BUG: Edit Controls and WS_CLIPCHILDREN Function Differently

Last reviewed: January 5, 1995
Article ID: Q111652

The information in this article applies to:

Microsoft Windows Software Development Kit (SDK) for Windows version 3.1

SYMPTOMS

Unnecessary painting is done when an edit control window is created with the WS_CLIPCHILDREN style bit set.

CAUSE

If an edit control window is created with the WS_CLIPCHILDREN style bit set, a WM_PAINT message will be sent to the parent. In Windows version 3.0, the rcUpdate is (0,0,0,0), which makes it very easy to ignore this WM_PAINT message. In Windows version 3.1, the rcUpdate is the size of the child edit control, which causes extra painting to be done. The WM_PAINT message is not necessary because the child control itself does the painting, not the parent.

STATUS

Microsoft has confirmed this to be a bug in Windows version 3.1. We are researching this problem and will post new information here in the Microsoft Knowledge Base as it becomes available.

Additional reference words: buglist3.10 3.10
KBCategory: kbprg kbbuglist
KBSubcategory: UsrCtl

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Last reviewed: January 5, 1995
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