On Jul 4, 2011, at 11:31 AM, Dr. Scott Steinman wrote:

> I have concluded that there are two options to do this:
> 
> 1. Draw each display into two NSViews, then switch back and forth between 
> between them (via replaceSubview:with:) with an NSTimer to time the switches.
> 2. Use Core Animation to fade in one display and fade in the other.

I would just use a single view that has a boolean state, like _drawBlackText, 
and use a repeating NSTimer to trigger a method that flips the variable and 
tells the view to redraw.

> In each case, I don't know how to avoid blocking a button presses whose 
> action would stop the animation.

Normally a timer will only run in NSDefaultRunloopMode, i.e. while the app is 
idle. But while a control is tracking mouse events, it runs a nested runloop in 
NSEventTrackingRunloopMode. If you want the timer to fire during the 
mouse-down, you’ll need to make it run in that mode as well; see the NSRunLoop 
API for details.

—Jens_______________________________________________

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