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Getting messages from the IntelliMouse

, 15 Dec 1999
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How to set up message handlers for a wheel mouse
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The IntelliMouse (the mouse with the wheel in the center) is pretty neat. You can register to get the wheel messages from it in your top level frame. If you want to handle the message in a view you must pass the message down manually as is illustrated. To get messages from the wheel add the following to your application:

  1. To make the wheel act like a simple middle button just add handlers for:

    WM_MBUTTONDOWN
    WM_MBUTTONUP
    

    and so-on just like left and right buttons. You won't find this in the class wizzard but you can add them manually.

  2.  
  3. For wheel messages do the following:

    Declare a global in your app as follows:

    UINT uMSH_MOUSEWHEEL;
    

    and everyplace else declare an external so you can get at it

    extern UINT uMSH_MOUSEWHEEL;
    
  4.  
  5. In your initialization code register the following message

    uMSH_MOUSEWHEEL = RegisterWindowMessage("MSWHEEL_ROLLMSG");
    
  6.  
  7. (In the MAIN FRAME add the following:

    To the message map in the .H file add

    afx_msg LONG OnWheel(UINT a, LONG b);
    

    To the message map in the .CPP file add

    ON_REGISTERED_MESSAGE(uMSH_MOUSEWHEEL,OnWheel) 
    

    And then add the message handler as follows

    LONG CMainFrame::OnMouseWheel(UINT nFlags, LONG pValue) 
    {
    	if(nFlags & 0x0100) // Rolled in
    	{
    		// do rolled in stuff here
    	}
    	else // Rolled out
    	{
    		// do rolled out stuff here
    	}
    	return 0;
    }
    
  8.  
  9. if you want to receive this message in a view then add the same handlers shown above to your view and then do the following in your main frame.

    LONG CMainFrame::OnWheel(UINT a, LONG b)
    {
    	BOOL yn;
    	MDIChildWnd* aw = (MDIChildWnd*)MDIGetActive(&yn); 
    	if(aw)
    	{
    		CView * junk;
    		junk = aw->GetActiveView();
    		if(junk)
    			junk->SendMessage(uMSH_MOUSEWHEEL,a,b);
    	}
    	return> 0;
    }
    

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About the Author

Randy More

United States United States
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Comments and Discussions

 
Generalback/forward buttons Pinmemberpakosan28-Apr-04 18:37 
GeneralRe: back/forward buttons PinmemberNerdBoy13-Sep-04 10:00 
GeneralRe: back/forward buttons PinmemberFranc Morales13-Sep-04 17:54 
GeneralWM_MOUSEWHEEL PinmemberAnonymous2-Jul-01 13:50 

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