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_TrackMouseEventfunction posts messages when the mouse pointer leaves a window or hovers over a window for a specified amount of time. This function callsTrackMouseEventif 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);
}

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