lazarus-ccr/components/lazbarcodes/examples/qrclock/main.pas

unit main;

{$mode objfpc}{$H+}

interface

uses
  Classes, SysUtils, Forms, Controls, Graphics, Dialogs, ExtCtrls, ubarcodes;

type
  
  { TMainForm }

  TMainForm = class(TForm)
    Timer: TTimer;
    procedure FormCreate(Sender: TObject);
    procedure TimerTimer(Sender: TObject);
  private
    BarcodeQR: TBarcodeQR;
    function GetNowText: String;

  public

  end;

var
  MainForm: TMainForm;

implementation

{$R *.lfm}

{ TMainForm }

procedure TMainForm.TimerTimer(Sender: TObject);
begin           
  BarcodeQR.Text := GetNowText;
  Caption := 'QRClock: ' + StringReplace(BarcodeQR.Text, LineEnding, ' - ', []);
end;

procedure TMainForm.FormCreate(Sender: TObject);
var
  w: Integer = 0;
  h: Integer = 0;
begin
  BarcodeQR := TBarcodeQR.Create(self);
  BarcodeQR.Parent := self;
  BarcodeQR.Scale := 16;
  BarcodeQR.Text := GetNowText;
  BarcodeQR.GetPreferredSize(w, h);
  BarcodeQR.SetBounds(0, 0, w, h);
  ClientWidth := w;
  ClientHeight := h;
end;

function TMainForm.GetNowText: String;
var
  dt: TDateTime;
  sd, st: String;
begin           
  dt := Now();
  sd := FormatDateTime('dddddd', dt);
  st := FormatDateTime('hh:nn:ss', dt);
  Result := sd + LineEnding + st;
end;

end.