Imgbtn with caption?

[Razor]

Is it possible to add a caption to an Timgbtn?Caption like a normal button has?
Couse now its only an image button with 3 states.

I've tried imgbtn.canvas.textout(x,y,text) >> this only works when theres no bitmap loaded

Delphi-Quellcode:

unit ImgBtn;

interface

uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
  ExtCtrls;

type
  TOnMouseEvent = procedure( Msg: TWMMouse ) of object;

  TImgBtn = class( TImage )
  protected
    procedure WMMouseEnter( var Msg : TWMMouse ); message CM_MOUSEENTER;
    procedure WMMouseLeave( var Msg : TWMMouse ); message CM_MOUSELEAVE;
    procedure WMLButtonUp( var Msg : TWMLButtonUp ); message WM_LBUTTONUP;
    procedure WMLButtonDown( var Msg : TWMLButtonUp ); message WM_LBUTTONDOWN;
  private
    FEntered : boolean;
    FDown : boolean;
    FOnMouseEnter : TOnMouseEvent;
    FOnMouseLeave : TOnMouseEvent;
    FOnMouseDown  : TOnMouseEvent;
    FOnMouseUp    : TOnMouseEvent;
    FPic : TPicture;
    FPicDown : TPicture;
    FPicUp : TPicture;
    FSupported : boolean;
    procedure SetPic( Value : TPicture );
    procedure SetPicDown( Value : TPicture );
    procedure SetPicUp( Value : TPicture );
  public
    constructor Create( AOwner: TComponent ); override;
    destructor Destroy; override;
  published
    //** Images **//
    property Pic : TPicture read FPic write SetPic;
    property PicDown : TPicture read FPicDown write SetPicDown;
    property PicUp : TPicture read FPicUp write SetPicUp;
    //** Events **//
    property OnMouseDown : TOnMouseEvent read FOnMouseDown write FOnMouseDown;
    property OnMouseEnter : TOnMouseEvent read FOnMouseEnter write FOnMouseEnter;
    property OnMouseLeave : TOnMouseEvent read FOnMouseLeave write FOnMouseLeave;
    property OnMouseUp : TOnMouseEvent read FOnMouseUp write FOnMouseUp;
    property Supported : boolean read FSupported write FSupported;
  end;

procedure Register;

implementation
{$R *.RES}

(*******************************************************************************)
procedure Register;
begin
  RegisterComponents( 'Plus', [ TImgBtn ] );
end;

(*******************************************************************************)
constructor TImgBtn.Create;
begin
  inherited;
  FPic := TPicture.Create;
  FPicUp := TPicture.Create;
  FPicDown := TPicture.Create;
  FEntered := False;
  FDown := False;
  FSupported := True;
end;

(*******************************************************************************)
destructor TImgBtn.Destroy;
begin
  FPic.Free;
  FPicDown.Free;
  FPicUp.Free;
  inherited;
end;

(*******************************************************************************)
procedure TImgBtn.WMMouseEnter( var Msg: TWMMouse );
begin
  if not FSupported then Exit;
  FEntered := True;
  if FDown then Picture := FPicDown else Picture := FPicUp;
  if Assigned( FOnMouseEnter ) then FOnMouseEnter( Msg );
end;

(*******************************************************************************)
procedure TImgBtn.WMMouseLeave( var Msg: TWMMouse );
begin
  if not FSupported then Exit;
  FEntered := False;
  Picture := FPic;
  if Assigned( FOnMouseLeave ) then FOnMouseLeave( Msg );
end;

(*******************************************************************************)
procedure TImgBtn.WMLButtonDown(var Msg: TWMMouse);
begin
  inherited;
  if not FSupported then Exit;
  FDown := True;
  if FEntered then Picture := FPicDown;
  if Assigned( FOnMouseDown ) then FOnMouseDown( Msg );
end;

(*******************************************************************************)
procedure TImgBtn.WMLButtonUp(var Msg: TWMMouse);
begin
  inherited;
  if not FSupported then Exit;
  FDown := False;
  if FEntered then Picture := FPicUp;
  if Assigned( FOnMouseUp ) then FOnMouseUp( Msg );
end;

(*******************************************************************************)
procedure TImgBtn.SetPic( Value : TPicture );
begin
  Picture := Value;
  FPic.Assign( Value );
end;

(*******************************************************************************)
procedure TImgBtn.SetPicDown( Value : TPicture );
begin
  FPicDown.Assign( Value );
end;

(*******************************************************************************)
procedure TImgBtn.SetPicUp( Value : TPicture );
begin
  FPicUp.Assign( Value );
end;

end.

[DeddyH]

As I said in the other thread, you have to override the paint-method. Just try it like this:

Delphi-Quellcode:

procedure TImgBtn.Paint;
begin
  inherited;
  Canvas.Brush.Style := bsClear;
  Canvas.TextOut(0,0,'Hello World');
end;

[Razor]

:? I don't quite understand you have to put this in the source code of the imgbtn.
Becouse this draws on the form btw.

[DeddyH]

Why should it draw on the form when it is a method of TImgBtn?

[invalid_operation]

Zitat:

Zitat von DeddyH

As I said in the other thread, you have to override the paint-method. Just try it like this:

Delphi-Quellcode:

procedure TImgBtn.Paint;
begin
  inherited;
  Canvas.Brush.Style := bsClear;
  Canvas.TextOut(0,0,'Hello World');
end;

Und nur weil der Fragende "english" ist, sollte man ihm nicht alles durchgehen lassen.

