Solved

create a component

Posted on 2004-08-17
6
288 Views
Last Modified: 2010-04-05
hi there....

I have a problem, i need to make a control wich has a TPanel inside another TPanel but i cant,
i have tryed at diferent ways, but it shows errors, or only show me the first panel....
could anybody help me with the syntax, i create the second panel inside constructor....
but it marks errors

unit Machine;

interface

uses
  SysUtils, Classes, Controls, ExtCtrls,QGraphics;

type
  TMachine = class(TPanel)
  private
    { Private declarations }
  protected
    { Protected declarations }
  public
    { Public declarations }
     CentralPanel:TPanel;
     constructor Create(Owner: TComponent); override;
  published
    { Published declarations }
  end;

procedure Register;

implementation

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

constructor TMachine.Create(Owner: TComponent);
begin
   inherited Create(Owner);  // Initialize inherited parts (TPanel)
   Width := 144;  // Change inherited properties
   Height := 166;
   Color:=clBtnFace;
   CentralPanel:=TPanel.Create(Owner);
   with CentralPanel do
     begin
        Name:='lbl_' + inttostr (self.ControlCount);
        Top:= 47;
        Left:=10;
        Color:=clSilver;
        Visible:=True;
    end;
end;


end.





0
Comment
Question by:BaTy_GiRl
[X]
Welcome to Experts Exchange

Add your voice to the tech community where 5M+ people just like you are talking about what matters.

  • Help others & share knowledge
  • Earn cash & points
  • Learn & ask questions
6 Comments
 
LVL 7

Accepted Solution

by:
LRHGuy earned 20 total points
ID: 11820321
Try adding:

  CentralPanel.Parent:=Self;

to make the panel show up on the form. Or assigned the parent as the other panel you want it to show up on.

Panel1:=tPanel.Create(form1);
panel1.parent:=form1;
panel2:=tPanel.Create(form1);
panel2.parent:=panel1;  //will be inside panel1 !
0
 
LVL 11

Expert Comment

by:shaneholmes
ID: 11820354
constructor TMachine.Create(Owner: TComponent);
begin
   inherited Create(Owner);  // Initialize inherited parts (TPanel)
   Width := 144;  // Change inherited properties
   Height := 166;
   Color:=clBtnFace;
   CentralPanel:=TPanel.Create(Owner);
   with CentralPanel do
     begin
       Parent:= Owner;  //********
       Name:='lbl_' + inttostr (self.ControlCount);
        Top:= 47;
        Left:=10;
        Color:=clSilver;
        Visible:=True;
    end;
end;

Shane
0
 

Author Comment

by:BaTy_GiRl
ID: 11820397
Thank you very much the wrong was with

CentralPanel.Parent:=Self;
0
Technology Partners: We Want Your Opinion!

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

 
LVL 4

Expert Comment

by:ceoworks
ID: 11820497
unit Unit1;

interface

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

type
  TForm1 = class(TForm)
    Button1: TButton;
    procedure FormCreate(Sender: TObject);
  private

  public
    { Public declarations }
  end;

  TMyPanel = class(TPanel)
  private
    FInsidePanel: TPanel;
  public
    constructor Create(AOwner: TComponent); override;
    destructor Destroy; override;
  end;

var
  Form1: TForm1;
  MyPanel: TMyPanel;

implementation

{$R *.dfm}

procedure TForm1.FormCreate(Sender: TObject);
begin
  MyPanel := TMyPanel.Create(Form1);
  with MyPanel do
  begin
    Color := clBlue;
    Left := 5;
    Top := 5;
    Height := 100;
    Width := 100;
    Parent := Self;
    Visible := True;
  end;
end;

{ TMyPanel }

constructor TMyPanel.Create(AOwner: TComponent);
begin
  inherited;
  Color := clBlue;

  FInsidePanel := TPanel.Create(Self);
  with FInsidePanel do
  begin
    Color := clRed;
    Height := 50;
    Width := 50;
    Parent := Self;
    Visible := True;
  end;
end;

destructor TMyPanel.Destroy;
begin

  inherited;
end;

end.
0
 
LVL 4

Expert Comment

by:ceoworks
ID: 11820508
Ohh i'm late :)

Cheers,

Oktay
0
 

Author Comment

by:BaTy_GiRl
ID: 11820660
anyway thank u very much, i did'n make a destructor
0

Featured Post

Independent Software Vendors: We Want Your Opinion

We value your feedback.

Take our survey and automatically be enter to win anyone of the following:
Yeti Cooler, Amazon eGift Card, and Movie eGift Card!

Question has a verified solution.

If you are experiencing a similar issue, please ask a related question

Objective: - This article will help user in how to convert their numeric value become words. How to use 1. You can copy this code in your Unit as function 2. than you can perform your function by type this code The Code   (CODE) The Im…
In my programming career I have only very rarely run into situations where operator overloading would be of any use in my work.  Normally those situations involved math with either overly large numbers (hundreds of thousands of digits or accuracy re…
There are cases when e.g. an IT administrator wants to have full access and view into selected mailboxes on Exchange server, directly from his own email account in Outlook or Outlook Web Access. This proves useful when for example administrator want…
Monitoring a network: how to monitor network services and why? Michael Kulchisky, MCSE, MCSA, MCP, VTSP, VSP, CCSP outlines the philosophy behind service monitoring and why a handshake validation is critical in network monitoring. Software utilized …

696 members asked questions and received personalized solutions in the past 7 days.

Join the community of 500,000 technology professionals and ask your questions.

Join & Ask a Question