OpenEuphoria

Re: Win32Lib:repaint screen on move 2nd window

• Posted by David Cuny <dcuny at LANSET.COM> Sep 04, 2000
• 460 views

Jason Mirwald wrote:

> I searched the copy of Win32Lib that I have, and it
> does not call ValidateRect anywhere that I could find.
> If onPaint is meant as a routine that is run when a
> window recieves the WM_PAINT message, then
> ValidateRect MUST be called before the routine
> returns control to "windows", or "windows" will
> erase the area again.

My impression was that this happened automatically when BeginPaint was
called. From the Win32 API help file, under ValidateRect:

"The BeginPaint function automatically validates the entire client area.
Neither the ValidateRect nor ValidateRgn function should be called if a
portion of the update region must be validated before the next WM_PAINT
message is generated."

Of course, I could be entirely misunderstading this.

-- David Cuny