VuoGraphicsWindow.m

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#import "module.h"
#import "VuoApp.h"
#import "VuoGraphicsLayer.h"
#import "VuoGraphicsView.h"
#import "VuoGraphicsWindow.h"
#import "VuoGraphicsWindowDelegate.h"
#import "VuoGraphicsWindowDrag.h"
#import "VuoScreenCommon.h"
#import <Carbon/Carbon.h>
 
#ifdef VUO_COMPILER
VuoModuleMetadata({
    "title" : "VuoGraphicsWindow",
    "dependencies" : [
        "VuoGraphicsLayer",
        "VuoGraphicsView",
        "VuoGraphicsWindowDelegate",
        "VuoRenderedLayers",
        "VuoScreenCommon",
        "VuoWindowProperty",
        "VuoWindowRecorder",
        "VuoWindowReference",
        "VuoList_VuoWindowProperty"
    ]
});
#endif
 
const int VuoGraphicsWindowMinSize = 5;
 
const NSInteger VuoViewMenuItemTag = 1000; 
const NSInteger VuoFullScreenMenuItemTag = 1001; 
 
dispatch_semaphore_t VuoGraphicsWindow_fullScreenTransitionSemaphore;
 
static void __attribute__((constructor)) VuoGraphicsWindow_init()
{
     VuoGraphicsWindow_fullScreenTransitionSemaphore = dispatch_semaphore_create(1);
}
 
 
@interface VuoGraphicsWindow ()
@property(retain) NSMenuItem *recordMenuItem;  
@property(retain) id<NSWindowDelegate> privateDelegate;  
@property bool constrainToScreen;  
@end
 
@implementation VuoGraphicsWindow
 
- (instancetype)initWithInitCallback:(VuoGraphicsWindowInitCallback)initCallback
               updateBackingCallback:(VuoGraphicsWindowUpdateBackingCallback)updateBackingCallback
                      resizeCallback:(VuoGraphicsWindowResizeCallback)resizeCallback
                        drawCallback:(VuoGraphicsWindowDrawCallback)drawCallback
                            userData:(void *)userData
{
    NSRect mainScreenFrame = [[NSScreen mainScreen] frame];
    _contentRectWhenWindowed = NSMakeRect(mainScreenFrame.origin.x, mainScreenFrame.origin.y, VuoGraphicsWindowDefaultWidth, 768);
    _styleMaskWhenWindowed = NSTitledWindowMask | NSMiniaturizableWindowMask | NSResizableWindowMask;
    if (self = [super initWithContentRect:_contentRectWhenWindowed
                                styleMask:_styleMaskWhenWindowed
                                  backing:NSBackingStoreBuffered
                                    defer:NO])
    {
        self.colorSpace = NSColorSpace.sRGBColorSpace;
 
        self.privateDelegate = [[[VuoGraphicsWindowDelegate alloc] initWithWindow:self] autorelease];
        self.delegate = self.privateDelegate;
        self.releasedWhenClosed = NO;
 
        _cursor = VuoCursor_Pointer;
 
        self.contentMinSize = NSMakeSize(VuoGraphicsWindowMinSize, VuoGraphicsWindowMinSize);
 
        self.acceptsMouseMovedEvents = YES;
 
        self.collectionBehavior = NSWindowCollectionBehaviorFullScreenPrimary;
 
        [self initDrag];
        [self registerForDraggedTypes:@[NSFilenamesPboardType]];
 
        _userResizedWindow = NO;
        _programmaticallyResizingWindow = NO;
        _constrainToScreen = YES;
 
        char *title = VuoApp_getName();
        self.title = [NSString stringWithUTF8String:title];
        free(title);
 
        _backingScaleFactorCached = self.backingScaleFactor;
 
        VuoGraphicsLayer *l = [[VuoGraphicsLayer alloc] initWithWindow:self
                                                                initCallback:initCallback
                                                       updateBackingCallback:updateBackingCallback
                                                          backingScaleFactor:_backingScaleFactorCached
                                                              resizeCallback:resizeCallback
                                                                drawCallback:drawCallback
                                                                    userData:userData];
        l.contentsScale = _backingScaleFactorCached;
 
