VC++鼠标进入离开窗口

思路：其实windows是有WM_MOUSELEAVE（鼠标离开）和WM_MOUSEHOVER（鼠标进入）消息的，不过它们需要我们手动来打开才可以使用

下面我要实现每次鼠标移入窗口调用OnMouseHover函数，每次鼠标移出窗口调用OnMouseLeave函数

声明一个变量，标识是否打开鼠标离开与进入的消息响应

bool m_bTracking;

增加三个消息的响应

声明：

afx_msg void OnMouseMove(UINT nFlags, CPoint point);
afx_msg LRESULT OnMouseLeave(WPARAM, LPARAM);
afx_msg LRESULT OnMouseHover(WPARAM, LPARAM);

消息映射：

BEGIN_MESSAGE_MAP(CThreadDlg, CDialog)
ON_WM_MOUSEMOVE()
ON_MESSAGE(WM_MOUSELEAVE,OnMouseLeave)
ON_MESSAGE(WM_MOUSEHOVER,OnMouseHover)
END_MESSAGE_MAP()

实现：

void CThreadDlg::OnMouseMove(UINT nFlags, CPoint point)
{
if (!m_bTracking)
{ //打开鼠标进入与离开的消息监听
TRACKMOUSEEVENT tme;
tme.cbSize = sizeof(tme);
tme.hwndTrack = m_hWnd;
tme.dwFlags = TME_LEAVE | TME_HOVER;
tme.dwHoverTime = 1;
m_bTracking = _TrackMouseEvent(&tme);
}
CDialog::OnMouseMove(nFlags, point);
}
LRESULT CThreadDlg::OnMouseLeave(WPARAM wParam,LPARAM lParam)
{
m_bTracking = false;//每次进入重新打开，否则还是不会监听的
return 1;
}

LRESULT CThreadDlg::OnMouseHover(WPARAM wParam,LPARAM lParam)
{
return 1;
}