判断鼠标进入和离开mfc控件的模板类

原创于 2011-07-23 17:17:12 发布 · 1.5k 阅读

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本文介绍了一个名为CTrackControl的类，该类继承自BaseClass并实现了鼠标悬停和离开的跟踪功能。通过重写WindowProc方法，能够响应WM_MOUSEMOVE、WM_MOUSEHOVER及WM_MOUSELEAVE消息，并调用相应的OnHoverEnter和OnHoverLeave方法。

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#pragma once

template<class BaseClass>
class CTrackControl : public BaseClass
{
public:
CTrackControl(){ m_bTracking=m_bHover=FALSE;}
virtual ~CTrackControl() {}
BOOLEAN IsHover(){ return m_bHover; }

public:

virtual void OnHoverEnter()=0;
virtual void OnHoverLeave()=0;

protected:

virtual LRESULT WindowProc(UINT nMessage, WPARAM wParam, LPARAM lParam)

{
LRESULT nResult=BaseClass::WindowProc(nMessage,wParam,lParam);
switch(nMessage)
{
case WM_MOUSEMOVE:
{
if (!m_bTracking)
{
TRACKMOUSEEVENT Tme;
Tme.cbSize = sizeof(Tme);
Tme.hwndTrack = GetSafeHwnd();
Tme.dwFlags = TME_LEAVE|TME_HOVER;
Tme.dwHoverTime = 1;
if (_TrackMouseEvent(&Tme))
m_bTracking=TRUE;
}
break;
}
case WM_MOUSEHOVER:
m_bHover=TRUE;
OnHoverEnter();
break;
case WM_MOUSELEAVE:
m_bTracking=m_bHover=FALSE;
OnHoverLeave();
break;
}
return nResult;
}

private:
BOOLEAN m_bTracking;
BOOLEAN m_bHover;
};