        VuoGraphicsView *v = [[VuoGraphicsView alloc] init];
        v.layer = l;
        [l release];
 
        self.contentView = v;
        [v release];
 
        _contentRectCached = l.frame;
    }
 
    return self;
}
 
- (void)draw
{
    NSView *v = self.contentView;
    __block VuoGraphicsLayer *l;
    VuoApp_executeOnMainThread(^{
        l = (VuoGraphicsLayer *)v.layer;
    });
    [l draw];
}
 
- (BOOL)canBecomeMainWindow
{
    return YES;
}
 
- (BOOL)canBecomeKeyWindow
{
    return YES;
}
 
- (void)updateFullScreenMenu
{
    NSMenuItem *fullScreenMenuItem = [[[[[NSApplication sharedApplication] mainMenu] itemWithTag:VuoViewMenuItemTag] submenu] itemWithTag:VuoFullScreenMenuItemTag];
    fullScreenMenuItem.title = self.isFullScreen ? @"Exit Full Screen" :  @"Enter Full Screen";
}
 
- (void)becomeMainWindow
{
    [super becomeMainWindow];
 
    if (!_isInMacFullScreenMode)
        [self setFullScreenPresentation:self.isFullScreen];
 
    NSMenu *fileMenu = [[[NSMenu alloc] initWithTitle:@"File"] autorelease];
    _recordMenuItem = [[NSMenuItem alloc] initWithTitle:@"" action:@selector(toggleRecording) keyEquivalent:@"e"];
    [_recordMenuItem setKeyEquivalentModifierMask:NSCommandKeyMask|NSAlternateKeyMask];
    [fileMenu addItem:_recordMenuItem];
    NSMenuItem *fileMenuItem = [[NSMenuItem new] autorelease];
    [fileMenuItem setSubmenu:fileMenu];
 
    NSMenu *viewMenu = [[[NSMenu alloc] initWithTitle:@"View"] autorelease];
    NSMenuItem *fullScreenMenuItem = [[[NSMenuItem alloc] initWithTitle:@"" action:@selector(toggleFullScreen) keyEquivalent:@"f"] autorelease];
    fullScreenMenuItem.tag = VuoFullScreenMenuItemTag;
    [viewMenu addItem:fullScreenMenuItem];
    NSMenuItem *viewMenuItem = [[NSMenuItem new] autorelease];
    viewMenuItem.tag = VuoViewMenuItemTag;
    [viewMenuItem setSubmenu:viewMenu];
 
    NSMenu *windowMenu = [[[NSMenu alloc] initWithTitle:@"Window"] autorelease];
    NSMenuItem *minimizeMenuItem = [[[NSMenuItem alloc] initWithTitle:@"Minimize" action:@selector(performMiniaturize:) keyEquivalent:@"m"] autorelease];
    NSMenuItem *zoomMenuItem = [[[NSMenuItem alloc] initWithTitle:@"Zoom" action:@selector(performZoom:) keyEquivalent:@""] autorelease];
    NSMenuItem *cycleMenuItem = [[[NSMenuItem alloc] initWithTitle:@"Cycle Through Windows" action:@selector(_cycleWindows:) keyEquivalent:@"`"] autorelease];
    [windowMenu addItem:minimizeMenuItem];
    [windowMenu addItem:zoomMenuItem];
    [windowMenu addItem:cycleMenuItem];
    NSMenuItem *windowMenuItem = [[NSMenuItem new] autorelease];
    [windowMenuItem setSubmenu:windowMenu];
 
    NSMutableArray *windowMenuItems = [NSMutableArray arrayWithCapacity:3];
    [windowMenuItems addObject:fileMenuItem];
    [windowMenuItems addObject:viewMenuItem];
    [windowMenuItems addObject:windowMenuItem];
    self.oldMenu = (NSMenu *)VuoApp_setMenuItems(windowMenuItems);
 
    [self updateFullScreenMenu];
 
    [self updateUI];
}
 
- (void)resignMainWindow
{
    [super resignMainWindow];
 
