Event for mouse leaving a NSWindow instance

Question

Is there a mechanism for detecting when the mouse leaves the active NSWindow bounds?

I've already tried overriding the mouseMoved: method, but that is not called when the mouse is outside the NSWindow bounds.

Answer 1

The best is to use NSTrackingArea

- (void)configureTrackingArea
{
    NSRect trackingRect = self.window.contentView.frame
    NSTrackingAreaOptions trackingOptions = NSTrackingMouseEnteredAndExited | NSTrackingActiveInKeyWindow;
    NSTrackingArea *trackingArea = [[NSTrackingArea alloc] initWithRect:trackingRect options:trackingOptions owner:self userInfo:nil];

    NSView *contentView = [[self window] contentView];
    [contentView addTrackingArea:trackingArea];
}


- (void)mouseEntered:(NSEvent *)event
{
    [[self window] addChildWindow:[self previewWindow] ordered:NSWindowAbove];
}

- (void)mouseExited:(NSEvent *)event
{
    [self hidePreviewWindow];
}