[maemo-developers] [maemo-developers] Switching between appviews ...

[From: Kalle Vahlman]

On 7/2/05, Jorge Souza <sao_jorge31 at yahoo.com.br> wrote:
> Hi all,
> 
> I wonder if someone could help me with a relative
> newbie question. Actually, I'm not able to make the
> switch between two 'hildonappviews' work properly.

That's because you are using them improperly ;)

> What I am trying to do is basically build two
> different HildonAppView with some widgets in them, and
> switching between these appviews using the hildon
> environment task navigator (with the mouse/stylus).

It's easy!
 
> Following is the code that handles this switching
> (inside the "switch_to" signal callback):
> 
> <quoted>
> 
> gtk_container_remove(GTK_CONTAINER(appview),
>          GTK_WIDGET(label_test1));
> gtk_container_add(GTK_CONTAINER(appview),
>               GTK_WIDGET(label_test2));
> gtk_widget_show(GTK_WIDGET(label_test2));
> 
> hildon_app_notify_view_changed(appview, label_test2);
> 
> </quoted>

The switching needs no widget juggling, the only thing that is
actually reparented is  the appviews, but that's an implementation
detail.

The proper way to do this is to:

1) create an HildonApp

2) create two or more HildonAppViews

3) register other AppViews with the app:
  hildon_app_register_view (HILDON_APP (app), appview2);
 
4) set the initially visible/active appview:
  hildon_app_set_appview (HILDON_APP (app), appview);

and you are done. Nothing else is needed (well, populating and showing
the views and the app is a good idea of course). The point 3/4
ordering is important it seems (this is a bug I think). Also note that
the appview set with set_appview() should not be registered as this
happens automatically (at least if you haven't set autoregistration to
FALSE, it defaults to TRUE).

The "switched_{to,from}" signals are just to notify your application
that the switch is made, in case you want to do something special in
your app when that happens.

> Am I missing something !? What am I doing wrong ?!

You just confused appview with app, I think.

<hint for documentation people>
There really should be a tutorial with multiple appviews on maemo.org.
</hint for documentation people>
 
> ps: if this is not the correct mail list to make
> question like mine, could you point me the right one
> !?

This is just the right one, another place to ask is the IRC-channel
#maemo on freenode.

-- 
Kalle Vahlman, zuh at iki.fi