演示 Rect、Bounds 生成 TRect 的区别

本例效果图:

---

unit Unit1;



interface



uses

  Windows, Messages, SysUtils, Variants, Classes, Graphics, Controls, Forms,

  Dialogs, StdCtrls, ExtCtrls;



type

  TForm1 = class(TForm)

    Button1: TButton;

    RadioGroup1: TRadioGroup;

    procedure RadioGroup1Click(Sender: TObject);

    procedure FormCreate(Sender: TObject);

  end;



var

  Form1: TForm1;



implementation



{$R *.dfm}



var

  R: TRect;



procedure TForm1.FormCreate(Sender: TObject);

begin

  RadioGroup1.Items.CommaText := 'Undo,Rect,Bounds';

  R := Button1.BoundsRect;

end;



procedure TForm1.RadioGroup1Click(Sender: TObject);

begin

  case RadioGroup1.ItemIndex of

    0: Button1.BoundsRect := R;

    1: Button1.BoundsRect := Rect(50,50,100,80);  {参数3、4 是一个点}

    2: Button1.BoundsRect := Bounds(50,50,100,80);{参数3、4 分别是宽度与高度}

  end;

end;



end.