OnMouseHover()和OnMouseLeave()(让窗口捕获并响应WM_MOUSEHOVER和WM_MOUSELEAVE消息)
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当鼠标停留在程序窗口一定时间后,会产生一个WM_MOUSEHOVER消息;当鼠标离开程序窗口后,会产生一个WM_MOUSELEAVE消息。那如何才能使窗口响应这两个消息呢?按下面的步骤,即可让指定的窗口能捕获并响应WM_MOUSEHOVER和WM_MOUSELEAVE消息了:
1、在窗口类的头文件中添加:
afx_msg void OnMouseLeave();afx_msg void OnMouseMove(UINT nFlags, CPoint point);
2、在窗口类的cpp文件中添加:
void CXXXWnd::OnMouseHover() { MessageBox( "鼠标已进入 "); m_bTrackLeave = FALSE; } void CXXXWnd::OnMouseLeave() { MessageBox( "鼠标已离开 "); m_bTrackLeave = FALSE; }
3、用ON_MESSAGE添加消息映射:
//vs2008以上添加以下代码ON_MESSAGE( WM_MOUSEHOVER, OnMouseHover ) ON_MESSAGE( WM_MOUSELEAVE, OnMouseLeave ) //vs2003添加以下代码//自定消息ON_MESSAGE(WM_MOUSELEAVE,OnMouseLeave)
4、在OnMouseMove响应函数中,调用_TrackMouseEvent(),设置捕获WM_MOUSEHOVER和WM_MOUSELEAVE消息请求:
void CXXXWnd::OnMouseMove(UINT nFlags, CPoint point) { if (!m_bTracking) { // 鼠标移入窗时,请求WM_MOUSEHOVER和WM_MOUSELEAVE 消息 TRACKMOUSEEVENT tme; tme.cbSize = sizeof(tme); tme.hwndTrack = m_hWnd; tme.dwFlags = TME_LEAVE|TME_HOVER; tme.dwHoverTime = 1; m_bTracking = _TrackMouseEvent(&tme); } CWnd::OnMouseMove(nFlags, point); }
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