unit sbRichEdit50;

interface

uses
  Winapi.Windows, Winapi.RichEdit, System.Classes, Vcl.Controls,
  Vcl.StdCtrls, Vcl.ComCtrls;

type
  TRichEdit50 = class(TCustomRichEdit)
  private
    FMSFTLoaded: Boolean;
  public
    procedure CreateParams(var Params: TCreateParams); override;
    property MSFTLoaded: Boolean read FMSFTLoaded;
    {$REGION ' Publishing properties '}
    property Align;
    property Alignment;
    property Anchors;
    property BevelEdges;
    property BevelInner;
    property BevelOuter;
    property BevelKind default bkNone;
    property BevelWidth;
    property BiDiMode;
    property BorderStyle;
    property BorderWidth;
    property Color;
    property Ctl3D;
    property DragCursor;
    property DragKind;
    property DragMode;
    property Enabled;
    property Font;
    property HideSelection;
    property HideScrollBars;
    property ImeMode;
    property ImeName;
    property Constraints;
    property Lines;
    property MaxLength;
    property ParentBiDiMode;
    property ParentColor;
    property ParentCtl3D;
    property ParentFont;
    property ParentShowHint;
    property PlainText;
    property PopupMenu;
    property ReadOnly;
    property ScrollBars;
    property ShowHint;
    property TabOrder;
    property TabStop default True;
    property Touch;
    property Visible;
    property WantTabs;
    property WantReturns;
    property WordWrap;
    property OnChange;
    property OnClick;
    property OnContextPopup;
    property OnDblClick;
    property OnDragDrop;
    property OnDragOver;
    property OnEndDock;
    property OnEndDrag;
    property OnEnter;
    property OnExit;
    property OnGesture;
    property OnKeyDown;
    property OnKeyPress;
    property OnKeyUp;
    property OnMouseActivate;
    property OnMouseDown;
    property OnMouseEnter;
    property OnMouseLeave;
    property OnMouseMove;
    property OnMouseUp;
    property OnMouseWheel;
    property OnMouseWheelDown;
    property OnMouseWheelUp;
    property OnProtectChange;
    property OnResizeRequest;
    property OnSaveClipboard;
    property OnSelectionChange;
    property OnStartDock;
    property OnStartDrag;
    {$ENDREGION}
  end;

procedure Register;

implementation

const
  MSFTModuleName = 'MSFTEDIT.DLL';

var
  FMSFTEditModule: THandle = 0;

{ TRichEdit50 }

procedure TRichEdit50.CreateParams(var Params: TCreateParams);
type
  TInheritedCreateParams = procedure (var Params: TCreateParams) of object;
const
  HideScrollBars: array[Boolean] of DWORD = (ES_DISABLENOSCROLL, 0);
  HideSelections: array[Boolean] of DWORD = (ES_NOHIDESEL, 0);
  RichEditClassName = 'RICHEDIT50W';
var
  InheritedCreateParams: TInheritedCreateParams;
begin
  // trying to load msftefit.dll
  if FMSFTEditModule = 0 then begin
    FMSFTEditModule := LoadLibrary(MSFTModuleName);
    if FMSFTEditModule <= HINSTANCE_ERROR then
      FMSFTEditModule := 0;
  end;
  FMSFTLoaded := FMSFTEditModule <> 0;
  // if not - reverting to default richedit 2.0
  if not FMSFTLoaded then
    inherited CreateParams(Params)
  else begin // else overriding TCustomRichEdit.CreateParams() with new ClassName
    TMethod(InheritedCreateParams).Code := @TCustomMemo.CreateParams;
    TMethod(InheritedCreateParams).Data := Self;
    InheritedCreateParams(Params); // inherited inherited CreateParams(Params);
    CreateSubClass(Params, RichEditClassName);
    with Params do begin
      Style := Style or HideScrollBars[Self.HideScrollBars] or
        HideSelections[HideSelection];
      WindowClass.style := WindowClass.style and not (CS_HREDRAW or CS_VREDRAW);
    end;
  end;
end;

procedure Register;
begin
  RegisterComponents('Win32', [TRichEdit50]);
end;

end.