trackmouseevent.shtml
来自「mfc资源大全包含MFC编程各个方面的源码」· SHTML 代码 · 共 173 行
SHTML
173 行
<HTML><HEAD> <META HTTP-EQUIV="Content-Type" CONTENT="text/html; charset=iso-8859-1"> <META NAME="Author" CONTENT="Zafir Anjum"> <TITLE>Miscellaneous - Using TrackMouseEvent to find out when the mouse leaves your window</TITLE></HEAD><body background="../fancyhome/back.gif" bgcolor="#FFFFFF" link="#B50029" vlink="#8E2323" alink="#FF0000" bgproperties="fixed"><table WIDTH="100%"><tr WIDTH="100%"><td align=center><!--#exec cgi="/cgi/ads.cgi"--><td></tr></table><CENTER><H3><FONT COLOR="#AOAO99">Using TrackMouseEvent to find out when the mouse leaves your window</FONT></H3></CENTER><HR>This code was contributed by <AHREF="mailto:douglas.peterson@telex.com">Douglas Peterson</A>.<p>Using TrackMouseEvent is pretty simple. When the mouse enters thewindow you want to track, you call track mouse event telling it toinform you when the mouse leaves. When it does, it will send aWM_MOUSELEAVE message to that window.<p>If you add this code to any of your existing view classes (or any CWndderived class), you will see a drag rectangle that follows the mousecursor around. If you move the mouse outside the window, it willdisappear. If you move the mouse back into the window, it willreappear.<pre><tt><font COLOR="#990000">********************************************************************************// TrackView.h changes//class CTrackView : public CView{// Add data membersprotected: CRect m_rectLast; //** Added line BOOL m_bMouseTracking; //** Added line// Add message handler prototype afx_msg LRESULT OnMouseLeave(WPARAM wParam, LPARAM lParam); //** Added line};****************************************************************************************// TrackView.cpp changes//// Add message handlerBEGIN_MESSAGE_MAP(CTrackView, CView) ON_MESSAGE(WM_MOUSELEAVE, OnMouseLeave) //** Added lineEND_MESSAGE_MAP()CTrackView::CTrackView(){ m_bMouseTracking = FALSE; //** Added line}/////////////////////////////////////////////////////////////////////////////// CTrackView message handlers//** Added functionLRESULT CTrackView::OnMouseLeave(WPARAM wParam, LPARAM lParam){ // Draw last rect, but no new one (erase old rect) CClientDC dc(this); dc.DrawDragRect(CRect(0,0,0,0), CSize(0,0), m_rectLast, CSize(2,2)); m_rectLast = CRect(0,0,0,0); m_bMouseTracking = FALSE; return TRUE;}void CTrackView::OnMouseMove(UINT nFlags, CPoint point) { // Calc new rectangle CRect rectNew(point.x-20, point.y-20, point.x+20, point.y+20); CClientDC dc(this); // WM_MOUSEMOVE + !m_bMouseTracking becomes the equivalent of // WM_MOUSEENTER of which there is no such thing. if (!m_bMouseTracking) { TRACKMOUSEEVENT tme; tme.cbSize = sizeof(TRACKMOUSEEVENT); tme.dwFlags = TME_LEAVE; tme.hwndTrack = this->m_hWnd; if (::_TrackMouseEvent(&tme)) { m_bMouseTracking = TRUE; // Draw new rect, but no last rect as we are starting anew dc.DrawDragRect(rectNew, CSize(2,2), NULL, CSize(0,0)); } } else { // Draw new rect and erase old rect dc.DrawDragRect(rectNew, CSize(2,2), m_rectLast, CSize(2,2)); } // Remember where we drew this rectangle m_rectLast = rectNew; CView::OnMouseMove(nFlags, point);}****************************************************************************************</font></tt></pre><p>Here's a helper class I use to make it a little simpler:<pre><tt><font COLOR="#990000">class CTrackMouseEvent : public tagTRACKMOUSEEVENT{public: CTrackMouseEvent(CWnd* pWnd, DWORD dwFlags = TME_LEAVE, DWORD dwHoverTime = HOVER_DEFAULT) { ASSERT_VALID(pWnd); ASSERT(::IsWindow(pWnd->m_hWnd)); this->cbSize = sizeof(TRACKMOUSEEVENT); this->dwFlags = dwFlags; this->hwndTrack = pWnd->m_hWnd; this->dwHoverTime = dwHoverTime; } BOOL Track() { return _TrackMouseEvent(this); }};</font></tt></pre><p>You can start tracking like this:<pre><tt><font COLOR="#990000">if (!m_bMouseTracking) m_bMouseTracking = CTrackMouseEvent(this).Track();</font></tt></pre> <P><HR><TABLE BORDER=0 WIDTH="100%" ><TR><TD WIDTH="33%"><FONT SIZE=-1><A HREF="http://www.codeguru.com">Goto HomePage</A></FONT></TD><TD WIDTH="33%"><CENTER><FONT SIZE=-2>© 1998 Zafir Anjum</FONT> </CENTER></TD><TD WIDTH="34%"><DIV ALIGN=right><FONT SIZE=-1>Contact me: <A HREF="mailto:zafir@home.com">zafir@home.com</A> </FONT></DIV></TD></TR></TABLE></BODY></HTML>⌨️ 快捷键说明
复制代码Ctrl + C
搜索代码Ctrl + F
全屏模式F11
增大字号Ctrl + =
减小字号Ctrl + -
显示快捷键?