Re: [gtkmm] Editable CellRendererText with custom checks

[Murray Cumming <murrayc murrayc com>]

On Sat, 2004-02-28 at 22:10, Roger Leigh wrote:
> Reading from the Gtkmm tutorial (Chapter 8, editable cells), I was
> able to create an editable column using
> Gtk::TreeView::append_column_editable().  However, when I used plain
> append_column() to use my own custom checking callback, like this:
> 
>   m_treeview->set_model(m_tree_store);
>   int view_column = m_treeview->append_column("Title", list_columns.m_col_editable);
>   Gtk::CellRenderer *renderer = m_treeview->get_column_cell_renderer(view_column - 1);
>   Gtk::CellRendererText *text_renderer = dynamic_cast<Gtk::CellRendererText *>(renderer);
>   if (text_renderer)
>     {
>       text_renderer->signal_edited().connect
> 	( SigC::slot(*this, &editable_treeview::on_edited) );
>     }
> 
> This doesn't do anything (the cell isn't editable) unless I add
> 
>       text_renderer->property_editable() = true;
> 
> to the "if" block.  This isn't mentioned in the tutorial, so I'm not
> sure if it's necessary.  Am I missing something here, or is this
> required?

I don't understand. What were you trying to do? The book mentions that
you need to use append_column_editable() to get editable columns, so
it's natural to think that it won't be editable if you just use
append_column().

Note that it takes more than property_editable()=true to make the cell
really editable, as you can see in the implementation for
append_column_editable() - you need to respond to an appropriate signal
and put the new value into the model.
 
-- 
Murray Cumming
www.murrayc.com
murrayc murrayc com