Thanks, Peter. That made it really clear.
Actually keeping clip rectangles must be an enormous headache for PalmOS, since you can switch to offscreen, etc. Still you probably need something like stacking order, otherwise you can't do it properly. An obvious advantage of clipping rectangles is that each screen area isn't drawn more than once, therefore you don't need a back buffer: this is really worthwhile ! Michael -----Original Message----- From: Peter Epstein [mailto:[EMAIL PROTECTED]] Sent: Thursday, 6 December 2001 1:14 PM To: Palm Developer Forum Subject: RE: Form must be full width? The clipping rectangle is set for each frmUpdateEvent to just the portion of that form which was obscured by the closing form. That's how the information is passed, not as an explicit parameter. Most applications don't do anything special with the clipping rectangle, but any drawing they do will be clipped to that rectangle by the operating system. Since the update logic assumes the constraints are satisfied, it will miss some of the exposed areas. -- Peter Epstein -- For information on using the Palm Developer Forums, or to unsubscribe, please see http://www.palmos.com/dev/tech/support/forums/ -- For information on using the Palm Developer Forums, or to unsubscribe, please see http://www.palmos.com/dev/tech/support/forums/
