:-) :-) thats why we need in Lazarus a Parent as well.

Marc

You don't have to raise an exception. I sometimes have controls about without parents. Of course they are not visible, I set the parent when and where I want them to appear.

I also often change the parent during runtime to make controls appear somewhere else (hence need for destroywnd and createwnd)

Sam

Marc, you obsolutly need a parent in Delphi else you raise an exception.

Vital Tremblay

Ok You're right, I did try to raise an exception but it didn't. I used to recall a time when that did but may be was just a special case or in a previous version of Delphi where it behave differently. Thank Sylvain!

Vital Tremblay

+ From: Samuel Liddicott
+
+ > -----Original Message-----
+ > From:
+ >
+ > At 02:24 99-12-07 +0100, I wrote:
+ > >
+ > >Ah, thats an easy one.
+ > >
+ > >Since now (or for while), to show a control is has to have
+ > >at least a
+ > >Parent. In the past the owner was erroneous used as a parent.
+ > (The owner is
+ > >the VCL/LCL class owner, not the graphical owner). Thats
+ > >why the button
+ > >doid show up in the past and didnt till now.
+ > >(You can try to create a button without parent in Delphi!)
+ > >
+ > >Marc
+ >
+ > Marc, you obsolutly need a parent in Delphi else you raise
+ > an exception.
+
+ You don't have to raise an exception. I sometimes have controls about
+ without parents. Of course they are not visible, I set the
+ parent when and
+ where I want them to appear.
+
+ I also often change the parent during runtime to make controls appear
+ somewhere else (hence need for destroywnd and createwnd)

You only get an exeption if you want the handle of your control when it has no parent. And as far as I can recall in Lazarus it is the same. As long as you don't need the handle (IE, the physical component) it is OK to have no parent.

Marc

----- Original Message -----
From:
To:
Sent: Monday, December 06, 1999 8:29 PM
Subject: Re: Fixed: Hello WAS: Re: [lazarus] Editor crashing when adding text

is

Sorry Vital but i have to tell you that not setting a parent for a TComponent wont
raise an exception. The effect of not setting a parent is that it will not show up since
it doesn't no where to show up.

try that code:

procedure TForm1.Button1Click(Sender: TObject);
Var
  MyButton : TButton;
begin
  MyButton := TButton.Create(Self);//No exception raised here
end;

Now try this one:

procedure TForm1.Button1Click(Sender: TObject);
Var
  MyButton : TButton;
begin
  MyButton := TButton.Create(Self);
  MyButton.Parent := Self; // Magic, it show itself on the form
end;

Sylvain Lamothe :)

you wrote

At 20:29 06-12-99 -0500, you wrote: :-) :-) thats why we need in Lazarus a Parent as well. Marc

Also, must of the time the Owner of a TComponent is a Tform and the Owner of a TForm is The TApplication and the Owner of the Application is Nil. That's the way Delphi does when loading component from a .dfm but it you create a TForm at the run time you could make his Owner Nil in this case you must manualy freed this form while when the Owner of a TForm is Application Delphi automaticaly Free it when the application is closing.

Vital Tremblay