Detect fullscreen menu bar movement

Question

So right now I have an NSWindow that draws itself like an NSToolbar using INAppStoreWindow, and I was wondering if there was any kind of event or message sent out when the menu bar moves while the app is in full screen, so that I could then move the title bar of the window in response (the way a standard NSToolbar works). Clearly NSToolbar knows something that I don't, and it would save me from making an NSTrackingArea on the upper part of my window.

Here's what it does now:

And here's what I'd like to do:

Unfortunately, KVO'ing a fullScreenAccessoryView does not work as well. Frame events are only generated when entering and exiting fullscreen mode, and not when the toolbar is "moved down" by the status bar.

Answer 1

How about this? Create NSStatusBarItem with a custom NSView having width 0 and then track its window's position using NSWindowWillMoveNotification.

UPDATE: I made a fork of the INAppStoreWindow with a custom toolbar attached to the menubar. Check it out.

Answer 2

One thing you could try is to use set a fake (i.e. empty) toolbar on the window and then give it a fullScreenAccessoryView. This view is, when moving into fullscreen, removed from the view hierarchy and attached below the toolbar. Dunno, however, how this is works when using a custom window class... :/

Answer 3

I was looking to accomplish exactly the same thing. I was able to do it by setting the superview of the titlebar view in a WAYAppStoreWindow (or INAppStoreWindow) to post frame change notifications and then observing frame change notifications on this view. Add the following observer in your setup:

[[NSNotificationCenter defaultCenter] addObserver:self
                                         selector:@selector(windowTitleBarFrameDidChange:)
                                             name:NSViewFrameDidChangeNotification
                                           object:window.titleBarView.superview];

And turn on/off frame change notifications when entered/exiting full-screen:

window.titleBarView.superview.postsFrameChangedNotifications = YES;

Then in the implementation of the windowTitleBarFrameWillChange: method, check to see when the titlebar will show by comparing with the last y position of it’s superview’s frame. Here is the code:

// Window titlebar heights.
#define kWindowTitlebarHeightDefault    22.0
#define kWindowTitlebarHeightStandard   37.0
#define kWindowTitlebarHeightExtended   82.0

- (void) windowTitleBarFrameDidChange:(NSNotification *)notification;
{
    NSView * titleBarView = [notification object];  // view is actually the titlebar container view

    if (NSMinX(_lastTitleBarFrame) == NSMinX(titleBarView.frame) &&
        NSWidth(_lastTitleBarFrame) == NSWidth(titleBarView.frame) &&
        NSHeight(_lastTitleBarFrame) == NSHeight(titleBarView.frame) &&
        NSMinY(_lastTitleBarFrame) == -kWindowTitlebarHeightDefault &&
        NSMinY(titleBarView.frame) > -kWindowTitlebarHeightDefault)                     // titlebar will show
    {
        [self windowTitleBarWillShow];
    }
    else if (NSMinX(_lastTitleBarFrame) == NSMinX(titleBarView.frame) &&
             NSWidth(_lastTitleBarFrame) == NSWidth(titleBarView.frame) &&
             NSHeight(_lastTitleBarFrame) == NSHeight(titleBarView.frame) &&
             NSMinY(_lastTitleBarFrame) == 0.0 && NSMinY(titleBarView.frame) < 0.0)     // titlebar will hide
    {
        [self windowTitleBarWillHide:YES];
    }
    else if (NSWidth(_lastTitleBarFrame) != NSWidth([NSScreen mainScreen].frame) &&
             NSWidth(titleBarView.frame) == NSWidth([NSScreen mainScreen].frame))       // just went full-screen
    {
        [self windowTitleBarWillHide:NO];
    }

    _lastTitleBarFrame = titleBarView.frame;
}

- (void) windowTitleBarWillHide:(BOOL)animate
{
    WAYAppStoreWindow * window = (WAYAppStoreWindow *)[(NSWindowController *)[[self windowControllers] objectAtIndex:0] window];
    NSView * themeFrame = window.titleBarView.superview.superview;    
    if (animate)
        [themeFrame animator].alphaValue = 0.0;
    else
        themeFrame.alphaValue = 0.0;
}

- (void) windowTitleBarWillShow
{
    WAYAppStoreWindow * window = (WAYAppStoreWindow *)[(NSWindowController *)[[self windowControllers] objectAtIndex:0] window];
    NSView * themeFrame = window.titleBarView.superview.superview;
    [themeFrame animator].alphaValue = 1.0;
}

- (void) windowWillEnterFullScreen:(NSNotification *)notification
{
    WAYAppStoreWindow * window = [notification object];
    [self setUpFullScreenTitleBarForWindow:window];
    _lastTitleBarFrame = NSZeroRect;
}

- (void) windowDidEnterFullScreen:(NSNotification *)notification;
{
    WAYAppStoreWindow * window = [notification object];
    window.titleBarView.superview.postsFrameChangedNotifications = YES;
    _fullscreenToolbarView.hidden = NO;
}

- (void) windowWillExitFullScreen:(NSNotification *)notification;
{
    WAYAppStoreWindow * window = [notification object];
    window.titleBarView.superview.postsFrameChangedNotifications = NO;
    [self setUpStandardTitleBarForWindow:window];
}

- (void) setUpNormalTitleBarForWindow:(WAYAppStoreWindow *)window
{
    window.appearance = nil;
    window.showsTitle = NO;
    window.titleBarHeight = kWindowTitlebarHeightExtended;
    window.verticalTrafficLightButtons = YES;
    window.centerTrafficLightButtons = YES;
    window.trafficLightButtonsLeftMargin = 13.0;

    _fullscreenToolbarView.hidden = YES;
}

- (void) setUpFullScreenTitleBarForWindow:(WAYAppStoreWindow *)window
{
    window.appearance = [NSAppearance appearanceNamed:NSAppearanceNameVibrantDark];
    window.showsTitle = YES;
    window.titleBarHeight = kWindowTitlebarHeightStandard;
    window.verticalTrafficLightButtons = NO;
    window.centerTrafficLightButtons = YES;
    window.trafficLightButtonsLeftMargin = 13.0;
    window.verticallyCenterTitle = YES;

    _fullscreenToolbarView.hidden = YES;
    _lastTitleBarFrame = NSZeroRect;
}

NB: I’m using a fork of WAYWindow that adds support for vertically centring the document title in the titlebar.