[rauros]

Bueno, me voy. Luego vuelvo. Os dejo el código de lo que he conseguido hasta ahora.

Objetos:

Código Delphi [-]
object Form1: TForm1
  Left = 302
  Top = 239
  Width = 676
  Height = 426
  Caption = 'Editor de texto'
  Color = clBtnFace
  Font.Charset = DEFAULT_CHARSET
  Font.Color = clWindowText
  Font.Height = -11
  Font.Name = 'MS Sans Serif'
  Font.Style = []
  Menu = MainMenu1
  OldCreateOrder = False
  OnCanResize = FormResize
  OnClose = FormClose
  PixelsPerInch = 96
  TextHeight = 13
  object RichEdit: TRichEdit
    Left = 0
    Top = 0
    Width = 665
    Height = 353
    TabOrder = 0
    OnChange = RichChange
  end
  object StatusBar1: TStatusBar
    Left = 0
    Top = 353
    Width = 668
    Height = 19
    Panels = <
      item
        Width = 50
      end
      item
        Text = 'Escribe arriba lo que desees.'
        Width = 50
      end>
  end
  object SaveDialog1: TSaveDialog
    DefaultExt = 'txt'
    FileName = 'prueba'
    Filter = 'Archivos de texto|*.txt|Scripts|*.scp'
    Left = 32
    Top = 40
  end
  object MainMenu1: TMainMenu
    Left = 72
    Top = 40
    object N1: TMenuItem
      Caption = 'Archivo'
      Default = True
      object Guardar1: TMenuItem
        Caption = 'Guardar'
        OnClick = Guardar1Click
      end
    end
  end
end

Programa:

Código Delphi [-]
program edittxt;

uses
  Forms,
  editortextos in 'editortextos.pas' {Form1};

{$R *.res}

begin
  Application.Initialize;
  Application.CreateForm(TForm1, Form1);
  Application.Run;
end.

Unidad:

Código Delphi [-]
unit editortextos;

interface

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

type
  TForm1 = class(TForm)
    RichEdit: TRichEdit;
    StatusBar1: TStatusBar;
    SaveDialog1: TSaveDialog;
    MainMenu1: TMainMenu;
    N1: TMenuItem;
    Guardar1: TMenuItem;
    procedure FormResize(Sender: TObject; var NewWidth, NewHeight: Integer;
      var Resize: Boolean);
    procedure FormClose(Sender: TObject; var Action: TCloseAction);
    procedure Guardar1Click(Sender: TObject);
    procedure RichChange(Sender: TObject);
  private
    { Private declarations }
  public
    { Public declarations }
  end;

var
  Form1: TForm1;
  cambiado: boolean;

implementation

{$R *.dfm}

procedure TForm1.FormResize(Sender: TObject; var NewWidth,
  NewHeight: Integer; var Resize: Boolean);
begin
RichEdit.Width:=form1.Width - 9 ;
RichEdit.Height:=form1.height - 73
end;

procedure TForm1.FormClose(Sender: TObject; var Action: TCloseAction);
begin
if cambiado = true then
form1.SaveDialog1.Execute;
end;

procedure TForm1.Guardar1Click(Sender: TObject);
begin
 //  if SaveDialog1.Execute then begin
 //   RichEdit1.SaveToFile(SaveDialog1.FileName);
 // end;
  Showmessage('Próximamente jaj');
end;

procedure TForm1.RichChange(Sender: TObject);
begin
cambiado:=true
end;

end.