Distinguishing a single click from a double click in Cocoa on the Mac

Question

I have a custom NSView (it\'s one of many and they all live inside an NSCollectionView — I don\'t think that\'s relevant, but who knows). When I click

Answer 1

Add two properties to your custom view.

// CustomView.h
@interface CustomView : NSView {
  @protected
    id      m_target;
    SEL     m_doubleAction;
}
@property (readwrite) id target;
@property (readwrite) SEL doubleAction;

@end

Overwrite the mouseUp: method in your custom view.

// CustomView.m
#pragma mark - MouseEvents

- (void)mouseUp:(NSEvent*)event {
    if (event.clickCount == 2) {
        if (m_target && m_doubleAction && [m_target respondsToSelector:m_doubleAction]) {
            [m_target performSelector:m_doubleAction];
        }
    }
}

Register your controller as the target with an doubleAction.

// CustomController.m
- (id)init {
    self = [super init];
    if (self) {
        // Register self for double click events.
        [(CustomView*)m_myView setTarget:self];
        [(CustomView*)m_myView setDoubleAction:@selector(doubleClicked:)];
    }
    return self;
}

Implement what should be done when a double click happens.

// CustomController.m
- (void)doubleClicked:(id)sender {
  // DO SOMETHING.
}