editor.pas

《Kylix程序设计》一书中附带的例程源代码

unit Editor;

interface

uses
  SysUtils, Types, Classes, Variants, QGraphics, QControls, QForms, QDialogs,
  QExtCtrls, QComCtrls, QStdCtrls, QTypes, QMenus, QImgList;

type
  TFrmEditor = class(TForm)
    Memo: TMemo;
    MainMenu: TMainMenu;
    MnuFile: TMenuItem;
    MnuEdit: TMenuItem;
    MnuHelp: TMenuItem;
    MnuItmFileNew: TMenuItem;
    MnuItmFileOpen: TMenuItem;
    N1: TMenuItem;
    MnuItmFileSave: TMenuItem;
    MnuItmFileSaveAs: TMenuItem;
    N2: TMenuItem;
    MnuItmFileExit: TMenuItem;
    MnuItmEditCut: TMenuItem;
    MnuItmEditCopy: TMenuItem;
    MnuItmEditPaste: TMenuItem;
    MnuItmEditDelete: TMenuItem;
    MnuItmEditSelectAll: TMenuItem;
    MnuItmHelpAbout: TMenuItem;
    MnuOptions: TMenuItem;
    MnuItmOptionsFont: TMenuItem;
    MnuSearch: TMenuItem;
    MnuItmSearchFind: TMenuItem;
    MnuItmSearchReplace: TMenuItem;
    FindDialog: TFindDialog;
    ReplaceDialog: TReplaceDialog;
    FontDialog: TFontDialog;
    SaveDialog: TSaveDialog;
    OpenDialog: TOpenDialog;
    StatusBar: TStatusBar;
    ImageList: TImageList;
    ToolBar: TToolBar;
    TolBtnNew: TToolButton;
    TolBtnOpen: TToolButton;
    TolBtnSave: TToolButton;
    TolBtnExit: TToolButton;
    ToolButton5: TToolButton;
    TolBtnCut: TToolButton;
    TolBtnCopy: TToolButton;
    TolBtnPaste: TToolButton;
    ToolButton9: TToolButton;
    TolBtnFind: TToolButton;
    TolBtnReplace: TToolButton;
    ToolButton12: TToolButton;
    TolBtnFont: TToolButton;
    procedure MnuItmFileExitClick(Sender: TObject);
    procedure MnuItmEditCopyClick(Sender: TObject);
    procedure MnuItmEditCutClick(Sender: TObject);
    procedure MnuItmEditPasteClick(Sender: TObject);
    procedure MnuItmEditDeleteClick(Sender: TObject);
    procedure MnuItmEditSelectAllClick(Sender: TObject);
    procedure MnuItmOptionsFontClick(Sender: TObject);
    procedure MnuItmSearchFindClick(Sender: TObject);
    procedure MnuItmSearchReplaceClick(Sender: TObject);
    procedure MnuItmFileNewClick(Sender: TObject);
    procedure MnuItmFileOpenClick(Sender: TObject);
    procedure MnuItmFileSaveClick(Sender: TObject);
    procedure MnuItmFileSaveAsClick(Sender: TObject);
    procedure FormCreate(Sender: TObject);
    procedure FormCloseQuery(Sender: TObject; var CanClose: Boolean);
    procedure FindDialogFind(Sender: TObject);
    procedure ReplaceDialogFind(Sender: TObject);
    procedure ReplaceDialogReplace(Sender: TObject);
    procedure MnuItmHelpAboutClick(Sender: TObject);
  private
    { Private declarations }
    FFileName: string;
    FCaptionDef: string;
  public
    { Public declarations }
    function GetFileName(): string;
  end;

var
  FrmEditor: TFrmEditor;

implementation

uses About, Splash;

{$R *.xfm}

procedure TFrmEditor.MnuItmFileExitClick(Sender: TObject);
begin
  Close();
end;

procedure TFrmEditor.MnuItmEditCopyClick(Sender: TObject);
begin
  Memo.CopyToClipboard();
end;

procedure TFrmEditor.MnuItmEditCutClick(Sender: TObject);
begin
  Memo.CutToClipboard();
end;

procedure TFrmEditor.MnuItmEditPasteClick(Sender: TObject);
begin
  Memo.PasteFromClipboard();
end;

procedure TFrmEditor.MnuItmEditDeleteClick(Sender: TObject);
begin
  Memo.ClearSelection();
end;

procedure TFrmEditor.MnuItmEditSelectAllClick(Sender: TObject);
begin
  Memo.SelectAll();
end;

procedure TFrmEditor.MnuItmOptionsFontClick(Sender: TObject);
begin
  FontDialog.Font.Assign( Memo.Font );
  if FontDialog.Execute() then
    Memo.Font.Assign( FontDialog.Font );
end;

procedure TFrmEditor.MnuItmSearchFindClick(Sender: TObject);
begin
  FindDialog.Execute();
end;

