoCable *cableToMark = (cable->getCompiler() == potentialCable ? cableInProgress : cable);
                if (cableToMark->hasRenderer())
                    cablesToMark.insert(cableToMark->getRenderer());
            }
 
            errorMark->addMarkedComponents(nodesToMark, cablesToMark);
 
            VuoErrorPopover *errorPopover = new VuoErrorPopover(issue, NULL);
            errorPopovers.insert(errorPopover);
            connect(this, &VuoEditorComposition::compositionOnTop, errorPopover, &VuoErrorPopover::setWindowLevelAndVisibility);
            connect(this, &VuoEditorComposition::applicationActive, errorPopover, &VuoErrorPopover::setWindowLevel);
 
            QRectF viewportRect = views()[0]->mapToScene(views()[0]->viewport()->rect()).boundingRect();
 
            // Place the popover near an appropriate nearby node involved in the feedback loop.
            VuoRendererNode *nearbyNode = NULL;
            if (targetPort && cableInProgress && nodesToMark.find(targetPort->getRenderedParentNode()) != nodesToMark.end())
            {
                nearbyNode = targetPort->getRenderedParentNode();
            }
            else if (! nodesToMark.empty())
            {
                VuoRendererNode *topmostVisibleNode = NULL;
                qreal topY = viewportRect.bottom();
                foreach (VuoRendererNode *node, nodesToMark)
                {
                    if (node->getProxyNode())
                        node = node->getProxyNode();
 
                    QPointF scenePos = node->scenePos();
                    if (viewportRect.contains(scenePos) && (scenePos.y() < topY))
                    {
                        topmostVisibleNode = node;
                        topY = scenePos.y();
                    }
                }
 
                if (topmostVisibleNode)
                    nearbyNode = topmostVisibleNode;
                else
                {
                    VuoRendererNode *firstMarkedNode = *nodesToMark.begin();
                    nearbyNode = (firstMarkedNode->getProxyNode()? firstMarkedNode->getProxyNode(): firstMarkedNode);
                }
            }
            else
            {
                VUserLog("Warning: no nearby node (no marked nodes).");
            }
 
            // If no nodes are known to be involved in the feedback loop, display the popover
            // in the center of the viewport.
            const QPoint offsetFromNode(0,10);
            QPoint popoverTopLeftInScene = (nearbyNode?
                                                (nearbyNode->scenePos().toPoint() +
                                                nearbyNode->getOuterNodeFrameBoundingRect().bottomLeft().toPoint() +
                                                offsetFromNode) :
                                                QPoint(viewportRect.center().x() - 0.5*errorPopover->sizeHint().width(),
                                                       viewportRect.center().y() - 0.5*errorPopover->sizeHint().height()));
 
            // If all nodes involved in the feedback loop are offscreen, display the popover at the edge
            // of the viewport closest to the feedback loop.
            const int margin = 5;
            popoverTopLeftInScene = (QPoint(fmin(popoverTopLeftInScene.x(), viewportRect.bottomRight().x() - errorPopover->sizeHint().width() - margin),
                                            fmin(popoverTopLeftInScene.y(), viewportRect.bottomRight().y() - errorPopover->sizeHint().height() - margin)));
 
            popoverTopLeftInScene = (QPoint(fmax(popoverTopLeftInScene.x(), viewportRect.topLeft().x() + margin),
                                            fmax(popoverTopLeftInScene.y(), viewportRect.topLeft().y() + margin)));
 
            QPoint popoverTopLeftInView = views()[0]->mapFromScene(popoverTopLeftInScene);
            QPoint popoverTopLeftGlobal = views()[0]->mapToGlobal(popoverTopLeftInView);
 
            errorPopover->move(popoverTopLeftGlobal);
            errorPopover->show();
            emit popoverDetached();
        }
 
        // Add error annotations to the composition.
        addItem(errorMark);
    }
    delete issues;
    delete potentialCable;
 
    errorMarkingUpdatesEnabled = true;
}
 
bool VuoEditorComposition::hasFeedbackErrors(void)
{
    return this->errorMark;
}
 
void VuoEditorComposition::repaintFeedbackErrorMarks()
{
    if (hasFeedbackErrors())
        this->errorMark->updateErrorMarkPath();
}
 
void VuoEditorComposition::buildComposition(string compositionSnapshot, const set<string> &dependenciesUninstalled)
{
    try
    {
        emit buildStarted();
 
        if (! dependenciesUninstalled.empty())
        {
            vector<string> dependenciesRemovedVec(dependenciesUninstalled.begin(), dependenciesUninstalled.end());
            string dependenciesStr = VuoStringUtilities::join(dependenciesRemovedVec, " ");
            throw VuoException("Some modules that the composition needs were uninstalled: " + dependenciesStr);
        }
 
        delete runningComposition;
        runningComposition = NULL;
        runningComposition = VuoCompilerComposition::newCompositionFromGraphvizDeclaration(compositionSnapshot, compiler);
 
        runningCompositionActiveDriver = getDriverForActiveProtocol();
        if (runningCompositionActiveDriver)
            runningCompositionActiveDriver->applyToComposition(runningComposition, compiler);
 
        string compiledCompositionPath = VuoFileUtilities::makeTmpFile(this->getBase()->getMetadata()->getName(), "bc");
        string dir, file, ext;
        VuoFileUtilities::splitPath(compiledCompositionPath, dir, file, ext);
        linkedCompositionPath = dir + file + ".dylib";
 
        compiler->setShouldPotentiallyShowSplashWindow(false);
 
        VuoCompilerIssues *issues = new VuoCompilerIssues();
        compiler->compileComposition(runningComposition, compiledCompositionPath, true, issues);
        compiler->linkCompositionToCreateDynamicLibraries(compiledCompositionPath, linkedCompositionPath, runningCompositionLibraries.get());
        delete issues;
 
        remove(compiledCompositionPath.c_str());
 
        emit buildFinished("");
    }
    catch (VuoException &e)
    {
        delete runningComposition;
        runningComposition = NULL;
 
        emit buildFinished(e.what());
        throw;
    }
}
 
bool VuoEditorComposition::isRunningThreadUnsafe(void)
{
    return runner != NULL && ! stopRequested && ! runner->isStopped();
}
 
bool VuoEditorComposition::isRunning(void)
{
    __block bool running;
    dispatch_sync(runCompositionQueue, ^{
                      running = isRunningThreadUnsafe();
                  });
    return running;
}
 
void VuoEditorComposition::run(string compositionSnapshot)
{
    VuoSubcompositionMessageRouter *subcompositionRouter = static_cast<VuoEditor *>(qApp)->getSubcompositionRouter();
 
    // If this is a subcomposition that was opened from a parent composition, now treat it as its own top-level composition.
    subcompositionRouter->unlinkSubcompositionFromNodeInSupercomposition(this);
 
    // If this is a subcomposition, tell the compiler to reload it as a node class and notify other compositions that depend on it.
    subcompositionRouter->applyToAllOtherCompositionsInstalledAsSubcompositions(this, ^void (VuoEditorComposition *subcomposition, string subcompositionPath)
    {
        compiler->overrideInstalledNodeClass(subcompositionPath, subcomposition->takeSnapshot());
    });
 
    // Tell this composition and all subcompositions opened from it to start displaying live debug info — part 1.
    subcompositionRouter->applyToAllLinkedCompositions(this, ^void (VuoEditorComposition *matchingComposition, string matchingCompositionIdentifier)
    {
        if (matchingComposition->showEventsMode)
            matchingComposition->beginDisplayingActivity();
    });
 
    stopRequested = false;
    dispatch_async(runCompositionQueue, ^{
        try
        {
           runningCompositionLibraries = std::make_shared<VuoRunningCompositionLibraries>();
 
           buildComposition(compositionSnapshot);
 
           string compositionLoaderPath = compiler->getCompositionLoaderPath();
           string compositionSourceDir = getBase()->getDirectory();
 
           runner = VuoRunner::newSeparateProcessRunnerFromDynamicLibrary(compositionLoaderPath, linkedCompositionPath, runningCompositionLibraries, compositionSourceDir, true, true);
           runner->setDelegate(this);
           runner->setRuntimeChecking(VuoIsDebugEnabled());
           runner->startPaused();
           pid_t pid = runner->getCompositionPid();
 
           // Tell this composition and all subcompositions opened from it to start displaying live debug info — part 2.
           subcompositionRouter->applyToAllLinkedCompositions(this, ^void (VuoEditorComposition *matchingComposition, string matchingCompositionIdentifier)
           {
               if (matchingComposition->showEventsMode)
                   this->runner->subscribeToEventTelemetry(matchingCompositionIdentifier);
 
               dispatch_sync(activePortPopoversQueue, ^{
                   for (auto i : matchingComposition->activePortPopovers)
                   {
                       string portID = i.first;
                       updateDataInPortPopoverFromRunningTopLevelComposition(matchingComposition, matchingCompositionIdentifier, portID);
                   }
               });
           });
 
           runner->unpause();
 
           // Focus the composition's windows (if any).
           VuoFileUtilities::focusProcess(pid, true);
        }
        catch (...) { }
    });
}
 
void VuoEditorComposition::stop(void)
{
    stopRequested = true;
    dispatch_async(runCompositionQueue, ^{
                       if (runner && ! runner->isStopped())
                       {
                           runner->stop();
                           runner->waitUntilStopped();
                       }
                       delete runner;
                       runner = NULL;
 
                       linkedCompositionPath = "";
 
                       runningCompositionLibraries = nullptr;  // release shared_ptr
 
                       delete runningComposition;
                       runningComposition = NULL;
 
                       emit stopFinished();
                   });
 
    VuoSubcompositionMessageRouter *subcompositionRouter = static_cast<VuoEditor *>(qApp)->getSubcompositionRouter();
 
    // Tell this composition and all subcompositions opened from it to stop display live debug info.
    subcompositionRouter->applyToAllLinkedCompositions(this, ^void (VuoEditorComposition *matchingComposition, string matchingCompositionIdentifier)
    {
        if (matchingComposition->showEventsMode)
            matchingComposition->stopDisplayingActivity();
 
        dispatch_sync(activePortPopoversQueue, ^{
            for (auto i : matchingComposition->activePortPopovers)
            {
                VuoPortPopover *popover = i.second;
                popover->setCompositionRunning(false);
            }
        });
    });
}
 
void VuoEditorComposition::updateRunningComposition(string oldCompositionSnapshot, string newCompositionSnapshot,
                                                    VuoCompilerCompositionDiff *diffInfo, set<string> dependenciesUninstalled)
{
    if (! diffInfo)
        diffInfo = new VuoCompilerCompositionDiff();
 
    dispatch_async(runCompositionQueue, ^{
                       if (isRunningThreadUnsafe())
                       {
                           try
                           {
                               foreach (string moduleKey, diffInfo->getModuleKeysReplaced())
                               {
                                   runningCompositionLibraries->enqueueLibraryContainingDependencyToUnload(moduleKey);
                               }
 
                               string oldBuiltCompositionSnapshot = oldCompositionSnapshot;
                               VuoCompilerDriver *previouslyActiveDriver = runningCompositionActiveDriver;
                               if (previouslyActiveDriver)
                               {
                                   VuoCompilerComposition *oldBuiltComposition = VuoCompilerComposition::newCompositionFromGraphvizDeclaration(oldCompositionSnapshot, compiler);
                                   previouslyActiveDriver->applyToComposition(oldBuiltComposition, compiler);
                                   oldBuiltCompositionSnapshot = oldBuiltComposition->getGraphvizDeclaration(getActiveProtocol());
                               }
 
                               buildComposition(newCompositionSnapshot, dependenciesUninstalled);
 
                               string compositionDiff = diffInfo->diff(oldBuiltCompositionSnapshot, runningComposition, compiler);
                               runner->replaceComposition(linkedCompositionPath, compositionDiff);
                           }
                           catch (exception &e)
                           {
                               VUserLog("Composition stopped itself: %s", e.what());
                               emit compositionStoppedItself();
                           }
                           catch (...)
                           {
                               VUserLog("Composition stopped itself.");
                               emit compositionStoppedItself();
                           }
                       }
                       else
                       {
                           dispatch_async(dispatch_get_main_queue(), ^{
                               updateCompositionsThatContainThisSubcomposition(newCompositionSnapshot);
                           });
                       }
 
                       delete diffInfo;
                   });
}
 
void VuoEditorComposition::updateCompositionsThatContainThisSubcomposition(string newCompositionSnapshot)
{
    void (^reloadSubcompositionIfUnsaved)(VuoEditorComposition *, string) = ^void (VuoEditorComposition *currComposition, string compositionPath)
    {
        compiler->overrideInstalledNodeClass(compositionPath, newCompositionSnapshot);
    };
    static_cast<VuoEditor *>(qApp)->getSubcompositionRouter()->applyIfInstalledAsSubcomposition(this, reloadSubcompositionIfUnsaved);
}
 
void VuoEditorComposition::syncInternalPortConstantInRunningComposition(string runningPortID)
{
    string constant;
    identifierCache->doForPortWithIdentifier(runningPortID, [&constant](VuoPort *port) {
        if (port->hasCompiler() && port->hasRenderer())
            constant = port->getRenderer()->getConstantAsString();
    });
 
    // Live-update the top-level composition, which may be either the composition itself or a supercomposition.
    void (^updateRunningComposition)(VuoEditorComposition *, string) = ^void (VuoEditorComposition *topLevelComposition, string thisCompositionIdentifier)
    {
        if (this == topLevelComposition)
        {
            dispatch_async(runCompositionQueue, ^{
                if (isRunningThreadUnsafe())
                {
                    json_object *constantObject = json_tokener_parse(constant.c_str());
                    runner->setInputPortValue(thisCompositionIdentifier, runningPortID, constantObject);
                }
            });
        }
    };
    static_cast<VuoEditor *>(qApp)->getSubcompositionRouter()->applyToLinkedTopLevelComposition(this, updateRunningComposition);
 
    // If this is a subcomposition, live-update all other top-level compositions that contain it.
    static_cast<VuoEditor *>(qApp)->getSubcompositionRouter()->applyIfInstalledAsSubcomposition(this, ^(VuoEditorComposition *currComposition, string subcompositionPath)
    {
        static_cast<VuoEditor *>(qApp)->getSubcompositionRouter()->applyToAllOtherTopLevelCompositions(this, ^(VuoEditorComposition *topLevelComposition)
        {
            topLevelComposition->updateInternalPortConstantInSubcompositionInstances(subcompositionPath, runningPortID, constant);
        });
    });
}
 
void VuoEditorComposition::syncPublishedPortConstantInRunningComposition(string portName)
{
    VuoPublishedPort *port = getBase()->getPublishedInputPortWithName(portName);
    if (!(port && port->hasCompiler()))
        return;
 
    string constant = dynamic_cast<VuoCompilerPublishedPort *>(port->getCompiler())->getInitialValue();
    updatePublishedInputPortConstantInRunningComposition(port, constant);
}
 
void VuoEditorComposition::updateInternalPortConstantInRunningComposition(VuoCompilerInputEventPort *port, string constant)
{
    string runningPortIdentifier = identifierCache->getIdentifierForPort(port->getBase());
    if (runningPortIdentifier.empty())
        return;
 
    // Live-update the top-level composition, which may be either the composition itself or a supercomposition.
    void (^updateRunningComposition)(VuoEditorComposition *, string) = ^void (VuoEditorComposition *topLevelComposition, string thisCompositionIdentifier)
    {
        if (this == topLevelComposition)
        {
            dispatch_async(runCompositionQueue, ^{
                if (isRunningThreadUnsafe())
                {
                    json_object *constantObject = json_tokener_parse(constant.c_str());
                    runner->setInputPortValue(thisCompositionIdentifier, runningPortIdentifier, constantObject);
                }
            });
        }
    };
    static_cast<VuoEditor *>(qApp)->getSubcompositionRouter()->applyToLinkedTopLevelComposition(this, updateRunningComposition);
 
