Re: AW: Attach invisible data to a TreeRow?

[Marco <mscholtn xs4all nl>]

On Fri, 16 Dec 2005 22:26:18 +0100, Daniel Kraft <d daniel-kraft net>  
wrote:

> Hi!
>
> I thought about a solution like that for one of my projects some time  
> ago:
>
> > Just add a column to your modelcolumns but don't append a column for  
> > that
> > to your treeview.
> > Here are some code fragments where i do this in my project.
> >
> >      //Tree model columns:
> >      class PageListModelColumns : public Gtk::TreeModel::ColumnRecord
> >      {
> >      public:
> >          PageListModelColumns()
> >          { add(m_col_name); add(m_col_page); }
> >
> >          Gtk::TreeModelColumn<Glib::ustring> m_col_name;
> >          Gtk::TreeModelColumn<DialogPage*> m_col_page;
> >      };
> >      PageListModelColumns m_PageListColumns;
> >
> >
> >      //Add the TreeView's view columns:
> >      m_pPagelist->append_column("Name", m_PageListColumns.m_col_name);
> >      //m_pPagelist is a treeview
>
> But I was wondering how to delete the DialogPage-objects when the row is
> deleted. Do I have to keep track of when the row is deleted at my own or  
> are
> there ways to do such a clean-up, for instance, like if it was done in  
> the
> TreeRow's destructor? So can I define some code to clean up which is
> automatically called whenever the TreeRow is destructed?
>
> Yours,
> Daniel Kraft

You can use a smart pointer for that, like Glib::RefPtr .

http://www.gtkmm.org/docs/glibmm-2.4/docs/reference/html/classGlib_1_1RefPtr.html
http://www.gtkmm.org/docs/gtkmm-2.4/docs/tutorial/html/ch18s02.html

--
Marco