Why are some strings displayed as garbage when I scroll my read-only multiline Win32 edit control ve
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Published on 2010-04-25T11:36:32Z
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2010/04/25
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In my native C+ Win32 GUI application I have a property sheet with two property pages. One of the property pages contains an edit box:
EDITTEXT IDC_EDIT_ID,x,y,width,height,ES_MULTILINE | ES_READONLY | NOT WS_BORDER | WS_VSCROLL | WS_HSCROLL | NOT WS_TABSTOP,WS_EX_STATICEDGE
I set a multiline text to this edit box. The text has more lines than the edit can fit, so some of the text is clipped and a vertical scroll bar appears.
When I scroll up with the mouse the lines that come "from under clip area" are drawn as garbage - it looks like first one line is drawn, then some other line is drawn on the same place without first painting the background. The lines that just move up - ones that were visible before scrolling and remain visible after scrolling are displayed allright.
What's the reason and workaround for this behavior?
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