This is an known and unfortunate result of the current architecture of
NSWindow, NSWindowController, and NSDocument.
There isn't any documentation I'm aware of that explicitly states that -close
can be invoked re-entrantly, but it can be deduced from the existing
documentation:
On -[NSDocument close]:
"The default implementation of this method … sends each of the
document's window controllers a -close message"
On -[NSWindowController close]:
"If the controller belongs to a document and it is either the last
controller for the document or -shouldCloseDocument is YES, then this will also
-close the document."
The best way around this at the moment is to first verify [self isClosed] == NO
before calling super and doing your own work.
[kevin perry];
On Sep 19, 2012, at 1:06 PM, Markus Spoettl <ms_li...@shiftoption.com> wrote:
> Why does AppKit call into NSDocument's -close multiple times by indirect
> recursion? Can this be on purpose?
>
> It happens when I have this:
>
> 1) A document with unsaved with changes
> 2) Terminate the app via CMD-Q
> 3) Answer "Don't Save" in the save-changes-sheet
>
> This doesn't smell right. I override -close and call super right away, doing
> some cleanup work afterwards. Under some bizarre situations which I have not
> been able to recreate it gets called up to 4 times.
>
> I'm pasting the call stack (line 366 is the call to super, line 375 is my
> breakpoint).
>
> Regards
> Markus
>
> #0 0x00000001000034d8 in -[MyDocument close] at
> /Users/markus/Projects/MyApp/src/MyDocument.m:375
> #1 0x00007fff8bed7d25 in -[NSWindowController _windowDidClose] ()
> #2 0x00007fff8a30ddf0 in -[QLSeamlessDocumentCloser
> closeWindow:contentFrame:withBlock:] ()
> #3 0x00007fff8baa8602 in -[NSWindow _close] ()
> #4 0x00007fff8bbe1c74 in -[NSDocument close] ()
> #5 0x00000001000033c9 in -[MyDocument close] at
> /Users/markus/Projects/MyApp/src/MyDocument.m:366
> #6 0x00007fff8bbf342e in __-[NSDocumentController
> closeAllDocumentsWithDelegate:didCloseAllSelector:contextInfo:]_block_invoke_3
> ()
> #7 0x00007fff8bbf54c5 in -[NSDocumentController
> _something:didSomething:soContinue:] ()
> #8 0x00007fff8bbd62a8 in __-[NSDocument
> canCloseDocumentWithDelegate:shouldCloseSelector:contextInfo:]_block_invoke_2
> ()
> #9 0x00007fff8bbd5ec1 in __-[NSDocument
> canCloseDocumentWithDelegate:shouldCloseSelector:contextInfo:]_block_invoke_11
> ()
> #10 0x00007fff8bbe8e08 in -[NSDocument
> _something:wasPresentedWithResult:soContinue:] ()
> #11 0x00007fff8bad8a4d in -[NSAlert didEndAlert:returnCode:contextInfo:] ()
> #12 0x00007fff8bae53df in -[NSApplication endSheet:returnCode:] ()
> #13 0x00007fff8bad8913 in -[NSAlert buttonPressed:] ()
> #14 0x00007fff8053770d in -[NSObject performSelector:withObject:] ()
> #15 0x00007fff8b934f7e in -[NSApplication sendAction:to:from:] ()
> #16 0x00007fff8b934eb2 in -[NSControl sendAction:to:] ()
> #17 0x00007fff8b934ddd in -[NSCell _sendActionFrom:] ()
> #18 0x00007fff8b9342a0 in -[NSCell trackMouse:inRect:ofView:untilMouseUp:]
> ()
> #19 0x00007fff8b9b3fc4 in -[NSButtonCell
> trackMouse:inRect:ofView:untilMouseUp:] ()
> #20 0x00007fff8b932eaa in -[NSControl mouseDown:] ()
> #21 0x00007fff8b8fe348 in -[NSWindow sendEvent:] ()
> #22 0x00007fff8b897a55 in -[NSApplication sendEvent:] ()
> #23 0x00007fff8bae427e in -[NSApplication _shouldTerminate] ()
> #24 0x00007fff8b838115 in -[NSApplication terminate:] ()
> #25 0x000000010001a4a3 in -[AppDelegate terminate:] at
> /Users/markus/Projects/rubiTrack/src/AppDelegate.m:219
> #26 0x00007fff8053770d in -[NSObject performSelector:withObject:] ()
> #27 0x00007fff8b934f7e in -[NSApplication sendAction:to:from:] ()
> #28 0x00007fff8ba21bfb in -[NSMenuItem _corePerformAction] ()
> #29 0x00007fff8ba21932 in -[NSCarbonMenuImpl
> performActionWithHighlightingForItemAtIndex:] ()
> #30 0x00007fff8b99f524 in -[NSMenu performKeyEquivalent:] ()
> #31 0x00007fff8b99e175 in -[NSApplication _handleKeyEquivalent:] ()
> #32 0x00007fff8b897536 in -[NSApplication sendEvent:] ()
> #33 0x00007fff8b82e0c6 in -[NSApplication run] ()
> #34 0x00007fff8baaa244 in NSApplicationMain ()
> #35 0x000000010000b552 in main at /Users/markus/Projects/MyApp/src/main.m:22
> #36 0x00000001000021c4 in start ()
>
> --
> __________________________________________
> Markus Spoettl
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