Q168289: PRB: Toolbar Buttons Not Updated/Painted Correctly in Windows 95

Article: Q168289
Product(s): Microsoft C Compiler
Version(s): winnt:4.0,4.1,4.2,4.2b,5.0
Operating System(s): 
Keyword(s): kbMFC kbToolbar KbUIDesign kbVC400 kbVC410 kbVC420 kbVC500 kbGrpDSMFCATL kbNoUpdate
Last Modified: 17-JUL-2001

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The information in this article applies to:

- The Microsoft Foundation Classes (MFC), used with:
   - Microsoft Visual C++, 32-bit Editions, versions 4.0, 4.1, 4.2b 
   - Microsoft Visual C++, 32-bit Enterprise Edition, version 4.2 
   - Microsoft Visual C++, 32-bit Professional Edition, version 4.2 
   - Microsoft Visual C++, 32-bit Enterprise Edition, version 5.0 
   - Microsoft Visual C++, 32-bit Professional Edition, version 5.0 
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SYMPTOMS
========

Buttons on a toolbar that were created using CToolBar may not update or paint
correctly if the buttons have text associated with them. This happens only on
Windows 95 machines with Internet Explorer 3.x installed.

CAUSE
=====

This is due to a bug in the ComCtl32.dll (version 4.70) that is installed with
Internet Explorer 3.x.

RESOLUTION
==========

To work around this problem, derive a class from CToolBar and override
DefWindowProc as follows:

     // MyToolBar.h : headerfile
     class CMyToolBar : public CToolBar
     {
     ...
     protected:
        virtual LRESULT DefWindowProc(UINT message, WPARAM wParam,
           LPARAM lParam);
     ...
     };

     // MyToolBar.cpp : implementation file
     #include "stdafx.h"
     #include "mytoolbar.h"
     ...
     LRESULT CMyToolBar::DefWindowProc(UINT message, WPARAM wParam,
        LPARAM lParam)
     {
        // the toolbar common control does not handle these messages well
        // if the WS_VISIBLE style is not turned on under Windows 95
        DWORD style = GetStyle();
        if (message == TB_DELETEBUTTON || message == TB_INSERTBUTTON)
        {
           if (!(style & WS_VISIBLE))
           {
              ModifyStyle(0,WS_VISIBLE);
           }
        }
        LRESULT lresult = CToolBar::DefWindowProc(message, wParam, lParam);
        if (message == TB_DELETEBUTTON || message ==TB_INSERTBUTTON)
        {
           if (!(style & WS_VISIBLE))
           {
              ModifyStyle(WS_VISIBLE,0);
           }
        }
        return lresult;
     }

You can derive the CToolBar by using ClassWizard to derive from "generic CWnd"
and changing all CWnd references to CToolBar.

STATUS
======

Because Microsoft Visual C++, version 6.0 requires Internet Explorer 4.01,
Service Pack 1, this problem no longer exists in Visual C++, version 6.0.

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

Steps to Reproduce Behavior
---------------------------

Add the following code to CMainFrame::OnCreate in a Default Appwizard
Application:

     BOOL CMainFrame::OnCreate(...)
     {
        ...
        m_wndToolBar.SetButtonText(0,"New");
        m_wndToolBar.SetButtonText(1,"Open");
        m_wndToolBar.SetButtonText(2,"Save");
        m_wndToolBar.SetButtonText(4,"Cut");
        m_wndToolBar.SetButtonText(5,"Copy");
        m_wndToolBar.SetButtonText(6,"Paste");
        m_wndToolBar.SetButtonText(8,"Print");
        m_wndToolBar.SetButtonText(9,"About");

        CRect temp;
        m_wndToolBar.GetItemRect(0,&temp);
        m_wndToolBar.SetSizes( CSize(temp.Width(),temp.Height()),
           CSize(16,15));

        return 0;

     }

(c) Microsoft Corporation 1997, All Rights Reserved. Contributions by Sridhar S.
Madhugiri, Microsoft Corporation


Additional query words:

======================================================================
Keywords          : kbMFC kbToolbar KbUIDesign kbVC400 kbVC410 kbVC420 kbVC500 kbGrpDSMFCATL kbNoUpdate 
Technology        : kbAudDeveloper kbMFC
Version           : winnt:4.0,4.1,4.2,4.2b,5.0
Issue type        : kbprb

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