?
Solved

create a component

Posted on 2004-08-17
6
Medium Priority
?
289 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 80 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
VIDEO: THE CONCERTO CLOUD FOR HEALTHCARE

Modern healthcare requires a modern cloud. View this brief video to understand how the Concerto Cloud for Healthcare can help your organization.

 
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

On Demand Webinar: Networking for the Cloud Era

Did you know SD-WANs can improve network connectivity? Check out this webinar to learn how an SD-WAN simplified, one-click tool can help you migrate and manage data in the cloud.

Question has a verified solution.

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

The uses clause is one of those things that just tends to grow and grow. Most of the time this is in the main form, as it's from this form that all others are called. If you have a big application (including many forms), the uses clause in the in…
Hello everybody This Article will show you how to validate number with TEdit control, What's the TEdit control? TEdit is a standard Windows edit control on a form, it allows to user to write, read and copy/paste single line of text. Usua…
If you’ve ever visited a web page and noticed a cool font that you really liked the look of, but couldn’t figure out which font it was so that you could use it for your own work, then this video is for you! In this Micro Tutorial, you'll learn yo…
In this video, Percona Solution Engineer Rick Golba discuss how (and why) you implement high availability in a database environment. To discuss how Percona Consulting can help with your design and architecture needs for your database and infrastr…
Suggested Courses

752 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