Re: Gtk::TreeView

["Rose Cumming" <rose_alice_cumming hotmail com>]

Hello Bob,

Thanks so much. Your code example was very helpful.

Cheers,
Rose

> From: Bob Caryl <bob fis-cal com>
> Reply-To: bob fis-cal com
> To: Rose Cumming <rose_alice_cumming hotmail com>
> CC: gtkmm-list gnome org
> Subject: Re: Gtk::TreeView
> Date: Thu, 02 Feb 2006 05:24:07 -0600
>
> Rose Cumming wrote:
>
> > Hello,
> >
> > I'm new to using Gtk::TreeView.
> > I have a tree view with 2 columns. One column for texts and one column for 
> > a boolean.
> >
> > If I want to perform some functions when the "check box" (for the boolean 
> > value) is checked/unchecked on a certain row, which signal do I use to 
> > connect my signal handler?
> >
> > And if this row has some children rows, is there a way I can find and 
> > iterate through these children rows under the currently selected row?
> >
> > I cannot find any examples around.
> >
> > Any suggestion will be appreciated.
> >
> > Thanks,
> > Rose
> >
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> Hi Rose,
>
> I use the checkbox as a column.  Here's how I do it:
>    // create the check box column
>    tree->append_column_editable("Access", m_columns.m_check);
>    // connect to the cell renderer's "signal_toggled" signal     
> ((Gtk::CellRendererToggle 
> *)tree->get_column_cell_renderer(0))->signal_toggled().connect(sigc::mem_fun(*this, 
> &Menucfg::on_child_toggled));
>
> As for iterating through the tree, whenever a row check box is toggled, I 
> want to do just that, except that I want all descendents *and* ancestors of 
> that row to be checked as well, so here is how I do that:
>
> There are two functions involved:
>
> // this handles both cases, the button was checked, or unchecked.  First it 
> calls
> // check_all_children to handle descendants, then it goes on to handle 
> ancestors
> void Menucfg::on_child_toggled(Glib::ustring str)
> {
>      Gtk::TreeModel::Path path(str.c_str());
>    Gtk::TreeModel::Row row = *(list->get_iter(path));
>    Gtk::TreeModel::Row parent = *(row.parent());
>    Gtk::TreeModel::Children::iterator iter;
>    Gtk::TreeModel::Children children = row.children();
>      if(children)
>        check_all_children(children,row[m_columns.m_check]);
>      if(row[m_columns.m_check])
>    {
>        while(parent)
>        {
>            parent[m_columns.m_check] = true;
>            parent = *(parent.parent());
>        }
>    }
>    else
>    {
>        while(parent)
>        {
>            Gtk::TreeModel::Children siblings = parent.children();
>            for(iter = siblings.begin(); iter != siblings.end(); ++iter)
>            {
>                Gtk::TreeModel::Row child_row = *iter;
>                if(child_row[m_columns.m_check])
>                    break;
>            }
>            parent[m_columns.m_check] = (iter != siblings.end());
>            parent = *(parent.parent());
>        }
>    }
> }
>
> // check_all_children toggles the checked state of all descendants
> // of the current row if there are any.  If it encounters a row that
> // also has descendants, it just recursively calls itself.
> void Menucfg::check_all_children(Gtk::TreeModel::Children& children,bool 
> condition)
> {
>    for(Gtk::TreeModel::Children::iterator iter = children.begin(); iter != 
> children.end(); ++iter)
>    {
>        Gtk::TreeModel::Row child_row = *iter;
>        child_row[m_columns.m_check] = condition;
>        Gtk::TreeModel::Children next = child_row.children();
>        if(next)
>            check_all_children(next,condition);
>    }       }
>
>
> I hope this helps.
>
> Bob Caryl


> << bob.vcf >>

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