unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    btn1: TButton;
    Edit1: TEdit;
    Button1: TButton;
    Label1: TLabel;
    Memo1: TMemo;
    CheckBox1: TCheckBox;
    ComboBox1: TComboBox;
    Label2: TLabel;
    Panel1: TPanel;
    Label3: TLabel;
    Label4: TLabel;
    Label5: TLabel;
    procedure btn1Click(Sender: TObject);
    procedure Button1Click(Sender: TObject);
    procedure Edit1KeyUp(Sender: TObject; var Key: Word;
      Shift: TShiftState);
    procedure CheckBox1Click(Sender: TObject);
    procedure ComboBox1Change(Sender: TObject);
    procedure Memo1Click(Sender: TObject);
    procedure Memo1KeyUp(Sender: TObject; var Key: Word;
      Shift: TShiftState);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;

implementation

{$R *.dfm}

procedure TForm1.btn1Click(Sender: TObject);
begin
  showmessage('Hello World!');
end;

procedure TForm1.Button1Click(Sender: TObject);
begin
  if(Edit1.Text<>'')
  then
  begin
    showmessage(Edit1.Text);
    Edit1.Text := '';
  end;
end;

procedure TForm1.Edit1KeyUp(Sender: TObject; var Key: Word;
  Shift: TShiftState);
begin
  if (Key = VK_RETURN) then
  begin
    Memo1.Lines.Add(Edit1.Text);
    Edit1.Text := '';
  end;
end;

procedure TForm1.CheckBox1Click(Sender: TObject);
begin
  Memo1.ReadOnly := not CheckBox1.Checked;
end;

procedure TForm1.ComboBox1Change(Sender: TObject);
begin
  case ComboBox1.ItemIndex of
    0 : Memo1.Alignment := taLeftJustify;
    1 : Memo1.Alignment := taRightJustify;
    2 : Memo1.Alignment := taCenter;
  end;
end;

procedure TForm1.Memo1Click(Sender: TObject);
begin
  Label3.Caption := 'Označený text: ' + Memo1.SelText;
  Label4.Caption := 'Začátek označení: ' + IntToStr(Memo1.SelStart);
  Label5.Caption := 'Počet znaků označení:' + IntToStr(Memo1.SelLength);
end;

procedure TForm1.Memo1KeyUp(Sender: TObject; var Key: Word;
  Shift: TShiftState);
begin
  Memo1.OnClick(self);
end;

end.