DOCUMENT:Q251232 03-MAY-2001 [visualc] TITLE :BUG: MFC Dockable Toolbars Do Not Paint Correctly PRODUCT :Microsoft C Compiler PROD/VER:winnt:5.0,6.0 OPER/SYS: KEYWORDS:kbCmnCtrls kbMFC kbToolbar KbUIDesign kbVC500bug kbVC600bug kbDSupport kbGrpDSMFCATL kb ====================================================================== ------------------------------------------------------------------------------- The information in this article applies to: - The Microsoft Foundation Classes (MFC), included with: - Microsoft Visual C++, 32-bit Enterprise Edition, version 5.0 - Microsoft Visual C++, 32-bit Professional Edition, version 5.0 - Microsoft Visual C++, 32-bit Enterprise Edition, version 6.0 - Microsoft Visual C++, 32-bit Professional Edition, version 6.0 - Microsoft Visual C++, 32-bit Learning Edition, version 6.0 ------------------------------------------------------------------------------- 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 this to be a bug in the Microsoft products 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 ========== - CToolBar::CreateEx - CBRS_TOP - CBRS_ALIGN_TOP - Q141675 How to Save and Restore State of Dockable Toolbars - Q232845 LoadBarState asserts while restoring two/more floating toolbars Additional query words: CToolBarCtrl CControlBar painting poor incorrect docking ====================================================================== Keywords : kbCmnCtrls kbMFC kbToolbar KbUIDesign kbVC500bug kbVC600bug kbDSupport kbGrpDSMFCATL kbMFCCtrlBar Technology : kbAudDeveloper kbMFC Version : winnt:5.0,6.0 Issue type : kbbug Solution Type : kbpending ============================================================================= THE INFORMATION PROVIDED IN THE MICROSOFT KNOWLEDGE BASE IS PROVIDED "AS IS" WITHOUT WARRANTY OF ANY KIND. MICROSOFT DISCLAIMS ALL WARRANTIES, EITHER EXPRESS OR IMPLIED, INCLUDING THE WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE. IN NO EVENT SHALL MICROSOFT CORPORATION OR ITS SUPPLIERS BE LIABLE FOR ANY DAMAGES WHATSOEVER INCLUDING DIRECT, INDIRECT, INCIDENTAL, CONSEQUENTIAL, LOSS OF BUSINESS PROFITS OR SPECIAL DAMAGES, EVEN IF MICROSOFT CORPORATION OR ITS SUPPLIERS HAVE BEEN ADVISED OF THE POSSIBILITY OF SUCH DAMAGES. SOME STATES DO NOT ALLOW THE EXCLUSION OR LIMITATION OF LIABILITY FOR CONSEQUENTIAL OR INCIDENTAL DAMAGES SO THE FOREGOING LIMITATION MAY NOT APPLY. Copyright Microsoft Corporation 2001.