RE: liststore update question

["Brian" <bmcandrews efs-us com>]

Thanks,
Would storing TreeRowReference's be faster than
using:

    my $iter = $model->get_iter_first;
    while (defined $iter)
     {
       ....
       $iter = $model->iter_next($iter);
     }
-----Original Message-----
From: gtk-perl-list-admin gnome org
[mailto:gtk-perl-list-admin gnome org] On Behalf Of muppet
Sent: Monday, March 29, 2004 3:25 PM
To: gtk-perl-list gnome org
Subject: Re: liststore update question



B McAndrews said:
> I have liststore setup with an appropriate view. The model was 
> initially set with data from database.  I can get updates from the 
> database, but I'm unsure as to how I go about updating the model and 
> subsequently the view.  Rows won't be added or deleted, so I thought 
> of something I could cache the iterators that were created at 
> initialization, but I'm not sure that would work.  Can anyone  help me

> here?

The iters are not guaranteed long lifetimes, so you do not want to cache
them.  Instead, you'd use a Gtk2::TreeRowReference, which is guaranteed
to point to the right place, even if the data in the list changes, so
long as the row exists.

http://developer.gnome.org/doc/API/2.0/gtk/GtkTreeModel.html#gtk-tree-ro
w-reference-new
and http://gtk2-perl.sourceforge.net/doc/pod/Gtk2/TreeRowReference.html


After that, as far as i know, when you do

  $model->set ($iter, COL1 $val1, COL2, $val2, ...);

the view should update automatically, with no intervention from you.  In
fact, i've been looking for a way to freeze/thaw the liststore during
large updates; i think $object->freeze_notify and thaw_notify are
supposed to work here.

-- 
muppet <scott at asofyet dot org>
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