    // No need to change presentation when resigning, since:
    //    - other VuoGraphicsWindows change presentation on becomeMainWindow
    //    - Mac OS X changes presentation when another app becomes active
    //
    // Also, if two VuoGraphicsWindows are fullscreen on separate displays,
    // switching out of fullscreen presentation will cause the menubar and dock to flicker
    // when clicking from one display to another.
//  if (!_isInMacFullScreenMode)
//      [self setFullScreenPresentation:NO];
 
    VuoApp_setMenu(_oldMenu);
    self.oldMenu = nil;
}
 
- (void)keyDown:(NSEvent *)event
{
    if ([event keyCode] == kVK_Escape && [self isFullScreen])
        [super keyDown:event];
}
 
- (void)updateUI
{
    if (_recorder)
        _recordMenuItem.title = @"Stop Recording…";
    else
        _recordMenuItem.title = @"Start Recording";
}
 
- (void)enableUpdatedWindowTrigger:(VuoGraphicsWindowUpdatedWindowCallback)updatedWindow
{
    _updatedWindow = updatedWindow;
 
    VuoRenderedLayers rl = VuoRenderedLayers_makeEmpty();
    VuoRenderedLayers_setWindow(&rl, VuoWindowReference_make(self));
    _updatedWindow(rl);
 
    NSView *v = self.contentView;
    __block VuoGraphicsLayer *l;
    VuoApp_executeOnMainThread(^{
        l = (VuoGraphicsLayer *)v.layer;
    });
    [l enableTriggers];
}
 
- (void)enableShowedWindowTrigger:(VuoGraphicsWindowShowedWindowCallback)showedWindow requestedFrameTrigger:(VuoGraphicsWindowRequestedFrameCallback)requestedFrame
{
    _showedWindow = showedWindow;
    _showedWindow(VuoWindowReference_make(self));
 
    _requestedFrame = requestedFrame;
 
    NSView *v = self.contentView;
    __block VuoGraphicsLayer *l;
    VuoApp_executeOnMainThread(^{
        l = (VuoGraphicsLayer *)v.layer;
    });
    [l enableTriggers];
}
 
- (void)disableTriggers
{
    NSView *v = self.contentView;
    __block VuoGraphicsLayer *l;
    VuoApp_executeOnMainThread(^{
        l = (VuoGraphicsLayer *)v.layer;
    });
    [l disableTriggers];
 
    _updatedWindow = NULL;
    _showedWindow = NULL;
    _requestedFrame = NULL;
}
 
- (bool)isFullScreen
{
    __block NSUInteger styleMask;
    VuoApp_executeOnMainThread(^{
        styleMask = self.styleMask;
    });
    return _isInMacFullScreenMode || styleMask == 0;
}
 
 
- (void)setTitle:(NSString *)title
{
    self.titleBackup = title;
    super.title = title;
}
 
- (void)setProperties:(VuoList_VuoWindowProperty)properties
{
    unsigned int propertyCount = VuoListGetCount_VuoWindowProperty(properties);
    for (unsigned int i = 1; i <= propertyCount; ++i)
    {
        VuoWindowProperty property = VuoListGetValue_VuoWindowProperty(properties, i);
//      VLog("%s",VuoWindowProperty_getSummary(property));
 
        if (property.type == VuoWindowProperty_Title)
            self.title = property.title ? [NSString stringWithUTF8String:property.title] : @"";
        else if (property.type == VuoWindowProperty_FullScreen)
        {
            NSScreen *requestedScreen = VuoScreen_getNSScreen(property.screen);
 
