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

Delaying the changing of the selection state is (from what I've seen) the recommended way of doing this.

It's pretty simple to implement:

- (void)mouseUp:(NSEvent *)theEvent
{
    if([theEvent clickCount] == 1) {
        [model performSelector:@selector(toggleSelectedState) afterDelay:[NSEvent doubleClickInterval]];
    }
    else if([theEvent clickCount] == 2)
    {
        if([model hasBeenDownloaded])
        {
                [NSRunLoop cancelPreviousPerformRequestsWithTarget: model]; 
                [mainWindowController showPreviewWindowForPicture:model];
        }
    }
}

(Notice that in 10.6, the double click interval is accessible as a class method on NSEvent)