lightcontrolu.pas

source for card readers

unit LightControlU;

interface

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

type
  TfrmTrafficLight = class(TForm)
    tmrTrafficLight: TTimer;
    lblTrafficLight: TLabel;
    shpRed: TShape;
    shpYellow: TShape;
    shpGreen: TShape;
    procedure tmrTrafficLightTimer(Sender: TObject);
    procedure FormShow(Sender: TObject);
  private
    MyTrafficLight: TTrafficLight;
    FPeriod: integer;
    FState: string;
    FStopLight: TColor;
    FGoLight: TColor;
    FCautionLight: TColor;
    procedure UpDateDisplay;
  public
    property Period: integer read FPeriod write FPeriod;
    property State: string read FState write FState;
    property StopLight: TColor read FStopLight write FStopLight;
    property CautionLight: TColor read FCautionLight write FCautionLight;
    property GoLight: TColor read FGoLight write FGoLight;
  end;

var
  frmTrafficLight: TfrmTrafficLight;

implementation

{$R *.dfm}

procedure TfrmTrafficLight.tmrTrafficLightTimer(Sender: TObject);
begin
  MyTrafficLight.NextState(Self);
  UpDateDisplay;
end;  // end procedure TfrmTrafficLight.tmrTrafficLightTimer

procedure TfrmTrafficLight.FormShow(Sender: TObject);
begin
  MyTrafficLight := TTrafficLight.Create;

  State := 'Caution';
  MyTrafficLight.NextState(Self);
  UpDateDisplay;
  tmrTrafficLight.Enabled := True;
end;  // end procedure TfrmTrafficLight.FormShow

procedure TfrmTrafficLight.UpDateDisplay;
begin
  tmrTrafficLight.Interval := Period;
  lblTrafficLight.Caption := State;
  shpRed.Brush.Color := StopLight;
  shpYellow.Brush.Color := CautionLight;
  shpGreen.Brush.Color := GoLight;
end;  // end procedure TfrmTrafficLight.UpDateDisplay

end.  // end unit LightControlU