On Jun 7, 2010, at 3:31 AM, Ken Thomases wrote:

> Why do you need such a notification?  Windows don't "spontaneously" become 
> visible unbeknownst to your code.

I’ve run into this in an app that has a singleton panel, which I want to 
persistently remember whether it’s open or closed. In other words, I want to 
update a boolean user-default when the window opens or closes. But the panel is 
in the main nib, with the “Show Panel" menu command simply wired up to its 
-makeKeyAndOrderFront: method. So the window was indeed becoming spontaneously 
visible without my code being called.

I found it was possible to detect closing via a notification, but not opening. 
I ended up writing a custom -showMyPanel: method, wiring the menu to that, and 
having that method set the default. Not a big deal, but it would have been 
cleaner if there’d just been a window-did-become-visible notification to listen 
to.

—Jens_______________________________________________

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