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MFC Example: WM_KICKIDLE and CCmdUI and ON_UPDATE_COMMAND_UI and WM_IDLEUPDATECMDUI

 
 

Implementation details to perform with a CDialog instance

 

  1. Include the MFC header file declaring private Windows messages and macros in the source file (.cpp) of your dialog class implementation.

     

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    #include <afxpriv.h>
  2. In the corresponding header file where your dialog window class is defined declare the prototypes of the WM_KICKIDLE message handler and the update UI handler as well. The WM_KICKIDLE message is always sent by the system if your dialog instance is idle. This is a good time to do some framework job.

     

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    //{{AFX_MSG(CCmdUIDemoDlg)
    virtual BOOL OnInitDialog();
    afx_msg void OnPaint();
    [...]
    //}}AFX_MSG
    afx_msg void OnKickIdle();
    afx_msg void OnUpdateUserButton(CCmdUI* pCmdUI);
    DECLARE_MESSAGE_MAP()
    
  3. Update your message map in .cpp file to map the WM_KICKIDLE message and the update notification message for the desired resource (the push button in our sample).

     

    Collapse Copy Code
    BEGIN_MESSAGE_MAP(CCmdUIDemoDlg, CDialog)
    	//{{AFX_MSG_MAP(CCmdUIDemoDlg)
    	ON_WM_PAINT()
    	[...]
    	//}}AFX_MSG_MAP
    	ON_MESSAGE_VOID(WM_KICKIDLE, OnKickIdle)
    	ON_UPDATE_COMMAND_UI(IDC_BUTTON1, OnUpdateUserButton)
    END_MESSAGE_MAP()
    
  4. At last implement the bodies of both message handlers

     

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    void CCmdUIDemoDlg::OnKickIdle()
    {
    	UpdateDialogControls(this, FALSE);
    }
    
    void CCmdUIDemoDlg::OnUpdateUserButton(CCmdUI *pCmdUI)
    {
    	pCmdUI->Enable(m_bToggle);
    }
    
  5. Done! By the pCmdUI pointer you've now access to the methods of the CCmdUI instance associated with the object, e.g. the value of the Enable() method's parameter (BOOL) decides if the control is enabled or disabled as known from a menuitem or tool bar button.

Implementation details to perform with a CFormView instance (not part of the demo code)

To use the update notification mechanism for a CFormView instance instead of a CDialog instance perform the following steps by analogy:

 

  1. Include the MFC header file declaring private Windows messages and macros in the source file (.cpp) of your dialog class implementation.

     

    Collapse Copy Code
    #include <afxpriv.h>
    
  2. In the corresponding header file where your view class is defined declare the prototypes of the WM_IDLEUPDATECMDUI message handler and the update UI handler as well. The WM_IDLEUPDATECMDUI message is always sent by the system if your view instance is idle.

     

    Collapse Copy Code
    //{{AFX_MSG(CMyFormView)
    [...]
    //}}AFX_MSG
    afx_msg void OnIdleUpdateCmdUI();
    afx_msg void OnUpdateUserControl(CCmdUI* pCmdUI);
    DECLARE_MESSAGE_MAP()
    
  3. Update your message map in .cpp file to map the WM_IDLEUPDATECMDUI message and the update notification message for the desired resource.

     

    Collapse Copy Code
    BEGIN_MESSAGE_MAP(CMyFormView, CFormView)
    	//{{AFX_MSG_MAP(CMyFormView)
    	[...]
    	//}}AFX_MSG_MAP
    	ON_MESSAGE_VOID(WM_IDLEUPDATECMDUI, OnIdleUpdateCmdUI)
    	ON_UPDATE_COMMAND_UI(IDC_MY_CONTROL, OnUpdateUserControl)
    END_MESSAGE_MAP()
    
  4. At last implement the bodies of both message handlers

     

    Collapse Copy Code
    void CMyFormView::OnIdleUpdateCmdUI()
    {
    	UpdateDialogControls(this, FALSE);
    }
    
    void CMyFormView::OnUpdateUserControl(CCmdUI *pCmdUI)
    {
    	pCmdUI->Enable(...);
    }
    
  5. Done!

 

 

 

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