            // If we're already fullscreen, and the property tells us to switch to a different screen,
            // temporarily switch back to windowed mode, so that we can cleanly switch to fullscreen on the new screen.
            if ([self isFullScreen] && property.fullScreen)
            {
                NSInteger requestedDeviceId = [[[requestedScreen deviceDescription] objectForKey:@"NSScreenNumber"] integerValue];
                NSInteger currentDeviceId = [[[self.screen deviceDescription] objectForKey:@"NSScreenNumber"] integerValue];
                if (requestedDeviceId != currentDeviceId)
                    [self setFullScreen:NO onScreen:nil];
            }
 
            if (requestedScreen)
                [self setFullScreen:property.fullScreen onScreen:requestedScreen];
        }
        else if (property.type == VuoWindowProperty_Position)
        {
            NSRect propertyInPoints = NSMakeRect(property.left, property.top, 0, 0);
            if (property.unit == VuoCoordinateUnit_Pixels)
                propertyInPoints = [self.contentView convertRectFromBacking:propertyInPoints];
 
            NSRect mainScreenRect = [[[NSScreen screens] objectAtIndex:0] frame];
            if ([self isFullScreen])
                _contentRectWhenWindowed.origin = NSMakePoint(propertyInPoints.origin.x, mainScreenRect.size.height - _contentRectWhenWindowed.size.height - propertyInPoints.origin.y);
            else
            {
                NSRect contentRect = [self contentRectForFrameRect:[self frame]];
                self.frameOrigin = NSMakePoint(propertyInPoints.origin.x, mainScreenRect.size.height - contentRect.size.height - propertyInPoints.origin.y);
            }
        }
        else if (property.type == VuoWindowProperty_Size)
        {
            NSRect propertyInPoints = NSMakeRect(0, 0, property.width, property.height);
            if (property.unit == VuoCoordinateUnit_Pixels)
                propertyInPoints = [self.contentView convertRectFromBacking:propertyInPoints];
            _maintainsPixelSizeWhenBackingChanges = (property.unit == VuoCoordinateUnit_Pixels);
 
            if ([self isFullScreen])
                _contentRectWhenWindowed.size = propertyInPoints.size;
            else
            {
                NSRect contentRect = [self contentRectForFrameRect:[self frame]];
 
                // Adjust the y position by the change in height, so that the window appears to be anchored in its top-left corner
                // (instead of its bottom-left corner as the system does by default).
                contentRect.origin.y += contentRect.size.height - propertyInPoints.size.height;
 
                contentRect.size = NSMakeSize(propertyInPoints.size.width, propertyInPoints.size.height);
                @try
                {
                    _constrainToScreen = NO;
                    [self setFrame:[self frameRectForContentRect:contentRect] display:YES animate:NO];
                    _constrainToScreen = YES;
                }
                @catch (NSException *e)
                {
                    char *description = VuoLog_copyCFDescription(e);
                    VUserLog("Error: Couldn't change window size to %lldx%lld: %s", property.width, property.height, description);
                    free(description);
                }
            }
        }
        else if (property.type == VuoWindowProperty_AspectRatio)
        {
            if (property.aspectRatio < 1./10000
             || property.aspectRatio > 10000)
            {
                VUserLog("Error: Couldn't change window aspect ratio to %g since it's unrealistically narrow.", property.aspectRatio);
                continue;
            }
 
            NSRect contentRect = [self contentRectForFrameRect:[self frame]];
            [self setAspectRatioToWidth:contentRect.size.width height:contentRect.size.width/property.aspectRatio];
        }
        else if (property.type == VuoWindowProperty_AspectRatioReset)
            [self unlockAspectRatio];
        else if (property.type == VuoWindowProperty_Resizable)
        {
            [[self standardWindowButton:NSWindowZoomButton] setEnabled:property.resizable];
            if ([self isFullScreen])
                _styleMaskWhenWindowed = property.resizable ? (_styleMaskWhenWindowed | NSResizableWindowMask) : (_styleMaskWhenWindowed & ~NSResizableWindowMask);
            else
                self.styleMask =         property.resizable ? ([self styleMask]       | NSResizableWindowMask) : ([self styleMask]       & ~NSResizableWindowMask);
        }
        else if (property.type == VuoWindowProperty_Cursor)
        {
            _cursor = property.cursor;
            [self invalidateCursorRectsForView:self.contentView];
        }
    }
}
 
- (NSRect)liveFrame
{
    Rect qdRect;
    extern OSStatus GetWindowBounds(WindowRef window, WindowRegionCode regionCode, Rect *globalBounds);
 
