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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 image dans un TEdit
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