Editor.Lines.LoadFromFile(AFileName);
  SetFileName(AFileName);
  Editor.SetFocus;
  Editor.Modified := False;
  SetModified(False);
end;

procedure TMainForm.FileOpen(Sender: TObject);
begin
  CheckFileSave;
  if OpenDialog.Execute then
  begin
    PerformFileOpen(OpenDialog.FileName);
    Editor.ReadOnly := ofReadOnly in OpenDialog.Options;
  end;
end;

procedure TMainForm.FileSave(Sender: TObject);
begin
  if FFileName = sUntitled then
    FileSaveAs(Sender)
  else
  begin
    Editor.Lines.SaveToFile(FFileName);
    Editor.Modified := False;
    SetModified(False);
  end;
end;

procedure TMainForm.FileSaveAs(Sender: TObject);
begin
  if SaveDialog.Execute then
  begin
    if FileExists(SaveDialog.FileName) then
      if MessageDlg(Format(sOverWrite, [SaveDialog.FileName]),
        mtConfirmation, mbYesNoCancel, 0) <> idYes then Exit;
    Editor.Lines.SaveToFile(SaveDialog.FileName);
    SetFileName(SaveDialog.FileName);
    Editor.Modified := False;
    SetModified(False);
  end;
end;

procedure TMainForm.FilePrint(Sender: TObject);
begin
  if PrintDialog.Execute then
    Editor.Print(FFileName);
end;

procedure TMainForm.FileExit(Sender: TObject);
begin
  Close;
end;

procedure TMainForm.EditUndo(Sender: TObject);
begin
  with Editor do
    if HandleAllocated then SendMessage(Handle, EM_UNDO, 0, 0);
end;

procedure TMainForm.EditCut(Sender: TObject);
begin
  Editor.CutToClipboard;
end;

procedure TMainForm.EditCopy(Sender: TObject);
begin
  Editor.CopyToClipboard;
end;

procedure TMainForm.EditPaste(Sender: TObject);
begin
  Editor.PasteFromClipboard;
end;

procedure TMainForm.HelpAbout(Sender: TObject);
begin
  with TAboutBox.Create(Self) do
  try
    ShowModal;
  finally
    Free;
  end;
end;

procedure TMainForm.SelectFont(Sender: TObject);
begin
  FontDialog1.Font.Assign(Editor.SelAttributes);
  if FontDialog1.Execute then
    CurrText.Assign(FontDialog1.Font);
  SelectionChange(Self);
  Editor.SetFocus;
end;

procedure TMainForm.RulerResize(Sender: TObject);
begin
  RulerLine.Width := Ruler.ClientWidth - (RulerLine.Left*2);
end;

procedure TMainForm.FormResize(Sender: TObject);
begin
  SetEditRect;
  SelectionChange(Sender);
end;

procedure TMainForm.FormPaint(Sender: TObject);
begin
  SetEditRect;
end;

procedure TMainForm.BoldButtonClick(Sender: TObject);
begin
  if FUpdating then Exit;
  if BoldButton.Down then
    CurrText.Style := CurrText.Style + [fsBold]
  else
    CurrText.Style := CurrText.Style - [fsBold];
end;

procedure TMainForm.ItalicButtonClick(Sender: TObject);
begin
  if FUpdating then Exit;
  if ItalicButton.Down then
    CurrText.Style := CurrText.Style + [fsItalic]
  else
    CurrText.Style := CurrText.Style - [fsItalic];
end;

procedure TMainForm.FontSizeChange(Sender: TObject);
begin
  if FUpdating then Exit;
  CurrText.Size := StrToInt(FontSize.Text);
end;

procedure TMainForm.AlignButtonClick(Sender: TObject);
begin
  if FUpdating then Exit;
  Editor.Paragraph.Alignment := TAlignment(TControl(Sender).Tag);
end;

procedure TMainForm.FontNameChange(Sender: TObject);
begin
  if FUpdating then Exit;
  CurrText.Name := FontName.Items[FontName.ItemIndex];
end;

procedure TMainForm.UnderlineButtonClick(Sender: TObject);
begin
  if FUpdating then Exit;
  if UnderlineButton.Down then
    CurrText.Style := CurrText.Style + [fsUnderline]
  else
    CurrText.Style := CurrText.Style - [fsUnderline];
end;

procedure TMainForm.BulletsButtonClick(Sender: TObject);
begin
  if FUpdating then Exit;
  Editor.Paragraph.Numbering := TNumberingStyle(BulletsButton.Down);
end;

procedure TMainForm.FormCloseQuery(Sender: TObject; var CanClose: Boolean);
begin
  try
    CheckFileSave;
  except
    CanClose := False;
  end;
end;

