鼠标离开窗口时的捕获

Question

加上SetCapture ，在MouseMove中调用PtInRect判断，离开窗口就ReleaseCapture

Answer 1

两种方法:
1.
void CKeyButton::OnMouseMove(UINT nFlags, CPoint point) 
{
// TODO: Add your message handler code here and/or call default
RECT Rect;
GetClientRect(&Rect);
if(PtInRect(&Rect,point))
{
SetCapture(); //捕获鼠标
if(m_nClick!=1)
{
m_nOldState=m_nState;
m_nState=1;
if(m_nOldState!=m_nState)
this->Invalidate(); //Button redraw
}
}
else
{
ReleaseCapture(); //释放鼠标 m_nClick=0;
m_nState=0;
this->Invalidate(); //Button redraw
//AfxMessageBox("bye");
}
CButton::OnMouseMove(nFlags, point);
}或者
2.
void CKeyButtonCtrl::OnMouseMove(UINT nFlags, CPoint point) 
{
// TODO: Add your message handler code here and/or call default
if (m_nState==0)
{
// draw with button borders
m_nState = 1; //设置状态为moveon
Invalidate();

TRACKMOUSEEVENT TrackMouseEvent;
TrackMouseEvent.cbSize = sizeof(TrackMouseEvent);
TrackMouseEvent.dwFlags = TME_LEAVE;
TrackMouseEvent.hwndTrack = GetSafeHwnd();
TrackMouseEvent.dwHoverTime = HOVER_DEFAULT;
_TrackMouseEvent(&TrackMouseEvent); //捕获mouse leave
}
COleControl::OnMouseMove(nFlags, point);
}
LONG CKeyButtonCtrl::OnMouseLeave(WPARAM wParam, LPARAM lParam)
{
m_nState=0; //set normal
Invalidate(); return 0;
}