给 "blog V5" 的关于 TrackBar 控件的简单例子

问题来源: http://www.cnblogs.com/del/archive/2008/06/14/1220638.html#1225896

---

例一效果图:

---

例一代码:

---

unit Unit1;



interface



uses

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

  Dialogs, ComCtrls;



type

  TForm1 = class(TForm)

    TrackBar1: TTrackBar;

    procedure TrackBar1Change(Sender: TObject);

  end;



var

  Form1: TForm1;



implementation



{$R *.dfm}



procedure TForm1.TrackBar1Change(Sender: TObject);

begin

  Self.Text := IntToStr(TrackBar1.Position);

end;



end.


 
   

例二效果图:

---

例二代码:

---

unit Unit1;



interface



uses

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

  Dialogs, ComCtrls, StdCtrls;



type

  TForm1 = class(TForm)

    TrackBar1: TTrackBar;

    Button1: TButton;

    Button2: TButton;

    Button3: TButton;

    procedure FormCreate(Sender: TObject);

    procedure Button1Click(Sender: TObject);

    procedure Button2Click(Sender: TObject);

    procedure Button3Click(Sender: TObject);

  end;



var

  Form1: TForm1;



implementation



{$R *.dfm}



procedure TForm1.FormCreate(Sender: TObject);

begin

  Button1.Caption := '变';

  Button2.Caption := '再变';

  Button3.Caption := '还原';

end;



procedure TForm1.Button1Click(Sender: TObject);

begin

  TrackBar1.ShowSelRange := False;  

end;



procedure TForm1.Button2Click(Sender: TObject);

begin

  TrackBar1.Orientation := trVertical;

end;



procedure TForm1.Button3Click(Sender: TObject);

begin

  TrackBar1.ShowSelRange := True;

  TrackBar1.Orientation := trHorizontal;

end;



end.


 
   

例三效果图:

---

例三代码:

---

unit Unit1;



interface



uses

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

  Dialogs, ComCtrls, ExtCtrls;



type

  TForm1 = class(TForm)

    TrackBar1: TTrackBar;

    Panel1: TPanel;

    procedure FormCreate(Sender: TObject);

    procedure TrackBar1Change(Sender: TObject);

  end;



var

  Form1: TForm1;



implementation



{$R *.dfm}



procedure TForm1.FormCreate(Sender: TObject);

begin

  TrackBar1.ShowSelRange := False;

  TrackBar1.Min := 1;

  TrackBar1.Max := ClientWidth;

  TrackBar1.Position := ClientWidth div 2;

  TrackBar1.Height := 23;

  Panel1.Left := 0;

end;



procedure TForm1.TrackBar1Change(Sender: TObject);

begin

  Panel1.Width := TrackBar1.Position;

end;



end.