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覆巢之下焉有完卵。出来道上混,迟早是要还的。

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判断指针是否在控件内

2011-12-04 16:37:36| 分类：标准控件 | 标签： |举报 |字号大中小订阅

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测试鼠标是否在窗口内，以及鼠标的离开

以下给出两种跟踪鼠标是否在窗口内的方法
一、使用SetCapture(),OnMouseMove()等判断鼠标位置
//设置一个状态量用于记录和标识鼠标是否在窗口内
//BOOL m_bOverControl;

void C?????::OnMouseMove(UINT nFlags, CPoint point)
{
CStatic::OnMouseMove(nFlags, point);

//如果鼠标还在窗口内
if (m_bOverControl)
{
CRect rect;
GetClientRect(rect);
//鼠标位置离开了客户区,解除鼠标捕获，并改写状态量m_bOverControl
if (!rect.PtInRect(point))
{
m_bOverControl = FALSE;
ReleaseCapture();

//......
//其他鼠标离开时的操作
//eg: ReDrawWindow();

return;
}
}

//如果鼠标进入窗口,置鼠标捕获,状态参量
else
{
m_bOverControl = TRUE;

//
//其他鼠标进入时的操作
//eg: ReDrawWindow();

SetCapture();
}
}

二、使用TrackMouseEvent()在鼠标离开窗口时发送WM_MOUSELEAVE消息

使用TrackMouseEvent()还可以判断鼠标的停留，并发送WM_MOUSEHOVER消息
//设置一个状态量用于记录和标识鼠标是否在窗口内
//BOOL m_bMouseTracking;

//处理鼠标移动消息
void CSomeWnd::OnMouseMove(UINT nFlags, CPoint point)
{
//接收到WM_MOUSEMOVE,而m_bMouseTracking为假时，鼠标进入窗口。
//设置_TrackMouseEvent
if (!m_bMouseTracking)
{
TRACKMOUSEEVENT tme;
tme.cbSize = sizeof(TRACKMOUSEEVENT);
//监控鼠标离开
tme.dwFlags = TME_LEAVE;
tme.hwndTrack = this-> m_hWnd;

if (::_TrackMouseEvent(&tme))
{
m_bMouseTracking = TRUE;

//
//其他鼠标进入时的操作
//
}
}

CView::OnMouseMove(nFlags, point);
}

//
//处理WM_MOUSELEAVE消息
//

//消息处理函数声明
afx_msg LRESULT OnMouseLeave(WPARAM wParam, LPARAM lParam);

//消息映射
ON_MESSAGE(WM_MOUSELEAVE, OnMouseLeave)

//处理函数定义
LRESULT CSomeWnd::OnMouseLeave(WPARAM wParam, LPARAM lParam)
{
//
//其他鼠标离开时的操作
//

//重置状态量
m_bMouseTracking = FALSE;
return TRUE;
}

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