VuoPopover.cc

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#include "VuoPopover.hh"
 
#ifdef __APPLE__
#include <objc/runtime.h>
#endif
 
VuoPopover::VuoPopover(QWidget *parent) :
    QWidget(parent)
{
}
 
int VuoPopover::popoverArrowHalfWidth = 12; 
 
QPainterPath VuoPopover::getPopoverPath(Qt::AnchorPoint arrowSide, int arrowPixelsFromTopOrLeft)
{
    int cornerRadius = 8;
 
    QPainterPath path;
 
    bool omitArrow = ((arrowPixelsFromTopOrLeft < cornerRadius) ||
                      (arrowPixelsFromTopOrLeft > (((arrowSide == Qt::AnchorTop) ||
                                                    (arrowSide == Qt::AnchorBottom))?
                                                       width() :
                                                       height())
                                                    - cornerRadius));
 
    if (arrowSide == Qt::AnchorTop)
    {
        path.moveTo(arrowPixelsFromTopOrLeft-popoverArrowHalfWidth,popoverArrowHalfWidth);
 
        if (!omitArrow)
            path.lineTo(arrowPixelsFromTopOrLeft,0);
 
        path.lineTo(arrowPixelsFromTopOrLeft+popoverArrowHalfWidth,popoverArrowHalfWidth);
        path.lineTo(width()-cornerRadius,popoverArrowHalfWidth);
        path.cubicTo(width(),popoverArrowHalfWidth, width(),popoverArrowHalfWidth, width(),popoverArrowHalfWidth+cornerRadius);
        path.lineTo(width(),height()-cornerRadius);
        path.cubicTo(width(),height(), width(),height(), width()-cornerRadius,height());
        path.lineTo(cornerRadius,height());
        path.cubicTo(0,height(), 0,height(), 0,height()-cornerRadius);
        path.lineTo(0,popoverArrowHalfWidth+cornerRadius);
        path.cubicTo(0,popoverArrowHalfWidth, 0,popoverArrowHalfWidth, cornerRadius,popoverArrowHalfWidth);
        path.closeSubpath();
    }
    else if (arrowSide == Qt::AnchorRight)
    {
        path.moveTo(width()-popoverArrowHalfWidth-cornerRadius,0);
        path.cubicTo(width()-popoverArrowHalfWidth,0, width()-popoverArrowHalfWidth,0, width()-popoverArrowHalfWidth,cornerRadius);
        path.lineTo(width()-popoverArrowHalfWidth,arrowPixelsFromTopOrLeft-popoverArrowHalfWidth);
 
        if (!omitArrow)
            path.lineTo(width(),arrowPixelsFromTopOrLeft);
 
        path.lineTo(width()-popoverArrowHalfWidth,arrowPixelsFromTopOrLeft+popoverArrowHalfWidth);
        path.lineTo(width()-popoverArrowHalfWidth,height()-cornerRadius);
        path.cubicTo(width()-popoverArrowHalfWidth,height(), width()-popoverArrowHalfWidth,height(), width()-popoverArrowHalfWidth-cornerRadius,height());
        path.lineTo(cornerRadius,height());
        path.cubicTo(0,height(), 0,height(), 0,height()-cornerRadius);
        path.lineTo(0,cornerRadius);
        path.cubicTo(0,0, 0,0, cornerRadius,0);
        path.closeSubpath();
    }
    else if (arrowSide == Qt::AnchorBottom)
    {
        path.moveTo(width()-cornerRadius,0);
        path.cubicTo(width(),0, width(),0, width(),cornerRadius);
        path.lineTo(width(),height()-popoverArrowHalfWidth-cornerRadius);
        path.cubicTo(width(),height()-popoverArrowHalfWidth, width(),height()-popoverArrowHalfWidth, width()-cornerRadius,height()-popoverArrowHalfWidth);
        path.lineTo(arrowPixelsFromTopOrLeft+popoverArrowHalfWidth,height()-popoverArrowHalfWidth);
 
        if (!omitArrow)
            path.lineTo(arrowPixelsFromTopOrLeft,height());
 