    GetWindowBounds([self windowRef], kWindowStructureRgn, &qdRect);
 
    return NSMakeRect(qdRect.left,
                      (float)CGDisplayPixelsHigh(kCGDirectMainDisplay) - qdRect.bottom,
                      qdRect.right - qdRect.left,
                      qdRect.bottom - qdRect.top);
}
 
- (void)setAspectRatioToWidth:(unsigned int)pixelsWide height:(unsigned int)pixelsHigh
{
    pixelsWide = MAX(VuoGraphicsWindowMinSize, pixelsWide);
    pixelsHigh = MAX(VuoGraphicsWindowMinSize, pixelsHigh);
 
    NSSize newAspect = NSMakeSize(pixelsWide, pixelsHigh);
    if (NSEqualSizes([self contentAspectRatio], newAspect))
        return;
 
    // Sets the constraint when the user resizes the window (but doesn't affect the window's current size).
    self.contentAspectRatio = newAspect;
 
    if ([self isFullScreen])
    {
        if (_updatedWindow)
        {
            VuoRenderedLayers rl = VuoRenderedLayers_makeEmpty();
            VuoRenderedLayers_setWindow(&rl, VuoWindowReference_make(self));
            _updatedWindow(rl);
        }
        if (_showedWindow)
            _showedWindow(VuoWindowReference_make(self));
        return;
    }
 
    CGFloat desiredWidth = pixelsWide;
    CGFloat desiredHeight = pixelsHigh;
    CGRect windowFrame = [self liveFrame];
    CGFloat aspectRatio = (CGFloat)pixelsWide / (CGFloat)pixelsHigh;
 
    // Adjust the width and height if the user manually resized the window.
    if (_userResizedWindow)
    {
        // Preserve the width, scale the height.
        desiredWidth = CGRectGetWidth(windowFrame);
        desiredHeight = CGRectGetWidth(windowFrame) / aspectRatio;
    }
 
    // Adjust the width and height if they don't fit the screen.
    NSRect screenFrame = [[self screen] visibleFrame];
    NSRect maxContentRect = [self contentRectForFrameRect:screenFrame];
    if (desiredWidth > maxContentRect.size.width || desiredHeight > maxContentRect.size.height)
    {
        CGFloat maxContentAspectRatio = maxContentRect.size.width / maxContentRect.size.height;
        if (aspectRatio >= maxContentAspectRatio)
        {
            // Too wide, so scale it to the maximum horizontal screen space.
            desiredWidth = maxContentRect.size.width;
            desiredHeight = maxContentRect.size.width / aspectRatio;
        }
        else
        {
            // Too tall, so scale it to the maximum vertical screen space.
            desiredWidth = maxContentRect.size.height * aspectRatio;
            desiredHeight = maxContentRect.size.height;
        }
    }
 
    NSSize newContentSize = NSMakeSize(desiredWidth, desiredHeight);
    NSSize newWindowSize = [self frameRectForContentRect:NSMakeRect(0, 0, newContentSize.width, newContentSize.height)].size;
 
    // Preserve the window's top left corner position. (If you just resize, it preserves the bottom left corner position.)
    CGFloat topY = CGRectGetMinY(windowFrame) + CGRectGetHeight(windowFrame);
    NSRect newWindowFrame = NSMakeRect(CGRectGetMinX(windowFrame), topY - newWindowSize.height, newWindowSize.width, newWindowSize.height);
 
    _programmaticallyResizingWindow = YES;
    [self setFrame:newWindowFrame display:YES];
    _programmaticallyResizingWindow = NO;
 
    if (_updatedWindow)
    {
        VuoRenderedLayers rl = VuoRenderedLayers_makeEmpty();
        VuoRenderedLayers_setWindow(&rl, VuoWindowReference_make(self));
        _updatedWindow(rl);
    }
    if (_showedWindow)
        _showedWindow(VuoWindowReference_make(self));
}
 
