Q152376: HOWTO: How To Disable Push Buttons on a DialogBar in MFC

Article: Q152376
Product(s): Microsoft C Compiler
Version(s): winnt:1.0,2.0,2.1,2.2,4.0,4.1
Operating System(s): 
Keyword(s): kbDocView kbMFC KbUIDesign kbVC kbGrpDSMFCATL kbMFCCtrlBar
Last Modified: 06-MAY-2001

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The information in this article applies to:

- The Microsoft Foundation Classes (MFC), used with:
   - Microsoft Visual C++ for Windows, 16-bit edition, versions 1.0, 1.5, 1.51, 1.52, 1.52b, 1.52c 
   - Microsoft Visual C++, 32-bit Editions, versions 1.0, 2.0, 2.1, 2.2, 4.0, 4.1 
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SUMMARY
=======

Push-button controls on a DialogBar cannot be disabled by calling EnableWindow.
The following code has no effect:

     GetDlgItem(IDC_BUTTON1)->EnableWindow(FALSE);

This article describes how to implement push-button controls that can be
disabled.

MORE INFORMATION
================

Controls on a DialogBar behave like the bitmaps on a Toolbar. They can be
enabled or disabled by manually adding an ON_UPDATE_COMMAND_UI within the
message map of the appropriate class (such as CMainFrame).

Step-by-Step Example
--------------------

After you have placed a control on your DialogBar, such as a push-button with a
resource ID of IDC_BUTTON1, use the following steps to manage the state of the
control:

1. Within the declaration of your class, add the declaration for a handler
  function:

     afx_msg void OnUpdateButton1(CCmdUI* pCmdUI);

2. Within the implementation of your class, add a manual entry in the message
  map:

     BEGIN_MESSAGE_MAP(CMainFrame, CMDIFrameWnd)
         //{{AFX_MSG_MAP(CMainFrame)
         ...
         //}}AFX_MSG_MAP
         ON_UPDATE_COMMAND_UI(IDC_BUTTON1, OnUpdateButton1)
     END_MESSAGE_MAP()

3. Provide the definition of the handler function, as follows:

     void CMainFrame::OnUpdateButton1(CCmdUI* pCmdUI)
     {
         pCmdUI->Enable( TRUE );
     }

Additional query words: 1.00 1.50 1.51 1.52 2.00 2.10 2.20 4.00 4.10

======================================================================
Keywords          : kbDocView kbMFC KbUIDesign kbVC kbGrpDSMFCATL kbMFCCtrlBar 
Technology        : kbAudDeveloper kbMFC
Version           : winnt:1.0,2.0,2.1,2.2,4.0,4.1
Issue type        : kbhowto

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