        path.lineTo(arrowPixelsFromTopOrLeft-popoverArrowHalfWidth,height()-popoverArrowHalfWidth);
        path.lineTo(cornerRadius,height()-popoverArrowHalfWidth);
        path.cubicTo(0,height()-popoverArrowHalfWidth, 0,height()-popoverArrowHalfWidth, 0,height()-popoverArrowHalfWidth-cornerRadius);
        path.lineTo(0,cornerRadius);
        path.cubicTo(0,0, 0,0, cornerRadius,0);
        path.closeSubpath();
    }
    else if (arrowSide == Qt::AnchorLeft)
    {
        path.moveTo(width()-cornerRadius,0);
        path.cubicTo(width(),0, width(),0, width(),cornerRadius);
        path.lineTo(width(),height()-cornerRadius);
        path.cubicTo(width(),height(), width(),height(), width()-cornerRadius,height());
        path.lineTo(popoverArrowHalfWidth+cornerRadius,height());
        path.cubicTo(popoverArrowHalfWidth,height(), popoverArrowHalfWidth,height(), popoverArrowHalfWidth,height()-cornerRadius);
        path.lineTo(popoverArrowHalfWidth,arrowPixelsFromTopOrLeft+popoverArrowHalfWidth);
 
        if (!omitArrow)
            path.lineTo(0,arrowPixelsFromTopOrLeft);
 
        path.lineTo(popoverArrowHalfWidth,arrowPixelsFromTopOrLeft-popoverArrowHalfWidth);
        path.lineTo(popoverArrowHalfWidth,cornerRadius);
        path.cubicTo(popoverArrowHalfWidth,0, popoverArrowHalfWidth,0, popoverArrowHalfWidth+cornerRadius,0);
        path.closeSubpath();
    }
 
    return path;
}
 
QMargins VuoPopover::getPopoverContentsMargins(Qt::AnchorPoint arrowSide)
{
    return QMargins(
                5 + (arrowSide==Qt::AnchorLeft   ? popoverArrowHalfWidth : 0),
                5 + (arrowSide==Qt::AnchorTop    ? popoverArrowHalfWidth : 0),
                5 + (arrowSide==Qt::AnchorRight  ? popoverArrowHalfWidth : 0),
                5 + (arrowSide==Qt::AnchorBottom ? popoverArrowHalfWidth : 0)
                                                );
}
 
void * VuoPopover::getWindowForPopover(QWidget *popoverWidget)
{
    id view = (id)popoverWidget->winId();
 
    // window = [view window];
    Class nsView = (Class)objc_getClass("NSView");
    SEL windowSEL = sel_registerName("window");
    Method nsViewWindowMethod = class_getInstanceMethod(nsView, windowSEL);
    IMP nsViewWindow = method_getImplementation(nsViewWindowMethod);
    void *window = nsViewWindow(view, method_getName(nsViewWindowMethod));
 
    return window;
}
 
void VuoPopover::setWindowLevelAndVisibility(bool top, QWidget *popoverWidget)
{
    setWindowLevelForNextUpdate(top, popoverWidget);
 
    if (!top)
        popoverWidget->lower();
}
 
void VuoPopover::setWindowLevel(bool top, QWidget *popoverWidget)
{
    setWindowLevelForNextUpdate(top, popoverWidget);
 
    if (!top)
    {
        // lower()ing forces re-evaluation of the window level, but, unlike raise(),
        // does not cause the application to receive an ApplicationActivate event in Qt 5.3.
        popoverWidget->lower();
 
        // lower()ing effectively hides the popover; reverse that side effect.
        popoverWidget->hide();
        popoverWidget->show();
    }
}
 
void VuoPopover::setWindowLevelForNextUpdate(bool top, QWidget *popoverWidget)
{
    void *window = getWindowForPopover(popoverWidget);
 
    // [window setLevel:...];
    Class nsWindow = (Class)objc_getClass("NSWindow");
    SEL setLevelSEL = sel_registerName("setLevel:");
    Method nsWindowSetLevelMethod = class_getInstanceMethod(nsWindow, setLevelSEL);
    IMP nsWindowSetLevel = method_getImplementation(nsWindowSetLevelMethod);
    int key;
    if (top)
        key = 8; // kCGMainMenuWindowLevelKey
    else
        key = 0; // Anything higher than zero seems to float..?
    nsWindowSetLevel((id)window, method_getName(nsWindowSetLevelMethod), key);
}