WM_MOUSELEAVE和WM_MOUSEHOVER使用

默认情况下,窗口是不响应 WM_MOUSELEAVE 和 WM_MOUSEHOVER 消息的,所以要使用 _TrackMouseEvent 函数来激活这两个消息。调用这个函数后,当鼠标在指定窗口上停留超过一定时间或离开窗口后,该函数会 Post 这两个消息到指定窗口。


使用方法:
1. 在对话框类中定义一个变量来标识是否追踪当前鼠标状态,之所以要这样定义是要避免鼠标已经在窗体之上时,一移动鼠标就不断重复产生 WM_MOUSEHOVER 。 
BOOL _bMouseTrack=TRUE ;


2. 在 OnMouseMove 中调用 _TrackMouseEvent 函数 
 if (_bMouseTrack)     // 若允许 追踪,则。 
 {
  TRACKMOUSEEVENT csTME;
  csTME.cbSize = sizeof (csTME);
  csTME.dwFlags = TME_LEAVE|TME_HOVER;
  csTME.hwndTrack = m_hWnd ;// 指定要 追踪 的窗口 
  csTME.dwHoverTime = 10;  // 鼠标在按钮上停留超过 10ms ,才认为状态为 HOVER
  ::_TrackMouseEvent (&csTME); // 开启 Windows 的 WM_MOUSELEAVE , WM_MOUSEHOVER 事件支持


 
_bMouseTrack=FALSE ;   // 若已经 追踪 ,则停止 追踪 
 }

(#add  摘自MSDN:The _TrackMouseEvent function posts messages when the mouse pointer leaves a window or hovers over a window for a specified amount of time. This function calls TrackMouseEvent if it exists, otherwise it emulates it.)
3. 在 OnMouseLeave 中再次允许追踪鼠标状态 
_bMouseTrack=TRUE ;


4. 备注:这两个消息的映射要自己写 
 ON_MESSAGE(WM_MOUSEHOVER,OnMouseHover)
 ON_MESSAGE(WM_MOUSELEAVE,OnMouseLeave)

 

 

注意:也可以用下面代码在PreTranslateMessage函数中接收,不需要自己写WM_MOUSELEASE和WM_MOUSEHOVER消息的响应函数(当然你要自己写也行): 
if(pMsg-> message==WM_MOUSELEAVE)   
        AfxMessageBox( "mouse   leave ");

else if(pMsg->message == WM_MOUSEHOVER)

       AfxMessageBos("mouse leave");


return   CDialog::PreTranslateMessage(pMsg); 

附一个例子:

.h文件加入: 
afx_msg       LRESULT     OnMouseLeave(WPARAM   ,LPARAM   );       
afx_msg       LRESULT     OnMouseHover(WPARAM   ,LPARAM   );       

.cpp文件加入: 
            ON_MESSAGE(WM_MOUSELEAVE,OnMouseLeave)       
            ON_MESSAGE(WM_MOUSEHOVER,OnMouseHover)  


LRESULT   CIconButton::OnMouseLeave(WPARAM     wParam,LPARAM   lParam)       
{     
InvalidateRect(NULL); 
return       0;       
}       

LRESULT     CIconButton::OnMouseHover(WPARAM       wParam,LPARAM       lParam)       

//获取鼠标坐标     

POINT point;
::GetCursorPos(&point);

ScreenToClient(&point) ;

 

//亦用如下方法,推荐.OnMouseMove 也可用.

 CPoint pt;

 pt.x = LOWORD(lParam); // horizontal position of cursor 
 pt.y = HIWORD(lParam); // vertical position of cursor

 

//还有如下,和上边其实是一样 

POINT pt = { GET_X_LPARAM(lParam), GET_Y_LPARAM(lParam) };


CClientDC   dc(this); 
CRect   rt; 
GetClientRect(&rt); 
dc.Draw3dRect(0,0, 
m_rect.right-m_rect.left,m_rect.bottom-m_rect.top, 
RGB(0,0,0),RGB(10,10,10)); 
return       0;       
}       


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

//   TODO:   Add   your   message   handler   code   here   and/or   call   default 
CButton::OnMouseMove(nFlags,   point); 
TRACKMOUSEEVENT       tme;       
tme.cbSize=sizeof(TRACKMOUSEEVENT);       
tme.dwFlags=TME_HOVER       |       TME_LEAVE;       
tme.dwHoverTime=HOVER_DEFAULT;     
tme.hwndTrack=m_hWnd;   
        _TrackMouseEvent(&tme);       


可用如下自定义宏:

#ifndef ON_WM_MOUSELEAVE
#define ON_WM_MOUSELEAVE() \
{ WM_MOUSELEAVE, 0, 0, 0, AfxSig_vv, \
(AFX_PMSG)(AFX_PMSGW) \
(static_cast< void (AFX_MSG_CALL CWnd::*)(void) > ( /*&ThisClass :: */OnMouseLeave)) },
#endif


#ifndef ON_WM_MOUSEHOVER
#define ON_WM_MOUSEHOVER() \
{ WM_MOUSEHOVER, 0, 0, 0, AfxSig_vwp, \
(AFX_PMSG)(AFX_PMSGW)(void (AFX_MSG_CALL CWnd::*)(UINT, CPoint))&OnMouseHover },
#endif

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