FIX: Undocking Toolbar May Disappear When Removed from Dockbar (134283)
The information in this article applies to:
- The Microsoft Foundation Classes (MFC), when used with:
- Microsoft Visual C++, 32-bit Professional Edition 2.0
This article was previously published under Q134283 SYMPTOMS
Attempting to undock or tear off a toolbar window from its dockbar window
occasionally causes the toolbar to disappear when the mouse button is
released.
CAUSE
This is caused by a bug in the MFC source code for CFrameWnd::CanDock().
Essentially, what happens is that the toolbar is being docked to an
invisible dockbar. The CFrameWnd::CanDock() function doesn't check to see
if the new docbar window is visible.
When you float a toolbar, and then close it by double-clicking the tiny
control menu or icon, the window is not destroyed; it is just hidden. If
you happen to drag and release another toolbar over the hidden toolbar, the
toolbar being dragged is docked to the hidden toolbar.
RESOLUTION
To work around this problem, rebuild the project with Visual C++ version
2.1. If that is not an option for you, you can work around the problem by
modifying the WINFRM2.CPP MFC source file and rebuilding the appropriate
MFC library.
NOTE: Microsoft recommends against rebuilding the MFC30(D).DLL (the MFC
Shared DLL). MFC30(D).DLL is a common component of many MFC applications.
Rebuilding MFC30(D).DLL runs the risk of breaking other applications that
rely on this component. If you do rebuild MFC30(D).DLL, please rename the
DLL.
Steps to fix WINFRM2.CPP Directly- Replace following line of code in CFrameWnd::CanDock():
if (pDockBar->IsDockBar() &&
(pDockBar->m_dwStyle & dwDockStyle & CBRS_ALIGN_ANY) &&
(!pDockBar->m_bFloating ||
(dwDockStyle & pDockBar->m_dwStyle & CBRS_FLOAT_MULTI)))
with this code:
if (pDockBar->IsDockBar() && pDockBar->IsWindowVisible() &&
(pDockBar->m_dwStyle & dwDockStyle & CBRS_ALIGN_ANY) &&
(!pDockBar->m_bFloating ||
(dwDockStyle & pDockBar->m_dwStyle & CBRS_FLOAT_MULTI)))
- Rebuild the MFC library according to the instructions in the
..\MSVC\MFC\SRC\README.TXT file.
STATUS
Microsoft has confirmed this to be a bug in the Microsoft products
listed at the beginning of this article. This problem was corrected in
Visual C++, 32-bit Edition, version 2.1.
| Modification Type: | Major | Last Reviewed: | 10/24/2003 |
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| Keywords: | kbBug kbfix kbNoUpdate kbToolbar KbUIDesign kbVC210fix KB134283 |
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