mouseEntered and mouseExited not called in NSImageView SubClass

Question

I created a subclass of NSImageView to capture mouseEntered and mouseExited events. But only mouseUp and mouseDown events are getting called. How to capture the mouseEntered and mouseExited events in NSImageView subclass?

Answer 1

If You want to use mouseEntered: and mouseExited: You need to use NSTrackingArea. Here is reference NSTrackingArea Class Reference.

Example:

//Add this to Your imageView subclass  -(void)mouseEntered:(NSEvent *)theEvent {     NSLog(@"Mouse entered"); }  -(void)mouseExited:(NSEvent *)theEvent {     NSLog(@"Mouse exited"); }  -(void)updateTrackingAreas {      [super updateTrackingAreas];     if(trackingArea != nil) {         [self removeTrackingArea:trackingArea];         [trackingArea release];     }      int opts = (NSTrackingMouseEnteredAndExited | NSTrackingActiveAlways);     trackingArea = [ [NSTrackingArea alloc] initWithRect:[self bounds]                                                  options:opts                                                    owner:self                                                 userInfo:nil];     [self addTrackingArea:trackingArea]; }