MFC使用TRACKMOUSEEVENT触发mouseHover和mouseLeave

Posted 2022-11-11 2018shawn

 

为对话框添加WM_MOUSEHOVER或WM_MOUSELEAVE消息并不会响应。 MFC需要特殊处理，其中一法就是使用TRACKMOUSEEVENT

void CmfcDlgDlg::OnMouseMove(UINT nFlags, CPoint point)

    // TODO: 在此添加消息处理程序代码和/或调用默认值
    //GetDlgItem(IDC_BUTTON)->SetWindowText("Move");

    if (!m_bTracking)
    
        TRACKMOUSEEVENT tme;
        tme.cbSize = sizeof(TRACKMOUSEEVENT);
        tme.dwFlags = TME_LEAVE | TME_HOVER;//要触发的消息
        tme.hwndTrack = this->m_hWnd;
        tme.dwHoverTime = 10;// 若不设此参数，则无法触发mouseHover

        if (::_TrackMouseEvent(&tme)) //MOUSELEAVE|MOUSEHOVER消息由此函数触发
        
            m_bTracking = true;   
        
    

    CDialogEx::OnMouseMove(nFlags, point);



void CmfcDlgDlg::OnMouseHover(UINT nFlags, CPoint point)

    // TODO: 在此添加消息处理程序代码和/或调用默认值
    GetDlgItem(IDC_BUTTON)->SetWindowText("Hover");
    m_bTracking = false;
    CDialogEx::OnMouseHover(nFlags, point);



void CmfcDlgDlg::OnMouseLeave()

    // TODO: 在此添加消息处理程序代码和/或调用默认值
    GetDlgItem(IDC_BUTTON)->SetWindowText("Leave");
    m_bTracking = false;
    CDialogEx::OnMouseLeave();