How to get notified when NSWindow opens?

Question

How to take notice when an NSWindow is about to be opened or have just opened? That is, the opposite of windowWillClose: delegate method (likewise the opposite of NSWindowWillCloseNotification.)

This is related to this question, but from the other direction.

The background is, I'm looking to couple a window with a tickmark on the main menu (among other things). When the window is shown, the corresponding ̨ menu item should be checked and vice-versa.

Answer 1

It should not normally be a mystery when or how a window is made visible. It should only happen in response to something that your own code is doing. If the window is in a NIB and is marked Visible At Launch, then it shows when your code loads that NIB. Otherwise, it should only show if you call one of the -order... methods other than -orderOut: (e.g. -orderFront:) or -makeKeyAndOrderFront:. If the window is controlled by a window controller, then it would show if you invoke -[NSWindowController showWindow:]. Etc.

If you really feel the need to be notified, you can subclass NSWindow and override -orderWindow:relativeTo: and, if orderingMode is not NSWindowOut and the window was not already visible, post a notification of your own.