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<title>在TMemo组件上画图 </title>
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<div align="center" class="btitle">在TMemo组件上画图 <br>
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<div align="center"><strong>CoDelphi.com </strong></div>
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摘 要</b>：使用WM_PAINT消息在TMemo组件上画图 <br>
<b> 关键字</b>：WM_PAINT TMEMO <br>
<b> 类 别</b>：用户界面
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<span class="content"><br> 为了在TMemo组件表面画图，我们应当创造TMemo的子类，并重载它的drawing方法.具体做法如下：<br><br>type<br> TMyMemo = class(TMemo)<br> protected<br> procedure WMPaint(var Message: TWMPaint); message WM_PAINT;<br> end;<br> 插入到程序的实现部分：<br><br>procedure TMyMemo.WMPaint(var Message: TWMPaint); <br>var<br> MCanvas: TControlCanvas;<br> DrawBounds : TRect; <br>Begin<br> inherited;<br> MCanvas:=TControlCanvas.Create;<br> DrawBounds := ClientRect; // 生成临时TRect类型记录<br> Try<br> MCanvas.Control:=Self;<br> With MCanvas do<br> Begin<br> Brush.Color := clBtnFace;<br> FrameRect( DrawBounds );<br> InflateRect( DrawBounds, -1, -1);<br> FrameRect( DrawBounds );<br> FillRect ( DrawBounds );<br> MoveTo ( 33, 0 );<br> Brush.Color := clWhite;<br> LineTo ( 33, ClientHeight );<br> PaintImages;<br> end;<br> finally<br> MCanvas.Free;<br> End; <br>end;<br> 这个PaintImages过程在Memo的画布上画图象。 <br><br>procedure TMyMemo.PaintImages; <br>var<br> MCanvas: TControlCanvas;<br> DrawBounds : TRect;<br> i, j : Integer;<br> OriginalRegion : HRGN;<br> ControlDC : HDC; <br>begin<br> MCanvas:=TControlCanvas.Create;<br> DrawBounds := ClientRect; // 生成临时TRect类型记录<br> try<br> MCanvas.Control:=Self;<br> ControlDC := GetDC ( Handle );<br> MCanvas.Draw(0, 1, Application.Icon);<br> finally<br> MCanvas.Free;<br> end; <br>end;<br> 现在你有了你自己的drawing memo类。</span>
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