treeitemenumerator.cs

Fireball.CodeEditor is an source code editor control derived from the best compona SyntaxBox Control


//    Copyright (C) 2005  Riccardo Marzi <[e-mail]>
//
//    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 2.1 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., 59 Temple Place, Suite 330, Boston, MA  02111-1307  USA

using System;
using System.Collections;
using System.Collections.Generic;
using System.Text;

namespace Fireball.Collections.Generic
{
	public class TreeItemEnumerator<T>:IEnumerator<TreeItem<T>>
	{
		private TreeItem<T> _current;
		private KeyedCollection<TreeItem<T>> _globalCollection;
		private LightCollection<string> _rootItems;

		internal TreeItemEnumerator(ref KeyedCollection<TreeItem<T>> globalCollection,LightCollection<string> rootItems)
		{
			_globalCollection = globalCollection;
			_rootItems = rootItems;
		}

		public void Dispose()
		{
			_current = null;
			_globalCollection.Clear();
			_rootItems.Clear();
		}

		public TreeItem<T> Current
		{
			get { return _current; }
		}
		object IEnumerator.Current
		{
			get { return _current; }
		}

		public void Reset()
		{
			_current = null;
		}

		public bool MoveNext()
		{
			if (_current == null)
			{
				_current = _globalCollection[_rootItems[0]];
				return true;
			}

			TreeItem<T> current = _current.Next;

			if (current != null)
			{
				_current = current;
				return true;
			}

			while (current == null)
			{
				current = _current.Parent;

				if (current == null) return false;

				current = current.Next;
			}

			_current = current;
			return true;

		}
		public bool MovePrevius()
		{
			if (_current == null)
			{
				return false;
			}

			TreeItem<T> current = _current.Previus;

			if (current != null)
			{
				_current = current;
				return true;
			}

			while (current == null)
			{
				current = _current.Parent;

				if (current == null) return false;

				current = current.Next;
			}

			_current = current;
			return true;

		}
		public bool MoveNextSibiling()
		{
			if (_current == null)
			{
				_current = _globalCollection[_rootItems[0]];
				return true;
			}

			TreeItem<T> current = _current.Next;

			if (current != null)
			{
				_current = current;
				return true;
			}
			return false;
		}
		public bool MovePreviusSibiling()
		{
			if (_current == null) return false;

			TreeItem<T> current = _current.Previus;

			if (current != null)
			{
				_current = current;
				return true;
			}
			return false;
		}
		public bool MoveParent()
		{
			if (_current == null) return false;

			TreeItem<T> current = _current.Parent;

			if (current != null)
			{
				_current = current;
				return true;
			}
			return false;
		}
		public bool MoveFirstSibiling()
		{
			if (_current == null)
			{
				_current = _globalCollection[_rootItems[0]];
				return true;
			}

			if (_current.Previus == null) return false;

			TreeItem<T> newCurrent = _current.Previus;
			while (newCurrent != null)
			{
				_current = newCurrent;
				newCurrent = _current.Previus;
			}
			return true;
		}
		public bool MoveLastSibiling()
		{
			if (_current == null)
			{
				_current = _globalCollection[_rootItems[_rootItems.Count - 1]];
				return true;
			}

			if (_current.Next == null) return false;

			TreeItem<T> newCurrent = _current.Next;
			while (newCurrent != null)
			{
				_current = newCurrent;
				newCurrent = _current.Next;
			}
			return true;
		}
		public bool MoveFirstChild()
		{
			if (_current == null)
			{
				_current = _globalCollection[_rootItems[0]];
				return true;
			}

			if (_current.Subitems.Count == 0) return false;

			_current = _current.Subitems[0];
			return true;
		}
		public bool MoveLastChild()
		{
			if (_current == null)
			{
				_current = _globalCollection[_rootItems[_rootItems.Count-1]];
				return true;
			}

			if (_current.Subitems.Count == 0) return false;

			_current = _current.Subitems[_current.Subitems.Count-1];
			return true;
		}
	}
}