DetectIfShiftKeyIsBeingPressed

I have one of those nifty smooth effects in my app and was wondering If I can detect if the shift key is being held so I can slow it down.

NSView is a subclass of NSResponder. You want to look at the flagsChanged method, or you can do something like this.

NSEvent *currentEvent = someView window] currentEvent];
unsigned flags = [currentEvent modifierFlags];
if (flags & [[NSShiftKeyMask) NSLog(@"shift key has been  presseed");

[RTM]

Actually, its a bit easier. The NSWindow instance just gets if from your NSApplications instance. This should work:

[NSApp currentEvent];

NSEvent *currentEvent = [NSApp currentEvent];  // NSApp is a global pointing to your application instance
unsigned flags = [currentEvent modifierFlags];
if (flags & NSShiftKeyMask) NSLog(@"shift key has been  presseed");

I believe in being very careful with bitmask operations. I’d write it like this:

NSEvent *currentEvent = [NSApp currentEvent];
if ([currentEvent modifierFlags] & NSShiftKeyMask == NSShiftKeyMask) {
    NSLog(@"shift key has been pressed");
}

if you do it that way, don’t forget a = ;)

CocoaDev