One advantage of Notification is that you can get notified _even if_ you
don't own the component that is being destroyed. If TComponentEditor doesnt
have such a method, you might find that having the form notify it is still
the most elegant of the remaining options - there certainly don't look to be
many useful methods you can employ in TComponentEditor!
Here's how you use it.
1. Call MyEditorForm.FreeNotification(TheComponent);
This puts MyEditorForm into the notification list of TheComponent, and also
puts TheComponent into the notification list of MyEditorForm (both are
necessary).
2. Override MyEditorForm.Notification. Call the inherited method (which will
remove TheComponent from the form's notification list). Check to see if the
component parameter is TheComponent, and send yourself a message to close or
whatever.
And that takes care of it! Notification is called from the TComponent
destructor.
Regards,
Andrew Cooke.
> -----Original Message-----
> From: [EMAIL PROTECTED]
> [SMTP:[EMAIL PROTECTED]]
> Sent: Thursday, May 20, 1999 11:49 AM
> To: Multiple recipients of list delphi
> Subject: Re: [DUG]: freeing a component editor when the component i
>
> The notification method for which component?
>
> The TComponentEditor does not have such a method
>
> The TComponent.Notification method is to be notified when other components
> are deleted.
>
> The TCustomForm.Notification method might be relevant, but I don't want
> the
> editing form (see my newly posted message for a better description of my
> problem) to have to tell my TComponentEditor descendant that the component
> is no longer there. In any case, I don't think the editing form would
> recieve the notification when the component is removed because the form
> doesn't actually own it (the form being designed in the IDE does) - it
> just
> refers to it.
>
> Thanks anyway,
>
> Phil.
> [EMAIL PROTECTED]
>
>
>
>
>
> From: [EMAIL PROTECTED] (Rohit Gupta) AT tawa on 20/05/99 11:02 ZE12
>
> To: Multiple recipients of list delphi <[EMAIL PROTECTED]> AT
> tawa@kauripo@CCMAIL
> cc: (bcc: Phillip Middlemiss/NZ Forest Research Institute/NZ)
> Subject: Re: [DUG]: freeing a component editor when the component i
>
>
>
>
> Have a look at the method called Notification
>
> On 18 May 99 at 11:41, [EMAIL PROTECTED] wrote:
>
> > Hi,
> >
> > How do I ensure that my component editor is notified when the component
> it > is editing is about to be destroyed (or the unit closed)?
> >
>
> Rohit
>
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