    // If this is a subcomposition, live-update all other top-level compositions that contain it.
    static_cast<VuoEditor *>(qApp)->getSubcompositionRouter()->applyIfInstalledAsSubcomposition(this, ^(VuoEditorComposition *currComposition, string subcompositionPath)
    {
        static_cast<VuoEditor *>(qApp)->getSubcompositionRouter()->applyToAllOtherTopLevelCompositions(this, ^(VuoEditorComposition *topLevelComposition)
        {
            topLevelComposition->updateInternalPortConstantInSubcompositionInstances(subcompositionPath, runningPortIdentifier, constant);
        });
    });
}
 
void VuoEditorComposition::updateInternalPortConstantInSubcompositionInstances(string subcompositionPath, string portIdentifier, string constant)
{
    dispatch_async(runCompositionQueue, ^{
                       if (isRunningThreadUnsafe())
                       {
                           json_object *constantObject = json_tokener_parse(constant.c_str());
                           set<string> subcompositionIdentifiers = moduleManager->findInstancesOfNodeClass(subcompositionPath);
                           foreach (string subcompositionIdentifier, subcompositionIdentifiers)
                           {
                               runner->setInputPortValue(subcompositionIdentifier, portIdentifier, constantObject);
                           }
                       }
                   });
}
 
void VuoEditorComposition::updatePublishedInputPortConstantInRunningComposition(VuoPublishedPort *port, string constant)
{
    dispatch_async(runCompositionQueue, ^{
                       if (isRunningThreadUnsafe())
                       {
                           VuoRunner::Port *publishedPort = runner->getPublishedInputPortWithName(port->getClass()->getName());
                           if (publishedPort)
                           {
                               json_object *constantObject = json_tokener_parse(constant.c_str());
                               map<VuoRunner::Port *, json_object *> m;
                               m[publishedPort] = constantObject;
                               runner->setPublishedInputPortValues(m);
                           }
                       }
                   });
}
 
 
QAction * VuoEditorComposition::getContextMenuDeleteSelectedAction()
{
    return contextMenuDeleteSelected;
}
 
QMenu * VuoEditorComposition::getContextMenuTints(QMenu *parent)
{
    // Workaround for a bug in Qt 5.1.0-beta1 (https://b33p.net/kosada/node/5096).
    // For now, this recreates the context menu rather than accessing a data member.
    QMenu *contextMenuTints = new QMenu(parent);
    contextMenuTints->setSeparatorsCollapsible(false); 
    contextMenuTints->setTitle(tr("Tint"));
    foreach (QAction *tintAction, contextMenuTintActions)
        contextMenuTints->addAction(tintAction);
    contextMenuTints->insertSeparator(contextMenuTintActions.last());
 
    return contextMenuTints;
}
 
void VuoEditorComposition::expandChangeNodeMenu()
{
    QAction *sender = (QAction *)QObject::sender();
    VuoRendererNode *node = static_cast<VuoRendererNode *>(sender->data().value<void *>());
 
    // If the menu hasn't been expanded previously, expand it enough now to fill
    // the available vertical screenspace.
    int currentMatchesListed = contextMenuChangeNode->actions().size()-1; // -1 to account for the "More…" row
    if (currentMatchesListed <= initialChangeNodeSuggestionCount)
    {
        int availableVerticalSpace = QApplication::desktop()->availableGeometry(VuoEditorWindow::getMostRecentActiveEditorWindow()).height();
        int verticalSpacePerItem = 21; // menu row height in pixels
        // Estimate the number of matches that will fit within the screen without scrolling:
        // -1 to account for a possible extra "More…" row;
        // -1 wiggle room to match observations
        int targetMatches = availableVerticalSpace/verticalSpacePerItem - 2;
 
        populateChangeNodeMenu(contextMenuChangeNode, node, targetMatches);
    }
 
    // If the menu has already been expanded once, don't impose any cap on listed matches this time.
    else
        populateChangeNodeMenu(contextMenuChangeNode, node, 0);
 
    contextMenuChangeNode->exec();
}
 
void VuoEditorComposition::populateChangeNodeMenu(QMenu *menu, VuoRendererNode *node, int matchLimit)
{
    menu->clear();
 
    if (!node)
        return;
 
    map<string, VuoCompilerNodeClass *> nodeClassesMap = compiler->getNodeClasses();
    vector<VuoCompilerNodeClass *> loadedNodeClasses;
    for (map<string, VuoCompilerNodeClass *>::iterator i = nodeClassesMap.begin(); i != nodeClassesMap.end(); ++i)
        loadedNodeClasses.push_back(i->second);
    VuoNodeLibrary::cullHiddenNodeClasses(loadedNodeClasses);
 
    vector<string> bestMatches;
    map<string, double> matchScores;
    matchScores[""] = 0;
 
    int targetMatchCount = (matchLimit > 0? matchLimit : loadedNodeClasses.size());
    for (int i = 0; i < targetMatchCount; ++i)
        bestMatches.push_back("");
 
    // Maintain a priority queue with the @c targetMatchCount best matches.
    bool overflow = false;
 
    VuoNodeClass *nodeClass = node->getBase()->getNodeClass();
    string originalGenericNodeClassName;
    if (nodeClass->hasCompiler() && dynamic_cast<VuoCompilerSpecializedNodeClass *>(nodeClass->getCompiler()))
        originalGenericNodeClassName = dynamic_cast<VuoCompilerSpecializedNodeClass *>(nodeClass->getCompiler())->getOriginalGenericNodeClassName();
    else
        originalGenericNodeClassName = nodeClass->getClassName();
 
    foreach (VuoCompilerNodeClass *loadedNodeClass, loadedNodeClasses)
    {
        string loadedNodeClassName = loadedNodeClass->getBase()->getClassName();
        if (loadedNodeClassName == originalGenericNodeClassName)
            continue;
 
        bool canSwapNondestructively = canSwapWithoutBreakingCables(node, loadedNodeClass->getBase());
        double matchScore = (canSwapNondestructively? calculateNodeSimilarity(nodeClass, loadedNodeClass->getBase()) : 0);
        int highestIndexWithCompetitiveScore = -1;
        for (int i = targetMatchCount-1; (i >= 0) && (highestIndexWithCompetitiveScore == -1); --i)
            if (matchScore <= matchScores[bestMatches[i] ])
                highestIndexWithCompetitiveScore = i;
 
        if (highestIndexWithCompetitiveScore < targetMatchCount-1)
        {
            if (matchScores[bestMatches[targetMatchCount-1] ] > 0)
                overflow = true;
 
            for (int j = targetMatchCount-2; j > highestIndexWithCompetitiveScore; --j)
                bestMatches[j+1] = bestMatches[j];
 
            bestMatches[highestIndexWithCompetitiveScore+1] = loadedNodeClassName;
            matchScores[loadedNodeClassName] = matchScore;
        }
    }
 
    for (int i = 0; i < targetMatchCount; ++i)
    {
        if (matchScores[bestMatches[i] ] > 0)
        {
            // Disambiguate between identical node titles using node class names.
            QString matchDisplayText = compiler->getNodeClass(bestMatches[i])->getBase()->getDefaultTitle().c_str();
            if (matchDisplayText == nodeClass->getDefaultTitle().c_str())
                matchDisplayText += QString(" (%1)").arg(bestMatches[i].c_str());
 
            QAction *changeAction = menu->addAction(matchDisplayText);
 
            QList<QVariant> currentNodeAndNewClass;
            currentNodeAndNewClass.append(qVariantFromValue((void *)node));
            currentNodeAndNewClass.append(bestMatches[i].c_str());
            changeAction->setData(QVariant(currentNodeAndNewClass));
            connect(changeAction, &QAction::triggered, this, &VuoEditorComposition::swapNode);
        }
    }
 
    if (overflow)
    {
        //: Appears at the bottom of the "Change Node" menu when there are more options than can fit onscreen.
        QAction *showMoreAction = menu->addAction(tr("More…"));
        showMoreAction->setData(qVariantFromValue(static_cast<void *>(node)));
        connect(showMoreAction, &QAction::triggered, this, &VuoEditorComposition::expandChangeNodeMenu);
    }
}
 
bool VuoEditorComposition::canSwapWithoutBreakingCables(VuoRendererNode *origNode, VuoNodeClass *newNodeClass)
{
    // Inventory required input port types (connected data inputs) in the node to be replaced.
    map<string, int> requiredInputs;
    bool inputEventSourceRequired = false;
    foreach (VuoRendererPort *inputPort, origNode->getInputPorts())
    {
        bool hasDrawerWithNoIncomingCables = false;
        bool hasDrawerWithNoIncomingDataCables = false;
 
        if (inputPort->getDataType() && inputPort->effectivelyHasConnectedDataCable(true))
        {
            VuoRendererInputDrawer *inputDrawer = inputPort->getAttachedInputDrawer();
            if (inputDrawer)
            {
                hasDrawerWithNoIncomingCables = true;
                hasDrawerWithNoIncomingDataCables = true;
                vector<VuoRendererPort *> childPorts = inputDrawer->getDrawerPorts();
                foreach (VuoRendererPort *childPort, childPorts)
                {
                    if (childPort->getBase()->getConnectedCables(true).size() > 0)
                        hasDrawerWithNoIncomingCables = false;
                    if (childPort->effectivelyHasConnectedDataCable(true))
                        hasDrawerWithNoIncomingDataCables = false;
                }
            }
 
            string typeKey = inputPort->getDataType()->getModuleKey();
            if (!hasDrawerWithNoIncomingDataCables)
            {
                // @todo https://b33p.net/kosada/node/16966, https://b33p.net/kosada/node/16967 :
                // Accommodate generic types.
                if (VuoGenericType::isGenericTypeName(typeKey))
                    return false;
 
                requiredInputs[typeKey] = ((requiredInputs.find(typeKey) == requiredInputs.end())? 1 : requiredInputs[typeKey]+1);
            }
        }
 
        bool hasIncomingCables = (inputPort->getBase()->getConnectedCables(true).size() > 0);
        if (hasIncomingCables && !hasDrawerWithNoIncomingCables)
            inputEventSourceRequired = true;
    }
 
    // Inventory required output port types (connected data outputs) in the node to be replaced.
    map<string, int> requiredOutputs;
    bool outputEventSourceRequired = false;
    foreach (VuoRendererPort *outputPort, origNode->getOutputPorts())
    {
        if (outputPort->getDataType() && outputPort->effectivelyHasConnectedDataCable(true))
        {
            string typeKey = outputPort->getDataType()->getModuleKey();
 
            // @todo https://b33p.net/kosada/node/16966, https://b33p.net/kosada/node/16967 :
            // Accommodate generic types.
            if (VuoGenericType::isGenericTypeName(typeKey))
                return false;
 
            requiredOutputs[typeKey] = ((requiredOutputs.find(typeKey) == requiredOutputs.end())? 1 : requiredOutputs[typeKey]+1);
        }
 
        if (outputPort->getBase()->getConnectedCables(true).size() > 0)
            outputEventSourceRequired = true;
    }
 
    // Inventory available input port types in the candidate replacement node.
    bool inputEventSourceAvailable = false;
    map<string, int> availableInputs;
    foreach (VuoPortClass *inputPortClass, newNodeClass->getInputPortClasses())
    {
        VuoType *dataType = (inputPortClass->hasCompiler()?
                                 static_cast<VuoCompilerPortClass *>(inputPortClass->getCompiler())->getDataVuoType() : NULL);
        if (dataType)
        {
            string typeKey = dataType->getModuleKey();
            availableInputs[typeKey] = ((availableInputs.find(typeKey) == availableInputs.end())? 1 : availableInputs[typeKey]+1);
        }
    }
 
    if (newNodeClass->getInputPortClasses().size() > VuoNodeClass::unreservedInputPortStartIndex)
        inputEventSourceAvailable = true;
 
    // Inventory available output port types in the candidate replacement node.
    bool outputEventSourceAvailable = false;
    map<string, int> availableOutputs;
    foreach (VuoPortClass *outputPortClass, newNodeClass->getOutputPortClasses())
    {
        VuoType *dataType = (outputPortClass->hasCompiler()?
                                 static_cast<VuoCompilerPortClass *>(outputPortClass->getCompiler())->getDataVuoType() : NULL);
        if (dataType)
        {
            string typeKey = dataType->getModuleKey();
            availableOutputs[typeKey] = ((availableOutputs.find(typeKey) == availableOutputs.end())? 1 : availableOutputs[typeKey]+1);
        }
    }
 
    if (newNodeClass->getOutputPortClasses().size() > VuoNodeClass::unreservedOutputPortStartIndex)
        outputEventSourceAvailable = true;
 
    // Check whether the candidate replacement node meets input data requirements.
    for (std::map<string,int>::iterator it=requiredInputs.begin(); it!=requiredInputs.end(); ++it)
    {
        string typeKey = it->first;
        int typeRequiredCount = it->second;
        if (availableInputs[typeKey] < typeRequiredCount)
            return false;
    }
 
    // Check whether the candidate replacement node meets output data requirements.
    for (std::map<string,int>::iterator it=requiredOutputs.begin(); it!=requiredOutputs.end(); ++it)
    {
        string typeKey = it->first;
        int typeRequiredCount = it->second;
        if (availableOutputs[typeKey] < typeRequiredCount)
            return false;
    }
 
    if (inputEventSourceRequired && !inputEventSourceAvailable)
        return false;
 
    if (outputEventSourceRequired && !outputEventSourceAvailable)
        return false;
 
    return true;
}
 
bool VuoEditorComposition::isPortCurrentlyRevertible(VuoRendererPort *port)
{
    // If this port is not a specialization of a formerly generic port, then it cannot be reverted.
    VuoCompilerNodeClass *nodeClass = port->getUnderlyingParentNode()->getBase()->getNodeClass()->getCompiler();
    VuoCompilerSpecializedNodeClass *specializedNodeClass = dynamic_cast<VuoCompilerSpecializedNodeClass *>(nodeClass);
 
    if (!specializedNodeClass)
        return false;
 
    VuoPortClass *portClass = port->getBase()->getClass();
    VuoGenericType *originalGenericType = dynamic_cast<VuoGenericType *>(specializedNodeClass->getOriginalPortType(portClass));
    if (!originalGenericType)
        return false;
 
    // If this port belongs to an attachment connected to a port that is not revertible, then
    // this port cannot be reverted, either.
    VuoRendererInputAttachment *attachment = dynamic_cast<VuoRendererInputAttachment *>(port->getUnderlyingParentNode());
    if (attachment)
    {
        VuoPort *hostPort = attachment->getUnderlyingHostPort();
        if (hostPort && (!isPortCurrentlyRevertible(hostPort->getRenderer())))
            return false;
    }
 
    return true;
}
 
VuoRendererPublishedPort * VuoEditorComposition::publishInternalPort(VuoPort *port, bool forceEventOnlyPublication, string name, VuoType *type, bool attemptMerge, bool *mergePerformed)
{
    string publishedPortName = ((! name.empty())?
                                    name :
                                    VuoRendererPort::sanitizePortIdentifier(port->getRenderer()->getPortNameToRenderWhenDisplayed().c_str()).toUtf8().constData());
    bool isPublishedInput = port->getRenderer()->getInput();
    VuoType *portType = port->getRenderer()->getDataType();
    VuoPublishedPort *publishedPort = NULL;
 
    // If merging is enabled:
    // Check whether this composition has a pre-existing externally visible published port
    // that has the requested name and type and that can accommodate the newly published internal port.
    // If so, add this internal port as a connected port for the existing alias.
    bool performedMerge = false;
    if (attemptMerge)
    {
        publishedPort = (isPublishedInput ?
                             getBase()->getPublishedInputPortWithName(publishedPortName) :
                             getBase()->getPublishedOutputPortWithName(publishedPortName));
 
        if (publishedPort && dynamic_cast<VuoRendererPublishedPort *>(publishedPort->getRenderer())->canAccommodateInternalPort(port->getRenderer(), forceEventOnlyPublication))
        {
            if (isPublishedInput && portType && type && !forceEventOnlyPublication)
            {
                VuoCompilerPublishedPort *publishedInputPort = static_cast<VuoCompilerPublishedPort *>( publishedPort->getCompiler() );
                updatePortConstant(static_cast<VuoCompilerInputEventPort *>(port->getCompiler()),
                                   publishedInputPort->getInitialValue(),
                                   false);
            }
 
            performedMerge = true;
        }
    }
 
 
    // Otherwise, create a new externally visible published port with a unique name derived from
    // the specified name, containing the current port as its lone connected internal port.
    if (! performedMerge)
    {
        publishedPort = static_cast<VuoPublishedPort *>(VuoCompilerPublishedPort::newPort(getUniquePublishedPortName(publishedPortName), type)->getBase());
        if (isPublishedInput && type)
        {
            VuoCompilerPublishedPort *publishedInputPort = static_cast<VuoCompilerPublishedPort *>( publishedPort->getCompiler() );
            publishedInputPort->setInitialValue(port->getRenderer()->getConstantAsString());
        }
    }
 
    addPublishedPort(publishedPort, isPublishedInput);
 
