unit REMain;

interface

uses
  SysUtils, Windows, Messages, Classes, Graphics, Controls,
  Forms, Dialogs, StdCtrls, Buttons, ExtCtrls, Menus, ComCtrls, ClipBrd,
  ToolWin, ActnList, ImgList;

type
  TMainForm = class(TForm)
    MainMenu: TMainMenu;
    FileNewItem: TMenuItem;
    FileOpenItem: TMenuItem;
    FileSaveItem: TMenuItem;
    FileSaveAsItem: TMenuItem;
    FilePrintItem: TMenuItem;
    FileExitItem: TMenuItem;
    EditUndoItem: TMenuItem;
    EditCutItem: TMenuItem;
    EditCopyItem: TMenuItem;
    EditPasteItem: TMenuItem;
    HelpAboutItem: TMenuItem;
    OpenDialog: TOpenDialog;
    SaveDialog: TSaveDialog;
    PrintDialog: TPrintDialog;
    Ruler: TPanel;
    FontDialog1: TFontDialog;
    FirstInd: TLabel;
    LeftInd: TLabel;
    RulerLine: TBevel;
    RightInd: TLabel;
    N5: TMenuItem;
    miEditFont: TMenuItem;
    Editor: TRichEdit;
    StatusBar: TStatusBar;
    StandardToolBar: TToolBar;
    OpenButton: TToolButton;
    SaveButton: TToolButton;
    PrintButton: TToolButton;
    ToolButton5: TToolButton;
    UndoButton: TToolButton;
    CutButton: TToolButton;
    CopyButton: TToolButton;
    PasteButton: TToolButton;
    ToolButton10: TToolButton;
    FontName: TComboBox;
    FontSize: TEdit;
    ToolButton11: TToolButton;
    UpDown1: TUpDown;
    BoldButton: TToolButton;
    ItalicButton: TToolButton;
    UnderlineButton: TToolButton;
    ToolButton16: TToolButton;
    LeftAlign: TToolButton;
    CenterAlign: TToolButton;
    RightAlign: TToolButton;
    ToolButton20: TToolButton;
    BulletsButton: TToolButton;
    ToolbarImages: TImageList;
    ActionList1: TActionList;
    FileNewCmd: TAction;
    FileOpenCmd: TAction;
    FileSaveCmd: TAction;
    FilePrintCmd: TAction;
    FileExitCmd: TAction;
    ToolButton1: TToolButton;
    ToolButton2: TToolButton;
    Bevel1: TBevel;
    LanguageMenu: TMenuItem;
    LanguageEnglish: TMenuItem;
    LanguageGerman: TMenuItem;
    EditCutCmd: TAction;
    EditCopyCmd: TAction;
    EditPasteCmd: TAction;
    EditUndoCmd: TAction;
    EditFontCmd: TAction;
    FileSaveAsCmd: TAction;
    LanguageFrench: TMenuItem;

    procedure SelectionChange(Sender: TObject);
    procedure FormCreate(Sender: TObject);
    procedure ShowHint(Sender: TObject);
    procedure FileNew(Sender: TObject);
    procedure FileOpen(Sender: TObject);
    procedure FileSave(Sender: TObject);
    procedure FileSaveAs(Sender: TObject);
    procedure FilePrint(Sender: TObject);
    procedure FileExit(Sender: TObject);
    procedure EditUndo(Sender: TObject);
    procedure EditCut(Sender: TObject);
    procedure EditCopy(Sender: TObject);
    procedure EditPaste(Sender: TObject);
    procedure HelpAbout(Sender: TObject);
    procedure SelectFont(Sender: TObject);
    procedure RulerResize(Sender: TObject);
    procedure FormResize(Sender: TObject);
    procedure FormPaint(Sender: TObject);
    procedure BoldButtonClick(Sender: TObject);
    procedure ItalicButtonClick(Sender: TObject);
    procedure FontSizeChange(Sender: TObject);
    procedure AlignButtonClick(Sender: TObject);
    procedure FontNameChange(Sender: TObject);
    procedure UnderlineButtonClick(Sender: TObject);
    procedure BulletsButtonClick(Sender: TObject);
    procedure FormCloseQuery(Sender: TObject; var CanClose: Boolean);
    procedure RulerItemMouseDown(Sender: TObject; Button: TMouseButton;
      Shift: TShiftState; X, Y: Integer);
    procedure RulerItemMouseMove(Sender: TObject; Shift: TShiftState; X,
      Y: Integer);
    procedure FirstIndMouseUp(Sender: TObject; Button: TMouseButton;
      Shift: TShiftState; X, Y: Integer);
    procedure LeftIndMouseUp(Sender: TObject; Button: TMouseButton;
      Shift: TShiftState; X, Y: Integer);
    procedure RightIndMouseUp(Sender: TObject; Button: TMouseButton;
      Shift: TShiftState; X, Y: Integer);
    procedure FormShow(Sender: TObject);
    procedure RichEditChange(Sender: TObject);
    procedure SwitchLanguage(Sender: TObject);
    procedure ActionList2Update(Action: TBasicAction;
      var Handled: Boolean);
  private
    FFileName: string;
    FUpdating: Boolean;
    FDragOfs: Integer;
    FDragging: Boolean;
    function CurrText: TTextAttributes;
    procedure GetFontNames;
    procedure SetFileName(const FileName: String);
    procedure CheckFileSave;
    procedure SetupRuler;
    procedure SetEditRect;
    procedure UpdateCursorPos;
    procedure WMDropFiles(var Msg: TWMDropFiles); message WM_DROPFILES;
    procedure PerformFileOpen(const AFileName: string);
    procedure SetModified(Value: Boolean);
  end;

var
  MainForm: TMainForm;

implementation

uses REAbout, RichEdit, ShellAPI, ReInit;

resourcestring
  sSaveChanges = 'Save changes to %s?';
  sOverWrite = 'OK to overwrite %s';
  sUntitled = 'Untitled';
  sModified = 'Modified';
  sColRowInfo = 'Line: %3d   Col: %3d';

const
  RulerAdj = 4/3;
  GutterWid = 6;

