Microsoft KB Archive/220021

= FIX: CHtmlView Does Not Repaint Correctly in an AppWizard-Generated MDI Application =

Article ID: 220021

Article Last Modified on 2/23/2007

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APPLIES TO

 Microsoft Visual C++ 6.0 Enterprise Edition, when used with:  Microsoft Windows NT 4.0

 Microsoft Windows 95

 Microsoft Windows 98 Standard Edition  Microsoft Visual C++ 6.0 Professional Edition, when used with:  Microsoft Windows NT 4.0</li></ul>

 Microsoft Windows 95</li></ul>

 Microsoft Windows 98 Standard Edition</li></ul> </li> Microsoft Visual C++ 6.0 Standard Edition, when used with:  Microsoft Windows NT 4.0</li></ul>

 Microsoft Windows 95</li></ul>

 Microsoft Windows 98 Standard Edition</li></ul> </li> Microsoft Foundation Class Library 4.2</li> Microsoft Windows 2000 Professional Edition</li> Microsoft Windows 2000 Server</li> <li>Microsoft Windows 2000 Advanced Server</li></ul>

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This article was previously published under Q220021

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SYMPTOMS
In an AppWizard-generated MDI application with more than two view windows overlapping each other, if the user clicks in the client area of the MDI frame window other than the view, such that the view loses the focus, and then clicks back in the client area of the view, the CHtmlView does not repaint correctly. However, if the user clicks the nonclient area of the view, the CHtmlView repaints correctly.

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CAUSE
The WS_CLIPCHILDREN style is not set for CHtmlView, and therefore, on activating the view by clicking the view area, CHtmlView does not send a message to the embedded Web Browser control to repaint itself.

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RESOLUTION
To work around this problem, in PreCreateWindow of CHtmlView, add the WS_CLIPCHILDREN style. Following is a code example:

BOOL CSampleView::PreCreateWindow(CREATESTRUCT& cs) {   // TODO: Modify the Window class or styles here by modifying // the CREATESTRUCT cs    cs.style |= WS_CLIPCHILDREN;

return CHtmlView::PreCreateWindow(cs); }

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STATUS
Microsoft has confirmed that this is a bug in the Microsoft products that are listed at the beginning of this article.

This problem was corrected in Microsoft Visual C++ .NET.

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Steps to Reproduce Behavior

 * 1) Create an MDI application using the AppWizard.
 * 2) In step 6/6 of AppWizard, choose View class as CHtmlView.
 * 3) Build and run it.
 * 4) On the File menu, click New, and launch a new ChildFrame so that you have more than two frames, one overlapping the other.
 * 5) Click in the client area of the MDI frame window other than the CHtmlView, such that the view in consideration loses focus.
 * 6) Try to set focus by clicking in the client area of CHtmlView in consideration.

RESULTS: Notice that the view has not completely repainted. Portions of the view window, overlapped by the other view window, are not painted.

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