Question

I have a custom NSWindow subclass that the user can toggle the display of with the click of a button. I’d also like the window to disappear when the window resigns key status (e.g. by the user clicking outside the window).

I have a delegate that implements windowDidResignKey: but I find that this delegate method is only invoked the first time the window resigns key.

Here’s how I toggle the display of the window (via user action or windowDidResignKey):

- (void) toggleWindowAtPoint:(NSPoint)point
{
    // Attach/detach window.
    if (!attachedWindow) 
    {
        attachedWindow = [[CustomWindow alloc] attachedToPoint:point];
        attachedWindow.delegate = self;
        [attachedWindow setLevel:NSMainMenuWindowLevel+1];  // show window in front of all other apps on desktop
        [attachedWindow makeKeyAndOrderFront:self];
    } 
    else 
    {
        attachedWindow.delegate = nil;
        [attachedWindow orderOut:self];
        [attachedWindow release];
        attachedWindow = nil;
    }    
}

Here’s my implementation of windowDidResignKey:

- (void) windowDidResignKey:(NSNotification *)note
{
    [self toggleWindowAtPoint:NSMakePoint(0, 0)];
}

I’m finding that the first time the custom window is displayed, windowDidResignKey: gets called. Every time the custom window is re-displayed after that, windowDidResignKey: is not getting invoked.

Answer 1

The issue was that in some cases, the custom window was not actually becoming the key window after calling [attachedWindow makeKeyAndOrderFront:self].

I fixed this by adding the following line before re-creating the window:

[[NSApplication sharedApplication] activateIgnoringOtherApps:YES];

In the context of the code snippet above:

- (void) toggleWindowAtPoint:(NSPoint)point
{
   // Attach/detach window.
   if (!attachedWindow) 
   {
      [[NSApplication sharedApplication] activateIgnoringOtherApps:YES];
      attachedWindow = [[CustomWindow alloc] attachedToPoint:point];
      ....