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Microsoft KB Archive/251232

From BetaArchive Wiki

Article ID: 251232

Article Last Modified on 11/21/2006



APPLIES TO

  • Microsoft Foundation Class Library 4.2, when used with:
    • Microsoft Visual C++ 5.0 Enterprise Edition
    • Microsoft Visual C++ 5.0 Professional Edition
    • Microsoft Visual C++ 6.0 Enterprise Edition
    • Microsoft Visual C++ 6.0 Professional Edition
    • Microsoft Visual C++ 6.0 Standard Edition



This article was previously published under Q251232

SYMPTOMS

When you create a toolbar using the MFC CToolBar class and if you used the CBRS_ALIGN_TOP style, then the toolbar may not paint properly. You see dark spots on the right most and left most edges of the toolbar. This repainting problem is more obvious if you undock the toolbar and dock it again.

RESOLUTION

Use the CBRS_TOP style instead of CBRS_ALIGN_TOP. CBRS_TOP is defined as the following:

#define CBRS_TOP            (CBRS_ALIGN_TOP|CBRS_BORDER_BOTTOM)
                


Thus, if you use CBRS_TOP or use CBRS_ALIGN_TOP along with CBRS_BORDER_BOTTOM, it works correctly and as expected.

STATUS

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

MORE INFORMATION

Note that the CreateEx member function of CToolBar, takes the CBRS_ALIGN_TOP style as the default. Therefore, if you had code like the following then you see this behavior.

    if (!m_wndToolBar.CreateEx(this) ||
        !m_wndToolBar.LoadToolBar(IDR_MAINFRAME))
    {
        TRACE0("Failed to create toolbar\n");
        return -1;      // fail to create
    }
                


In an AppWizard generated application, you do not see this behavior because it uses the CBRS_TOP style.

Steps to Reproduce Behavior

  1. Generate a new MFC SDI or MDI application.
  2. Go to Mainfrm.cpp, CMainFrame::OnCreate and replace the CToolBar::CreateEx call to look like the following:

        if (!m_wndToolBar.CreateEx(this, TBSTYLE_FLAT, WS_CHILD | WS_VISIBLE | CBRS_ALIGN_TOP
            | CBRS_GRIPPER | CBRS_TOOLTIPS | CBRS_FLYBY | CBRS_SIZE_DYNAMIC) ||
            !m_wndToolBar.LoadToolBar(IDR_MAINFRAME))
        {
            TRACE0("Failed to create toolbar\n");
            return -1;      // fail to create
        }
    
                            

    Replace CBRS_TOP with CBRS_ALIGN_TOP.

  3. Build and run the application. Drag the toolbar out, move it around and dock it back. Observe that it does not paint properly.


REFERENCES



Additional query words: CToolBarCtrl CControlBar painting poor incorrect docking

Keywords: kbbug kbcmnctrls kbmfcctrlbar kbpending kbtoolbar kbuidesign KB251232