FIX: SetMinHeight Does Not Work Correctly with CStatusBar (151031)

MORE INFORMATION

The sample code below illustrates how to work around the problem. Use the CMyStatusBar class instead of CStatusBar if you want to change the height of the status bar using SetMinHeight function. Be sure to call RecalcLayout on the parent of the status bar to see this change in height immediately.

NOTE: The workaround uses the undocumented m_nMinHeight member variable of CStatusBar. Hence the code in the workaround may not be compatible with future versions of MFC.

Sample Code

   // MyStatusBar.h : header file
   // 

   //////////////////////////////////////////////////////////////////// 
   // CMyStatusBar window

   #ifndef __MYSTATUSBAR_H__
   #define __MYSTATUSBAR_H__

   class CMyStatusBar : public CStatusBar
   {
   // Construction
   public:
        CMyStatusBar() {}

   // Implementation
   public:
        virtual ~CMyStatusBar() {}

        // Generated message map functions
   protected:
        //{{AFX_MSG(CMyStatusBar)
        //NOTE-the ClassWizard will add and remove member functions here.
        //}}AFX_MSG

   #if _MFC_VER == 0x0400 || _MFC_VER == 0x0410 || _MFC_VER == 0x420 ||\ 
   _MFC_VER == 0x421

         afx_msg LRESULT OnSetMinHeight(WPARAM wParam, LPARAM);
   #endif

        DECLARE_MESSAGE_MAP()
   };

   #endif //__MYSTATUSBAR_H__

   //////////////////////////////////////////////////////////////////// 

   // MyStatusBar.cpp : implementation file
   // 

   #include "stdafx.h"
   #include "MyStatusBar.h"

   #ifdef _DEBUG
   #define new DEBUG_NEW
   #undef THIS_FILE
   static char THIS_FILE[] = __FILE__;
   #endif

   //////////////////////////////////////////////////////////////////// 
   // CMyStatusBar

   BEGIN_MESSAGE_MAP(CMyStatusBar, CStatusBar)
        //{{AFX_MSG_MAP(CMyStatusBar)
        //NOTE-the ClassWizard will add and remove mapping macros here.
        //}}AFX_MSG_MAP

   #if _MFC_VER == 0x0400 || _MFC_VER == 0x0410 || _MFC_VER == 0x420 ||\ 
   _MFC_VER == 0x421

        ON_MESSAGE(SB_SETMINHEIGHT, OnSetMinHeight)
   #endif

   END_MESSAGE_MAP()

   ///////////////////////////////////////////////////////////////////// 
   // CMyStatusBar message handlers

   #if _MFC_VER == 0x0400 || _MFC_VER == 0x0410 || _MFC_VER == 0x420 ||\ 
   _MFC_VER == 0x421

   LRESULT CMyStatusBar::OnSetMinHeight(WPARAM wParam, LPARAM)
   {
        LRESULT lResult = Default();
        m_nMinHeight = wParam;
        return lResult;
   }
   #endif