    VuoRendererPublishedPort *rendererPublishedPort = (publishedPort->hasRenderer()?
                                                              dynamic_cast<VuoRendererPublishedPort *>(publishedPort->getRenderer()) :
                                                              createRendererForPublishedPortInComposition(publishedPort, isPublishedInput));
 
    VuoCable *existingPublishedCable = port->getCableConnecting(publishedPort);
 
    if (! existingPublishedCable)
    {
        VuoCable *publishedCable = createPublishedCable(publishedPort, port, forceEventOnlyPublication);
        addCable(publishedCable);
    }
 
    if (mergePerformed != NULL)
        *mergePerformed = performedMerge;
 
    return rendererPublishedPort;
}
 
VuoCable * VuoEditorComposition::createPublishedCable(VuoPort *externalPort, VuoPort *internalPort, bool forceEventOnlyPublication)
{
    VuoCable *publishedCable = NULL;
    bool creatingPublishedInputCable = internalPort->getRenderer()->getInput();
 
    if (creatingPublishedInputCable)
    {
        // If creating a published input cable, it will need to have an associated VuoCompilerCable.
        VuoPort *fromPort = externalPort;
        VuoNode *fromNode = this->publishedInputNode;
 
        VuoPort *toPort = internalPort;
        VuoNode *toNode = internalPort->getRenderer()->getUnderlyingParentNode()->getBase();
 
        publishedCable = (new VuoCompilerCable(NULL,
                                              NULL,
                                              toNode->getCompiler(),
                                              (VuoCompilerPort *)(toPort->getCompiler())))->getBase();
        publishedCable->setFrom(fromNode, fromPort);
    }
 
    else
    {
        // If creating a published output cable, it will need to have an associated VuoCompilerCable
        // even though we don't currently construct a VuoCompilerNode for the published output node.
        VuoPort *fromPort = internalPort;
        VuoNode *fromNode = internalPort->getRenderer()->getUnderlyingParentNode()->getBase();
 
        VuoPort *toPort = externalPort;
        VuoNode *toNode = this->publishedOutputNode;
 
        publishedCable = (new VuoCompilerCable(fromNode->getCompiler(),
                                              (VuoCompilerPort *)(fromPort->getCompiler()),
                                              NULL,
                                               NULL))->getBase();
        publishedCable->setTo(toNode, toPort);
    }
 
    if (forceEventOnlyPublication)
        publishedCable->getCompiler()->setAlwaysEventOnly(true);
 
    return publishedCable;
}
 
void VuoEditorComposition::addActiveProtocol(VuoProtocol *protocol, bool useUndoStack)
{
    vector<VuoPublishedPort *> publishedPortsToAdd;
    map<VuoPublishedPort *, string> publishedPortsToRename;
 
    // Remove the previously active protocol.
    VuoProtocol *previousActiveProtocol = this->activeProtocol;
    bool removingPreviousProtocol = previousActiveProtocol && (previousActiveProtocol != protocol);
 
    bool portChangesMadeDuringProtocolRemoval = false;
    if (removingPreviousProtocol)
         portChangesMadeDuringProtocolRemoval = removeActiveProtocol(previousActiveProtocol, protocol);
 
    if (portChangesMadeDuringProtocolRemoval && !useUndoStack)
    {
        VUserLog("Warning: Unexpected combination: Removing protocol ports, but useUndoStack=false");
        useUndoStack = true;
    }
 
    // Add the newly active protocol.
    this->activeProtocol = protocol;
    if (!protocol)
        return;
 
    vector<pair<string, string> > protocolInputs = protocol->getInputPortNamesAndTypes();
    for (vector<pair<string, string> >::iterator i = protocolInputs.begin(); i != protocolInputs.end(); ++i)
    {
        string portName = i->first;
        string portType = i->second;
 
        bool compositionHadCompatiblePort = false;
        VuoPublishedPort *preexistingPublishedPort = getBase()->getPublishedInputPortWithName(portName);
        if (preexistingPublishedPort)
        {
            VuoType *preexistingType = static_cast<VuoCompilerPortClass *>(preexistingPublishedPort->getClass()->getCompiler())->getDataVuoType();
 
            bool portTypesMatch = ((preexistingType && (preexistingType->getModuleKey() == portType)) ||
                               (!preexistingType && (portType == "")));
            if (portTypesMatch)
            {
                compositionHadCompatiblePort = true;
                preexistingPublishedPort->setProtocolPort(true);
            }
            else
            {
                compositionHadCompatiblePort = false;
                publishedPortsToRename[preexistingPublishedPort] = getUniquePublishedPortName(getNonProtocolVariantForPortName(portName));
            }
        }
 
        if (!compositionHadCompatiblePort)
        {
            VuoType *type = compiler->getType(portType)->getBase();
            VuoPublishedPort *publishedPort = static_cast<VuoPublishedPort *>(VuoCompilerPublishedPort::newPort(getUniquePublishedPortName(portName), type)->getBase());
            publishedPort->setProtocolPort(true);
 
            if (!useUndoStack)
                addPublishedPort(publishedPort, true);
            else
                publishedPortsToAdd.push_back(publishedPort);
 
            createRendererForPublishedPortInComposition(publishedPort, true);
        }
    }
 
    vector<pair<string, string> > protocolOutputs = protocol->getOutputPortNamesAndTypes();
    for (vector<pair<string, string> >::iterator i = protocolOutputs.begin(); i != protocolOutputs.end(); ++i)
    {
        string portName = i->first;
        string portType = i->second;
 
        bool compositionHadCompatiblePort = false;
        VuoPublishedPort *preexistingPublishedPort = getBase()->getPublishedOutputPortWithName(portName);
        if (preexistingPublishedPort)
        {
            VuoType *preexistingType = static_cast<VuoCompilerPortClass *>(preexistingPublishedPort->getClass()->getCompiler())->getDataVuoType();
            bool portTypesMatch = ((preexistingType && (preexistingType->getModuleKey() == portType)) ||
                               (!preexistingType && (portType == "")));
            if (portTypesMatch)
            {
                compositionHadCompatiblePort = true;
                preexistingPublishedPort->setProtocolPort(true);
            }
            else
            {
                compositionHadCompatiblePort = false;
                publishedPortsToRename[preexistingPublishedPort] = getUniquePublishedPortName(getNonProtocolVariantForPortName(portName));
            }
        }
 
        if (!compositionHadCompatiblePort)
        {
            VuoType *type = compiler->getType(portType)->getBase();
            VuoPublishedPort *publishedPort = static_cast<VuoPublishedPort *>(VuoCompilerPublishedPort::newPort(getUniquePublishedPortName(portName), type)->getBase());
            publishedPort->setProtocolPort(true);
 
            if (!useUndoStack)
                addPublishedPort(publishedPort, false);
            else
                publishedPortsToAdd.push_back(publishedPort);
 
            createRendererForPublishedPortInComposition(publishedPort, false);
        }
    }
 
    if (useUndoStack)
    {
        bool undoStackMacroBegunAlready = (removingPreviousProtocol && portChangesMadeDuringProtocolRemoval);
        if (!publishedPortsToRename.empty() || !publishedPortsToAdd.empty() || undoStackMacroBegunAlready)
        {
            set<VuoPublishedPort *> publishedPortsToRemove;
            bool beginUndoStackMacro = !undoStackMacroBegunAlready;
            bool endUndoStackMacro = true;
            emit protocolPortChangesRequested(publishedPortsToRename, publishedPortsToRemove, publishedPortsToAdd, beginUndoStackMacro, endUndoStackMacro);
        }
    }
 
    emit activeProtocolChanged();
}
 
string VuoEditorComposition::getNonProtocolVariantForPortName(string portName)
{
    string modifiedPortName = portName;
    if (modifiedPortName.length() > 0)
        modifiedPortName[0] = toupper(modifiedPortName[0]);
    modifiedPortName = "some" + modifiedPortName;
 
    return modifiedPortName;
}
 
bool VuoEditorComposition::removeActiveProtocol(VuoProtocol *protocol, VuoProtocol *replacementProtocol)
{
    removeActiveProtocolWithoutModifyingPorts(protocol);
 
    set<VuoPublishedPort *> publishedPortsToRemove;
    map<VuoPublishedPort *, string> publishedPortsToRename;
 
    vector<pair<string, string> > protocolInputs = protocol->getInputPortNamesAndTypes();
    for (vector<pair<string, string> >::iterator i = protocolInputs.begin(); i != protocolInputs.end(); ++i)
    {
        string portName = i->first;
        string portType = i->second;
 
        VuoPublishedPort *preexistingPublishedPort = getBase()->getPublishedInputPortWithName(portName);
        if (preexistingPublishedPort)
        {
            bool portCompatibleAcrossProtocolTransition = false;
            if (replacementProtocol)
            {
                vector<pair<string, string> > protocolInputs = replacementProtocol->getInputPortNamesAndTypes();
                for (vector<pair<string, string> >::iterator i = protocolInputs.begin(); i != protocolInputs.end() && !portCompatibleAcrossProtocolTransition; ++i)
                {
                    string replacementPortName = i->first;
                    string replacementPortType = i->second;
 
                    if ((portName == replacementPortName) && (portType == replacementPortType))
                        portCompatibleAcrossProtocolTransition = true;
                }
            }
 
            if (preexistingPublishedPort->getConnectedCables(true).empty())
                publishedPortsToRemove.insert(preexistingPublishedPort);
            else if (!portCompatibleAcrossProtocolTransition)
                publishedPortsToRename[preexistingPublishedPort] = getUniquePublishedPortName(getNonProtocolVariantForPortName(portName));
        }
    }
 
    vector<pair<string, string> > protocolOutputs = protocol->getOutputPortNamesAndTypes();
    for (vector<pair<string, string> >::iterator i = protocolOutputs.begin(); i != protocolOutputs.end(); ++i)
    {
        string portName = i->first;
        string portType = i->second;
 
        VuoPublishedPort *preexistingPublishedPort = getBase()->getPublishedOutputPortWithName(portName);
        if (preexistingPublishedPort)
        {
            bool portCompatibleAcrossProtocolTransition = false;
            if (replacementProtocol)
            {
                vector<pair<string, string> > protocolOutputs = replacementProtocol->getOutputPortNamesAndTypes();
                for (vector<pair<string, string> >::iterator i = protocolOutputs.begin(); i != protocolOutputs.end() && !portCompatibleAcrossProtocolTransition; ++i)
                {
                    string replacementPortName = i->first;
                    string replacementPortType = i->second;
 
                    if ((portName == replacementPortName) && (portType == replacementPortType))
                        portCompatibleAcrossProtocolTransition = true;
                }
            }
 
            if (preexistingPublishedPort->getConnectedCables(true).empty())
                publishedPortsToRemove.insert(preexistingPublishedPort);
            else if (!portCompatibleAcrossProtocolTransition)
                publishedPortsToRename[preexistingPublishedPort] = getUniquePublishedPortName(getNonProtocolVariantForPortName(portName));
        }
    }
 
    // If we are removing any ports, the composition will no longer be deemed to adhere to the
    // removed protocol when it is re-opened, so there is no need to re-name any other ports.
    if (!publishedPortsToRemove.empty())
        publishedPortsToRename.clear();
 
    bool portChangesRequired = (!publishedPortsToRename.empty() || !publishedPortsToRemove.empty());
    if (portChangesRequired)
    {
        vector<VuoPublishedPort *> publishedPortsToAdd;
        bool beginUndoStackMacro = true;
        bool endUndoStackMacro = !replacementProtocol;
        emit protocolPortChangesRequested(publishedPortsToRename, publishedPortsToRemove, publishedPortsToAdd, beginUndoStackMacro, endUndoStackMacro);
    }
 
    emit activeProtocolChanged();
 
    return portChangesRequired;
}
 
void VuoEditorComposition::removeActiveProtocolWithoutModifyingPorts(VuoProtocol *protocol)
{
    if ((activeProtocol != protocol) || !activeProtocol)
        return;
 
    activeProtocol = NULL;
 
    vector<pair<string, string> > protocolInputs = protocol->getInputPortNamesAndTypes();
    for (vector<pair<string, string> >::iterator i = protocolInputs.begin(); i != protocolInputs.end(); ++i)
    {
        string portName = i->first;
        string portType = i->second;
 
        VuoPublishedPort *preexistingPublishedPort = getBase()->getPublishedInputPortWithName(portName);
        if (preexistingPublishedPort)
            preexistingPublishedPort->setProtocolPort(false);
    }
 
    vector<pair<string, string> > protocolOutputs = protocol->getOutputPortNamesAndTypes();
    for (vector<pair<string, string> >::iterator i = protocolOutputs.begin(); i != protocolOutputs.end(); ++i)
    {
        string portName = i->first;
        string portType = i->second;
 
        VuoPublishedPort *preexistingPublishedPort = getBase()->getPublishedOutputPortWithName(portName);
        if (preexistingPublishedPort)
            preexistingPublishedPort->setProtocolPort(false);
    }
 
    emit activeProtocolChanged();
}
 
VuoProtocol * VuoEditorComposition::getActiveProtocol()
{
    return activeProtocol;
}
 
VuoCompilerDriver * VuoEditorComposition::getDriverForActiveProtocol()
{
    if (!activeProtocol)
        return NULL;
 
    return static_cast<VuoEditor *>(qApp)->getBuiltInDriverForProtocol(activeProtocol);
}
 
void VuoEditorComposition::addPublishedPort(VuoPublishedPort *publishedPort, bool isPublishedInput, bool shouldUpdateUi)
{
    VuoRendererComposition::addPublishedPort(publishedPort, isPublishedInput, compiler);
 
    identifierCache->addPublishedPortToCache(publishedPort);
 
    if (shouldUpdateUi)
        emit publishedPortModified();
}
 
int VuoEditorComposition::removePublishedPort(VuoPublishedPort *publishedPort, bool isPublishedInput, bool shouldUpdateUi)
{
    // @todo: Allow multiple simultaneous active protocols. https://b33p.net/kosada/node/9585
    if (shouldUpdateUi && publishedPort->isProtocolPort())
        removeActiveProtocolWithoutModifyingPorts(getActiveProtocol());
 
    int removalResult = VuoRendererComposition::removePublishedPort(publishedPort, isPublishedInput, compiler);
 
    if (shouldUpdateUi)
        emit publishedPortModified();
 
    return removalResult;
}
 
void VuoEditorComposition::setPublishedPortName(VuoRendererPublishedPort *publishedPort, string name)
{
    // @todo: Allow multiple simultaneous active protocols. https://b33p.net/kosada/node/9585
    if (dynamic_cast<VuoPublishedPort *>(publishedPort->getBase())->isProtocolPort())
        removeActiveProtocolWithoutModifyingPorts(getActiveProtocol());
 
    VuoRendererComposition::setPublishedPortName(publishedPort, name, compiler);
 
    identifierCache->addPublishedPortToCache( static_cast<VuoPublishedPort *>(publishedPort->getBase()) );
 
    emit publishedPortModified();
}
 
void VuoEditorComposition::highlightEligibleEndpointsForCable(VuoCable *cable)
{
    bool eventOnlyConnection = cable->hasRenderer() && !cable->getRenderer()->effectivelyCarriesData();
    VuoRendererPort *fixedPort = NULL;
 
    if ((cable->getFromNode()) && (cable->getFromPort()) && (! (cable->getToNode())) & (! (cable->getToPort())))
        fixedPort = cable->getFromPort()->getRenderer();
 
    else if ((! (cable->getFromNode())) && (! (cable->getFromPort())) && (cable->getToNode()) && (cable->getToPort()))
        fixedPort = cable->getToPort()->getRenderer();
 
    if (fixedPort)
    {
        highlightInternalPortsConnectableToPort(fixedPort, cable->getRenderer());
        emit highlightPublishedSidebarDropLocationsRequested(fixedPort, eventOnlyConnection);
    }
}
 
void VuoEditorComposition::highlightInternalPortsConnectableToPort(VuoRendererPort *port, VuoRendererCable *cable)
{
    auto types = compiler->getTypes();
 
    QList<QGraphicsItem *> compositionComponents = items();
    for (QList<QGraphicsItem *>::iterator i = compositionComponents.begin(); i != compositionComponents.end(); ++i)
    {
        QGraphicsItem *compositionComponent = *i;
        VuoRendererNode *rn = dynamic_cast<VuoRendererNode *>(compositionComponent);
        if (rn)
        {
            // Check for eligible internal input ports.
            vector<VuoPort *> inputPorts = rn->getBase()->getInputPorts();
            for(vector<VuoPort *>::iterator inputPort = inputPorts.begin(); inputPort != inputPorts.end(); ++inputPort)
                updateEligibilityHighlightingForPort((*inputPort)->getRenderer(), port, !cable->effectivelyCarriesData(), types);
 
