Re: Queries on tree items and signals

[Torsten Schoenfeld <kaffeetisch gmx de>]

On Tue, 2005-03-08 at 12:39 +0530, rashwin wrote:

> I am new to the list and I have a couple of queries on the following:

Welcome.

> $::button_ok->signal_handlers_destroy();
> $::button_cancel->signal_handlers_destroy();

The fact that this worked for you without causing an error, means that
you're using the old and obsolete gtk+ 1.0 bindings, Gtk.  You
shouldn't.  Use the new and shiny gtk+ 2.0 bindings, Gtk2.

With Gtk2 you'd do something like this to achieve what you want:

  Gtk2 -> init();

  my $w = Gtk2::Window -> new;
  my $b = Gtk2::Button -> new("Zoink");

  doit();

  $w -> add($b);
  $w -> show_all();

  Gtk2 -> main();

  sub doit {
    my $id = 0 if 0;
    $b -> signal_handler_disconnect($id) if ($id);
    $id = $b -> signal_connect(clicked => \&doit);
  }


> $::button_ok->signal_connect( 'clicked', \&type_direct_apply,$tree,$::external_text,$help_text);
>
> $::button_cancel->signal_connect( 'clicked', \&type_sample_cancel,$tree, $::external_text,$help_text );

In Gtk2, we don't allow more than one user data parameter anymore, so
make that:

  $::button_ok->signal_connect( 'clicked', \&type_direct_apply, [$tree,$::external_text,$help_text]);

  sub type_direct_apply {                                                       
    my ($button, $data) = @_;
    my ($tree, $external, $help) = @$data;

    # ...
  }

> 2. THis is on dynamically changing labels of tree items.
> When you create a tree item the first time and when selecting that tree item,
> I want the user to change the label of the tree item on the fly.
> Is that possible? What commands to be used for the same?

Gtk2 makes this very easy for you.  Just make the cell renderer
editable, and listen to the "edited" signal:

  $renderer -> set(editable => TRUE);
  $renderer -> signal_connect(edited => sub {
    my ($renderer, $path, $new) = @_;

    # $path contains the stringified tree path of the changed row
    # $new contains the newly entered string

    # If you want to keep the changes, you can store $new in the model 
    # now.  If you do nothing, the change will be discarded.
  }

-- 
Bye,
-Torsten