Hi,
I am trying to create, at run time, a number of instances of a TTreeView. I have
created a class of this type and I will add some methods to this. I can create this
in one unit and, when I press a button on my form, things seem to work but I
cannot get this new object to display. The
You have to set the Parent property of the newly created Class;
i.e MyListView1.Parent := Self;
-Original Message-
From: Chrissy R [mailto:[EMAIL PROTECTED]]
Sent: Wednesday, 29 November 2000 15:51
To: Multiple recipients of list delphi
Subject: [DUG]: Creating A Class
Hi,
I am
Hi,
I am trying to create, at run time, a number of instances of a TTreeView.
I have
created a class of this type and I will add some methods to this. I can
create this
in one unit and, when I press a button on my form, things seem to work but
I
cannot get this new object to display. The
});
MyList.Parent := Self;
MyList1.Visible := True;
end;
Stacey
-Original Message-
From: Chrissy R [mailto:[EMAIL PROTECTED]]
Sent: Wednesday, 29 November 2000 3:51 p.m.
To: Multiple recipients of list delphi
Subject: [DUG]: Creating A Class
Hi,
I am trying to create, at run
, 29 November 2000 16:02
To: Multiple recipients of list delphi
Subject: RE: [DUG]: Creating A Class
You need to set the parent to a form, tabsheet, panel etc..
e.g.
procedure TForm1.Button1Click(Sender: TObject);
var
MyList1, Q: PMyList;
begin
New(Q);
MyList1 := Q;
MyList.Parent := Self
-Original Message-
From: Stacey Verner [mailto:[EMAIL PROTECTED]]
Sent: Wednesday, 29 November 2000 16:02
To: Multiple recipients of list delphi
Subject: RE: [DUG]: Creating A Class
You need to set the parent to a form, tabsheet, panel etc
Question - is the new component automatically freed when the form is
destroyed?
I've normally kept a list of components created on the fly and
specifically
freed them - maybe I don't need to.
Stephen
That's why I like to create the component with owner of self (ie the form).
When the form
On Wed, 29 Nov 2000, Chrissy R wrote:
I thought that the new component was freed when its parent is distroyed.
I think its when its owner (passed in the .Create()) is freed...
therefore, if you pass nil, you're responsible for freeing it.
Mark
--
"We don't guarantee anything except that it
On Wed, 29 Nov 2000, Chrissy R wrote:
I thought that the new component was freed when its parent is distroyed.
I think its when its owner (passed in the .Create()) is freed...
therefore, if you pass nil, you're responsible for freeing it.
Mark
Can I (and should I) re-assign the owner
On Wed, 29 Nov 2000, Chrissy R wrote:
Can I (and should I) re-assign the owner after I create something?
I don't believe you can reassign the owner no.
--
"We don't guarantee anything except that it will take up disk space..."
Apache 2.0alpha5 Disclaimer
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That's why I like to create the component with owner of self (ie the
form).
When the form is destroyed the component will automatically be
destroyed. Of
course it always depends what you are doing. Chrissy mentioned she had
problems using .Create(self) but that is probably being caused by
My problem was that the Create method wanted to TTreeView and Self was a
form. There was no other code other than the standard Delphi stuff for a
form
the following modification of your original post works (for me anyway).
I don't think there is a problem using self (i.e. the form) as
Stephen
I've normally kept a list of components created on the fly and
specifically
freed them - maybe I don't need to.
Depends on wether you pass and owner to the constructor or not,
Some people use Create(nil) in which case you clean up yourself or
Create(Form1) in which case the form
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