unit1.pas

Delphi编程实效百例的随书程序 这是其中的界面操作部分

unit Unit1;

interface

uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
  StdCtrls, ExtCtrls;

type
  TForm1 = class(TForm)
    Image1: TImage;
    movebt: TButton;
    bigbt: TButton;
    smallbt: TButton;
    exitbt: TButton;
    Timer1: TTimer;
    Timer2: TTimer;
    Timer3: TTimer;
    procedure exitbtClick(Sender: TObject);
    procedure FormCreate(Sender: TObject);
    procedure movebtMouseDown(Sender: TObject; Button: TMouseButton;
      Shift: TShiftState; X, Y: Integer);
    procedure bigbtMouseDown(Sender: TObject; Button: TMouseButton;
      Shift: TShiftState; X, Y: Integer);
    procedure smallbtMouseDown(Sender: TObject; Button: TMouseButton;
      Shift: TShiftState; X, Y: Integer);
    procedure movebtMouseUp(Sender: TObject; Button: TMouseButton;
      Shift: TShiftState; X, Y: Integer);
    procedure smallbtMouseUp(Sender: TObject; Button: TMouseButton;
      Shift: TShiftState; X, Y: Integer);
    procedure bigbtMouseUp(Sender: TObject; Button: TMouseButton;
      Shift: TShiftState; X, Y: Integer);
    procedure movebtClick(Sender: TObject);
    procedure bigbtClick(Sender: TObject);
    procedure smallbtClick(Sender: TObject);
    procedure Timer1Timer(Sender: TObject);
    procedure Timer2Timer(Sender: TObject);
    procedure Timer3Timer(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.DFM}

procedure TForm1.exitbtClick(Sender: TObject);
begin
close;
end;

procedure TForm1.FormCreate(Sender: TObject);
begin
timer1.Enabled:=false;
timer2.Enabled:=false;
timer3.Enabled:=false;
image1.Stretch:=true;
end;

procedure TForm1.movebtMouseDown(Sender: TObject; Button: TMouseButton;
  Shift: TShiftState; X, Y: Integer);
begin
timer1.Enabled:=true;
end;

procedure TForm1.bigbtMouseDown(Sender: TObject; Button: TMouseButton;
  Shift: TShiftState; X, Y: Integer);
begin
timer2.Enabled:=true;
end;

procedure TForm1.smallbtMouseDown(Sender: TObject; Button: TMouseButton;
  Shift: TShiftState; X, Y: Integer);
begin
timer3.Enabled:=true;
end;

procedure TForm1.movebtMouseUp(Sender: TObject; Button: TMouseButton;
  Shift: TShiftState; X, Y: Integer);
begin
timer1.Enabled:=false;
end;

procedure TForm1.smallbtMouseUp(Sender: TObject; Button: TMouseButton;
  Shift: TShiftState; X, Y: Integer);
begin
timer3.Enabled:=false;
end;

procedure TForm1.bigbtMouseUp(Sender: TObject; Button: TMouseButton;
  Shift: TShiftState; X, Y: Integer);
begin
timer2.Enabled:=false;
end;

procedure TForm1.movebtClick(Sender: TObject);
begin
timer1.Enabled:=true;
end;

procedure TForm1.bigbtClick(Sender: TObject);
begin
timer2.Enabled:=true;
end;

procedure TForm1.smallbtClick(Sender: TObject);
begin
timer3.Enabled:=true;
end;

procedure TForm1.Timer1Timer(Sender: TObject);
begin
if image1.Left>=form1.Width-image1.Width then
    image1.Left:=0
else
image1.Left:=image1.Left+10;
end;

procedure TForm1.Timer2Timer(Sender: TObject);
begin
image1.Width:=image1.Width+10;
image1.Height:=image1.Height+10;
end;

procedure TForm1.Timer3Timer(Sender: TObject);
begin
if (image1.Width>0) and (image1.height>0) then
begin
image1.Width:=image1.Width-10;
image1.Height:=image1.Height-10;
end;
end;

end.