  ENGLISH = (SUBLANG_ENGLISH_US shl 10) or LANG_ENGLISH;
  FRENCH  = (SUBLANG_FRENCH shl 10) or LANG_FRENCH;
  GERMAN  = (SUBLANG_GERMAN shl 10) or LANG_GERMAN;

{$R *.DFM}

procedure TMainForm.SelectionChange(Sender: TObject);
begin
  with Editor.Paragraph do
  try
    FUpdating := True;
    FirstInd.Left := Trunc(FirstIndent*RulerAdj)-4+GutterWid;
    LeftInd.Left := Trunc((LeftIndent+FirstIndent)*RulerAdj)-4+GutterWid;
    RightInd.Left := Ruler.ClientWidth-6-Trunc((RightIndent+GutterWid)*RulerAdj);
    BoldButton.Down := fsBold in Editor.SelAttributes.Style;
    ItalicButton.Down := fsItalic in Editor.SelAttributes.Style;
    UnderlineButton.Down := fsUnderline in Editor.SelAttributes.Style;
    BulletsButton.Down := Boolean(Numbering);
    FontSize.Text := IntToStr(Editor.SelAttributes.Size);
    FontName.Text := Editor.SelAttributes.Name;
    case Ord(Alignment) of
      0: LeftAlign.Down := True;
      1: RightAlign.Down := True;
      2: CenterAlign.Down := True;
    end;
    UpdateCursorPos;
  finally
    FUpdating := False;
  end;
end;

function TMainForm.CurrText: TTextAttributes;
begin
  if Editor.SelLength > 0 then Result := Editor.SelAttributes
  else Result := Editor.DefAttributes;
end;

function EnumFontsProc(var LogFont: TLogFont; var TextMetric: TTextMetric;
  FontType: Integer; Data: Pointer): Integer; stdcall;
begin
  TStrings(Data).Add(LogFont.lfFaceName);
  Result := 1;
end;

procedure TMainForm.GetFontNames;
var
  DC: HDC;
begin
  DC := GetDC(0);
  EnumFonts(DC, nil, @EnumFontsProc, Pointer(FontName.Items));
  ReleaseDC(0, DC);
  FontName.Sorted := True;
end;

procedure TMainForm.SetFileName(const FileName: String);
begin
  FFileName := FileName;
  Caption := Format('%s - %s', [ExtractFileName(FileName), Application.Title]);
end;

procedure TMainForm.CheckFileSave;
var
  SaveResp: Integer;
begin
  if not Editor.Modified then Exit;
  SaveResp := MessageDlg(Format(sSaveChanges, [FFileName]),
    mtConfirmation, mbYesNoCancel, 0);
  case SaveResp of
    idYes: FileSave(Self);
    idNo: {Nothing};
    idCancel: Abort;
  end;
end;

procedure TMainForm.SetupRuler;
var
  I: Integer;
  S: String;
begin
  SetLength(S, 201);
  I := 1;
  while I < 200 do
  begin
    S[I] := #9;
    S[I+1] := '|';
    Inc(I, 2);
  end;
  Ruler.Caption := S;
end;

procedure TMainForm.SetEditRect;
var
  R: TRect;
begin
  with Editor do
  begin
    R := Rect(GutterWid, 0, ClientWidth-GutterWid, ClientHeight);
    SendMessage(Handle, EM_SETRECT, 0, Longint(@R));
  end;
end;

{ Event Handlers }

procedure TMainForm.FormCreate(Sender: TObject);
begin
  Application.OnHint := ShowHint;
  OpenDialog.InitialDir := ExtractFilePath(ParamStr(0));
  SaveDialog.InitialDir := OpenDialog.InitialDir;
  SetFileName(sUntitled);
  GetFontNames;
  SetupRuler;
  SelectionChange(Self);

  CurrText.Name := DefFontData.Name;
  CurrText.Size := -MulDiv(DefFontData.Height, 72, Screen.PixelsPerInch);

  LanguageEnglish.Tag := ENGLISH;
  LanguageFrench.Tag := FRENCH;
  LanguageGerman.Tag := GERMAN;
  case SysLocale.DefaultLCID of
    ENGLISH: SwitchLanguage(LanguageEnglish);
    FRENCH: SwitchLanguage(LanguageFrench);
    GERMAN: SwitchLanguage(LanguageGerman);
  end;
end;

procedure TMainForm.ShowHint(Sender: TObject);
begin
  if Length(Application.Hint) > 0 then
  begin
    StatusBar.SimplePanel := True;
    StatusBar.SimpleText := Application.Hint;
  end
  else StatusBar.SimplePanel := False;
end;

procedure TMainForm.FileNew(Sender: TObject);
begin
  SetFileName(sUntitled);
  Editor.Lines.Clear;
  Editor.Modified := False;
  SetModified(False);
end;

procedure TMainForm.PerformFileOpen(const AFileName: string);
begin