subject_53078.htm

vc

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序号：53078 发表者：hls 发表日期：2003-09-17 09:57:37
<br>主题：鼠标 十字
<br>内容：我用鼠标会只“十字”，代码如下<BR><BR>void CVpView::OnMouseMove(UINT nFlags, CPoint point) <BR>&nbsp;&nbsp;{<BR>&nbsp;&nbsp;CRect rect;<BR>&nbsp;&nbsp;GetClientRect(&amp;rect);<BR>&nbsp;&nbsp;CClientDC* pDC = new CClientDC(this);&nbsp;&nbsp; <BR>&nbsp;&nbsp;nOldMode= pDC-&gt;GetROP2();<BR>&nbsp;&nbsp;pDC-&gt;SetROP2(R2_NOT);<BR>&nbsp;&nbsp;pDC-&gt;MoveTo(0,Anchor.y);<BR>&nbsp;&nbsp;pDC-&gt;LineTo(rect.Width(),Anchor.y);<BR>&nbsp;&nbsp;pDC-&gt;MoveTo(Anchor.x,0);<BR>&nbsp;&nbsp;pDC-&gt;LineTo(Anchor.x,rect.Height());<BR> <BR>&nbsp;&nbsp; pDC-&gt;MoveTo(0,point.y);<BR>&nbsp;&nbsp;&nbsp;&nbsp;pDC-&gt;LineTo(rect.Width(),point.y);<BR>&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;&nbsp;pDC-&gt;MoveTo(point.x,0);<BR>&nbsp;&nbsp;&nbsp;&nbsp;pDC-&gt;LineTo(point.x,rect.Height());<BR> <BR>&nbsp;&nbsp;Anchor.x=point.x;<BR>&nbsp;&nbsp;Anchor.y=point.y;<BR>&nbsp;&nbsp;pDC-&gt;SetROP2(nOldMode); <BR>delete&nbsp;&nbsp;pDC; <BR>CView::OnMouseMove(nFlags, point);<BR>}<BR>请教：如何教鼠标第一次进入客户区市所绘的“十字”擦除；另外鼠标从客户区出去怎样擦除出客户区前的最后一点的“十字”？<BR>
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<font color=red>答案被接受</font><br>回复者：iamhere 回复日期：2003-09-17 10:08:20
<br>内容：可以处理WM_MOUSEHOVER（鼠标第一次进入）和WM_MOUSELEAVE（鼠标离开）消息
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回复者：hls 回复日期：2003-09-18 10:59:14
<br>内容：再帮个忙，如何获得鼠标第一次进入客户区时的坐标 ？&nbsp;&nbsp;
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回复者：iamhere 回复日期：2003-09-18 11:57:36
<br>内容：WM_MOUSEHOVER消息中的LPARAM参数含义如下：<BR>lParam <BR>The low-order word specifies the x-coordinate of the cursor. The coordinate is relative to the upper-left corner of the client area. <BR>The high-order word specifies the y-coordinate of the cursor. The coordinate is relative to the upper-left corner of the client area. <BR><BR>
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回复者：hls 回复日期：2003-09-18 15:28:04
<br>内容： 谢谢！可以告诉我 OnMouseEnter&nbsp;&nbsp;怎么用吗？
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回复者：iamhere 回复日期：2003-09-18 15:39:22
<br>内容：OnMouseEnter???这是什么东东？
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回复者：hls 回复日期：2003-09-18 15:42:41
<br>内容：The OnMouseEnter method also allows derived classes to handle the event without attaching a delegate. This is the preferred technique for handling the event in a derived class.<BR><BR>Notes to Inheritors:&nbsp;&nbsp;When overriding OnMouseEnter in a derived class, be sure to call the base class's OnMouseEnter method so that registered delegates receive the event.<BR><BR>
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