Thread: Ghost painting

  1. #1
    mustang benny bennyandthejets's Avatar
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    Ghost painting

    I've intercepted the WM_PAINT message for my edit control, and I am drawing my own text in. After drawing, I validate and return 0. However, when I click on the control, it erases everything I've done. Using Spy++ I can see that there are no paint or erase background messages being sent. How is it possible then for drawing to occur that I do not know about?

    Code:
    	case WM_PAINT:
    		{
    			HDC hdc=GetDC(hwnd);
    			TextOut(hdc,0,0,"text",4);
    			ReleaseDC(hwnd,hdc);
    			ValidateRect(hwnd,NULL);
    		}
    		return 0;
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  2. #2
    Yes, my avatar is stolen anonytmouse's Avatar
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    I gather you are subclassing the text control. One of the other messages must be causing an internal repaint.

    EM_SETRECT seems to be one such. Have a look here:
    http://msdn.microsoft.com/library/en...ormatting_rect

    Also EM_SETFOCUS seems to be a likely candidate.

    Which features are you hoping to use from the original edit control? If you want the text handling ability (EM_SETSEL, EM_PASTE, etc) you will need to query the edit control for the text to paint. If you don't want these features you may be better off creating a new control.

  3. #3
    mustang benny bennyandthejets's Avatar
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    Yeah, you're right. I would have thought that WM_PAINT would be the only drawing message, but plenty of others draw as well. If I really need to, I'll eventually create my own control. For now, I'll start a new thread to try find another solution to what I want to do.
    [email protected]
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