[Lazarus] Une image dans un TEdit

J'ai essayé de transformer le composant trouvé pour Delphi , mais malgré une compilation/installation réussie rien ne se passe .
cependant mes tests actuels sont sous Vista avec le thème vista . J'ai déjà eu des soucis du même type en essayant de mettre un titre ou un bouton dans la barre de caption .

Pour ceux que ça intéresse en voici la teneur
Code:
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unit uTransEditPict5;
 
//******************************************************************************
// Permet de créer un Composant descendant de TEdit et dont le fond est :
// - soit Opaque et de couleur unie,
// - soit formé par une Image de fond
// - soit Transparent et dans ce cas c''est l''arrière-plan de l''Edit qui apparait,
//
// Code modifié à partir de celui du TZ9Edit disponible
// ici : http://www.lummie.co.uk/painting-the-background-of-tedit/
//******************************************************************************
 
// Pour l'utilistion, poser un Composant TTranspaEditPict5 sur la fiche
// l''image choisie via l''ellipse associée à la proprité propriété Picture
// apparaît seulement lors du lancement de l''application
 
{$mode objfpc}{$H+}
 
interface
 
uses   Classes, SysUtils, LResources, Forms, Controls, Graphics, Dialogs, StdCtrls,
       LCLStrConsts, LCLIntf, LCLProc, LCLType, LMessages, Types,
{$IFDEF WINDOWS}
    Windows, Messages
{$ELSE}
    WinProc,Wintypes
{$ENDIF}
 ;
 
 
type
 
  TTranspaEditPict5 = class(TEdit) // TZ9Edit Modifié voir les //<**
  private
    { Private declarations }
    FPictureFond   : TPicture;  //<**
    FPictureFondVisible : boolean;
    FAlignText      : TAlignment;
    FTransparent    : Boolean;
    FPainting       : Boolean;
    procedure SetPictureFond(Value: TPicture);  //<**
    procedure SetAlignText(Value: TAlignment);
    procedure SetTransparent(Value: Boolean);
 
  protected
    { Protected declarations }
    procedure RepaintWindow;
    procedure Change; override;
    procedure SetParent(AParent: TWinControl); override;
    procedure WMPaint(var Message: TWMPaint); message WM_PAINT;
    procedure WMNCPaint (var Message: TMessage); message WM_NCPAINT;
    procedure WMEraseBkGnd(var Message: TWMEraseBkGnd); message WM_ERASEBKGND;
    procedure CNCtlColorEdit(var Message: TWMCtlColorEdit); message CN_CTLCOLOREDIT;
    procedure CNCtlColorStatic(var Message: TWMCtlColorStatic); message CN_CTLCOLORSTATIC;
    procedure CMParentColorChanged(var Message: TMessage); message CM_PARENTCOLORCHANGED;
    procedure WMSize(var Message: TWMSize); message WM_SIZE;
    procedure WMMove(var Message: TWMMove); message WM_MOVE;
    procedure PaintParent(ACanvas: TCanvas);
  public
    { Public declarations }
    procedure   CreateParams(var Params: TCreateParams);override;
    constructor Create(AOwner: TComponent); override;
    procedure   SetPictureFondVisible(Value: boolean); //<**
    destructor  Destroy; override;
  published
    { Published declarations }
    property Align;
    property AlignText   : TAlignment read FAlignText   write SetAlignText   default taLeftJustify;
    property Transparent : Boolean    read FTransparent write SetTransparent default False;
    property Picture     : TPicture   read FPictureFond write SetPictureFond; //<**
    property PictureVisible: boolean  read FPictureFondVisible write SetPictureFondVisible default False; //<**
end;
 
procedure Register;
 
implementation
 
procedure Register;
begin     RegisterComponents('Compos Transparents', [TTranspaEditPict5]);
end;
 
type      TParentControl = class(TWinControl);
 
const     BorderRec: array[TBorderStyle] of Integer = (1, -1);
 
constructor TTranspaEditPict5.Create(AOwner: TComponent);
begin       inherited Create(AOwner);
            FPictureFond := TPicture.Create;
            FAlignText   := taLeftJustify;
            FTransparent := false;
            FPainting    := false;
            Invalidate;
end;
 
procedure  TTranspaEditPict5.SetParent(AParent: TWinControl);
begin      inherited SetParent(AParent);
           Invalidate;
end;
 
procedure TTranspaEditPict5.SetPictureFond(Value : TPicture);
begin     if FPictureFond <> Value then
          begin FPictureFond.Assign(Value);
                FTransparent       :=True;
                FPictureFondVisible:=True;
                Invalidate;
          end;
end;
 
procedure TTranspaEditPict5.SetPictureFondVisible(Value: Boolean); //<**
begin     if FPictureFondVisible <> Value then
          begin FPictureFondVisible := Value;
                Invalidate;
          end;
end;
 
destructor TTranspaEditPict5.Destroy;
begin      FPictureFond.Free; //<**
           inherited Destroy;
end;
 
procedure TTranspaEditPict5.SetAlignText(Value: TAlignment);
begin     if FAlignText <> Value then
          begin FAlignText := Value;
//                RecreateWnd(self);
                Invalidate;
          end;
end;
 
procedure TTranspaEditPict5.SetTransparent(Value: Boolean);
begin     if FTransparent <> Value then
          begin FTransparent := Value;
                Invalidate;
          end;
end;
 
