[Lazarus] Hiding a component by changing its parent

[Martin Grajcar]

On Mon, Aug 24, 2015 at 4:43 PM, Mattias Gaertner <nc-gaertnma at netcologne.de
> wrote:

> On Mon, 24 Aug 2015 16:29:49 +0200
> Martin Grajcar <maaartinus at gmail.com> wrote:
>
> > In code I'm working on, I've found a pattern like
> >
> > PROCEDURE HideIt;
> > BEGIN
> >   SomeComponent.Visible := FALSE;
> >   SomeComponent.Parent := SELF;
> >   SomeComponent.Visible := TRUE;
> > END;
> >
> > PROCEDURE ShowIt(NewParent: TForm);
> > BEGIN
> >   SomeComponent.Visible := FALSE;
> >   SomeComponent.Parent := NewParent;
> >   ...some more stuff...
> >   SomeComponent.Visible := TRUE;
> >   ...some more stuff...
> > END;
> >
> > I can't really see what it's good for. I guess, the idea was to preserve
> > the widget, but the widget seems to get freed immediately in the first
> > line. It comes from D7 or older. Does it make sense on Lazarus 1.4 using
> > GTK+?
>
> No.
> Simply do "SomeComponent.Parent := NewParent;".
>

Thank you for the information! Simplifying helped to get rid of a crash on
Linux
http://bugs.freepascal.org/view.php?id=28840
but there's still an event-related problem on Mac. Could someone tell me
more about what problem may get solved by using the more complicated stuff?

Martin.
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