            // Check for eligible internal output ports.
            vector<VuoPort *> outputPorts = rn->getBase()->getOutputPorts();
            for(vector<VuoPort *>::iterator outputPort = outputPorts.begin(); outputPort != outputPorts.end(); ++outputPort)
                updateEligibilityHighlightingForPort((*outputPort)->getRenderer(), port, !cable->effectivelyCarriesData(), types);
        }
 
        // Fade out cables that aren't relevant to the current cable drag.
        VuoRendererCable *rc = dynamic_cast<VuoRendererCable *>(compositionComponent);
        if (rc && rc != cable)
        {
            QGraphicsItem::CacheMode normalCacheMode = rc->cacheMode();
            rc->setCacheMode(QGraphicsItem::NoCache);
            rc->updateGeometry();
 
            VuoPort *otherCablePort = port->getInput()
                ? rc->getBase()->getFromPort()
                : rc->getBase()->getToPort();
 
            VuoRendererColors::HighlightType highlight = getEligibilityHighlightingForPort(otherCablePort? otherCablePort->getRenderer() : NULL,
                                                                                           port,
                                                                                           !cable->effectivelyCarriesData(),
                                                                                           types);
 
            // Don't apply extra highlighting to compatible, already-connected cables.
            if (highlight == VuoRendererColors::standardHighlight)
                highlight = VuoRendererColors::noHighlight;
 
            rc->setEligibilityHighlight(highlight);
 
            rc->setCacheMode(normalCacheMode);
        }
    }
 
    // Now that the ports and cables have been highlighted, also highlight the nodes based on those results.
    for (QList<QGraphicsItem *>::iterator i = compositionComponents.begin(); i != compositionComponents.end(); ++i)
        updateEligibilityHighlightingForNode(dynamic_cast<VuoRendererNode *>(*i));
}
 
void VuoEditorComposition::updateEligibilityHighlightingForPort(VuoRendererPort *portToHighlight,
                                                                VuoRendererPort *fixedPort,
                                                                bool eventOnlyConnection,
                                                                map<string, VuoCompilerType *> &types)
{
    QGraphicsItem::CacheMode normalCacheMode = portToHighlight->cacheMode();
    portToHighlight->setCacheMode(QGraphicsItem::NoCache);
 
    portToHighlight->updateGeometry();
 
    VuoRendererColors::HighlightType highlight = getEligibilityHighlightingForPort(portToHighlight, fixedPort, eventOnlyConnection, types);
 
    portToHighlight->setEligibilityHighlight(highlight);
    VuoRendererTypecastPort *typecastPortToHighlight = dynamic_cast<VuoRendererTypecastPort *>(portToHighlight);
    if (typecastPortToHighlight)
        typecastPortToHighlight->getReplacedPort()->setEligibilityHighlight(highlight);
 
    portToHighlight->setCacheMode(normalCacheMode);
 
    if (typecastPortToHighlight)
        updateEligibilityHighlightingForPort(typecastPortToHighlight->getChildPort(), fixedPort, eventOnlyConnection, types);
}
 
VuoRendererColors::HighlightType VuoEditorComposition::getEligibilityHighlightingForPort(VuoRendererPort *portToHighlight, VuoRendererPort *fixedPort, bool eventOnlyConnection, map<string, VuoCompilerType *> &types)
{
    // Determine whether the port endpoints are internal canvas ports or external published sidebar ports.
    VuoRendererPublishedPort *fixedExternalPublishedPort = dynamic_cast<VuoRendererPublishedPort *>(fixedPort);
    VuoRendererPublishedPort *externalPublishedPortToHighlight = dynamic_cast<VuoRendererPublishedPort *>(portToHighlight);
 
    VuoRendererPort *fromPort;
    VuoRendererPort *toPort;
    bool forwardConnection;
    if (fixedPort->getOutput())
    {
        fromPort = fixedPort;
        toPort = portToHighlight;
        forwardConnection = true;
    }
    else
    {
        fromPort = portToHighlight;
        toPort = fixedPort;
        forwardConnection = false;
    }
 
    bool directConnectionPossible;
 
    // Temporarily disallow direct cable connections between published inputs and published outputs.
    // @todo: Allow for https://b33p.net/kosada/node/7756 .
    if (fixedExternalPublishedPort && externalPublishedPortToHighlight) // both ports are external published sidebar ports
        directConnectionPossible = false;
    else if (fixedExternalPublishedPort && !externalPublishedPortToHighlight) // only the fixed port is an external published sidebar port
        directConnectionPossible = fixedExternalPublishedPort->isCompatibleAliasWithSpecializationForInternalPort(portToHighlight, eventOnlyConnection);
    else if (!fixedExternalPublishedPort && externalPublishedPortToHighlight) // only the port to highlight is an external published sidebar port
        directConnectionPossible = externalPublishedPortToHighlight->isCompatibleAliasWithSpecializationForInternalPort(fixedPort, eventOnlyConnection);
    else // both ports are internal canvas ports
        directConnectionPossible = fromPort->canConnectDirectlyWithSpecializationTo(toPort, eventOnlyConnection);
 
    VuoRendererColors::HighlightType highlight;
    if (directConnectionPossible)
        highlight = VuoRendererColors::standardHighlight;
    else if (!findBridgingSolutions(fromPort, toPort, forwardConnection, types).empty())
        highlight = VuoRendererColors::subtleHighlight;
    else if (fixedPort == portToHighlight)
        highlight = VuoRendererColors::noHighlight;
    else
        highlight = VuoRendererColors::ineligibleHighlight;
 
    return highlight;
}
 
bool VuoEditorComposition::canConnectDirectlyWithRespecializationNondestructively(VuoRendererPort *fromPort,
                                                                                  VuoRendererPort *toPort,
                                                                                  bool eventOnlyConnection,
                                                                                  bool forwardConnection)
{
    VuoRendererPort *portToRespecialize = NULL;
    string respecializedTypeName = "";
 
    return canConnectDirectlyWithRespecializationNondestructively(fromPort,
                                                                  toPort,
                                                                  eventOnlyConnection,
                                                                  forwardConnection,
                                                                  &portToRespecialize,
                                                                  respecializedTypeName);
}
 
bool VuoEditorComposition::canConnectDirectlyWithRespecializationNondestructively(VuoRendererPort *fromPort,
                                                                                  VuoRendererPort *toPort,
                                                                                  bool eventOnlyConnection,
                                                                                  bool forwardConnection,
                                                                                  VuoRendererPort **portToRespecialize,
                                                                                  string &respecializedTypeName)
{
    *portToRespecialize = NULL;
    respecializedTypeName = "";
 
    bool canConnectWithRespecialization = canConnectDirectlyWithRespecialization(fromPort,
                                                                                 toPort,
                                                                                 eventOnlyConnection,
                                                                                 forwardConnection,
                                                                                 portToRespecialize,
                                                                                 respecializedTypeName);
    if (!canConnectWithRespecialization)
        return false;
 
    if (canConnectWithRespecialization && !portToRespecialize)
        return true;
 
    bool nondestructive = portCanBeUnspecializedNondestructively((*portToRespecialize)->getBase());
    if (!nondestructive)
    {
        *portToRespecialize = NULL;
        respecializedTypeName = "";
    }
    return nondestructive;
}
 
bool VuoEditorComposition::portCanBeUnspecializedNondestructively(VuoPort *portToUnspecialize)
{
    map<VuoNode *, string> nodesToReplace;
    set<VuoCable *> cablesToDelete;
    createReplacementsToUnspecializePort(portToUnspecialize, false, nodesToReplace, cablesToDelete);
 
    // Check whether unspecialization would disconnect any existing cables
    // (other than the cable that would normally be displaced by the new cable connection).
    if (cablesToDelete.empty())
        return true;
 
    else if ((cablesToDelete.size() == 1) && ((*(cablesToDelete.begin()))->getToPort() == portToUnspecialize))
        return true;
 
    return false;
}
 
bool VuoEditorComposition::canConnectDirectlyWithRespecialization(VuoRendererPort *fromPort,
                                                                  VuoRendererPort *toPort,
                                                                  bool eventOnlyConnection,
                                                                  bool forwardConnection,
                                                                  VuoRendererPort **portToRespecialize,
                                                                  string &respecializedTypeName)
{
    // @todo https://b33p.net/kosada/node/10481 Still need eventOnlyConnection?
 
    *portToRespecialize = NULL;
    respecializedTypeName = "";
 
    // // @todo https://b33p.net/kosada/node/10481 Necessary?
    if (fromPort->canConnectDirectlyWithoutSpecializationTo(toPort, eventOnlyConnection))
        return true;
 
    // // @todo https://b33p.net/kosada/node/10481 Necessary?
    if (fromPort->canConnectDirectlyWithSpecializationTo(toPort, eventOnlyConnection, portToRespecialize, respecializedTypeName))
        return true;
 
    bool fromPortIsEnabledOutput = (fromPort && fromPort->getOutput() && fromPort->isEnabled());
    bool toPortIsEnabledInput = (toPort && toPort->getInput() && toPort->isEnabled());
 
    if (!(fromPortIsEnabledOutput && toPortIsEnabledInput))
        return false;
 
    VuoType *currentFromDataType = fromPort->getDataType();
    VuoType *currentToDataType = toPort->getDataType();
 
    if (!(currentFromDataType && currentToDataType))
        return false;
 
    if (VuoType::isListTypeName(currentFromDataType->getModuleKey()) != VuoType::isListTypeName(currentToDataType->getModuleKey()))
        return false;
 
    VuoGenericType *currentFromGenericType = dynamic_cast<VuoGenericType *>(currentFromDataType);
    VuoGenericType *currentToGenericType = dynamic_cast<VuoGenericType *>(currentToDataType);
 
    VuoGenericType *originalFromGenericType = NULL;
    if (fromPort->getBase()->getRenderer()->getUnderlyingParentNode())
    {
        VuoCompilerNodeClass *fromNodeClass = fromPort->getBase()->getRenderer()->getUnderlyingParentNode()->getBase()->getNodeClass()->getCompiler();
        VuoCompilerSpecializedNodeClass *fromSpecializedNodeClass = dynamic_cast<VuoCompilerSpecializedNodeClass *>(fromNodeClass);
        if (fromSpecializedNodeClass)
        {
            VuoPortClass *portClass = fromPort->getBase()->getClass();
            originalFromGenericType = dynamic_cast<VuoGenericType *>( fromSpecializedNodeClass->getOriginalPortType(portClass) );
        }
    }
 
    VuoGenericType *originalToGenericType = NULL;
    if (toPort->getBase()->getRenderer()->getUnderlyingParentNode())
    {
        VuoCompilerNodeClass *toNodeClass = toPort->getBase()->getRenderer()->getUnderlyingParentNode()->getBase()->getNodeClass()->getCompiler();
        VuoCompilerSpecializedNodeClass *toSpecializedNodeClass = dynamic_cast<VuoCompilerSpecializedNodeClass *>(toNodeClass);
        if (toSpecializedNodeClass)
        {
            VuoPortClass *portClass = toPort->getBase()->getClass();
            originalToGenericType = dynamic_cast<VuoGenericType *>( toSpecializedNodeClass->getOriginalPortType(portClass) );
        }
    }
 
    // Determine whether the port at each endpoint is 1) generic, or
    // 2) specialized and currently revertible, or 3) effectively static.
    bool fromPortIsGeneric = currentFromGenericType;
    bool fromPortIsSpecialized = originalFromGenericType && !currentFromGenericType && isPortCurrentlyRevertible(fromPort);
    bool fromPortIsStatic = (!fromPortIsGeneric && !fromPortIsSpecialized);
 
    bool toPortIsGeneric = currentToGenericType;
    bool toPortIsSpecialized = originalToGenericType && !currentToGenericType && isPortCurrentlyRevertible(toPort);
    bool toPortIsStatic = (!toPortIsGeneric && !toPortIsSpecialized);
 
    // Figure out which port to try to respecialize, and to what type.
    set<string> compatibleTypes;
    string specializedType = "";
    VuoRendererPort *portToTryToRespecialize = NULL;
 
    // Case: One port static, one port specialized.
    if ((fromPortIsStatic && toPortIsSpecialized) || (fromPortIsSpecialized && toPortIsStatic))
    {
        VuoRendererPort *staticPort = (fromPortIsStatic? fromPort : toPort);
        specializedType = staticPort->getDataType()->getModuleKey();
        portToTryToRespecialize = (fromPortIsSpecialized? fromPort : toPort);
    }
 
    // Case: One port specialized, other port generic or specialized.
    else if ((fromPortIsSpecialized || toPortIsSpecialized) && !fromPortIsStatic && !toPortIsStatic)
    {
        VuoRendererPort *dragSource = (forwardConnection? fromPort : toPort);
        bool dragSourceIsGeneric = (forwardConnection? fromPortIsGeneric : toPortIsGeneric);
 
        VuoRendererPort *dragDestination = (forwardConnection? toPort : fromPort);
        bool dragDestinationIsGeneric = (forwardConnection? toPortIsGeneric : fromPortIsGeneric);
 
        // @todo https://b33p.net/kosada/node/10481 : Currently handled in VuoEditorComposition::canConnectDirectlyWithSpecialization(); merge?
        /*
        if (dragSourceIsGeneric && !dragDestinationIsGeneric)
        {
            specializedType = dragDestination->getDataType()->getModuleKey();
            portToTryToRespecialize = dragSource;
        }
        else if (dragDestinationIsGeneric && !dragSourceIsGeneric)
        {
            specializedType = dragSource->getDataType()->getModuleKey();
            portToTryToRespecialize = dragDestination;
        }
        else
        */
 
        if (!dragSourceIsGeneric && !dragDestinationIsGeneric)
        {
            specializedType = dragSource->getDataType()->getModuleKey();
            portToTryToRespecialize = dragDestination;
        }
    }
 
    // @todo https://b33p.net/kosada/node/10481 Other cases.
    else
        return false;
 
    if (portToTryToRespecialize)
        compatibleTypes = getRespecializationOptionsForPortInNetwork(portToTryToRespecialize);
 
    bool portsAreCompatible = (compatibleTypes.find(specializedType) != compatibleTypes.end());
 
    if (portsAreCompatible)
    {
        *portToRespecialize = portToTryToRespecialize;
        respecializedTypeName = specializedType;
    }
 
    return portsAreCompatible;
}
 
void VuoEditorComposition::updateEligibilityHighlightingForNode(VuoRendererNode *node)
{
    VuoRendererInputDrawer *drawer = dynamic_cast<VuoRendererInputDrawer *>(node);
    if (drawer)
    {
        VuoRendererColors::HighlightType bestEligibility = VuoRendererColors::ineligibleHighlight;
        foreach (VuoRendererPort *drawerPort, drawer->getDrawerPorts())
            if (drawerPort->eligibilityHighlight() == VuoRendererColors::standardHighlight)
                bestEligibility = VuoRendererColors::standardHighlight;
            else if (drawerPort->eligibilityHighlight() == VuoRendererColors::subtleHighlight
                     && bestEligibility != VuoRendererColors::standardHighlight)
                bestEligibility = VuoRendererColors::subtleHighlight;
 
        // If this drawer has no eligible ports, fade it out.
        {
            QGraphicsItem::CacheMode normalCacheMode = drawer->cacheMode();
            drawer->setCacheMode(QGraphicsItem::NoCache);
            drawer->updateGeometry();
 
            drawer->setEligibilityHighlight(bestEligibility);
 
            drawer->setCacheMode(normalCacheMode);
        }
 
        // Make sure the host port is repainted to take into account the eligibility of its drawer ports.
        if (drawer->getRenderedHostPort()
         && drawer->getRenderedHostPort()->getRenderer())
        {
            VuoRendererPort *hostPort = drawer->getRenderedHostPort()->getRenderer();
 
