🚀 go-pugleaf

Hi!
I'm sorry but I don't understand, the validate( ) function works after the
JPanel.add(...), but not after the JPanel.removeAll( );
If I just do:

JPanel    jPanel1 = new JPanel( );

jPanel1.add(new JLabel("Hello") );


and then later when I do:

jPanel1.removeAll( );
jPanel1.validate( );

I still need to resize the Frame to make the changes appear!



rwilkman wrote:

> Aurelien:
>
> Which one you use depends on the tasks, what you might be doing between
> the invalidate() and the time it gets done, etc.  Often it's good enough
> to simply do all the work and call validate() at the end.
>
> -Rich
>
> Aurelien Broszniowski wrote:
> >
> > Ok I see! Thanks a lot.
> > invalidate() is to be called after or before ? and for add or remove ?
> >
> > Should I do write like:
> >
> >   jPanel1.invalidate();
> >   jPanel1.removeAll();
> >   jPanel1.add(new JLabel("Hello"));
> >   jPanel1.validate();
> >
> > ?
> >
> > Because I tried this above, and it's nearly ok, but not totally. Indeed, it seems
> > to
> > refresh well about the jPanel1.add(...), but not about the jPanel1.removeAll()
> >
> > rwilkman wrote:
> >
> > > Aurelien:
> > >
> > > When you add or remove components from a container, you must call
> > > Container.invalidate() and/or Container.validate().  Resizing the
> > > container simply forces these calls.
> > >
> > > -Rich
> > >
> > > Aurelien Broszniowski wrote:
> > > >
> > > > Paul Furbacher wrote:
> > > >
> > > > > Aurelien Broszniowski wrote:
> > > > >
> > > > > > I've got a problem with a JPanel, when I want to update the contents, I
> > > > > > do:
> > > > > >
> > > > > >  jPanel1.removeAll();
> > > > > >  jPanel1.add(new JLabel("Hello"));
> > > > > >
> > > > > > But I need to resize the Frame by hand with my mouse before the JPanel
> > > > > > shows the updates!
> > > > >
> > > > > Have you called "jPanel1.invalidate()"?
> > > > >
> > > > > Paul Furbacher (TeamB)
> > > >
> > > > No, actually I really did a very simple application with a Frame into which
> > > > there's a JPanel where I want to add and remove components.
> > >
> > > --
> > > =====
> > > Rich Wilkman
> > > Senior Quality Assurance Engineer
> > > JBuilder Team
> > >
> > > If something in this post looks like an opinion, walks like an
> > > opinion and quacks like an opinion, it's mine and not that of
> > > my employer.
> > >
> > > If you are reading this from a newsgroup post, don't send mail.
> > > =====
>
> --
> =====
> Rich Wilkman
> Senior Quality Assurance Engineer
> JBuilder Team
>
> If something in this post looks like an opinion, walks like an
> opinion and quacks like an opinion, it's mine and not that of
> my employer.
>
> If you are reading this from a newsgroup post, don't send mail.
> =====