procedure TFrmEditor.MnuItmSearchReplaceClick(Sender: TObject);
begin
  ReplaceDialog.Execute();
end;

procedure TFrmEditor.MnuItmFileNewClick(Sender: TObject);
begin
  FFileName := 'Untitle.txt';
  Caption := FCaptionDef + ': ' + FFileName;
  Memo.Clear();
end;

function TFrmEditor.GetFileName: string;
begin
  Result := FFileName;
end;

procedure TFrmEditor.MnuItmFileOpenClick(Sender: TObject);
begin
  if OpenDialog.Execute() then
  begin
    FFileName := OpenDialog.FileName;
    Caption := FCaptionDef + ': ' + FFileName;
    Memo.Clear();
    Memo.Lines.LoadFromFile( FFileName );
    Memo.SetFocus();
    Memo.Modified := false;
    Memo.ReadOnly := false;
  end;
end;

procedure TFrmEditor.MnuItmFileSaveClick(Sender: TObject);
begin
  if Pos( 'Untitle', FFileName ) <> 0 then
    MnuItmFileSaveAsClick( Sender )
  else
  begin
    Memo.Lines.SaveToFile( FFileName );
    Memo.Modified := false;
  end;
end;

procedure TFrmEditor.MnuItmFileSaveAsClick(Sender: TObject);
begin
  SaveDialog.Title := 'Save As...';
  if SaveDialog.Execute() then
  begin
    Memo.Lines.SaveToFile( FFileName );
    FFileName := SaveDialog.FileName;
    Caption := FCaptionDef + ': ' + FFileName;
    Memo.Modified := false;
  end;
end;

procedure TFrmEditor.FormCreate(Sender: TObject);
{
var
  i: Integer;
  FrmSplash: TFrmSplash;
}
begin
  FCaptionDef := 'Text Editor';
  FFileName := 'Untitle.txt';
  Caption := FCaptionDef + ': ' + FFileName;
{
  FrmSplash := TFrmSplash.Create( Application );
//  FrmSplash.FormStyle := fsStayOnTop;
  FrmSplash.Show();
  FrmSplash.Update();
  FrmSplash.TimerDelay.Enabled := true;
}
end;

procedure TFrmEditor.FormCloseQuery(Sender: TObject;
  var CanClose: Boolean);
var
  ReturnBtn: TMessageButton;
begin
  if Memo.Modified then
  begin
    ReturnBtn := Application.MessageBox(
      'File has been modified. Save it?',
      'Warning',
      [ smbYes, smbNo, smbCancel ],
      smsWarning,
      smbYes,
      smbCancel );
    if ReturnBtn = smbYes then
    begin
      MnuItmFileSaveClick( Sender );
      exit;
    end;
    if ReturnBtn = smbNo then
    begin
      exit;
    end;
    if ReturnBtn = smbCancel then
    begin
      CanClose := false;
    end;
  end;
end;

procedure TFrmEditor.FindDialogFind(Sender: TObject);
var
  i, j: Integer;
  PosReturn, SkipChars: Integer;
begin
  for i := 0 to Memo.Lines.Count do
  begin
    PosReturn := Pos( FindDialog.FindText, Memo.Lines[ i ] );
    if PosReturn <> 0 then
    begin
      SkipChars := 0;
      for j := 0 to i - 1 do
      begin
        SkipChars := SkipChars + Length( Memo.Lines[ i ] );
      end;
      SkipChars := SkipChars + ( i * 2 );
      SkipChars := SkipChars + PosReturn - 1;
      Memo.SetFocus();
      Memo.SelStart := SkipChars;
      Memo.SelLength := Length( FindDialog.FindText );
      break;
    end;
  end;
end;

procedure TFrmEditor.ReplaceDialogFind(Sender: TObject);
var
  i, j: Integer;
  PosReturn, SkipChars: Integer;
begin
  for i := 0 to Memo.Lines.Count do
  begin
    PosReturn := Pos( ReplaceDialog.FindText, Memo.Lines[ i ] );
    if PosReturn <> 0 then
    begin
      SkipChars := 0;
      for j := 0 to i - 1 do
      begin
        SkipChars := SkipChars + Length( Memo.Lines[ i ] );
      end;
      SkipChars := SkipChars + ( i * 2 );
      SkipChars := SkipChars + PosReturn - 1;
      Memo.SetFocus();
      Memo.SelStart := SkipChars;
      Memo.SelLength := Length( ReplaceDialog.FindText );
      break;
    end;
  end;
end;

procedure TFrmEditor.ReplaceDialogReplace(Sender: TObject);
begin
  Memo.SelText := ReplaceDialog.ReplaceText;
end;

procedure TFrmEditor.MnuItmHelpAboutClick(Sender: TObject);
var
  AboutBox: TAboutBox;
begin
  AboutBox := TAboutBox.Create( Application );
  try
    ABoutBox.ShowModal();
  finally
    AboutBox.Free();
    AboutBox := nil;
  end;
end;

end.