I'm attempting to add, remove, and re-add an instance of
NSTrackingArea to a custom view. Adding works fine; removing works
fine; but when I attempt to add it to the view again, the tracking
area is not added.
Here's the code:
- (void)applicationDidFinishLaunching:(NSNotification *)aNotification
{
// myTrackingArea is declared as an instance variable of type
NSTrackingArea *
myTrackingArea = [[NSTrackingArea alloc]
initWithRect:self.blueView.frame
options:(NSTrackingMouseEnteredAndExited |
NSTrackingActiveInActiveApp) owner:self userInfo:nil];
}
-(IBAction)addTrackingArea:(id)sender
{
[self.blueView addTrackingArea:myTrackingArea];
NSLog(@"%@", myTrackingArea);
}
-(IBAction)removeTrackingArea:(id)sender
{
[self.blueView removeTrackingArea:myTrackingArea];
}
-(void)dealloc
{
[myTrackingArea release];
[super dealloc];
}
The app launches and I click the button to target the addTrackingArea:
action. It logs the following:
NSTrackingArea 0x100526f80: rect={{20, 21}, {248, 320}},
owner=0x10012b730 userData=(null)
NSTrackingMouseEnteredAndExited
NSTrackingActiveInActiveApp
pendingInstall notInstalled disabled
The delegate now receives mouseEntered: and mouseExited: messages.
Now I click the button to target the removeTrackingArea: action. The
delegate stops receiving mouseEntered: and mouseExited:, as expected.
Now I click the addTrackingArea: button. It logs the following:
NSTrackingArea 0x100526f80: rect={{20, 21}, {248, 320}},
owner=0x10012b730 userData=(null)
NSTrackingMouseEnteredAndExited
NSTrackingActiveInActiveApp
REMOVED pendingInstall notInstalled disabled
(Note that curious 'REMOVED' in there.) The delegate still fails to
receive mouseEntered: and mouseExited: messages.
Can anyone explain why the tracking area can be added and removed but
not re-added? Thanks in advance for any help.
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