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// TreeEnumerator.cs - .NET-style Enumerator for ITreeModel classes
//
// Author: Eric Butler <eric@extremeboredom.net>
//
// Copyright (c) 2005 Eric Butler
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of version 2 of the Lesser GNU General
// Public License as published by the Free Software Foundation.
//
// This program 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 program; if not, write to the
// Free Software Foundation, Inc., 59 Temple Place - Suite 330,
// Boston, MA 02111-1307, USA.
using System;
using System.Collections;
namespace Gtk
{
internal class TreeEnumerator : IEnumerator
{
private Gtk.TreeIter iter;
private Gtk.ITreeModel model;
private bool reset = true;
private bool changed = false;
public TreeEnumerator (ITreeModel model)
{
this.model = model;
model.RowChanged += new RowChangedHandler (row_changed);
model.RowDeleted += new RowDeletedHandler (row_deleted);
model.RowInserted += new RowInsertedHandler (row_inserted);
model.RowsReordered += new RowsReorderedHandler (rows_reordered);
}
public object Current
{
get {
if (reset == false) {
object[] row = new object[model.NColumns];
for (int x = 0; x < model.NColumns; x++) {
row[x] = model.GetValue(iter, x);
}
return row;
} else {
throw new InvalidOperationException("Enumerator not started.");
}
}
}
public bool MoveNext()
{
if (changed == false) {
if (reset == true) {
reset = false;
return model.GetIterFirst(out iter);
} else {
return model.IterNext(ref iter);
}
} else {
throw new InvalidOperationException("List has changed.");
}
}
public void Reset()
{
reset = true;
changed = false;
}
private void row_changed(object o, RowChangedArgs args)
{
changed = true;
}
private void row_deleted(object o, RowDeletedArgs args)
{
changed = true;
}
private void row_inserted(object o, RowInsertedArgs args)
{
changed = true;
}
private void rows_reordered(object o, RowsReorderedArgs args)
{
changed = true;
}
}
}
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