Re: TreeView path and iter

["Paul Davis" <pjdavis engineering uiowa edu>]

Johnmb,

You can use the TreeSelection to do this.  In the attached example I
only bothered moving the position in a depth first traversal. I assume
you'll be able to figure out how to make traversing down the tree
based on a second button.

Paul


On 12/19/06, johnmb <johnmblackburn googlemail com> wrote:
> John,
>
> > Not exactly sure about the functions you listed, but this is a simple
> > recursive function to find a given row.
>
> >  .....   code snip
>
> >  Its not the best, but it should get the idea acroos.
>
> > Paul
>
> Ah, perhaps I'd better explain more about what I'm trying to do then.
>
> The thing is, I am developing a touch screen menu interface for a machine
> and I am using a single gui button to move the treeview row highlight,  down
> the parent menu items.  Hence, I have to use the button clicked signal to
> move the row highlight down a single row at a time.  At the same time, of
> course I need to check that it has reached the last item and make it wrap
> back to the first item.   I use another button to expand the current row
> into the list of children and move down that.
>
> Hence, it is not JUST the model I am navigating but the treeview as well.
>
> regards
>
> John
> --
> View this message in context: http://www.nabble.com/TreeView-path-and-iter-tf2839301.html#a7943432
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>
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/*
 * This library is free software; you can redistribute it and/or
 * modify it under the terms of the GNU Lesser General Public
 * License as published by the Free Software Foundation; either
 * version 2 of the License, or (at your option) any later version.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
 * Lesser General Public License for more details.
 *
 * You should have received a copy of the GNU Lesser General Public
 * License along with this library; if not, write to the Free Software
 * Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA
 *
 * Author:    Paul Davis pjdavis engineering uiowa edu
 * Copyright: University of Iowa 2006
 *
 * Filename:  tree_movement.cc
 * Created:   2006-Dec-18 02:50:36 PM
 * Modified:  2006-Dec-19 12:04:46 PM
*/

#include <gtkmm.h>

class Editor : public Gtk::Window
{
	public:
	    Editor()
		{
			set_title( "TreeSelection Example" ) ;
			set_size_request( 400, 400 ) ;

			Gtk::VBox* vbox = Gtk::manage( new Gtk::VBox() ) ;
			add( *vbox ) ;

        	mTreeView = Gtk::manage( new Gtk::TreeView() ) ;
			vbox->add( *mTreeView ) ;

			Gtk::Button* button = Gtk::manage( new Gtk::Button( "Move Down" ) ) ;
			button->signal_clicked().connect( sigc::mem_fun( *this, &Editor::on_next_clicked ) ) ;
			vbox->add( *button ) ;

        	mTreeModel = Gtk::TreeStore::create(mTreeColumns);
        	mTreeView->set_model(mTreeModel);
			mTreeSelection = mTreeView->get_selection() ;


        	Gtk::TreeModel::Row root = *(mTreeModel->append());
        	root[mTreeColumns.mNodeName] = "Root";

			Gtk::TreeModel::Row row = *(mTreeModel->append( root->children() ) ) ;
			row[mTreeColumns.mNodeName] = "Child 1" ;

			row = *( mTreeModel->append( root->children() ) ) ;
			row[mTreeColumns.mNodeName] = "Child 2" ;

        	mTreeView->append_column("Nodes", mTreeColumns.mNodeName );

			mTreeSelection->select( root ) ;

			show_all_children() ;
    	}

	private:

		void on_next_clicked()
		{
			Gtk::TreeModel::iterator iter = mTreeSelection->get_selected() ;

			if( !iter )
			{
				iter = mTreeModel->children().begin() ;
				mTreeSelection->select( iter ) ;
				return ;
			}

			Gtk::TreeModel::Row row = *iter ;
			Gtk::TreeModel::Children children = row.children() ;

			if( children.size() > 0 )
			{
				Gtk::TreePath path( iter ) ;
				mTreeView->expand_row( path, false ) ;
				iter = children.begin() ;
				mTreeSelection->select( iter ) ;
				return ;
			}

			Gtk::TreeModel::iterator next = iter ;
			next++ ;

			if( next )
			{
				mTreeSelection->select( next ) ;
				return ;
			}

			Gtk::TreeModel::iterator parent = *(iter)->parent() ;
			next = parent++ ;

			if( next )
			{
				mTreeSelection->select( next ) ;
				return ;
			}

			next = mTreeModel->children().begin() ;
			mTreeSelection->select( next ) ;

			return ;
		}

    	class TreeColumns : public Gtk::TreeModel::ColumnRecord
    	{
    		public:

    			TreeColumns()
    			{
					add(mNodeName);
				}

        		Gtk::TreeModelColumn<Glib::ustring> mNodeName;
    	} ;

    	TreeColumns mTreeColumns;
		Gtk::TreeView* mTreeView ;
    	Glib::RefPtr<Gtk::TreeStore> mTreeModel;
		Glib::RefPtr<Gtk::TreeSelection> mTreeSelection ;
} ;

int
main(int argc, char* argv[])
{
	Gtk::Main kit(argc, argv);

	Editor e ;
	Gtk::Main::run( e );

	return 0;
}