本文整理自网络，侵删。
本例效果图:
自定义类(TMyShape)单元 :
--------------------------------------------------------------------------------
unit Unit2;
interface
uses
Classes, Controls, ExtCtrls;
type
TMyShape = class(TShape)
private
fMouseFlag: Boolean;
fx,fy: Integer;
protected
procedure MouseDown(Button: TMouseButton; Shift: TShiftState; X: Integer;
Y: Integer); override;
procedure MouseUp(Button: TMouseButton; Shift: TShiftState; X: Integer;
Y: Integer); override;
procedure MouseMove(Shift: TShiftState; X: Integer; Y: Integer); override;
end;
implementation
{ TMyShape }
procedure TMyShape.MouseDown(Button: TMouseButton; Shift: TShiftState; X,
Y: Integer);
begin
inherited;
fx := X;
fy := Y;
fMouseFlag := True;
end;
procedure TMyShape.MouseMove(Shift: TShiftState; X, Y: Integer);
begin
inherited;
if fMouseFlag then
begin
Left := Left + X - fx;
Top := Top + Y - fy;
end;
end;
procedure TMyShape.MouseUp(Button: TMouseButton; Shift: TShiftState; X,
Y: Integer);
begin
inherited;
fMouseFlag := False;
end;
end.
--------------------------------------------------------------------------------
调用测试:
--------------------------------------------------------------------------------
unit Unit1;
interface
uses
Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,
Dialogs, StdCtrls;
type
TForm1 = class(TForm)
Button1: TButton;
procedure Button1Click(Sender: TObject);
end;
var
Form1: TForm1;
implementation
{$R *.dfm}
uses Unit2;
procedure TForm1.Button1Click(Sender: TObject);
begin
Randomize;
with TMyShape.Create(Self) do begin
Brush.Color := Random($FFFFFF);
Parent := Self;
Left := 10;
Top := 10;
end;
end;
end.
相关阅读 >>
Delphi 中的哈希表: thashedstringlist
Delphi 如何在程序中动态设置墙纸（使用iactivedesktop接口）
Delphi xe8在firemonkey tlistbox中显示图像
更多相关阅读请进入《Delphi》频道 >>
