PRB: Toolbar Buttons Not Updated/Painted Correctly in Windows 95 (168289)

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.

   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;

   }