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How to suppress form repaints during calculations Turn on/off line numbers in source code. Switch to Orginial background IDE or DSP color Comment or reply to this aritlce/tip for discussion. Bookmark this article to my favorite article(s). Print this article
23-Aug-02
Category
VCL-Forms
Language
Delphi 2.x
Views
47
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Publisher:
DSP, Administrator
Reference URL:
DKB
			Author: Tomas Rutkauskas

Is there a way to stop an application from painting during heavy calculations?

Answer:

Call LockWindowUpdate() on your MainForm. Your form will not be redrawn and cannot 
be moved until you unlock it by passing 0 as the window handle.

Note that LockWindowUpdate() does not hide the form nor does it reset the 
WS_VISIBLE style bit.

1      
2   LockWindowUpdate(MainForm.Handle); // pass the handle of window to lock
3   
4   // heavy calculation here
5   
6   LockWindowUpdate(0); // unlock it


			
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