- (void)unlockAspectRatio
{
    self.resizeIncrements = NSMakeSize(1,1);
}
 
- (NSRect)constrainFrameRect:(NSRect)frameRect toScreen:(NSScreen *)screen
{
    if (_constrainToScreen)
        return [super constrainFrameRect:frameRect toScreen:screen];
    else
        return frameRect;
}
 
- (void)setFullScreenPresentation:(bool)enabled
{
    if (enabled)
    {
        // Don't raise the window level, since the window still covers the screen even when it's not focused.
//      self.level = NSScreenSaverWindowLevel;
 
        // Instead, just hide the dock and menu bar.
        ((NSApplication *)NSApp).presentationOptions = NSApplicationPresentationHideDock | NSApplicationPresentationHideMenuBar;
    }
    else
    {
//      self.level = NSNormalWindowLevel;
        ((NSApplication *)NSApp).presentationOptions = NSApplicationPresentationDefault;
    }
}
 
- (void)setFullScreen:(BOOL)wantsFullScreen onScreen:(NSScreen *)screen
{
    _programmaticallyResizingWindow = true;
 
    if (wantsFullScreen && ![self isFullScreen])
    {
        // Switch into fullscreen mode.
 
 
        // Save the position, size, and style, to be restored when switching back to windowed mode.
        _contentRectWhenWindowed = [self contentRectForFrameRect:self.frame];
        _styleMaskWhenWindowed = [self styleMask];
 
        // Move the window to the specified screen.
        // (Necessary even for Mac-fullscreen mode, since it fullscreens on whichever screen the window is currently on.)
        if (screen && ![[self screen] isEqualTo:screen])
        {
            NSRect windowFrame = self.frame;
            NSRect screenFrame = screen.frame;
            self.frameOrigin = NSMakePoint(screenFrame.origin.x + screenFrame.size.width/2  - windowFrame.size.width/2,
                                           screenFrame.origin.y + screenFrame.size.height/2 - windowFrame.size.height/2);
        }
 
 
        // Use Mac-fullscreen mode by default, since it's compatible with Mission Control,
        // and since (unlike Kiosk Mode) the menu bar stays hidden on the fullscreen display
        // when you focus a window on a different display (such as when livecoding during a performance).
        bool useMacFullScreenMode = true;
 
        // If `System Preferences > Mission Control > Displays have separate Spaces` is unchecked,
        // only a single window could go Mac-fullscreen at once, so don't use Mac-fullscreen mode in that case.
        if (!NSScreen.screensHaveSeparateSpaces)
            useMacFullScreenMode = false;
 
 
        if (useMacFullScreenMode)
        {
            _isInMacFullScreenMode = YES;
 
            // If a size-locked window enters Mac-fullscreen mode,
            // its height increases upon exiting Mac-fullscreen mode.
            // Mark it resizeable while fullscreen, to keep its size from changing (!).
            self.styleMask |= NSResizableWindowMask;
 
            dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
                dispatch_semaphore_wait(VuoGraphicsWindow_fullScreenTransitionSemaphore, DISPATCH_TIME_FOREVER);
                dispatch_async(dispatch_get_main_queue(), ^{
                    _programmaticallyTransitioningFullScreen = true;
                    [self toggleFullScreen:nil];
                    [self updateFullScreenMenu];
                });
            });
        }
        else
        {
            [self setFullScreenPresentation:YES];
 
            NSSize car = self.contentAspectRatio;
            self.styleMask = 0;
            if (!NSEqualSizes(car, NSMakeSize(0,0)))
                self.contentAspectRatio = car;
 
            // Make the window take up the whole screen.
            [self setFrame:self.screen.frame display:YES];
 
            [self finishFullScreenTransition];
            [self updateFullScreenMenu];
        }
    }
    else if (!wantsFullScreen && [self isFullScreen])
    {
        // Switch out of fullscreen mode.
 
