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Creating component

Posted on 2004-03-30
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Last Modified: 2010-04-05
Hello,

Is it possible to create somekind like a "wrapper" for an object?

I meant, we know TButton object, it has some properties like :
- caption
- left
- top

I want to create another TButton component that will have PRESET value :
- caption = "Click me"
- left = 100
- top = 100

Everytime I add this component into a form, it will have those propertie's values.

Also, is it possible to create somekind of "compound" object? For example, if I add this component into a form, it will create TWO buttons and a listbox.

Thanks.
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Question by:nova2002
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3 Comments
 
LVL 11

Expert Comment

by:shaneholmes
ID: 10718967


 TMyButton = class(TButton)
 public
  Constructor Create(AOwner: TComponent);override;
 end;

  ConstructorTMyButton.Create(AOwner: TComponent);override;
  begin
   inherited Create(AOwner);
   Caption:-= 'Click Me';
   Left:= 100;
   Top:= 100;
  end;


Shane
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LVL 11

Expert Comment

by:shaneholmes
ID: 10718977
Yes it is possible to create compound objects?

Shane
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LVL 11

Accepted Solution

by:
shaneholmes earned 80 total points
ID: 10719099
SOmething like


This is a Panel with a Button and Listbox

Quick sample

Shane


unit ExtPanel1;

interface

uses
  SysUtils, Classes, Controls, ExtCtrls, StdCtrls;

type
  TExtPanel1 = class(TPanel)
  private
    { Private declarations }
    fButton: TButton;
    fListBox: TListBox;
  protected
    { Protected declarations }
  public
    { Public declarations }
    constructor Create(AOwner: TComponent);override;
    destructor Destroy;override;
  published
    { Published declarations }
    property Button: TButton read fButton write fButton;
    property ListBox: TListBox read fListBox write fListBox;
  end;

procedure Register;

implementation


destructor TExtPanel1.Destroy;
begin
 fButton.Free;
 fListBox.Free;
 inherited Destroy;
end;

constructor TExtPanel1.Create(AOwner: TComponent);
begin
 inherited Create(AOwner);
 ControlStyle := ControlStyle - [csSetCaption];
 Caption:= '';
 Width:= 200;
 Height:= 100;
 fButton:= TButton.Create(Self);
 fButton.Parent:= Self;
 fButton.Left:= 10;
 fButton.Top:= 10;
 fButton.Caption:= '';

 fListBox:= TListBox.Create(Self);
 fListBox.Parent:= Self;
 fListBox.Left:= 10;
 fListBox.Top:= 50;

end;

procedure Register;
begin
  RegisterComponents('Samples', [TExtPanel1]);
end;

end.
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