86 lines
2 KiB
C#
86 lines
2 KiB
C#
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// TreeEnumerator.cs - .NET-style Enumerator for TreeModel classes
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//
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// Author: Eric Butler <eric@extremeboredom.net>
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//
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// Copyright (c) 2005 Eric Butler
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//
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// This program is free software; you can redistribute it and/or
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// modify it under the terms of version 2 of the Lesser GNU General
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// Public License as published by the Free Software Foundation.
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//
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// This program is distributed in the hope that it will be useful,
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// but WITHOUT ANY WARRANTY; without even the implied warranty of
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// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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// Lesser General Public License for more details.
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//
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// You should have received a copy of the GNU Lesser General Public
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// License along with this program; if not, write to the
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// Free Software Foundation, Inc., 59 Temple Place - Suite 330,
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// Boston, MA 02111-1307, USA.
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using System;
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using System.Collections;
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namespace Gtk
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{
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internal class TreeEnumerator : IEnumerator
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{
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private Gtk.TreeIter iter;
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private Gtk.TreeModel model;
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private bool reset = true;
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private bool changed = false;
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public TreeEnumerator (TreeModel model)
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{
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this.model = model;
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model.RowChanged += model_changed;
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model.RowDeleted += model_changed;
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model.RowInserted += model_changed;
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model.RowsReordered += model_changed;
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}
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public object Current
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{
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get {
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if (reset == false) {
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object[] row = new object[model.NColumns];
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for (int x = 0; x < model.NColumns; x++) {
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row[x] = model.GetValue(iter, x);
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}
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return row;
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} else {
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throw new InvalidOperationException("Enumerator not started.");
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}
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}
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}
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public bool MoveNext()
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{
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if (changed == false) {
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if (reset == true) {
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reset = false;
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return model.GetIterFirst(out iter);
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} else {
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return model.IterNext(ref iter);
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}
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} else {
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throw new InvalidOperationException("List has changed.");
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}
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}
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public void Reset()
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{
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reset = true;
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changed = false;
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}
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private void model_changed(object o, EventArgs args)
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{
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changed = true;
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}
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}
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}
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