MFC ribbon home button closes app with double click

Question

I've faced with strange behaviour of a home ribbon button.
I've created standard MFC application in Visual Studio 2010 with Office template that has a ribbon control. But if I double click on the Home ribbon button at the upper position the application is closed.
Could you please tell me if it is standard MFC application handlers behaviour and how I can change it?
I've looked at Prevent double click on MFC-Dialog button but couldn't apply it to my case (more clearly - I don't know how to add double click handler to a ribbon home button).

Ovidiu Cucu Ovidiu Cucu · Accepted Answer · 2017-08-08T09:24:33

CMFCRibbonApplicationButton is not derived from CWnd so cannot handle WM_LBUTTONDBLCLK message. One solution is to derive from CMFCRibbonBar.

class CCustomRibbonBar : public CMFCRibbonBar
{
    // ...
protected:
    DECLARE_MESSAGE_MAP()
    afx_msg void OnLButtonDblClk(UINT nFlags, CPoint point);
};


BEGIN_MESSAGE_MAP(CCustomRibbonBar, CMFCRibbonBar)
    ON_WM_LBUTTONDBLCLK()
END_MESSAGE_MAP()

void CCustomRibbonBar::OnLButtonDblClk(UINT nFlags, CPoint point)
{
    CMFCRibbonBaseElement* pHit = HitTest(point);
    if (pHit->IsKindOf(RUNTIME_CLASS(CMFCRibbonApplicationButton)))
    {
        // the user double-clicked in the application button
        // do what you want here but do not call CMFCRibbonBar::OnLButtonDblClk
        return;
    }
    CMFCRibbonBar::OnLButtonDblClk(nFlags, point);
}

Another solution: override PreTranslateMessage in CMainFrame class;

BOOL CMainFrame::PreTranslateMessage(MSG* pMsg)
{
    if ((WM_LBUTTONDBLCLK == pMsg->message) && (pMsg->hwnd == m_wndRibbonBar))
    {
        CPoint point(pMsg->pt);
        m_wndRibbonBar.ScreenToClient(&point);
        CMFCRibbonBaseElement* pHit = m_wndRibbonBar.HitTest(point);
        if (pHit && pHit->IsKindOf(RUNTIME_CLASS(CMFCRibbonApplicationButton)))
        {
            // do what you want but do not call CMDIFrameWndEx::PreTranslateMessage
            return TRUE; // no further dispatch
        }
    }
    return CMDIFrameWndEx::PreTranslateMessage(pMsg);
}

MFC ribbon home button closes app with double click

2 Answers