MFC ActiveX not properly redrawn

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Hey Folks,

I'm facing an annoying problem that drives me nuts.

On my CView-derived view I placed an ActiveX Control that consists of some buttons - nothing fancy or special. At the beginning it is shown correctly but after the OnUpdate()-method of the view the Control is not shown anymore - it's just a white plane. When I now resize the view the control is painted again correctly. Also when I click somewhere on the white plane the control's button underneath my cursor is then shown again - the others remain white.

I tried already to Invalidate() the control with no success.

Any hints or tips?

Posted 17-Feb-14 21:55pm

DFaeuster

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Albert Holguin 25-Feb-14 13:16pm

What kind of control is it?

DFaeuster 26-Feb-14 1:29am

It's a self written ActiveX Control similar to a toolbar (some buttons etc.)
But I've found a solution for my redrawing problem in the meanwhile by calling "RedrawWindow()"

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bling · Answer 1 · 2014-02-18T05:34:00

This *usually* means the containing window is processing the WM_ERASEBKGND windows message. If the Active-X control draws it's own background - having the containing window do this is a waste and also causes flicker. Override this message to return a non-zero value (eg. 1) to suppress this behavior.

http://msdn.microsoft.com/en-us/library/windows/desktop/ms648055%28v=vs.85%29.aspx[^]

Another thing to check is the containing window's style. The containing window should have the WS_CLIPCHILDREN style set so that it doesn't draw / erase its child windows.

http://msdn.microsoft.com/en-us/library/windows/desktop/ms632600%28v=vs.85%29.aspx[^]