Re: Possible row selection interfering with Update

[muppet <scott asofyet org>]

On Apr 9, 2010, at 7:26 PM, Zettai Muri wrote:

> > You're changing the selection mode on the first update.  By moving the $treeselect->set_mode('single') 
> > line from update_line() to init(), i could no longer get the "first time it acts weird" behavior.  
> > Doubtless, changing the mode causes the iter to be different.
>
> Thank you for this, however I was hoping to also make it possible for the user to select and delete 
> multiple rows.
> Any recommendations on how to provide this functionality while avoiding the first update behaviour?

Leave the view in multiple selection mode, and use this instead of get_selected():

   @paths = $selection->get_selected_rows
       Returns the Gtk2::TreePath of each selected row, or an empty list if no
       rows are selected.  The model is not returned, as documented in the C
       API reference.  To get the model, try
       "$selection->get_tree_view->get_model".

So your selection changed code would be

    my @paths = $selection->get_selected_rows ();

    if (@paths == 1) {
        # exactly one selected, display it
        display_row (...);

    } else {
        # either multiple rows selected, or nothing selected.
        # clear the display.
        undisplay (...);
    }
    # or you might want to allow modifying multiple elements
    # at once, so you'd treat @path == 0 and @path > 1 differently

and then the delete key handler would look like this (untested!):

    my $model = $selection->get_tree_view->get_model;

    foreach my $path (reverse $selection->get_selected_rows ()) {
        $model->remove ($model->get_iter ($path));
    }



> > After moving the tree selection setup to init, you may be interested in using the two-return form of 
> > get_selection() and adding error checking:
> >
> >   my ($model, $iter) = $treeselection->get_selected;
> >   return unless $iter;
>
> In update_line() I have done the following:
>
>    # Get selected line number
>    my ($model, $iter) = $treeselection->get_selected;
>    return unless $iter;
>
>    #my $model = $tv_items->get_model;
>    #my $iter = $treeselection->get_selected;
>
> However, now no update occurs.  How should I be implementing this?

Did you set the selection mode at initialization?


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