        if (_isInMacFullScreenMode)
        {
            _isInMacFullScreenMode = NO;
 
            dispatch_async(dispatch_get_global_queue(DISPATCH_QUEUE_PRIORITY_DEFAULT, 0), ^{
                dispatch_semaphore_wait(VuoGraphicsWindow_fullScreenTransitionSemaphore, DISPATCH_TIME_FOREVER);
                dispatch_async(dispatch_get_main_queue(), ^{
                    _programmaticallyTransitioningFullScreen = true;
                    [self toggleFullScreen:nil];
                    self.styleMask = _styleMaskWhenWindowed;
                    [self updateFullScreenMenu];
                });
            });
        }
        else
        {
            [self setFullScreenPresentation:NO];
 
            NSSize car = self.contentAspectRatio;
            self.styleMask = _styleMaskWhenWindowed;
            self.title = _titleBackup;
            if (!NSEqualSizes(car, NSMakeSize(0,0)))
                self.contentAspectRatio = car;
 
            [self setFrame:[self frameRectForContentRect:_contentRectWhenWindowed] display:YES];
 
            [self finishFullScreenTransition];
            [self updateFullScreenMenu];
        }
    }
}
 
- (void)finishFullScreenTransition
{
    _programmaticallyResizingWindow = false;
 
    [self.delegate windowDidResize:nil];
 
    [self makeFirstResponder:self];
}
 
- (void)toggleFullScreen
{
    [self setFullScreen:![self isFullScreen] onScreen:nil];
}
 
- (void)toggleRecording
{
    if (!self.recorder)
    {
        // Start recording to a temporary file (rather than first asking for the filename, to make it quicker to start recording).
        self.temporaryMovieURL = [NSURL fileURLWithPath:[NSTemporaryDirectory() stringByAppendingPathComponent:[[NSProcessInfo processInfo] globallyUniqueString]]];
        _recorder = [[VuoWindowRecorder alloc] initWithWindow:self url:_temporaryMovieURL];
 
        [self updateUI];
    }
    else
        [self stopRecording];
}
 
- (void)promptToSaveMovie
{
    NSSavePanel *sp = [NSSavePanel savePanel];
    [sp setTitle:@"Save Movie"];
    [sp setNameFieldLabel:@"Save Movie To:"];
    [sp setPrompt:@"Save"];
    [sp setAllowedFileTypes:@[@"mov"]];
 
    char *title = VuoApp_getName();
    sp.nameFieldStringValue = [NSString stringWithUTF8String:title];
    free(title);
 
    if ([sp runModal] == NSFileHandlingPanelCancelButton)
        goto done;
 
    NSError *error;
    if (![[NSFileManager defaultManager] moveItemAtURL:_temporaryMovieURL toURL:[sp URL] error:&error])
    {
        if ([error code] == NSFileWriteFileExistsError)
        {
            // File exists.  Since, in the NSSavePanel, the user said to Replace, try replacing it.
            if (![[NSFileManager defaultManager] replaceItemAtURL:[sp URL]
                      withItemAtURL:_temporaryMovieURL
                     backupItemName:nil
                            options:0
                   resultingItemURL:nil
                              error:&error])
            {
                // Replacement failed; show error…
                NSAlert *alert = [NSAlert alertWithError:error];
                [alert runModal];
 
                // …and give the user another chance.
                [self promptToSaveMovie];
            }
            goto done;
        }
 
        NSAlert *alert = [NSAlert alertWithError:error];
        [alert runModal];
    }
 
done:
    self.temporaryMovieURL = nil;
}
 
- (void)stopRecording
{
    if (!_recorder)
        return;
 
    [_recorder finish];
    [_recorder release];
    _recorder = nil;
 
    [self updateUI];
 
    [self setFullScreen:NO onScreen:nil];
 
    [self promptToSaveMovie];
}
 
- (void)cancelOperation:(id)sender
{
    [self setFullScreen:NO onScreen:nil];
}
 
- (void)close
{
    NSView *v = self.contentView;
    VuoGraphicsLayer *gv = (VuoGraphicsLayer *)v.layer;
    [gv close];
 
    [super close];
}
 
- (void)dealloc
{
    // https://b33p.net/kosada/node/12123
    // Cocoa leaks the contentView unless we force it to resign firstResponder status.
    [self makeFirstResponder:nil];
 
    [super dealloc];
}
 
@end