[mkinzler]

Primarily you paint on the Canvas of the Button. The container control askes then for paint of the child-controls

[Razor]

I did what you said and i get an error wich says
---------------------------
Debugger Exception Notification
---------------------------
Project Project2.exe raised exception class EInvalidOperation with message 'Can only modify an image if it contains a bitmap'.
---------------------------
Break Continue Help
---------------------------

[DeddyH]

Please show us your current source.

[Razor]

:) Here it is!

Delphi-Quellcode:

unit ImgBtn;

//* ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ *//
//*  ImgBtn. Delphi 3, 4
//*
//* This component turns 3 images to button with 3 states : normal, MouseOver
//* and Pressed. I've also added some importent events.
//*
//* Writen by Paul Krestol.
//* For contacts e-mail me to : [email][e-mail][/email]
//* ++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++ *//


interface

uses
  Windows, Messages, SysUtils, Classes, Graphics, Controls, Forms, Dialogs,
  ExtCtrls;

type
  TOnMouseEvent = procedure( Msg: TWMMouse ) of object;

  TImgBtn = class( TImage )
  protected
    procedure WMMouseEnter( var Msg : TWMMouse ); message CM_MOUSEENTER;
    procedure WMMouseLeave( var Msg : TWMMouse ); message CM_MOUSELEAVE;
    procedure WMLButtonUp( var Msg : TWMLButtonUp ); message WM_LBUTTONUP;
    procedure WMLButtonDown( var Msg : TWMLButtonUp ); message WM_LBUTTONDOWN;
  private
    FEntered : boolean;
    FDown : boolean;
    FOnMouseEnter : TOnMouseEvent;
    FOnMouseLeave : TOnMouseEvent;
    FOnMouseDown  : TOnMouseEvent;
    FOnMouseUp    : TOnMouseEvent;
    FPic : TPicture;
    FPicDown : TPicture;
    FPicUp : TPicture;
    FSupported : boolean;
    procedure SetPic( Value : TPicture );
    procedure SetPicDown( Value : TPicture );
    procedure SetPicUp( Value : TPicture );

  public
    constructor Create( AOwner: TComponent ); override;
    destructor Destroy; override;
  published
    //** Images **//
    property Pic : TPicture read FPic write SetPic;
    property PicDown : TPicture read FPicDown write SetPicDown;
    property PicUp : TPicture read FPicUp write SetPicUp;
     procedure  Paint ;
    //** Events **//
    property OnMouseDown : TOnMouseEvent read FOnMouseDown write FOnMouseDown;
    property OnMouseEnter : TOnMouseEvent read FOnMouseEnter write FOnMouseEnter;
    property OnMouseLeave : TOnMouseEvent read FOnMouseLeave write FOnMouseLeave;
    property OnMouseUp : TOnMouseEvent read FOnMouseUp write FOnMouseUp;
    property Supported : boolean read FSupported write FSupported;
  end;

procedure Register;

implementation
{$R *.RES}

(*******************************************************************************)
procedure Register;
begin
  RegisterComponents( 'Plus', [ TImgBtn ] );
end;

(*******************************************************************************)
constructor TImgBtn.Create;
begin
  inherited;
  FPic := TPicture.Create;
  FPicUp := TPicture.Create;
  FPicDown := TPicture.Create;
  FEntered := False;
  FDown := False;
  FSupported := True;
end;
 procedure  TImgBtn.Paint ;
begin
  inherited;
  Canvas.Brush.Style := bsClear;
  Canvas.TextOut(0,0,'Hello World');
end;
(*******************************************************************************)
destructor TImgBtn.Destroy;
begin
  FPic.Free;
  FPicDown.Free;
  FPicUp.Free;
  inherited;
end;

(*******************************************************************************)
procedure TImgBtn.WMMouseEnter( var Msg: TWMMouse );
begin
  if not FSupported then Exit;
  FEntered := True;
  if FDown then Picture := FPicDown else Picture := FPicUp;
  if Assigned( FOnMouseEnter ) then FOnMouseEnter( Msg );
end;

(*******************************************************************************)
procedure TImgBtn.WMMouseLeave( var Msg: TWMMouse );
begin
  if not FSupported then Exit;
  FEntered := False;
  Picture := FPic;
  if Assigned( FOnMouseLeave ) then FOnMouseLeave( Msg );
end;

(*******************************************************************************)
procedure TImgBtn.WMLButtonDown(var Msg: TWMMouse);
begin
  inherited;
  if not FSupported then Exit;
  FDown := True;
  if FEntered then Picture := FPicDown;
  if Assigned( FOnMouseDown ) then FOnMouseDown( Msg );
end;

(*******************************************************************************)
procedure TImgBtn.WMLButtonUp(var Msg: TWMMouse);
begin
  inherited;
  if not FSupported then Exit;
  FDown := False;
  if FEntered then Picture := FPicUp;
  if Assigned( FOnMouseUp ) then FOnMouseUp( Msg );
end;

(*******************************************************************************)
procedure TImgBtn.SetPic( Value : TPicture );
begin
  Picture := Value;
  FPic.Assign( Value );
end;

(*******************************************************************************)
procedure TImgBtn.SetPicDown( Value : TPicture );
begin
  FPicDown.Assign( Value );
end;

(*******************************************************************************)
procedure TImgBtn.SetPicUp( Value : TPicture );
begin
  FPicUp.Assign( Value );
end;

end.

[invalid_operation]

Zitat:

Zitat von mkinzler

Primarily you paint on the Canvas of the Button. The container control askes then for paint of the child-controls

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