{ Ruler Indent Dragging }

procedure TMainForm.RulerItemMouseDown(Sender: TObject; Button: TMouseButton;
  Shift: TShiftState; X, Y: Integer);
begin
  FDragOfs := (TLabel(Sender).Width div 2);
  TLabel(Sender).Left := TLabel(Sender).Left+X-FDragOfs;
  FDragging := True;
end;

procedure TMainForm.RulerItemMouseMove(Sender: TObject; Shift: TShiftState;
  X, Y: Integer);
begin
  if FDragging then
    TLabel(Sender).Left :=  TLabel(Sender).Left+X-FDragOfs
end;

procedure TMainForm.FirstIndMouseUp(Sender: TObject; Button: TMouseButton;
  Shift: TShiftState; X, Y: Integer);
begin
  FDragging := False;
  Editor.Paragraph.FirstIndent := Trunc((FirstInd.Left+FDragOfs-GutterWid) / RulerAdj);
  LeftIndMouseUp(Sender, Button, Shift, X, Y);
end;

procedure TMainForm.LeftIndMouseUp(Sender: TObject; Button: TMouseButton;
  Shift: TShiftState; X, Y: Integer);
begin
  FDragging := False;
  Editor.Paragraph.LeftIndent := Trunc((LeftInd.Left+FDragOfs-GutterWid) / RulerAdj)-Editor.Paragraph.FirstIndent;
  SelectionChange(Sender);
end;

procedure TMainForm.RightIndMouseUp(Sender: TObject; Button: TMouseButton;
  Shift: TShiftState; X, Y: Integer);
begin
  FDragging := False;
  Editor.Paragraph.RightIndent := Trunc((Ruler.ClientWidth-RightInd.Left+FDragOfs-2) / RulerAdj)-2*GutterWid;
  SelectionChange(Sender);
end;

procedure TMainForm.UpdateCursorPos;
var
  CharPos: TPoint;
begin
  CharPos.Y := SendMessage(Editor.Handle, EM_EXLINEFROMCHAR, 0,
    Editor.SelStart);
  CharPos.X := (Editor.SelStart -
    SendMessage(Editor.Handle, EM_LINEINDEX, CharPos.Y, 0));
  Inc(CharPos.Y);
  Inc(CharPos.X);
  StatusBar.Panels[0].Text := Format(sColRowInfo, [CharPos.Y, CharPos.X]);
end;

procedure TMainForm.FormShow(Sender: TObject);
begin
  UpdateCursorPos;
  DragAcceptFiles(Handle, True);
  RichEditChange(nil);
  Editor.SetFocus;
  { Check if we should load a file from the command line }
  if (ParamCount > 0) and FileExists(ParamStr(1)) then
    PerformFileOpen(ParamStr(1));
end;

procedure TMainForm.WMDropFiles(var Msg: TWMDropFiles);
var
  CFileName: array[0..MAX_PATH] of Char;
begin
  try
    if DragQueryFile(Msg.Drop, 0, CFileName, MAX_PATH) > 0 then
    begin
      CheckFileSave;
      PerformFileOpen(CFileName);
      Msg.Result := 0;
    end;
  finally
    DragFinish(Msg.Drop);
  end;
end;

procedure TMainForm.RichEditChange(Sender: TObject);
begin
  SetModified(Editor.Modified);
end;

procedure TMainForm.SetModified(Value: Boolean);
begin
  if Value then StatusBar.Panels[1].Text := sModified
  else StatusBar.Panels[1].Text := '';
end;

procedure TMainForm.SwitchLanguage(Sender: TObject);
var
  Name : String;
  Size : Integer;
begin
  if LoadNewResourceModule(TComponent(Sender).Tag) <> 0 then
  begin
    Name := FontName.Text;
    Size := StrToInt(FontSize.Text);
    ReinitializeForms;
    LanguageEnglish.Checked := LanguageEnglish = Sender;
    LanguageFrench.Checked  := LanguageFrench  = Sender;
    LanguageGerman.Checked  := LanguageGerman  = Sender;

    CurrText.Name := Name;
    CurrText.Size := Size;
    SelectionChange(Self);
    FontName.SelLength := 0;

    SetupRuler;
    if Visible then Editor.SetFocus;
  end;
end;

procedure TMainForm.ActionList2Update(Action: TBasicAction;
  var Handled: Boolean);
begin
 { Update the status of the edit commands }
  EditCutCmd.Enabled := Editor.SelLength > 0;
  EditCopyCmd.Enabled := EditCutCmd.Enabled;
  if Editor.HandleAllocated then
  begin
    EditUndoCmd.Enabled := Editor.Perform(EM_CANUNDO, 0, 0) <> 0;
    EditPasteCmd.Enabled := Editor.Perform(EM_CANPASTE, 0, 0) <> 0;
  end;
end;

end.