procedure TTranspaEditPict5.WMEraseBkGnd(var Message: TWMEraseBkGnd);
var       DC: hDC; canvas : TCanvas; oldBrush : TBrush;
begin     if FTransparent and not(csDesigning in componentstate) then
          begin if Not FPictureFondVisible then
                begin canvas := TCanvas.create;
                      try canvas.handle := message.dc;
                          PaintParent(Canvas);
                      finally
                          canvas.free;
                      end;
                end else
                if FPictureFondVisible Then
                begin DC:=message.dc;
                      SetBkMode(DC, 1); //SetBkMode(DC, 1 = TRANSPARENT);
                      Canvas := TCanvas.Create;
                      try oldbrush := Canvas.Brush;
                          canvas.handle := dc;
                          Canvas.Font.Color  := Self.Font.Color;
                          Canvas.Brush.Style := bsClear ;
                          Canvas.draw(0,0,FPictureFond.Bitmap);
                          Canvas.Brush := oldbrush;
                      finally
                          Canvas.Free;
                      end;
                end;
          end else
          begin canvas := TCanvas.create;
                try canvas.handle := message.dc;
                    canvas.brush.color := Color;
                    canvas.brush.style := bsSolid;
                    canvas.fillrect(clientrect);
                finally
                    canvas.free;
                end;
          end;
end;
 
 
procedure TTranspaEditPict5.WMPaint(var Message: TWMPaint);
begin
   inherited;
   if FTransparent then
   begin
    Brush.Bitmap:=FPictureFond.Bitmap;
    if not FPainting then RepaintWindow;
   end;
end;
 
 
 
procedure TTranspaEditPict5.WMNCPaint(var Message: TMessage);
begin     inherited;
end;
 
procedure TTranspaEditPict5.CNCtlColorEdit(var Message: TWMCtlColorEdit);
begin     inherited;
          if FTransparent then SetBkMode(Message.ChildDC, 1);
end;
 
procedure TTranspaEditPict5.CNCtlColorStatic(var Message: TWMCtlColorStatic);
begin     inherited;
          if FTransparent then SetBkMode(Message.ChildDC, 1);
end;
 
procedure TTranspaEditPict5.CMParentColorChanged(var Message: TMessage);
begin     inherited;
          if FTransparent then Invalidate;
end;
 
procedure TTranspaEditPict5.WMSize(var Message: TWMSize);
var       r : TRect;
begin     inherited;
          r := ClientRect;
          InvalidateRect(handle,@r,false);
end;
 
procedure TTranspaEditPict5.WMMove(var Message: TWMMove);
var       r : TRect;
begin     inherited;
          Invalidate;
          r := ClientRect;
          InvalidateRect(handle,@r,false);
end;
 
procedure TTranspaEditPict5.RepaintWindow;
var       DC: hDC; TmpBitmap, Bitmap: hBitmap;
begin     if FTransparent then
          begin FPainting := true;
                HideCaret(Handle);
                DC := CreateCompatibleDC(GetDC(Handle));
                TmpBitmap := CreateCompatibleBitmap( GetDC(Handle), Succ(ClientWidth),
                                                     Succ(ClientHeight));
                Bitmap := SelectObject(DC, TmpBitmap);
                PaintTo(DC, 0, 0);
                BitBlt( GetDC(Handle), BorderRec[BorderStyle] + BorderWidth,
                        BorderRec[BorderStyle] + BorderWidth, ClientWidth,
                        ClientHeight, DC, 1, 1, SRCCOPY);
                SelectObject(DC, Bitmap);
                DeleteDC(DC);
                ReleaseDC(Handle, GetDC(Handle));
                DeleteObject(TmpBitmap);
                ShowCaret(Handle);
                FPainting := false;
          end;
end;
 
procedure TTranspaEditPict5.CreateParams(var Params: TCreateParams);
const     Alignments: array [TAlignment] of DWord = (ES_LEFT, ES_RIGHT, ES_CENTER);
begin     inherited CreateParams(Params);
          Params.Style := Params.Style or ES_MULTILINE or Alignments[FAlignText];
end;
 
procedure TTranspaEditPict5.Change;
begin     RepaintWindow;
          inherited Change;
end;
 
procedure TTranspaEditPict5.PaintParent(ACanvas: TCanvas);
var       I, Count, X, Y, SaveIndex: integer;
          DC: cardinal;
          R, SelfR, CtlR: TRect;
          Control : TControl;
begin     Control := Self;
          if Control.Parent = nil then Exit;
          Count := Control.Parent.ControlCount;
          DC := ACanvas.Handle;
          SelfR := Bounds(Control.Left, Control.Top, Control.Width, Control.Height);
          X := -Control.Left; Y := -Control.Top;
          // Copy parent control image
          SaveIndex := SaveDC(DC);
          SetViewportOrgEx(DC, X, Y, nil);
          IntersectClipRect(DC, 0, 0, Control.Parent.ClientWidth, Control.Parent.ClientHeight);
          TParentControl(Control.Parent).Perform(WM_ERASEBKGND,DC,0);
          TParentControl(Control.Parent).PaintWindow(DC);
          RestoreDC(DC, SaveIndex);
          //Copy images of graphic controls
          for I := 0 to Count - 1 do
          begin if (Control.Parent.Controls[i] <> nil) then
                begin if Control.Parent.Controls[i] = Control then break;
                      with Control.Parent.Controls[i] do
                      begin CtlR := Bounds(Left, Top, Width, Height);
                            if Bool(IntersectRect(R, SelfR, CtlR)) and Visible then
                            begin SaveIndex := SaveDC(DC);
                                  SetViewportOrgEx(DC, Left + X, Top + Y, nil);
                                  IntersectClipRect(DC, 0, 0, Width, Height);
                                  Perform(WM_ERASEBKGND,DC,0);
                                  Perform(WM_PAINT, integer(DC), 0);
                                  RestoreDC(DC, SaveIndex);
                            end;
                      end;
                end;
          end;
end;
 
END.
une âme charitable pourrait-il le tester sous XP ou sous Linux ?
ou mieux encore le corriger :lol: