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Paint;
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procedure Paint; virtual;
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procedure TGraphicControl.Paint;
begin
end;
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ÄÇôÊÇ˵÷ÓÃÁËÕâ¸öº¯ÊýÀ´ÒýÆð»¿Ø¼þÄØ¡£WindowsÓÐÒ»¸öWM_PAINT;ÏûÏ¢£¬µ±Ò»ÇÐÒýÆðÖØ»µÄÌõ¼þ·¢Éú£¬Ôò»á·¢ËÍÕâÌõÏûÏ¢£¬ÔÙ¿´¿´TGraphicControl£¬¹ûÈ»ÓнػñÕâ¸öÏûÏ¢£º
procedure WMPaint(var Message: TWMPaint); message WM_PAINT;
ÔÚ´¦Àíº¯ÊýÀïÃ棬µ÷ÓÃÁËPaint·½·¨£¬´Ó¶øʵÏÖÁ˻ͼÐοؼþ¿ÉÄÜ£º
procedure TGraphicControl.WMPaint(var Message: TWMPaint);
begin
if Message.DC <> 0 then
begin
Canvas.Lock;
try
Canvas.Handle := Message.DC;
try
Paint; //µ÷ÓÃÁËÕâ¸öº¯ÊýÀ´»Í¼Ðοؼþ
finally
Canvas.Handle := 0;
end;
finally
Canvas.Unlock;
end;
end;
end;
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procedure TForm1.Button3Click(Sender: TObject);
begin
//ÏÔʾ´´½¨µÄÊý¾Ý¼¯: dbgrid->datasource->clientdataset
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cds1.FieldDefs.Add('aa',ftString,40);
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