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Re: GridBagLayout and cha

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  To: comp.lang.java.gui
On Mar 25, 10:28 pm, Brandon McCombs <n...@none.com> wrote:
> Daniel Pitts wrote:
> > Say I have the following code:
>
> > JPanel myPanel = new JPanel(new GridBagLayout());
> > GridBagConstraints constaints = getConstraints();
> > myPanel.add(new JLabel("Hello world"), constaints);
>
> > And then later (as a result of an Event), I do something like
> > constraints.gridx = 3;
> > myPanel.revalidate();
>
> > Will this have the expected effect, or do I need to remove the old
> > label, and re-add it with the new constraints?
>
> You will have to remove it and re-add it. How is Java to know which
> Object is supposed to have the new constraint if you don't re-add the
> Object with that constraint? It could assume to apply that new
> constraint property to the only Object in a JPanel if there is only one
> in it but that wouldn't work for more than 1 Object in container and it
> isn't a good way to do it anyway. It is bad design to need to
> relocate/resize an Object after an event occurs. You should rethink how
> you are presenting the interface to the user because the user should not
> normally see new things appear when they do something; all the Objects
> in the GUI should be visible, their sizes unchanging, and the unused
> ones disabled until they are needed (with the enabling trigger being
> your event).
Actually, I have four objects which would only trade places, and they
are similar enough that the change shouldn't bother users.  Have you
ever played a game on Yahoo games?  notice when you sit at a table,
your side becomes the southern most side.   I'm basically emulating
that effect.

It is easier to move the components around than to change which model
each component is looking at.  Either way, the effect would be the
same.

>
> As it is now, the line:
> myPanel.add(new JLabel("Hello world"), constaints);
>
> isn't going to do much because you aren't defining what your constraints
> are although some of the properties do have default values. The default
> for gridx is 'relative' which may not be what you want initially.

Hmm, I don't see how you think that my constraints object is unset. I
simply didn't copy the code that implemented getConstraints();

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GridBagLayout and changin "Daniel Pitts" <daniel.pitts@THRWHITE.remove-dii-this> - 2011-04-27 15:32 +0000
  Re: GridBagLayout and cha "Chris Smith" <chris.smith@THRWHITE.remove-dii-this> - 2011-04-27 15:32 +0000
  Re: GridBagLayout and cha "Knute Johnson" <knute.johnson@THRWHITE.remove-dii-this> - 2011-04-27 15:32 +0000
  Re: GridBagLayout and cha "Tom Hawtin" <tom.hawtin@THRWHITE.remove-dii-this> - 2011-04-27 15:32 +0000
    Re: GridBagLayout and cha "Daniel Pitts" <daniel.pitts@THRWHITE.remove-dii-this> - 2011-04-27 15:32 +0000
  Re: GridBagLayout and cha "SadRed" <sadred@THRWHITE.remove-dii-this> - 2011-04-27 15:32 +0000
    Re: GridBagLayout and cha "Daniel Pitts" <daniel.pitts@THRWHITE.remove-dii-this> - 2011-04-27 15:32 +0000
  Re: GridBagLayout and cha "SadRed" <sadred@THRWHITE.remove-dii-this> - 2011-04-27 15:32 +0000
  Re: GridBagLayout and cha "Brandon McCombs" <brandon.mccombs@THRWHITE.remove-dii-this> - 2011-04-27 15:32 +0000
    Re: GridBagLayout and cha "Daniel Pitts" <daniel.pitts@THRWHITE.remove-dii-this> - 2011-04-27 15:32 +0000
  Re: GridBagLayout and cha "Ian Wilson" <ian.wilson@THRWHITE.remove-dii-this> - 2011-04-27 15:32 +0000
    Re: GridBagLayout and cha "Daniel Pitts" <daniel.pitts@THRWHITE.remove-dii-this> - 2011-04-27 15:32 +0000
  Re: GridBagLayout and cha "Larry Barowski" <larry.barowski@THRWHITE.remove-dii-this> - 2011-04-27 15:32 +0000
  Re: GridBagLayout and cha "Larry Barowski" <larry.barowski@THRWHITE.remove-dii-this> - 2011-04-27 15:32 +0000

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