            QGraphicsItem::CacheMode normalCacheMode = hostPort->cacheMode();
            hostPort->setCacheMode(QGraphicsItem::NoCache);
            hostPort->updateGeometry();
            hostPort->setCacheMode(normalCacheMode);
        }
    }
}
 
void VuoEditorComposition::clearCableEndpointEligibilityHighlighting()
{
    clearInternalPortEligibilityHighlighting();
    emit clearPublishedSidebarDropLocationHighlightingRequested();
}
 
bool VuoEditorComposition::selectBridgingSolution(VuoRendererPort *fromPort,
                                                  VuoRendererPort *toPort,
                                                  bool toPortIsDragDestination,
                                                  VuoRendererPort **portToSpecialize,
                                                  string &specializedTypeName,
                                                  string &typecastToInsert)
{
    *portToSpecialize = NULL;
    specializedTypeName = "";
 
    map<string, VuoRendererPort *> portToSpecializeForTypecast;
    map<string, string> specializedTypeNameForTypecast;
 
    auto types = compiler->getTypes();
    vector<string> candidateTypecasts = findBridgingSolutions(fromPort, toPort, toPortIsDragDestination, portToSpecializeForTypecast, specializedTypeNameForTypecast, types);
    bool solutionSelected = selectBridgingSolutionFromOptions(candidateTypecasts, portToSpecializeForTypecast, specializedTypeNameForTypecast, typecastToInsert);
 
    if (!solutionSelected)
        return false;
 
    if (portToSpecializeForTypecast.find(typecastToInsert) != portToSpecializeForTypecast.end())
        *portToSpecialize = portToSpecializeForTypecast[typecastToInsert];
    if (specializedTypeNameForTypecast.find(typecastToInsert) != specializedTypeNameForTypecast.end())
        specializedTypeName = specializedTypeNameForTypecast[typecastToInsert];
 
    return true;
}
 
bool VuoEditorComposition::selectBridgingSolutionFromOptions(vector<string> suitableTypecasts,
                                                             map<string, VuoRendererPort *> portToSpecializeForTypecast,
                                                             map<string, string> specializedTypeNameForTypecast,
                                                             string &selectedTypecast)
{
    if (suitableTypecasts.empty())
    {
        selectedTypecast = "";
        return false;
    }
 
    else if (suitableTypecasts.size() == 1)
    {
        selectedTypecast = suitableTypecasts[0];
        return true;
    }
 
    else
        return promptForBridgingSelectionFromOptions(suitableTypecasts, portToSpecializeForTypecast, specializedTypeNameForTypecast, selectedTypecast);
}
 
bool VuoEditorComposition::portsPassSanityCheckToBridge(VuoRendererPort *fromPort, VuoRendererPort *toPort)
{
    bool fromPortIsEnabledOutput = (fromPort && fromPort->getOutput() && fromPort->isEnabled());
    bool toPortIsEnabledInput = (toPort && toPort->getInput() && toPort->isEnabled());
 
    return (fromPortIsEnabledOutput && toPortIsEnabledInput &&
            fromPort->getBase()->getClass()->hasCompiler() &&
            toPort->getBase()->getClass()->hasCompiler());
}
 
bool VuoEditorComposition::portsPassSanityCheckToTypeconvert(VuoRendererPort *fromPort, VuoRendererPort *toPort, VuoType *candidateFromType, VuoType *candidateToType)
{
    if (!portsPassSanityCheckToBridge(fromPort, toPort))
        return false;
 
    VuoType *inType = (candidateFromType? candidateFromType : static_cast<VuoCompilerPortClass *>(fromPort->getBase()->getClass()->getCompiler())->getDataVuoType());
    VuoType *outType = (candidateToType? candidateToType : static_cast<VuoCompilerPortClass *>(toPort->getBase()->getClass()->getCompiler())->getDataVuoType());
 
    // To reduce confusion, don't offer Boolean -> Integer as a type conversion option for nodes that use 1-based indices.
    if (inType && (inType->getModuleKey() == "VuoBoolean") && outType && (outType->getModuleKey() == "VuoInteger"))
    {
        bool toNodeUsesIndex = toPort->getUnderlyingParentNode() &&
                               (VuoStringUtilities::beginsWith(toPort->getUnderlyingParentNode()->getBase()->getNodeClass()->getClassName(), "vuo.text.") ||
                                VuoStringUtilities::beginsWith(toPort->getUnderlyingParentNode()->getBase()->getNodeClass()->getClassName(), "vuo.select.") ||
                                (VuoStringUtilities::beginsWith(toPort->getUnderlyingParentNode()->getBase()->getNodeClass()->getClassName(), "vuo.list.") &&
                                 !VuoStringUtilities::beginsWith(toPort->getUnderlyingParentNode()->getBase()->getNodeClass()->getClassName(), "vuo.list.make."))
                                );
 
        if (toNodeUsesIndex)
            return false;
    }
 
    return true;
}
 
vector<string> VuoEditorComposition::findBridgingSolutions(VuoRendererPort *fromPort,
                                                           VuoRendererPort *toPort,
                                                           bool toPortIsDragDestination,
                                                           map<string, VuoCompilerType *> &types)
{
    map<string, VuoRendererPort *> portToSpecializeForTypecast;
    map<string, string> specializedTypeNameForTypecast;
    return findBridgingSolutions(fromPort, toPort, toPortIsDragDestination, portToSpecializeForTypecast, specializedTypeNameForTypecast, types);
}
 
vector<string> VuoEditorComposition::findBridgingSolutions(VuoRendererPort *fromPort,
                                                           VuoRendererPort *toPort,
                                                           bool toPortIsDragDestination,
                                                           map<string, VuoRendererPort *> &portToSpecializeForTypecast,
                                                           map<string, string> &specializedTypeNameForTypecast,
                                                           map<string, VuoCompilerType *> &types)
{
    // If `limitCombinations` is `true`, first considers solutions that involve typeconversion
    // or specialization, but not both; if no such solution exists, returns solutions that involve
    // typeconversion+specialization combinations.
    // If `limitCombinations` is `false`, returns all solutions, whether they involve typeconversion,
    // specialization, or both.
    const bool limitCombinations = true;
 
    portToSpecializeForTypecast.clear();
    specializedTypeNameForTypecast.clear();
    vector<string> suitableTypecasts;
 
    if (!portsPassSanityCheckToBridge(fromPort, toPort))
        return suitableTypecasts;
 
    // Temporarily disallow direct cable connections between published inputs and published outputs.
    // @todo: Allow for https://b33p.net/kosada/node/7756 .
    if (dynamic_cast<VuoRendererPublishedPort *>(fromPort) && dynamic_cast<VuoRendererPublishedPort *>(toPort))
        return suitableTypecasts;
 
    // Case: We have an unspecialized (generic) port. See whether we can specialize it to complete the connection without typeconversion.
    {
        VuoRendererPort *portToSpecialize = NULL;
        string specializedTypeName = "";
        if (fromPort->canConnectDirectlyWithSpecializationTo(toPort, !cableInProgress->getRenderer()->effectivelyCarriesData(), &portToSpecialize, specializedTypeName))
        {
            suitableTypecasts.push_back("");
            portToSpecializeForTypecast[""] = portToSpecialize;
            specializedTypeNameForTypecast[""] = specializedTypeName;
 
            return suitableTypecasts;
        }
    }
 
    VuoType *currentFromDataType = fromPort->getDataType();
    VuoType *currentToDataType = toPort->getDataType();
 
    if (!(currentFromDataType && currentToDataType))
        return suitableTypecasts;
 
    VuoGenericType *currentFromGenericType = dynamic_cast<VuoGenericType *>(currentFromDataType);
    VuoGenericType *currentToGenericType = dynamic_cast<VuoGenericType *>(currentToDataType);
 
    VuoGenericType *originalFromGenericType = NULL;
    if (fromPort->getBase()->getRenderer()->getUnderlyingParentNode())
    {
        VuoCompilerNodeClass *fromNodeClass = fromPort->getBase()->getRenderer()->getUnderlyingParentNode()->getBase()->getNodeClass()->getCompiler();
        VuoCompilerSpecializedNodeClass *fromSpecializedNodeClass = dynamic_cast<VuoCompilerSpecializedNodeClass *>(fromNodeClass);
        if (fromSpecializedNodeClass)
        {
            VuoPortClass *portClass = fromPort->getBase()->getClass();
            originalFromGenericType = dynamic_cast<VuoGenericType *>( fromSpecializedNodeClass->getOriginalPortType(portClass) );
        }
    }
 
    VuoGenericType *originalToGenericType = NULL;
    if (toPort->getBase()->getRenderer()->getUnderlyingParentNode())
    {
        VuoCompilerNodeClass *toNodeClass = toPort->getBase()->getRenderer()->getUnderlyingParentNode()->getBase()->getNodeClass()->getCompiler();
        VuoCompilerSpecializedNodeClass *toSpecializedNodeClass = dynamic_cast<VuoCompilerSpecializedNodeClass *>(toNodeClass);
        if (toSpecializedNodeClass)
        {
            VuoPortClass *portClass = toPort->getBase()->getClass();
            originalToGenericType = dynamic_cast<VuoGenericType *>( toSpecializedNodeClass->getOriginalPortType(portClass) );
        }
    }
 
    // Determine whether the port at each endpoint is:
    // 1) generic (unspecialized), or
    // 2) specialized and currently revertible, or
    // 3) effectively static.
    bool fromPortIsGeneric = currentFromGenericType;
    bool fromPortIsSpecialized = originalFromGenericType && !currentFromGenericType && isPortCurrentlyRevertible(fromPort);
    bool fromPortIsStatic = (!fromPortIsGeneric && !fromPortIsSpecialized);
 
    bool toPortIsGeneric = currentToGenericType;
    bool toPortIsSpecialized = originalToGenericType && !currentToGenericType && isPortCurrentlyRevertible(toPort);
    bool toPortIsStatic = (!toPortIsGeneric && !toPortIsSpecialized);
 
    // No typeconversion or specialization options between two unspecialized generic ports.
    if (fromPortIsGeneric && toPortIsGeneric)
        return suitableTypecasts;
 
    // Typeconversion options but no specialization options between two static ports.
    else if (fromPortIsStatic && toPortIsStatic)
    {
        if (portsPassSanityCheckToTypeconvert(fromPort, toPort))
            suitableTypecasts = moduleManager->getCompatibleTypecastClasses(currentFromDataType, currentToDataType);
        return suitableTypecasts;
    }
 
    // Remaining combinations might require (re-)specializing one port or the other.
    // Figure out which port to consider (re-)specializing.
    bool specializeToPort = true;
    if (toPortIsGeneric)
        specializeToPort = true;
    else if (fromPortIsGeneric)
        specializeToPort = false;
    else if (fromPortIsSpecialized && toPortIsStatic)
        specializeToPort = false;
    else if (fromPortIsStatic && toPortIsSpecialized)
        specializeToPort = true;
    else if (fromPortIsSpecialized && toPortIsSpecialized)
        specializeToPort = toPortIsDragDestination;
 
    // Now that ports have been categorized, figure out what combinations of (re-)specialization
    // and/or typeconversion we can use to bridge them.
    set<string> compatibleTypes;
    if (specializeToPort && (toPortIsGeneric || (toPortIsSpecialized && portCanBeUnspecializedNondestructively(toPort->getBase()))))
        compatibleTypes = getRespecializationOptionsForPortInNetwork(toPort);
    else if (!specializeToPort && (fromPortIsGeneric || (fromPortIsSpecialized && portCanBeUnspecializedNondestructively(fromPort->getBase()))))
        compatibleTypes = getRespecializationOptionsForPortInNetwork(fromPort);
 
    // Typeconversion without re-specialization may be possible. In this case, don't require that the port be
    // non-destructively unspecializable, since it already has the appropriate specialization.
    compatibleTypes.insert(specializeToPort? currentToDataType->getModuleKey() : currentFromDataType->getModuleKey());
 
    if (limitCombinations)
    {
        vector<string> limitedSuitableTypecasts;
 
        // Check for bridging solutions that involve typeconversion without specialization.
        if (portsPassSanityCheckToTypeconvert(fromPort, toPort))
        {
            limitedSuitableTypecasts = moduleManager->getCompatibleTypecastClasses(currentFromDataType, currentToDataType);
            foreach (string typecastName, limitedSuitableTypecasts)
            {
                portToSpecializeForTypecast[typecastName] = specializeToPort? toPort : fromPort;
                specializedTypeNameForTypecast[typecastName] = specializeToPort? currentToDataType->getModuleKey() :
                                                                                 currentFromDataType->getModuleKey();
            }
        }
 
        // Check for bridging solutions that involve specialization without typeconversion.
        string fixedDataType = specializeToPort? currentFromDataType->getModuleKey() : currentToDataType->getModuleKey();
        if (compatibleTypes.find(fixedDataType) != compatibleTypes.end())
        {
            limitedSuitableTypecasts.push_back("");
            portToSpecializeForTypecast[""] = specializeToPort? toPort : fromPort;
            specializedTypeNameForTypecast[""] = fixedDataType;
        }
 
        if (limitedSuitableTypecasts.size() >= 1)
            return limitedSuitableTypecasts;
    }
 
    foreach (string compatibleTypeName, compatibleTypes)
    {
        VuoCompilerType *compatibleSpecializedType = types[compatibleTypeName];
        if (!compatibleSpecializedType)
            compatibleSpecializedType = compiler->getType(compatibleTypeName);
        VuoType *candidateFromType = specializeToPort? currentFromDataType : compatibleSpecializedType->getBase();
        VuoType *candidateToType = specializeToPort? compatibleSpecializedType->getBase() : currentToDataType;
 
        if (compatibleSpecializedType)
        {
            // Re-specialization without typeconversion may be possible.
            if (candidateFromType == candidateToType)
            {
                suitableTypecasts.push_back("");
                portToSpecializeForTypecast[""] = specializeToPort? toPort : fromPort;
                specializedTypeNameForTypecast[""] = compatibleSpecializedType->getBase()->getModuleKey();
            }
 
            if (portsPassSanityCheckToTypeconvert(fromPort,
                                                  toPort,
                                                  candidateFromType,
                                                  candidateToType))
            {
                vector<string> suitableTypecastsForCurrentTypes = moduleManager->getCompatibleTypecastClasses(candidateFromType, candidateToType);
                foreach (string typecast, suitableTypecastsForCurrentTypes)
                {
                    suitableTypecasts.push_back(typecast);
                    portToSpecializeForTypecast[typecast] = specializeToPort? toPort : fromPort;
                    specializedTypeNameForTypecast[typecast] = compatibleSpecializedType->getBase()->getModuleKey();
                }
            }
        }
    }
 
    return suitableTypecasts;
}
 
bool VuoEditorComposition::promptForBridgingSelectionFromOptions(vector<string> suitableTypecasts,
                                                             map<string, VuoRendererPort *> portToSpecializeForTypecast,
                                                             map<string, string> specializedTypeNameForTypecast,
                                                             string &selectedTypecast)
{
    QMenu typecastMenu(views()[0]->viewport());
    typecastMenu.setSeparatorsCollapsible(false); 
    QString spacer("    ");
 
    // Inventory specialization options
    set <pair<VuoRendererPort *, string> > specializationDetails;
    vector<string> typeconversionOptionsRequiringNoSpecialization;
    foreach (string typecastClassName, suitableTypecasts)
    {
        VuoRendererPort *portToSpecialize = portToSpecializeForTypecast[typecastClassName];
        string specializedTypeName = specializedTypeNameForTypecast[typecastClassName];
        specializationDetails.insert(std::make_pair(portToSpecialize,
                                                    specializedTypeName));
 
        bool portAlreadyHasTargetType = (!portToSpecialize || (portToSpecialize->getDataType() && (portToSpecialize->getDataType()->getModuleKey() == specializedTypeName)));
        if (portAlreadyHasTargetType)
            typeconversionOptionsRequiringNoSpecialization.push_back(typecastClassName);
    }
 
    // If there is a bridging option that requires no typeconversion, it doesn't need the usual
    // specialization heading under which multiple typeconversion options may be listed.
    // Selecting this item itself will invoke the specialization.
    if ((std::find(suitableTypecasts.begin(), suitableTypecasts.end(), "") != suitableTypecasts.end()))
    {
        QString menuText = getDisplayTextForSpecializationOption(portToSpecializeForTypecast[""], specializedTypeNameForTypecast[""]);
        QAction *typecastAction = typecastMenu.addAction(menuText);
        typecastAction->setData(QVariant(""));
    }
 
    bool foundSpecializationOptionsRequiringNoTypeconversion = typecastMenu.actions().size() >= 1;
    bool foundTypeconversionOptionsRequiringNoSpecialization = typeconversionOptionsRequiringNoSpecialization.size() >= 1;
 
    // If there are bridging options that require no specialization, list them next.
    bool includingTypeconvertWithNoSpecializationHeader = foundSpecializationOptionsRequiringNoTypeconversion;
    if (foundTypeconversionOptionsRequiringNoSpecialization)
    {
        if (foundSpecializationOptionsRequiringNoTypeconversion)
            typecastMenu.addSeparator();
 
