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          <TD align=right><A href="http://www.csdn.net/">CSDN</A> - <A 
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            color=#003399>Visual C++</FONT>&nbsp;&nbsp;&nbsp;&nbsp; </TD></TR>
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            color=#ffffff>标题</FONT></TD>
          <TD><B>&nbsp;&nbsp;&nbsp;&nbsp;怎样为任何控件和区域添加提示信息:用自己封装的CTip类</B>&nbsp;&nbsp;&nbsp;&nbsp;flower(原作) 
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          <TD 
        width=500>&nbsp;&nbsp;&nbsp;&nbsp;怎样为任何控件和区域添加提示信息:用自己封装的CTip类</TD></TR>
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          <TD align=left><BR>MFC中有一个CToolTipCtrl类,想必大家都知道,近来我在一个项目中需要在ActiveX 
            Control上为特定的控件或区域添加提示.开始使用CToolTipCtrl,但发现它根本就不工作.无奈,只好自己写了一个类来实现它.<BR>该类为CTip(包含CTip.c和CTip.h)<BR>你只需在你的工程中加入它,就可以使用.<BR>使用步骤:<BR>&nbsp; 
            &nbsp; &nbsp; &nbsp; 1.在初始化时Create(CWnd* pParentWnd).<BR>&nbsp; 
            &nbsp; &nbsp; &nbsp; 2.在MoseMove(CPoint point)中调用SetText(const 
            CString&amp; rsText)来设置要显示的文本.<BR>&nbsp; &nbsp; &nbsp; &nbsp; 
            3.在MoseMove(CPoint point)中调用Show(CPoint 
            point)显示该提示.<BR>使用说明:<BR>&nbsp; &nbsp; &nbsp; &nbsp; 
            1.Create中所作的是用CreateEX来创建一个窗口,这个窗口的大小为0,显示标题为空,风格为WS_POPUP&brvbar;WS_CHILD&brvbar;WS_CLIPSIBLINGS<BR>&nbsp; 
            &nbsp; &nbsp; &nbsp; 
            2.这里有一个技巧,你必须知道当你的鼠标位于哪个范围时,该提示应当出现.因此你可以有两种选择:之一,你直接指定该范围(设置一个CRect)或是添加一个成员变量来动态记录该范围;之二,你可以调用如下:&nbsp; 
            <BR>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; CRect rect;<BR>&nbsp; &nbsp; 
            &nbsp; &nbsp; &nbsp; CWnd* pwnd = GetDlgItem(ID_xxx);<BR>&nbsp; 
            &nbsp; &nbsp; &nbsp; &nbsp; 
            pwnd-&gt;GetWindowRect(&amp;rect);<BR>&nbsp; &nbsp; &nbsp; &nbsp; 
            &nbsp; ScreenToClient(&amp;rect);<BR>&nbsp; &nbsp; &nbsp; &nbsp; 
            &nbsp; 这样也可以得到当前的rect.然后你可以调用如下:<BR>&nbsp; &nbsp; &nbsp; &nbsp; 
            &nbsp; if(rect.PtInRect(point))<BR>&nbsp; &nbsp; &nbsp; &nbsp; 
            &nbsp; {<BR>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 
            m_tip.SetText(m_varname);<BR>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; 
            &nbsp; &nbsp; m_tip.Show(point);<BR>&nbsp; &nbsp; &nbsp; &nbsp; 
            &nbsp; }<BR>&nbsp; &nbsp; &nbsp; &nbsp; &nbsp; else <BR>&nbsp; 
            &nbsp; &nbsp; &nbsp; &nbsp; {&nbsp; &nbsp; &nbsp; &nbsp; <BR>&nbsp; 
            &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; &nbsp; m_tip.Close();<BR>&nbsp; 
            &nbsp; &nbsp; &nbsp; &nbsp; }<BR>&nbsp; &nbsp; &nbsp; &nbsp; 
            3.show和close用来显示和隐藏提示,在show中主要是利用CDC来进行绘制提示.<BR>几个主要函数的具体代码:<BR>BOOL 
            CToolTip2::Create(CWnd* pParentWnd)<BR>{<BR>ASSERT(this != NULL 
            );<BR>ASSERT(pParentWnd != NULL);<BR><BR>m_pParentWnd = 
            pParentWnd;<BR>//&nbsp; Create font<BR>CRect 
            rectInitialSize(0,0,0,0);//Initial Window size. Will be dynamically 
            <BR>return CreateEx(NULL, NULL, NULL,WS_POPUP &brvbar;&nbsp; WS_CHILD &brvbar; 
