Re: Speedup insert into treestore

[muppet <scott asofyet org>]

On Oct 9, 2005, at 1:59 PM, Florian Schaefer wrote:

> OK, how do I do this? I tried to do
>
> $tree_view->set_model(undef)
>
> but that resulted in unusable TreeIters to insert the data into the
> TreeStore. I read that in C one can add a reference to the object  
> so that
> the model doesn't get destroyed, but how is it done in Perl?

Iters are good for the duration of a signal handler or function call,  
and are invalidated by changes to the model.  What you've said  
suggests that you're storing iters, and that's not a valid thing to do.

This is the basic idiom; i've written it for a list, but you can  
expand that to a tree without much difficulty.

   sub repopulate_list {
       my $view = shift;

       my $model = $view->get_model ();

       # unset the model, so that the view doesn't waste time updating
       # itself on every change to the model.  we'll restore it below.
       # typically the main loop won't run between now and then,
       # so there should be no chance for the idle to run and paint
       # an empty list (i.e., typically will not flicker).
       $view->set_model (undef);

       # if the model is sorted, you'd do well to disable sorting, too.
       my $id = $model->get_sort_column_id ();
       $model->set_sort_column_id (-2);


       # now clear and refill the list.
       $model->clear ();
       foreach my $val (@big_list_of_data) {
           $model->append ($model->append, 0, $val);
       }


       # re-enable sorting
       $model->set_sort_column_id ($id);

       # restore the model; this will redraw the whole thing.
       $view->set_model ($model);
   }



--
To me, "hajime" means "the man standing opposite you is about to hit  
you with a stick".
  -- Ian Malpass, speaking of the Japanese word for "the beginning"