RE: Restoring a List View's position

[Jeff Hallock <Jhallock WBandA com>]

Is there a reason not to actually just have different tree view widgets created? You could pack them all into 
a vbox - and then call show/hide on the appropriate widgets when changing views. This is how I approach this 
type of problem. The displaying and hiding of the widgets is seamless on my system.

> -----Original Message-----
> From: gtk-perl-list-bounces gnome org [mailto:gtk-perl-list-
> bounces gnome org] On Behalf Of Matthew Braid
> Sent: Monday, March 16, 2009 2:59 AM
> To: gtk-perl-list gnome org List
> Subject: Restoring a List View's position
>
> Hi all,
>
> Been scratching my head over this too long, so I thought I'd ask the list.
>
> I have a TreeView that is shared amongst several virtual views. If the
> user changes from one virtual view to another the tree view is cleared
> and shows the contents of the new virtual view. So far so good.
>
> However, I want the tree view to act as much as possible like there
> are really multiple tree views. To do this I need to store the
> selection paths, sort column id etc etc and restore them again. This
> has gone swimmingly except for storing and restoring the tree view's
> current display position.
>
> I initially tried using $treeview->get_visible_range and
> $treeview->scroll_to_cell, but get_visible_range seems to be a little
> flakey on my system and often aborts with a message about some
> assertion failing (something != nil I think). So after realising that
> eval {} over a failed Gtk assertion just doesn't work (yay), I tried
> directly manipulating the scrollbars instead.
>
> On store, I do this:
>
> $store{POS} = $list->get_vadjustment->get_value;
>
> and on restore I:
>
> $list->get_vadjustment->set_value($store{POS});
>
> This doesn't error, but it also doesn't do anything - scrollbar
> steadfastly stays where it is.
>
> I starting looking into storing the coords of the currently visible
> cells and using scroll_to_point, but now I'm dealing with screen
> coordinates and that seems a bit low level for what should simply be
> 'scroll to this entry in the list'.
>
> What is it that I'm missing?
>
> Thanks in advance,
> MB
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