Re: Problem swapping GtkScrolledWindow contents on the fly

[Tristan Van Berkom <tvb gnome org>]

Ahh you mean it shows up and everything the first time, I see.

I think you are missing a reference to the generalpage widget.

Its initially built as a floating, and then the floating reference is
"sink"ed the first time you add it somewhere, when you remove it
the first time; its destroyed because you dont have a reference.

Cheers,
        -Tristan


On Thu, Dec 24, 2009 at 7:06 PM, Tristan Van Berkom <tvb gnome org> wrote:
> On Thu, Dec 24, 2009 at 6:40 PM, Andrew Wood <ajwood theiet org> wrote:
> > But that bit of code only runs the first time and the first time it works.
> >
> >
> > On 24 Dec 2009, at 19:09, Tristan Van Berkom wrote:
> >
> > > From the assertions it *looks* like glade_xml_get_widget() is
> > > returning NULL for "mainvbox".
>
> You mean "it works" or you mean the code executes and assigns a
> NULL pointer to your widget pointer the first time around ?
>
> From the warnings you printed, 'generalpage' is not a widget,
> so maybe it was not found in the glade file, or maybe it was somehow
> destroyed by some other code fragment in your app along the way.
>
> Cheers,
>        -Tristan
>
> > > Cheers,
> > >      -Tristan
> > >
> > > On Thu, Dec 24, 2009 at 11:29 AM, Andrew Wood <ajwood theiet org> wrote:
> > > > The following function is called to display a vbox, which is read from a
> > > > glade file, in a scrollview.
> > > >
> > > > If the  vbox or 'page' hasnt been displayed before then
> > > > generalpageinitialised will be false.
> > > >
> > > > There are other 'pages' in the app which are vboxes read from a glade
> > > > file
> > > > in the same way. The app always shows the vbox called rightpanevbox and
> > > > it
> > > > swaps this variable to point to the appropriate one read from glade.
> > > >
> > > > The first time the function is called the page shows perfectly. The
> > > > second
> > > > time I get errors such as:
> > > >
> > > > Showing General Page
> > > > doing gtk_container_remove
> > > >
> > > > (a.out:21153): Gtk-CRITICAL **: gtk_container_remove: assertion
> > > > `GTK_IS_WIDGET (widget)' failed
> > > > done gtk_container_remove
> > > >
> > > >
> > > > (a.out:21153): GLib-GObject-WARNING **: invalid unclassed pointer in cast
> > > > to
> > > > `GtkWidget'
> > > >
> > > > (a.out:21153): Gtk-CRITICAL **: gtk_scrolled_window_add_with_viewport:
> > > > assertion `GTK_IS_WIDGET (child)' failed
> > > >
> > > >
> > > > (a.out:21153): GLib-GObject-WARNING **: invalid unclassed pointer in cast
> > > > to
> > > > `GtkWidget'
> > > >
> > > > (a.out:21153): Gtk-CRITICAL **: gtk_widget_show_all: assertion
> > > > `GTK_IS_WIDGET (widget)' failed
> > > >
> > > >
> > > > I cant understand why its happy the first time its called but not on
> > > > subsequent calls. If anyone can enlighten me Id be very grateful
> > > >
> > > > Thanks
> > > >
> > > >
> > > > void showGeneralPage()
> > > > {
> > > >  g_print("Showing General Page\n");
> > > >  if (generalpageinitialised==false)
> > > >  {
> > > >      generalpage= glade_xml_get_widget(generalpagexml,"mainvbox");
> > > >      glade_xml_signal_autoconnect(generalpagexml);
> > > >      generalpageinitialised=true;
> > > >        }
> > > >    if (pagedisplayed!="INIT")
> > > >  {
> > > >     //a previous page is shown so we need to remove it first
> > > >      g_print("doing gtk_container_remove\n");
> > > >      gtk_container_remove (GTK_CONTAINER
> > > > (rightpanescrollview),gtk_bin_get_child(GTK_BIN(rightpanescrollview)));
> > > >      g_print("done gtk_container_remove\n");
> > > >  }
> > > >  rightpanevbox=generalpage; //make generalpage the one currently on show
> > > >  pagedisplayed = "General";
> > > >
> > > >
> > > >
> > > >  gtk_scrolled_window_add_with_viewport(GTK_SCROLLED_WINDOW(rightpanescrollview),GTK_WIDGET(rightpanevbox));
> > > >  gtk_widget_show_all(GTK_WIDGET(rightpanevbox));
> > > > }
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