Resolved UI holding up OpenGL view

Do this:

• subclass NSButton
• Override -mouseDown:, -mouseDragged: and -mouseUp:
• Do not call super in any of those overrides, except perhaps to do highlighting/unhighlighting (even the, self would be fine)
• In -mouseDown:, handle the click, then leave (do not wait for mouse-up, handle the tracking asynchronously through the other methods)

This should hand control over to the main runloop more often so that your UI can update as required.

 

It sounds like NSButton (or NSButtonCell) is shifting the NSRunLoop into a different mode while it tracks the mouse.

I'm assuming you're using either scheduledTimerWithTimeInterval:target:selector:userInfo:repeats: or scheduledTimerWithTimeInterval:invocation:repeats: to create your timer. These methods will only add the timer to the default run-loop mode.

Instead try using timerWithTimeInterval:target:selector:userInfo:repeats: or timerWithTimeInterval:invocation:repeats:, and then manually adding the timer to the run loop for the common mode.

Code:

[[NSRunLoop mainRunLoop] 
    addTimer:timer 
     forMode:NSRunLoopCommonModes];