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I made a little cocoa app that brings up an IKPictureTaker and saves a picture to a file if you press the set button. Currently, if you press esc or Command . the window picture taker will close. Is there a way to disable this behavior?

Mike2012
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3 Answers3

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You need to insert yourself somewhere in the responder chain in time to catch the escape key down event, and disable it. You may have to subclass IKPictureTaker. The snippet below should help you (source).

- (void)keyDown:(NSEvent *)event {
   if ([event keyCode] == 53) {
        NSLog(@"Escape has been pressed");
   }
}
Johan Kool
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Another approach is to hide the close and Cancel buttons, so they can't be pressed:

IKPictureTaker *taker = [IKPictureTaker pictureTaker];
[taker setStyleMask:0]; //disable close button
for(NSView *aView in [[taker contentView] subviews]){
 if([aView isKindOfClass:[NSButton class]]){
  NSButton *aButton = (NSButton*)aView;
  if([aButton action] ==  @selector(cancelButton:))
   [aButton setHidden:YES];
 }
}
Vincent Gable
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  • The close button is disabled in my app, what I am asking about is how to prevent it from being close when someone pressed the esc key or command . – Mike2012 Dec 08 '09 at 18:28
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    It's the cancel or close buttons that are acting on the esc/cmd-. So disabling them gives you the behavior you want. But if you want the button visible, but without that key equivalent, then instead of doing [aButton setHidden:YES] do, [aButton setKeyEquivalent:@""] – Vincent Gable Dec 08 '09 at 20:26
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    This doesn't work any more on 10.9 Mavericks. If I'm missing something, please let me know. Thanks. – Chuck H May 01 '14 at 01:51
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If you want/need to drop down to the low level, see the CGEvent API. Using it, you'd create a tap and swallow/modify specific events.

justin
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