            WS_CLIPSIBLINGS,<BR>&nbsp; rectInitialSize,pParentWnd, NULL, 
            NULL);<BR>}<BR><BR>BOOL CToolTip2::Show(const CPoint&amp; 
            rCurrentPoint)<BR>{<BR>ASSERT(this != NULL );<BR>ASSERT(m_hWnd != 
            NULL );<BR>//&nbsp; Is text empty or tool tip already 
            displayed?<BR>if ( m_szText.IsEmpty() &brvbar;&brvbar; m_bShowStatus)<BR>&nbsp; 
            return FALSE;<BR>m_ptCurrent = rCurrentPoint;<BR>m_bShowStatus = 
            TRUE;<BR>//&nbsp; show tool 
            tip<BR>DisplayToolTip(rCurrentPoint);<BR>return 
            TRUE;<BR>}<BR><BR>void CToolTip2::DisplayToolTip(const CPoint&amp; 
            rCurrentPoint)<BR>{<BR>CDC* pDC = GetDC();<BR>CBrush&nbsp; 
            *pOldBrush;<BR>CFont *pOldFont;<BR><BR>pOldFont = 
            pDC-&gt;SelectObject(&amp;m_font);<BR>CSize size = 
            pDC-&gt;GetTextExtent(m_szText);<BR>pDC-&gt;LPtoDP(&amp;size);<BR>//&nbsp; 
            form tooltip rectangle<BR>CRect rectToolTip(rCurrentPoint.x, 
            rCurrentPoint.y, <BR>rCurrentPoint.x+size.cx+7, 
            rCurrentPoint.y+size.cy+2);<BR>//&nbsp; draw Tooltip Rect and 
            Text<BR>pDC-&gt;SetBkMode(TRANSPARENT);<BR>CBrush 
            brushToolTip(GetSysColor(COLOR_INFOBK));<BR>pOldBrush = 
            pDC-&gt;SelectObject(&amp;brushToolTip);<BR>//&nbsp; Create and 
            select thick black pen<BR>CPen penBlack(PS_SOLID, 0, COLORREF(RGB(0, 
            0, 0)));<BR>CPen* pOldPen = 
            pDC-&gt;SelectObject(&amp;penBlack);<BR>//&nbsp; draw rectangle 
            filled with 
            COLOR_INFOBK<BR>pDC-&gt;Rectangle(0,0,rectToolTip.Width(),rectToolTip.Height());<BR>//&nbsp; 
            draw tooltip text<BR>&nbsp; &nbsp; pDC-&gt;SetTextColor( 
            GetSysColor(COLOR_INFOTEXT) );//Tool Tip color set in <BR>//&nbsp; 
            control panel 
            settings<BR>pDC-&gt;SetTextAlign(TA_LEFT);<BR>pDC-&gt;TextOut(3,1, 
            m_szText);<BR>CRect rectWnd = 
            rectToolTip;<BR>m_pParentWnd-&gt;ClientToScreen(rectWnd); //&nbsp; 
            Convert from client to screen <BR>CPoint ptToolTipLeft = 
            rectWnd.TopLeft();<BR>//&nbsp; now display 
            tooltip<BR>SetWindowPos(&amp;wndTop,ptToolTipLeft.x+1, 
            ptToolTipLeft.y+1, rectWnd.Width(), 
            <BR>rectWnd.Height(),SWP_SHOWWINDOW&brvbar;SWP_NOOWNERZORDER&brvbar;SWP_NOACTIVATE);<BR>// 
            put back old 
            objects<BR>pDC-&gt;SelectObject(pOldBrush);<BR>pDC-&gt;SelectObject(pOldPen);<BR>pDC-&gt;SelectObject(pOldFont);<BR>ReleaseDC(pDC);<BR>}<BR></TD></TR></TBODY></TABLE></TD></TR></TBODY></TABLE><BR>
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      hspace=1 src="CSDN_文档中心_怎样为任何控件和区域添加提示信息用自己封装的CTip类.files/ico_pencil.gif" 
      width=16> </SPAN>&nbsp;&nbsp;&nbsp;&nbsp; wuya <I>(2000-12-19 9:54:04)</I> 
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    <TD bgColor=#ffffff colSpan=3 width=532><BR>CToolTipCtrl可以完成这样的功能,你走远了。 
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