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procedure TForm1.FormMouseDown(Sender: TObject; Button: TMouseButton;
Shift: TShiftState; X, Y: Integer);
begin
ReleaseCapture;
Perform(WM_SYSCOMMAND,$f012,0); //开始拖动窗体
end;
http://blog.csdn.net/diligentcatrich/article/details/7008516
dephi中单击鼠标拖动窗口(使用WM_SYSCOMMAND)
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原文地址:http://www.cnblogs.com/findumars/p/5218026.html