        VuoRendererPort *portToSpecialize = portToSpecializeForTypecast[typeconversionOptionsRequiringNoSpecialization[0] ];
        string specializedTypeName = specializedTypeNameForTypecast[typeconversionOptionsRequiringNoSpecialization[0] ];
 
        if (portToSpecialize && !specializedTypeName.empty())
        {
            QString menuText = getDisplayTextForSpecializationOption(portToSpecialize, specializedTypeName);
            QAction *typecastAction = typecastMenu.addAction(menuText);
            typecastAction->setEnabled(false);
            includingTypeconvertWithNoSpecializationHeader = true;
        }
    }
 
    foreach (string typecastClassName, typeconversionOptionsRequiringNoSpecialization)
    {
        VuoCompilerNodeClass *typecastClass = compiler->getNodeClass(typecastClassName);
        if (typecastClass)
        {
            QAction *typecastAction = typecastMenu.addAction((includingTypeconvertWithNoSpecializationHeader? spacer : "") + VuoRendererTypecastPort::getTypecastTitleForNodeClass(typecastClass->getBase(), true));
            typecastAction->setData(QVariant(typecastClassName.c_str()));
        }
    }
 
    // Now list the remaining bridging options.
    for (set<pair<VuoRendererPort *, string> >::iterator i = specializationDetails.begin(); i != specializationDetails.end(); ++i)
    {
        VuoRendererPort *portToSpecialize = i->first;
        string specializedTypeName = i->second;
 
        // We've already listed the no-typeconversion bridging option, so skip it here.
        if ((std::find(suitableTypecasts.begin(), suitableTypecasts.end(), "") != suitableTypecasts.end()) &&
                (portToSpecializeForTypecast[""] == portToSpecialize) &&
                (specializedTypeNameForTypecast[""] == specializedTypeName))
        {
            continue;
        }
 
        // We've already listed the no-specialization bridging option, so skip it here.
        bool portAlreadyHasTargetType = (!portToSpecialize || (portToSpecialize->getDataType() && (portToSpecialize->getDataType()->getModuleKey() == specializedTypeName)));
        if (portAlreadyHasTargetType)
        {
            continue;
        }
 
        if (typecastMenu.actions().size() >= 1)
            typecastMenu.addSeparator();
 
        QString menuText = getDisplayTextForSpecializationOption(portToSpecialize, specializedTypeName);
        QAction *typecastAction = typecastMenu.addAction(menuText);
        typecastAction->setEnabled(false);
 
        // Inventory typeconversion options associated with this specialization option.
        foreach (string typecastClassName, suitableTypecasts)
        {
            if ((portToSpecializeForTypecast[typecastClassName] == portToSpecialize) &&
                    (specializedTypeNameForTypecast[typecastClassName] == specializedTypeName))
            {
                VuoCompilerNodeClass *typecastClass = compiler->getNodeClass(typecastClassName);
                if (typecastClass)
                {
                    QAction *typecastAction = typecastMenu.addAction(spacer + VuoRendererTypecastPort::getTypecastTitleForNodeClass(typecastClass->getBase(), true));
                    typecastAction->setData(QVariant(typecastClassName.c_str()));
                }
            }
        }
    }
 
    menuSelectionInProgress = true;
    QAction *selectedTypecastAction = typecastMenu.exec(QCursor::pos());
    menuSelectionInProgress = false;
 
    selectedTypecast = (selectedTypecastAction? selectedTypecastAction->data().toString().toUtf8().constData() : "");
    return selectedTypecastAction;
}
 
QString VuoEditorComposition::getDisplayTextForSpecializationOption(VuoRendererPort *portToSpecialize, string specializedTypeName)
{
    if (!portToSpecialize || specializedTypeName.empty())
        return "";
 
    bool isInput = portToSpecialize && portToSpecialize->getInput();
    QString typeDisplayName = compiler->getType(specializedTypeName)?
                                  formatTypeNameForDisplay(compiler->getType(specializedTypeName)->getBase()) :
                                  specializedTypeName.c_str();
 
    bool portAlreadyHasTargetType = (!portToSpecialize || (portToSpecialize->getDataType() && (portToSpecialize->getDataType()->getModuleKey() == specializedTypeName)));
 
    QString displayText;
    if (portAlreadyHasTargetType)
    {
        if (isInput)
        {
            //: Appears as a section label in the popup menu when connecting a cable to an input port that has multiple specialization/type-conversion options.
            displayText = tr("Keep Input Port as %1");
        }
        else
        {
            //: Appears as a section label in the popup menu when connecting a cable to an output port that has multiple specialization/type-conversion options.
            displayText = tr("Keep Output Port as %1");
        }
    }
    else
    {
        if (isInput)
        {
            //: Appears as an item in the popup menu when connecting a cable to an input port that has multiple specialization/type-conversion options.
            displayText = tr("Change Input Port to %1");
        }
        else
        {
            //: Appears as an item in the popup menu when connecting a cable to an output port that has multiple specialization/type-conversion options.
            displayText = tr("Change Output Port to %1");
        }
    }
 
    return displayText.arg(typeDisplayName);
}
 
json_object * VuoEditorComposition::getPortValueInRunningComposition(VuoPort *port)
{
    __block json_object *portValue = NULL;
 
    if (! port->getRenderer()->getDataType())
        return portValue;
 
    string runningPortIdentifier = identifierCache->getIdentifierForPort(port);
    bool isInput = port->getRenderer()->getInput();
 
    void (^getPortValue)(VuoEditorComposition *, string) = ^void (VuoEditorComposition *topLevelComposition, string thisCompositionIdentifier)
    {
        dispatch_sync(topLevelComposition->runCompositionQueue, ^{
            if (topLevelComposition->isRunningThreadUnsafe())
            {
                portValue = isInput ?
                                topLevelComposition->runner->getInputPortValue(thisCompositionIdentifier, runningPortIdentifier) :
                                topLevelComposition->runner->getOutputPortValue(thisCompositionIdentifier, runningPortIdentifier);
            }
        });
    };
    static_cast<VuoEditor *>(qApp)->getSubcompositionRouter()->applyToLinkedTopLevelComposition(this, getPortValue);
 
    return portValue;
}
 
string VuoEditorComposition::getIdentifierForRunningPort(VuoPort *runningPort)
{
    return static_cast<VuoCompilerPort *>(runningPort->getCompiler())->getIdentifier();
}
 
string VuoEditorComposition::getIdentifierForStaticPort(VuoPort *staticPort, VuoNode *parentNode)
{
    if (!staticPort)
        return "";
 
    // Published ports
    if (dynamic_cast<VuoPublishedPort *>(staticPort))
        return dynamic_cast<VuoPublishedPort *>(staticPort)->getClass()->getName();
 
    // Internal ports
    // We might as well use the same naming scheme here as is used in the running composition,
    // but the VuoCompilerPort::getIdentifier() call will fail unless its parent
    // node identifier has been explicitly set.
    string nodeIdentifier = "";
    if (parentNode && parentNode->hasCompiler())
        nodeIdentifier = parentNode->getCompiler()->getIdentifier();
    else if (staticPort->hasRenderer() &&
            staticPort->getRenderer()->getUnderlyingParentNode() &&
            staticPort->getRenderer()->getUnderlyingParentNode()->getBase()->hasCompiler())
    {
        nodeIdentifier = staticPort->getRenderer()->getUnderlyingParentNode()->getBase()->getCompiler()->getIdentifier();
    }
 
    if (staticPort->hasCompiler() && !nodeIdentifier.empty())
    {
        dynamic_cast<VuoCompilerPort *>(staticPort->getCompiler())->setNodeIdentifier(nodeIdentifier);
        return static_cast<VuoCompilerPort *>(staticPort->getCompiler())->getIdentifier();
    }
    else
        return "";
}
 
VuoPort * VuoEditorComposition::getPortWithStaticIdentifier(string portID)
{
    VuoPort *port = nullptr;
    identifierCache->doForPortWithIdentifier(portID, [&port](VuoPort *p) {
        port = p;
    });
    return port;
}
 
VuoNode * VuoEditorComposition::getUnderlyingParentNodeForPort(VuoPort *port, VuoEditorComposition *composition)
{
    if (port->hasRenderer())
    {
        if (dynamic_cast<VuoRendererPublishedPort *>(port->getRenderer()))
        {
            bool isPublishedInput = !port->getRenderer()->getInput();
            return (isPublishedInput? composition->getPublishedInputNode() :
                                      composition->getPublishedOutputNode());
        }
 
        else
            return port->getRenderer()->getUnderlyingParentNode()->getBase();
    }
 
    foreach (VuoNode *n, composition->getBase()->getNodes())
    {
        VuoPort *candidateInputPort = n->getInputPortWithName(port->getClass()->getName());
        if (candidateInputPort == port)
            return n;
 
        VuoPort *candidateOutputPort = n->getOutputPortWithName(port->getClass()->getName());
        if (candidateOutputPort == port)
            return n;
    }
 
    return NULL;
}
 
VuoPortPopover * VuoEditorComposition::getActivePopoverForPort(string portID)
{
    map<string, VuoPortPopover *>::iterator popover = activePortPopovers.find(portID);
    if (popover != activePortPopovers.end())
        return popover->second;
 
    else
        return NULL;
}
 
void VuoEditorComposition::enableInactivePopoverForPort(VuoRendererPort *rp)
{
    string portID = identifierCache->getIdentifierForPort(rp->getBase());
    bool popoverJustClosedAtLastEvent = portsWithPopoversClosedAtLastEvent.find(portID) != portsWithPopoversClosedAtLastEvent.end();
    if (!popoverJustClosedAtLastEvent)
        enablePopoverForPort(rp);
}
 
void VuoEditorComposition::enablePopoverForPort(VuoRendererPort *rp)
{
    if (!popoverEventsEnabled)
        return;
 
    VuoPort *port = rp->getBase();
    string portID = identifierCache->getIdentifierForPort(port);
 
    VUserLog("%s:      Open   popover for %s",
        window->getWindowTitleWithoutPlaceholder().toUtf8().data(),
        portID.c_str());
 
    dispatch_sync(runCompositionQueue, ^{  // Don't add any new popovers while the composition is starting. https://b33p.net/kosada/node/15572
 
        dispatch_sync(activePortPopoversQueue, ^{
 
            if (activePortPopovers.find(portID) == activePortPopovers.end())
            {
                // Assigning the popover a parent widget allows us to give it rounded corners
                // and a background fill that respects its rounded boundaries.
                VuoPortPopover *popover = new VuoPortPopover(port, this, views()[0]->viewport());
 
                connect(popover, &VuoPortPopover::popoverClosedForPort, this, &VuoEditorComposition::disablePopoverForPortThreadSafe);
                connect(popover, &VuoPortPopover::popoverDetachedFromPort, [=]{
                    VUserLog("%s:      Detach popover for %s",
                        window->getWindowTitleWithoutPlaceholder().toUtf8().data(),
                        portID.c_str());
                    popoverDetached();
                });
                connect(popover, &VuoPortPopover::popoverResized, this, &VuoEditorComposition::repositionPopover);
                connect(this, &VuoEditorComposition::compositionOnTop, popover, &VuoPortPopover::setWindowLevelAndVisibility);
                connect(this, &VuoEditorComposition::applicationActive, popover, &VuoPortPopover::setWindowLevel);
 
                // Line up the top left of the dialog with the port.
                QPoint portLeftInScene = port->getRenderer()->scenePos().toPoint() - QPoint(port->getRenderer()->getPortRect().width()/2., 0);
 
                // Don't let popovers get cut off at the right or bottom edges of the canvas.
                const int cutoffMargin = 16;
                QRectF viewportRect = views()[0]->mapToScene(views()[0]->viewport()->rect()).boundingRect();
                if (portLeftInScene.x() + popover->size().width() + cutoffMargin > viewportRect.right())
                    portLeftInScene = QPoint(viewportRect.right() - popover->size().width() - cutoffMargin, portLeftInScene.y());
                if (portLeftInScene.y() + popover->size().height() + cutoffMargin > viewportRect.bottom())
                    portLeftInScene = QPoint(portLeftInScene.x(), viewportRect.bottom() - popover->size().height() - cutoffMargin);
 
                QPoint popoverLeftInView = views()[0]->mapFromScene(portLeftInScene);
 
                const QPoint offset = QPoint(12, 6);
 
                QPoint popoverTopLeft = popoverLeftInView + offset;
                popover->move(popoverTopLeft);
                popover->show();
 
                activePortPopovers[portID] = popover;
 
                dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{  // Get off of runCompositionQueue. https://b33p.net/kosada/node/14612
                    updateDataInPortPopover(portID);
                });
            }
        });
    });
}
 
void VuoEditorComposition::enablePopoverForNode(VuoRendererNode *rn)
{
    if (popoverEventsEnabled && !dynamic_cast<VuoRendererInputDrawer *>(rn))
        emit nodePopoverRequestedForClass(rn->getBase()->getNodeClass());
}
 
void VuoEditorComposition::disablePopoverForPort(string portID)
{
    VUserLog("%s:      Close  popover for %s",
        window->getWindowTitleWithoutPlaceholder().toUtf8().data(),
        portID.c_str());
 
    VuoPortPopover *popover = NULL;
    map<string, VuoPortPopover *>::iterator i = activePortPopovers.find(portID);
    if (i != activePortPopovers.end())
    {
        popover = i->second;
        activePortPopovers.erase(i);
    }
 
    if (popover)
    {
        popover->hide();
        popover->deleteLater();
    }
 
    bool isInput = false;
    bool foundPort = identifierCache->doForPortWithIdentifier(portID, [&isInput](VuoPort *port) {
        isInput = port->getRenderer()->getInput();
    });
 
    if (! foundPort)
        return;
 
    dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{  // Get off of activePortPopoversQueue.
        static_cast<VuoEditor *>(qApp)->getSubcompositionRouter()->applyToLinkedTopLevelComposition(this, ^void (VuoEditorComposition *topLevelComposition, string thisCompositionIdentifier)
        {
            dispatch_async(topLevelComposition->runCompositionQueue, ^{
                if (topLevelComposition->isRunningThreadUnsafe())
                {
                    (isInput ?
                      topLevelComposition->runner->unsubscribeFromInputPortTelemetry(thisCompositionIdentifier, portID) :
                      topLevelComposition->runner->unsubscribeFromOutputPortTelemetry(thisCompositionIdentifier, portID));
                }
            });
        });
    });
}
 
void VuoEditorComposition::disablePopoverForPortThreadSafe(string portID)
{
    dispatch_sync(activePortPopoversQueue, ^{
        disablePopoverForPort(portID);
    });
}
 
void VuoEditorComposition::disablePopovers()
{
    disablePortPopovers();
    disableErrorPopovers();
}
 
void VuoEditorComposition::disableErrorPopovers()
{
    foreach (VuoErrorPopover *errorPopover, errorPopovers)
    {
        errorPopover->hide();
        errorPopover->deleteLater();
    }
 
    errorPopovers.clear();
}
 
void VuoEditorComposition::disablePortPopovers(VuoRendererNode *node)
{
    dispatch_sync(activePortPopoversQueue, ^{
        map<string, VuoPortPopover *> popoversToDisable = activePortPopovers;
        for (map<string, VuoPortPopover *>::iterator i = popoversToDisable.begin(); i != popoversToDisable.end(); ++i)
        {
            string portID = i->first;
            bool shouldDisable = false;
 
            if (! node)
                shouldDisable = true;
            else
            {
                identifierCache->doForPortWithIdentifier(portID, [&shouldDisable, node](VuoPort *port) {
                    shouldDisable = port->hasRenderer() && (port->getRenderer()->getUnderlyingParentNode() == node);
                });
            }
 
            if (shouldDisable)
                disablePopoverForPort(portID);
        }
    });
}
 
void VuoEditorComposition::disableStrandedPortPopovers()
{
    dispatch_sync(activePortPopoversQueue, ^{
        map<string, VuoPortPopover *> popoversToDisable = activePortPopovers;
        for (map<string, VuoPortPopover *>::iterator i = popoversToDisable.begin(); i != popoversToDisable.end(); ++i)
        {
            string portID = i->first;
 
            bool foundPort = identifierCache->doForPortWithIdentifier(portID, [&foundPort](VuoPort *port) {});
            if (! foundPort)
                disablePopoverForPort(portID);
        }
    });
}
 
void VuoEditorComposition::disableNondetachedPortPopovers(VuoRendererNode *node, bool recordWhichPopoversClosed)
{
    if (recordWhichPopoversClosed)
        portsWithPopoversClosedAtLastEvent.clear();
 
