Re: Switch a CellRendererCombo's model

[Daniel Kasak <dkasak nusconsulting com au>]

muppet wrote:

> On Jul 4, 2005, at 11:50 PM, Daniel Kasak wrote:
>
> > I'm having a really, *really* bad performance problem in a treeview 
> > that
> > has a CellRendererCombo with a large model.
>
> How bad?

:)

Oh ... it's pretty bad. The model has locations and postcodes ( zip
codes ), and there are 15,000 of them in the table. If I populate a
TreeModel / TreeView with 15 records and use the postcodes model in one
of the cells, it takes about 5 seconds of 100% CPU usage just to draw
the TreeView. Other events:

- resize the TreeView - 5 seconds at 100% CPU
- click in a row - 2 second delay, CPU at 100%
- edit data in a cell - 3 to 4 second delay, CPU at 100%
- switch to another desktop and back - 5 second delay, CPU at 50%
- point mouse in general direction of TreeView, with small movements,
CPU constantly at 15%

> > Is there any way around this?
>
> Store the appropriate combo model for each row in an extra column in 
> the main treemodel, and use an attribute on the TreeViewColumn to 
> tell the CellRendererCombo where to find the model.  Since this has 
> potential to use obscene amounts of memory, you'll want to share 
> models between rows.

That sounds like what I want, but I'm a little unclear on how to get
there. At the moment, I'm setting the model with:

---

$renderer = Gtk2::CellRendererCombo->new;

$renderer->set(
            editable    => TRUE,
            model       => $field->{model},
            text_column => 1,
            has_entry   => TRUE
);

$renderer->{column} = $column_no;

$self->{columns}[$column_no] = Gtk2::TreeViewColumn->new_with_attributes(
            $field->{name},
            $renderer,
            text    => $column_no
);

---

So in my $renderer->set() line, I'd remove the model => $field->{model}
bit. And I'd replace it with something in the above
Gtk2::TreeViewColumn->new_with_attributed() line? Assuming I have packed
a model into column $combo_model_column in the main TreeModel, how do I
tell the CellRendererCombo to use it?

-- 
Daniel Kasak
IT Developer
NUS Consulting Group
Level 5, 77 Pacific Highway
North Sydney, NSW, Australia 2060
T: (+61) 2 9922-7676 / F: (+61) 2 9922 7989
email: dkasak nusconsulting com au
website: http://www.nusconsulting.com.au