How to repaint static control on changing text?

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I handle WM_CTLCOLORSTATIC message to make transparent background for static control:

C++

case WM_CTLCOLORSTATIC:
{
SetTextColor((HDC)wParam,RGB(0,0,0));
SetBkMode((HDC)wParam,TRANSPARENT);
HBRUSH return_brush = (HBRUSH)GetStockObject(NULL_BRUSH);
return (LRESULT)return_brush;
}

This works fine.
And now I try to change text for static control by calling SendMessage(). But in result new text is placed over the existing text. I think that need to repaint static control.
How to repaint static control and what WM messages need to handle?

Posted 20-Jun-13 23:20pm

Igor-84

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Bilashcse · Answer 1 · 2013-06-21T19:14:00

Solution 4

Try with this : How to repaint static control on changing text?[^]

Posted 21-Jun-13 19:14pm

Bilashcse

KarstenK · Answer 2 · 2013-06-20T23:27:00

Solution 1

At first you need to draw the background. -> WMERASE_BKGROUND

http://msdn.microsoft.com/en-us/library/windows/desktop/ms648055(v=vs.85).aspx[^]

Posted 20-Jun-13 23:27pm

KarstenK

Comments

Igor-84 21-Jun-13 5:50am

KarstenK, please write the source code, because I don't know how to do it.

KarstenK 21-Jun-13 5:59am

Please learn it by yourself. It includes handling the message an a FillRect call.

If it is too hard for you to figure it out, you should consider doing work which fits better to you. ;-)

JackDingler · Answer 3 · 2013-06-21T06:17:00

Solution 2

Try calling Invalidate() on the window.

Posted 21-Jun-13 6:17am

JackDingler

Philippe Mori · Answer 4 · 2013-06-21T12:07:00

Windows controls are not intended to have a transparent background.

Either set the background color to the color of the underlayiong control or paint the underlaying control before displaying text.

The problem is that since the background brush is transparent, then it does not erase old text as it would be the case with a regular fully opaque brush.