    dispatch_sync(activePortPopoversQueue, ^{
        map<string, VuoPortPopover *> popoversToDisable = activePortPopovers;
        for (map<string, VuoPortPopover *>::iterator i = popoversToDisable.begin(); i != popoversToDisable.end(); ++i)
        {
            string portID = i->first;
            bool shouldDisable = false;
 
            if (! node)
                shouldDisable = true;
            else
            {
                identifierCache->doForPortWithIdentifier(portID, [&shouldDisable, node](VuoPort *port) {
                    shouldDisable = port->hasRenderer() && (port->getRenderer()->getUnderlyingParentNode() == node);
                });
            }
 
            if (shouldDisable)
            {
                VuoPortPopover *popover = getActivePopoverForPort(portID);
                if (! (popover && popover->getDetached()))
                {
                    disablePopoverForPort(portID);
                    portsWithPopoversClosedAtLastEvent.insert(portID);
                }
            }
        }
    });
}
 
void VuoEditorComposition::movePopoversBy(int dx, int dy)
{
    moveDetachedPortPopoversBy(dx, dy);
    moveErrorPopoversBy(dx, dy);
}
 
void VuoEditorComposition::moveErrorPopoversBy(int dx, int dy)
{
    foreach(VuoErrorPopover *errorPopover, errorPopovers)
        errorPopover->move(errorPopover->pos().x()+dx, errorPopover->pos().y()+dy);
}
 
void VuoEditorComposition::moveDetachedPortPopoversBy(int dx, int dy)
{
    dispatch_sync(activePortPopoversQueue, ^{
        map<string, VuoPortPopover *> portPopovers = activePortPopovers;
        for (map<string, VuoPortPopover *>::iterator i = portPopovers.begin(); i != portPopovers.end(); ++i)
        {
            VuoPortPopover *popover = i->second;
            if (popover && popover->getDetached())
                popover->move(popover->pos().x()+dx, popover->pos().y()+dy);
        }
    });
}
 
void VuoEditorComposition::setPopoversHideOnDeactivate(bool shouldHide)
{
    dispatch_sync(activePortPopoversQueue, ^{
        auto portPopovers = activePortPopovers;
        for (auto i : portPopovers)
        {
            VuoPortPopover *popover = i.second;
            if (popover && popover->getDetached())
            {
                id nsWindow = (id)VuoPopover::getWindowForPopover(popover);
                objc_msgSend(nsWindow, sel_getUid("setHidesOnDeactivate:"), shouldHide);
            }
        }
    });
}
 
void VuoEditorComposition::updatePortPopovers(VuoRendererNode *node)
{
    dispatch_sync(activePortPopoversQueue, ^{
        for (map<string, VuoPortPopover *>::iterator i = activePortPopovers.begin(); i != activePortPopovers.end(); ++i)
        {
            string portID = i->first;
            VuoPortPopover *popover = i->second;
            bool shouldUpdate = false;
 
            if (! node)
                shouldUpdate = true;
            else
            {
                identifierCache->doForPortWithIdentifier(portID, [&shouldUpdate, node](VuoPort *port) {
                    shouldUpdate = port->hasRenderer() && (port->getRenderer()->getUnderlyingParentNode() == node);
                });
            }
 
            if (shouldUpdate)
                QMetaObject::invokeMethod(popover, "updateTextAndResize", Qt::QueuedConnection);
        }
    });
}
 
void VuoEditorComposition::updateDataInPortPopoverFromRunningTopLevelComposition(VuoEditorComposition *popoverComposition,
                                                                                 string popoverCompositionIdentifier,
                                                                                 string portID)
{
    bool isInput;
    bool foundPort = popoverComposition->identifierCache->doForPortWithIdentifier(portID, [&isInput](VuoPort *port) {
        isInput = port->getRenderer()->getInput();
    });
 
    if (! foundPort)
        return;
 
    string portSummary = (isInput ?
                              runner->subscribeToInputPortTelemetry(popoverCompositionIdentifier, portID) :
                              runner->subscribeToOutputPortTelemetry(popoverCompositionIdentifier, portID));
 
    dispatch_async(popoverComposition->activePortPopoversQueue, ^{
        VuoPortPopover *popover = popoverComposition->getActivePopoverForPort(portID);
        if (popover)
        {
            QMetaObject::invokeMethod(popover, "updateDataValueImmediately", Qt::QueuedConnection, Q_ARG(QString, portSummary.c_str()));
            QMetaObject::invokeMethod(popover, "setCompositionRunning", Qt::QueuedConnection, Q_ARG(bool, true), Q_ARG(bool, false));
        }
    });
}
 
void VuoEditorComposition::updateDataInPortPopover(string portID)
{
    static_cast<VuoEditor *>(qApp)->getSubcompositionRouter()->applyToLinkedTopLevelComposition(this, ^void (VuoEditorComposition *topLevelComposition, string thisCompositionIdentifier)
    {
        dispatch_sync(topLevelComposition->runCompositionQueue, ^{
            if (topLevelComposition->isRunningThreadUnsafe())
                topLevelComposition->updateDataInPortPopoverFromRunningTopLevelComposition(this, thisCompositionIdentifier, portID);
        });
    });
}
 
void VuoEditorComposition::receivedTelemetryInputPortUpdated(string compositionIdentifier, string portIdentifier,
                                                             bool receivedEvent, bool receivedData, string dataSummary)
{
    void (^updatePortDisplay)(VuoEditorComposition *) = ^void (VuoEditorComposition *matchingComposition)
    {
        dispatch_sync(matchingComposition->activePortPopoversQueue, ^{
            VuoPortPopover *popover = matchingComposition->getActivePopoverForPort(portIdentifier);
            if (popover)
               QMetaObject::invokeMethod(popover, "updateLastEventTimeAndDataValue", Qt::QueuedConnection,
                                         Q_ARG(bool, receivedEvent),
                                         Q_ARG(bool, receivedData),
                                         Q_ARG(QString, dataSummary.c_str()));
        });
    };
    static_cast<VuoEditor *>(qApp)->getSubcompositionRouter()->applyToLinkedCompositionWithIdentifier(this, compositionIdentifier, updatePortDisplay);
}
 
void VuoEditorComposition::receivedTelemetryOutputPortUpdated(string compositionIdentifier, string portIdentifier,
                                                              bool sentEvent, bool sentData, string dataSummary)
{
    void (^updatePortDisplay)(VuoEditorComposition *) = ^void (VuoEditorComposition *matchingComposition)
    {
        dispatch_sync(matchingComposition->activePortPopoversQueue, ^{
            VuoPortPopover *popover = matchingComposition->getActivePopoverForPort(portIdentifier);
            if (popover)
                QMetaObject::invokeMethod(popover, "updateLastEventTimeAndDataValue", Qt::QueuedConnection,
                                          Q_ARG(bool, sentEvent),
                                          Q_ARG(bool, sentData),
                                          Q_ARG(QString, dataSummary.c_str()));
        });
 
        if (matchingComposition->showEventsMode && sentEvent)
        {
            matchingComposition->identifierCache->doForPortWithIdentifier(portIdentifier, [matchingComposition](VuoPort *port) {
                if (dynamic_cast<VuoCompilerTriggerPort *>(port->getCompiler()) && port->hasRenderer())
                {
                    port->getRenderer()->setFiredEvent();
                    matchingComposition->animatePort(port->getRenderer());
                }
            });
        }
    };
    static_cast<VuoEditor *>(qApp)->getSubcompositionRouter()->applyToLinkedCompositionWithIdentifier(this, compositionIdentifier, updatePortDisplay);
}
 
void VuoEditorComposition::receivedTelemetryEventDropped(string compositionIdentifier, string portIdentifier)
{
    void (^updatePortDisplay)(VuoEditorComposition *) = ^void (VuoEditorComposition *matchingComposition)
    {
        dispatch_async(matchingComposition->runCompositionQueue, ^{
            if (matchingComposition->isRunningThreadUnsafe())
            {
                dispatch_sync(matchingComposition->activePortPopoversQueue, ^{
                    VuoPortPopover *popover = matchingComposition->getActivePopoverForPort(portIdentifier);
                    if (popover)
                        QMetaObject::invokeMethod(popover, "incrementDroppedEventCount", Qt::QueuedConnection);
                });
            }
        });
    };
    static_cast<VuoEditor *>(qApp)->getSubcompositionRouter()->applyToLinkedCompositionWithIdentifier(this, compositionIdentifier, updatePortDisplay);
}
 
void VuoEditorComposition::receivedTelemetryNodeExecutionStarted(string compositionIdentifier, string nodeIdentifier)
{
    void (^updateNodeDisplay)(VuoEditorComposition *) = ^void (VuoEditorComposition *matchingComposition)
    {
        if (matchingComposition->showEventsMode)
        {
            dispatch_async(this->runCompositionQueue, ^{
                if (this->isRunningThreadUnsafe())
                {
                    matchingComposition->identifierCache->doForNodeWithIdentifier(nodeIdentifier, [](VuoNode *node) {
                        node->getRenderer()->setExecutionBegun();
                    });
                }
            });
        }
    };
    static_cast<VuoEditor *>(qApp)->getSubcompositionRouter()->applyToLinkedCompositionWithIdentifier(this, compositionIdentifier, updateNodeDisplay);
}
 
void VuoEditorComposition::receivedTelemetryNodeExecutionFinished(string compositionIdentifier, string nodeIdentifier)
{
    void (^updateNodeDisplay)(VuoEditorComposition *) = ^void (VuoEditorComposition *matchingComposition)
    {
        if (matchingComposition->showEventsMode)
        {
            dispatch_async(this->runCompositionQueue, ^{
                if (this->isRunningThreadUnsafe())
                {
                    matchingComposition->identifierCache->doForNodeWithIdentifier(nodeIdentifier, [](VuoNode *node) {
                        node->getRenderer()->setExecutionEnded();
                    });
                }
           });
        }
    };
    static_cast<VuoEditor *>(qApp)->getSubcompositionRouter()->applyToLinkedCompositionWithIdentifier(this, compositionIdentifier, updateNodeDisplay);
}
 
void VuoEditorComposition::lostContactWithComposition(void)
{
    emit compositionStoppedItself();
}
 
void VuoEditorComposition::updateGeometryForAllComponents()
{
    VuoRendererComposition::updateGeometryForAllComponents();
}
 
bool VuoEditorComposition::getShowEventsMode()
{
    return showEventsMode;
}
 
void VuoEditorComposition::setShowEventsMode(bool showEventsMode)
{
    this->showEventsMode = showEventsMode;
 
    if (showEventsMode)
    {
        beginDisplayingActivity();
 
        void (^subscribe)(VuoEditorComposition *, string) = ^void (VuoEditorComposition *topLevelComposition, string thisCompositionIdentifier)
        {
            dispatch_sync(topLevelComposition->runCompositionQueue, ^{
                if (topLevelComposition->isRunningThreadUnsafe())
                    topLevelComposition->runner->subscribeToEventTelemetry(thisCompositionIdentifier);
            });
        };
        static_cast<VuoEditor *>(qApp)->getSubcompositionRouter()->applyToLinkedTopLevelComposition(this, subscribe);
    }
    else
    {
        stopDisplayingActivity();
 
        void (^unsubscribe)(VuoEditorComposition *, string) = ^void (VuoEditorComposition *topLevelComposition, string thisCompositionIdentifier)
        {
            dispatch_sync(topLevelComposition->runCompositionQueue, ^{
                if (topLevelComposition->isRunningThreadUnsafe())
                    topLevelComposition->runner->unsubscribeFromEventTelemetry(thisCompositionIdentifier);
            });
        };
        static_cast<VuoEditor *>(qApp)->getSubcompositionRouter()->applyToLinkedTopLevelComposition(this, unsubscribe);
    }
}
 
bool VuoEditorComposition::hasHiddenInternalCables()
{
    foreach (VuoCable *cable, getBase()->getCables())
    {
        if (cable->getCompiler()->getHidden() && !cable->isPublished())
            return true;
    }
 
    return false;
}
 
bool VuoEditorComposition::hasHiddenPublishedCables()
{
    foreach (VuoCable *cable, getBase()->getCables())
    {
        if (cable->hasRenderer() && cable->getRenderer()->getEffectivelyWireless() && cable->isPublished())
            return true;
    }
 
    return false;
}
 
QGraphicsItemAnimation * VuoEditorComposition::setUpAnimationForPort(QGraphicsItemAnimation *animation, VuoRendererPort *port)
{
    VuoRendererPort *animatedPort = new VuoRendererPort(new VuoPort(port->getBase()->getClass()),
                                                        NULL,
                                                        port->getOutput(),
                                                        port->getRefreshPort(),
                                                        port->getFunctionPort());
    animatedPort->setAnimated(true);
    animatedPort->setZValue(VuoRendererItem::triggerAnimationZValue);
    animatedPort->setParentItem(port->getRenderedParentNode());
 
    animation->setItem(animatedPort);
    animation->setScaleAt(0.0, 1, 1);
    animation->setScaleAt(0.999, 3, 3);
    animation->setScaleAt(1.0, 1, 1);
 
    QTimeLine *animationTimeline = animation->timeLine();
    animationTimeline->setFrameRange(0, 100);
    animationTimeline->setUpdateInterval(showEventsModeUpdateInterval);
    animationTimeline->setCurveShape(QTimeLine::LinearCurve);
 
    preparedAnimations.insert(animation);
    animationForTimeline[animation->timeLine()] = animation;
 
    connect(animationTimeline, &QTimeLine::valueChanged, this, &VuoEditorComposition::updatePortAnimation);
    connect(animationTimeline, &QTimeLine::finished, this, &VuoEditorComposition::endPortAnimation);
 
    return animation;
}
 
void VuoEditorComposition::animatePort(VuoRendererPort *port)
{
    dispatch_async(dispatch_get_main_queue(), ^{
    QGraphicsItemAnimation *animation = getAvailableAnimationForPort(port);
    if (! animation)
        return;
 
    VuoRendererPort *animatedPort = (VuoRendererPort *)(animation->item());
 
    if (animation->timeLine()->state() == QTimeLine::Running)
        animation->timeLine()->setCurrentTime(0);
 
    else
    {
        animatedPort->setPos(port->pos());
        animatedPort->setVisible(true);
        animation->timeLine()->start();
    }
    });
}
 
QGraphicsItemAnimation * VuoEditorComposition::getAvailableAnimationForPort(VuoRendererPort *port)
{
    vector<QGraphicsItemAnimation *> animations = port->getAnimations();
 
    QGraphicsItemAnimation *mostAdvancedAnimation = NULL;
    qreal maxPercentAdvanced = -1;
 
    for (int i = 0; i < animations.size(); ++i)
    {
        QGraphicsItemAnimation *animation = animations[i];
        bool animationPrepared = (preparedAnimations.find(animation) != preparedAnimations.end());
        bool animationRunning = (animation->timeLine()->state() == QTimeLine::Running);
 
        if (! animationPrepared)
            return setUpAnimationForPort(animation, port);
 
        else if (! animationRunning)
            return animation;
 
        // If all of the port's animations are already running, return the
        // one that has been running the longest.
        qreal percentAdvanced = animation->timeLine()->currentValue();
        if (percentAdvanced > maxPercentAdvanced)
        {
            mostAdvancedAnimation = animation;
            maxPercentAdvanced = percentAdvanced;
        }
    }
 
    // If no animation is even halfway complete, return NULL to indicate
    // that no animation is currently available.
    return (maxPercentAdvanced >= 0.5? mostAdvancedAnimation : NULL);
}
 
void VuoEditorComposition::updatePortAnimation(qreal value)
{
    QTimeLine *animationTimeline = (QTimeLine *)sender();
    QGraphicsItemAnimation *animation = animationForTimeline[animationTimeline];
    VuoRendererPort *animatedPort = (VuoRendererPort *)(animation->item());
    const qreal multiplier = 1000.;
    animatedPort->setFadePercentageSinceEventFired(pow((multiplier*value),2)/pow(multiplier,2));
}
 
void VuoEditorComposition::endPortAnimation(void)
{
    QTimeLine *animationTimeline = (QTimeLine *)sender();
    QGraphicsItemAnimation *animation = animationForTimeline[animationTimeline];
    VuoRendererPort *animatedPort = (VuoRendererPort *)(animation->item());
    animatedPort->setVisible(false);
}
 
void VuoEditorComposition::setDisableDragStickiness(bool disable)
{
    this->dragStickinessDisabled = disable;
}
 
void VuoEditorComposition::setIgnoreApplicationStateChangeEvents(bool ignore)
{
    this->ignoreApplicationStateChangeEvents = ignore;
}
 
void VuoEditorComposition::setPopoverEventsEnabled(bool enable)
{
    this->popoverEventsEnabled = enable;
}
 
void VuoEditorComposition::beginDisplayingActivity(bool includePorts)
{
    setRenderActivity(true, includePorts);
    refreshComponentAlphaLevelTimer->start();
}
 
void VuoEditorComposition::stopDisplayingActivity()
{
    refreshComponentAlphaLevelTimer->stop();
    setRenderActivity(false);
}
 
bool VuoEditorComposition::validateProtocol(VuoEditorWindow *window, bool isExportingMovie)
{
    // This should never happen if we've enabled the "Export" menu options in the appropriate contexts.
    if (!activeProtocol)
    {
        VuoErrorDialog::show(window, "To export, activate a protocol.", "");
        return false;
    }
 
