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Delphi 4 Bible
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MAIN.PAS
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Pascal/Delphi Source File
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1998-04-04
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1KB
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67 lines
unit Main;
interface
uses
Windows, SysUtils, Messages, Classes, Graphics, Controls,
Forms, Dialogs, ExtCtrls, StdCtrls;
type
TMainForm = class(TForm)
Label1: TLabel;
Label2: TLabel;
Timer1: TTimer;
procedure FormCreate(Sender: TObject);
procedure FormKeyDown(Sender: TObject; var Key: Word;
Shift: TShiftState);
procedure FormKeyUp(Sender: TObject; var Key: Word;
Shift: TShiftState);
procedure Timer1Timer(Sender: TObject);
private
{ Private declarations }
Count: Integer;
KeyPressed: Word;
public
{ Public declarations }
end;
var
MainForm: TMainForm;
implementation
{$R *.DFM}
procedure TMainForm.FormCreate(Sender: TObject);
begin
Count := 0;
end;
procedure TMainForm.FormKeyDown(Sender: TObject; var Key: Word;
Shift: TShiftState);
begin
if ((Key = vk_up) or (Key = vk_down)) then
begin
KeyPressed := Key;
Timer1.Enabled := True;
end;
end;
procedure TMainForm.FormKeyUp(Sender: TObject; var Key: Word;
Shift: TShiftState);
begin
Timer1.Enabled := False;
end;
procedure TMainForm.Timer1Timer(Sender: TObject);
begin
if KeyPressed = vk_up then
Inc(Count)
else if KeyPressed = vk_down then
Dec(Count);
Label1.Caption := IntToStr(Count);
end;
end.