I'm in the midst of debugging an extremely unusual problem, and I was wondering if anybody might have any insight into what might be going wrong:
In a controller class from a NIB, I take an NSPanel from that same NIB, and then show it app modally on an NSWindow (that was created by hand in code):
[[NSApplication sharedApplication] beginSheet: myPanel
modalForWindow: window
modalDelegate: self
didEndSelector: @selector(sheetDidEnd:returnCode:contextInfo:)
contextInfo: nil];
[[NSApplication sharedApplication] runModalForWindow: myPanel];
Now, when the "finish" button on that sheet is clicked, I run some code to disable some buttons and fire off a thread to make sure the user input is valid (i have to validate with a remote service). This thread is fired from a separate validator object I create:
// controller calls:
[validator validateCreds: creds
notify: @selector(validationComplete:)
onObject: self];
// validator object
validateInfo: (NSDictionary *)parms
notify: (SEL)notifySelector
onObject: (id)notifyObject
{
// build up data with parms and notify info
[[NSThread detachNewThreadSelector: @selector(remotevalidate:)
toTarget: self withObject: data];
}
Next, when the validation is finished, the validator notifies my controller object:
[notifyObject performSelectorOnMainThread: notifySelector
withObject: results waitUntilDone: NO];
and then my controller object, in the method that the validator object calls, kills the dialog:
- (void)validationComplete: (id)data
{
[[NSApplication sharedApplication] stopModal];
[createTwitterPanel orderOut: nil];
[[NSApplication sharedApplication] endSheet: createTwitterPanel
returnCode: NSOKButton];
}
- (void)sheetDidEnd:(NSWindow *)sheet
returnCode:(int)returnCode
contextInfo:(void *)contextInfo
{
m_returnCode = returnCode;
}
My problem: Although the panel is closed / disappears, the top NSApp runModalForWindow:
does not exit until some system event is sent to the window that was showing the dialog. Trying to move, resize, or do anything to the window, or otherwise switching away from the application suddenly causes the method to exit and execution to continue. no amount of waiting seems to help, otherwise, however.
I have verified that all methods being invoked on the controller class are all being invoked on the main app thread.
An even more interesting clue is that the dialog has two controls, a WebView and an NSTextField: Even if I force the exit of runModalForWindow:
by clicking on the window, TABbing between the two controls remains screwed up — it simply never works again. It's like my event loop is horked.
I've tried changing validationComplete: to instead post a notification to the main thread, and I've also played with the waitUntilDone
on the performSelectorOnMainThread
method, all to no effect.
Any ideas? Things I should try looking at?