    // Can events from at least one trigger reach at least one published output port? If not, report an error.
    if (! getBase()->getCompiler()->getCachedGraph()->mayEventsReachPublishedOutputPorts())
    {
        QString errorHeadline = tr("<b>This composition doesn't send any images to <code>outputImage</code>.</b>");
        QString errorDetails = tr("<p>To export, your composition should use the data and events from the published input ports "
                "to output a stream of images through the <code>outputImage</code> published output port.</p>");
 
        if (isExportingMovie)
            errorDetails.append("<p>Alternatively, you can record a realtime movie by running the composition and selecting File > Start Recording.</p>");
 
        VuoRendererFonts *fonts = VuoRendererFonts::getSharedFonts();
        QMessageBox messageBox(window);
        messageBox.setWindowFlags(Qt::Sheet);
        messageBox.setWindowModality(Qt::WindowModal);
        messageBox.setFont(fonts->dialogHeadingFont());
        messageBox.setTextFormat(Qt::RichText);
 
        messageBox.setStandardButtons(QMessageBox::Help | QMessageBox::Ok);
        messageBox.setButtonText(QMessageBox::Help, tr("Open an Example"));
        messageBox.setButtonText(QMessageBox::Ok, tr("OK"));
        messageBox.setDefaultButton(QMessageBox::Ok);
 
        messageBox.setText(errorHeadline);
        messageBox.setInformativeText("<style>p{" + fonts->getCSS(fonts->dialogBodyFont()) + "}</style>" + errorDetails);
 
        if (messageBox.exec() == QMessageBox::Help)
        {
            map<QString, QString> examples = static_cast<VuoEditor *>(qApp)->getExampleCompositionsForProtocol(activeProtocol);
            map<QString, QString>::iterator i = examples.begin();
            if (i != examples.end())
                QDesktopServices::openUrl(QUrl(VuoEditor::getURLForExampleComposition(i->first, i->second)));
        }
        return false;
    }
 
    return true;
}
 
string VuoEditorComposition::takeSnapshot(void)
{
    return (getBase()->hasCompiler()? getBase()->getCompiler()->getGraphvizDeclaration(getActiveProtocol(), generateCompositionHeader()) : "");
}
 
string VuoEditorComposition::generateCompositionHeader()
{
    return getBase()->getMetadata()->toCompositionHeader() + VuoCompilerComposition::defaultGraphDeclaration;
}
 
string VuoEditorComposition::getDefaultNameForPath(const string &compositionPath)
{
    string dir, file, ext;
    VuoFileUtilities::splitPath(compositionPath, dir, file, ext);
    return file;
}
 
QString VuoEditorComposition::getFormattedName()
{
    string customizedName = getBase()->getMetadata()->getCustomizedName();
    if (! customizedName.empty())
        return QString::fromStdString(customizedName);
 
    string name = getBase()->getMetadata()->getName();
    return formatCompositionFileNameForDisplay(QString::fromStdString(name));
}
 
QString VuoEditorComposition::formatCompositionFileNameForDisplay(QString unformattedCompositionFileName)
{
    // Remove the file extension. Do this correctly even for subcompositions whose filenames contain dot-delimited segments.
    // If the extensionless filename contains dot-delimited segments, use only the final segment.
    vector<string> fileNameParts = VuoStringUtilities::split(unformattedCompositionFileName.toUtf8().constData(), '.');
    string fileNameContentPart = (fileNameParts.size() >= 2 && fileNameParts[fileNameParts.size()-1] == "vuo"?
                                     fileNameParts[fileNameParts.size()-2] :
                                 (fileNameParts.size() >= 1? fileNameParts[fileNameParts.size()-1] : ""));
 
    // If the filename already contains spaces, init-cap the first word but otherwise leave the formatting alone.
    if (QRegExp("\\s").indexIn(fileNameContentPart.c_str()) != -1)
    {
        string formattedName = fileNameContentPart;
        if (formattedName.size() >= 1)
            formattedName[0] = toupper(formattedName[0]);
 
        return QString(formattedName.c_str());
    }
 
    // Otherwise, init-cap the first word and insert spaces among CamelCase transitions.
    return QString(VuoStringUtilities::expandCamelCase(fileNameContentPart).c_str());
}
 
QString VuoEditorComposition::formatNodeSetNameForDisplay(QString nodeSetName)
{
    QStringList wordsInName = nodeSetName.split(QRegularExpression("\\."));
    if (wordsInName.size() < 2 || wordsInName[0] != "vuo")
    {
        // If not an official Vuo nodeset, return the name as-is.
        return nodeSetName;
    }
 
    map<QString, QString> wordsToReformat;
    wordsToReformat["artnet"] = "Art-Net";
    wordsToReformat["bcf2000"] = "BCF2000";
    wordsToReformat["hid"] = "HID";
    wordsToReformat["midi"] = "MIDI";
    wordsToReformat["ndi"] = "NDI";
    wordsToReformat["osc"] = "OSC";
    wordsToReformat["rss"] = "RSS";
    wordsToReformat["ui"] = "UI";
    wordsToReformat["url"] = "URL";
 
    QString nodeSetDisplayName = "";
    for (int i = 1; i < wordsInName.size(); ++i)
    {
        QString currentWord = wordsInName[i];
        if (currentWord.size() >= 1)
        {
            if (wordsToReformat.find(currentWord.toLower()) != wordsToReformat.end())
                currentWord = wordsToReformat.at(currentWord.toLower());
            else
                currentWord[0] = currentWord[0].toUpper();
 
            nodeSetDisplayName += currentWord;
 
            if (i < wordsInName.size()-1)
                nodeSetDisplayName += " ";
        }
    }
    return nodeSetDisplayName;
}
 
QString VuoEditorComposition::formatTypeNameForDisplay(VuoType *type)
{
    if (!type)
        return "(none)";
 
    string formattedTypeName = "";
    if (type->hasCompiler() && VuoCompilerType::isListType(type->getCompiler()))
    {
        string innerTypeName = VuoType::extractInnermostTypeName(type->getModuleKey());
        VuoCompilerType *innerType = compiler->getType(innerTypeName);
        if (innerType)
        {
            string formattedInnerTypeName = innerType->getBase()->getDefaultTitle();
            formattedTypeName = "List of " + formattedInnerTypeName + " elements";
        }
    }
    else
        formattedTypeName = type->getDefaultTitle();
 
    return formattedTypeName.c_str();
}
 
string VuoEditorComposition::getDefaultPublishedPortNameForType(VuoType *type)
{
    if (!type)
        return "Event";
 
    // Special handling for points and transforms so that the initial numeral in their display name doesn't get sanitized away.
    else if (type->getDefaultTitle() == "2D Point")
        return "Point2D";
    else if (type->getDefaultTitle() == "3D Point")
        return "Point3D";
    else if (type->getDefaultTitle() == "4D Point")
        return "Point4D";
    else if (type->getDefaultTitle() == "2D Transform")
        return "Transform2D";
    else if (type->getDefaultTitle() == "3D Transform")
        return "Transform3D";
 
    return VuoRendererPort::sanitizePortIdentifier(formatTypeNameForDisplay(type)).toUtf8().constData();
}
 
bool VuoEditorComposition::nodeSetMenuActionLessThan(QAction *action1, QAction *action2)
{
    QString item1Text = action1->text();
    QString item2Text = action2->text();
 
    // Ignore list prefixes
    const QString listPrefix = "List of ";
    const QString builtInTypePrefix = "Vuo";
 
    if (item1Text.startsWith(listPrefix))
    {
        item1Text.remove(0, listPrefix.length());
        if (item1Text.startsWith(builtInTypePrefix))
            item1Text.remove(0, builtInTypePrefix.length());
    }
 
    if (item2Text.startsWith(listPrefix))
    {
        item2Text.remove(0, listPrefix.length());
        if (item2Text.startsWith(builtInTypePrefix))
            item2Text.remove(0, builtInTypePrefix.length());
    }
 
    // Sort alphabetically by title.
    return (item1Text.compare(item2Text, Qt::CaseInsensitive) < 0);
}
 
bool VuoEditorComposition::itemHigherOnCanvas(QGraphicsItem *item1, QGraphicsItem *item2)
{
    qreal item1Y = item1->scenePos().y();
    qreal item2Y = item2->scenePos().y();
 
    qreal item1X = item1->scenePos().x();
    qreal item2X = item2->scenePos().x();
 
    if (item1Y == item2Y)
        return (item1X < item2X);
 
    return item1Y < item2Y;
}
 
double VuoEditorComposition::calculateNodeSimilarity(VuoNodeClass *node1, VuoNodeClass *node2)
{
    // Assign replacement (successor) node classes a perfect match score.
    {
        string originalGenericNode1ClassName, originalGenericNode2ClassName;
        if (node1->hasCompiler() && dynamic_cast<VuoCompilerSpecializedNodeClass *>(node1->getCompiler()))
            originalGenericNode1ClassName = dynamic_cast<VuoCompilerSpecializedNodeClass *>(node1->getCompiler())->getOriginalGenericNodeClassName();
        else
            originalGenericNode1ClassName = node1->getClassName();
 
        if (node2->hasCompiler() && dynamic_cast<VuoCompilerSpecializedNodeClass *>(node2->getCompiler()))
            originalGenericNode2ClassName = dynamic_cast<VuoCompilerSpecializedNodeClass *>(node2->getCompiler())->getOriginalGenericNodeClassName();
        else
            originalGenericNode2ClassName = node2->getClassName();
 
        if (VuoEditorUtilities::isNodeClassSuccessorTo(originalGenericNode1ClassName.c_str(), originalGenericNode2ClassName.c_str()))
            return 1;
    }
 
    // Compare keywords.
    vector<string> node1Keywords = node1->getKeywords();
    vector<string> node2Keywords = node2->getKeywords();
 
    // Compare node set names.
    if (node1->getNodeSet())
        node1Keywords.push_back(node1->getNodeSet()->getName());
 
    if (node2->getNodeSet())
        node2Keywords.push_back(node2->getNodeSet()->getName());
 
    // Compare tokens in node class display names.
    foreach (QString nodeTitleToken, VuoNodeLibrary::tokenizeNodeName(node1->getDefaultTitle().c_str(), ""))
        if (!VuoNodeLibrary::isStopWord(nodeTitleToken.toLower()))
            node1Keywords.push_back(nodeTitleToken.toLower().toUtf8().constData());
 
    foreach (QString nodeTitleToken, VuoNodeLibrary::tokenizeNodeName(node2->getDefaultTitle().c_str(), ""))
        if (!VuoNodeLibrary::isStopWord(nodeTitleToken.toLower()))
            node2Keywords.push_back(nodeTitleToken.toLower().toUtf8().constData());
 
    set<string> node1KeywordSet(node1Keywords.begin(), node1Keywords.end());
    set<string> node2KeywordSet(node2Keywords.begin(), node2Keywords.end());
 
    set<string> nodeKeywordsIntersection;
    std::set_intersection(node1KeywordSet.begin(), node1KeywordSet.end(),
                          node2KeywordSet.begin(), node2KeywordSet.end(),
                          std::inserter(nodeKeywordsIntersection, nodeKeywordsIntersection.end()));
 
    set<string> nodeKeywordsUnion = node1KeywordSet;
    nodeKeywordsUnion.insert(node2KeywordSet.begin(), node2KeywordSet.end());
 
    // Avoid division by zero.
    if (nodeKeywordsUnion.size() == 0)
        return 0;
 
    // Calculate Jaccard similarity.
    double nodeSimilarity = nodeKeywordsIntersection.size()/(1.0*nodeKeywordsUnion.size());
 
    return nodeSimilarity;
}
 
void VuoEditorComposition::emitCompositionOnTop(bool top)
{
    emit compositionOnTop(top);
}
 
void VuoEditorComposition::emitPublishedPortNameEditorRequested(VuoRendererPublishedPort *port)
{
    emit publishedPortNameEditorRequested(port, false);
}
 
VuoEditorComposition::~VuoEditorComposition()
{
    dispatch_sync(runCompositionQueue, ^{});
    dispatch_release(runCompositionQueue);
 
    preparedAnimations.clear();
    animationForTimeline.clear();
 
    delete identifierCache;
 
    moduleManager->deleteWhenReady();  // deletes compiler
}
 
void VuoEditorComposition::setColor(bool isDark)
{
    // Update the canvas color.
    setBackgroundTransparent(false);
 
    // Force repainting the entire canvas.
    setComponentCaching(QGraphicsItem::NoCache);
    updateGeometryForAllComponents();
    setComponentCaching(getCurrentDefaultCacheMode());
}
 
map<string, string> VuoEditorComposition::publishPorts(set<string> portsToPublish)
{
    vector<VuoRendererPort *> sortedPortsToPublish;
    foreach (string portID, portsToPublish)
    {
        VuoPort *port = getPortWithStaticIdentifier(portID);
        if (port && port->hasRenderer())
            sortedPortsToPublish.push_back(port->getRenderer());
    }
    std::sort(sortedPortsToPublish.begin(), sortedPortsToPublish.end(), itemHigherOnCanvas);
 
    map<string, string> publishedPortNames;
    foreach (VuoRendererPort *rp, sortedPortsToPublish)
    {
        rp->updateGeometry();
        VuoType *publishedPortType = ((VuoCompilerPortClass *)(rp->getBase()->getClass()->getCompiler()))->getDataVuoType();
 
        string specializedPublishedPortName = generateSpecialPublishedNameForPort(rp->getBase());
        string publishedPortName = (!specializedPublishedPortName.empty()?
                                        specializedPublishedPortName :
                                        VuoRendererPort::sanitizePortIdentifier(rp->getPortNameToRenderWhenDisplayed().c_str()).toUtf8().constData());
 
        bool forceEventOnlyPublication = rp->effectivelyHasConnectedDataCable(false);
        VuoRendererPort *publishedPort = publishInternalPort(rp->getBase(), forceEventOnlyPublication, publishedPortName, publishedPortType, false);
 
        publishedPortNames[getIdentifierForStaticPort(rp->getBase())] = publishedPort->getBase()->getClass()->getName();
    }
 
    return publishedPortNames;
}
 
string VuoEditorComposition::generateSpecialPublishedNameForPort(VuoPort *port)
{
    if (!port || !port->hasRenderer() || !port->getRenderer()->getUnderlyingParentNode())
        return "";
 
    // If publishing a port on a "Share Value" node and the node's title has been
    // customized, request that title as the published port name.
    if (VuoStringUtilities::beginsWith(port->getRenderer()->getUnderlyingParentNode()->getBase()->getNodeClass()->getClassName(), "vuo.data.share") &&
            (port->getRenderer()->getUnderlyingParentNode()->getBase()->getTitle() !=
            port->getRenderer()->getUnderlyingParentNode()->getBase()->getNodeClass()->getDefaultTitle()))
    {
        return VuoRendererPort::sanitizePortIdentifier(port->getRenderer()->getUnderlyingParentNode()->getBase()->getTitle().c_str()).toUtf8().constData();
    }
 
    return "";
}
 
void VuoEditorComposition::repositionPopover()
{
        VuoPortPopover *popover = static_cast<VuoPortPopover *>(QObject::sender());
        if (popover && !popover->getDetached())
        {
            const int cutoffMargin = 16;
            if (popover->pos().x()+popover->size().width()+cutoffMargin > views()[0]->viewport()->rect().right())
                popover->move(QPoint(views()[0]->viewport()->rect().right()-popover->size().width()-cutoffMargin, popover->pos().y()));
 
            if (popover->pos().y()+popover->size().height()+cutoffMargin > views()[0]->viewport()->rect().bottom())
                popover->move(QPoint(popover->pos().x(), views()[0]->viewport()->rect().bottom()-popover->size().height()-cutoffMargin));
        }
}