MFC鼠标悬停与离开

鼠标悬停与离开

说明： MFC默认的情况下，是不会触发鼠标悬停和离开的消息。

手动添加输小悬停和离开消息及消息处理函数

1. 声明并定义函数（其中IDC_ BUTTON_ OK为目标按钮，IDC_ EDIT_ DEST为任意Edit控件,只为转移焦点）

   LRESULT xxxDlg::OnMouseLeave(WPARAM Wparam, LPARAM lParam)
   {
       // TODO:  在此添加消息处理程序代码和/或调用默认值
       POINT p;
       GetCursorPos(&p);
       CWnd *hwnd;
       hwnd = WindowFromPoint(p);
       CWnd *hWndOk = GetDlgItem(IDC_BUTTON_OK);
       if (hWndOk == hwnd)
       {
           GetDlgItem(IDC_BUTTON_OK)->SetFocus();
           m_bEditHover = FALSE;
       }
       m_bTracking = TRUE;
       return 0;
   }
   
   
   LRESULT xxxDlg::OnMouseHover(WPARAM Wparam, LPARAM lParam)
   {
       // TODO:  在此添加消息处理程序代码和/或调用默认值
       GetDlgItem(IDC_STATIC)->SetFocus();
       if (m_bEditHover)
       {
           GetDlgItem(IDC_EDIT_DEST)->SetFocus();
       }
       m_bTracking = FALSE;
       return 0;
   }
   

2. 利用框架添加鼠标移动消息

   void CChoseWay::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
       if (m_bTracking)
       {
           TRACKMOUSEEVENT tme;
           tme.cbSize = sizeof(TRACKMOUSEEVENT);
           tme.dwFlags = TME_LEAVE | TME_HOVER;
           tme.hwndTrack = this->m_hWnd;
           tme.dwHoverTime = 100;
           if (::_TrackMouseEvent(&tme))
           {
               m_bTracking = FALSE;
           }
       }
       CDialogEx::OnMouseMove(nFlags, point);
   }
   

   tme.dwHoverTime = 100,意为停在按钮上100ms才会触发悬停消息。

3. 手动添加消息响应

   BEGIN_MESSAGE_MAP(CChoseWay, CDialogEx)
       ON_BN_CLICKED(IDC_BUTTON_OK, &CChoseWay::OnBnClickedButton1)
       ...
       ON_MESSAGE(WM_MOUSEHOVER, OnMouseHover)
       ON_MESSAGE(WM_MOUSELEAVE, OnMouseLeave)
       ON_WM_MOUSEMOVE()
   END_MESSAGE_MAP()