using System;

using System.Collections.Generic;

using System.Text;

namespace Aga.Controls.Tree

{

	public abstract class TreeModelBase: ITreeModel

	{

		public abstract System.Collections.IEnumerable GetChildren(TreePath treePath);

		public abstract bool IsLeaf(TreePath treePath);

		public event EventHandler<TreeModelEventArgs> NodesChanged;

		protected void OnNodesChanged(TreeModelEventArgs args)

		{

			if (NodesChanged != null)

				NodesChanged(this, args);

		}

		public event EventHandler<TreePathEventArgs> StructureChanged;

		protected void OnStructureChanged(TreePathEventArgs args)

		{

			if (StructureChanged != null)

				StructureChanged(this, args);

		}

		public event EventHandler<TreeModelEventArgs> NodesInserted;

		protected void OnNodesInserted(TreeModelEventArgs args)

		{

			if (NodesInserted != null)

				NodesInserted(this, args);

		}

		public event EventHandler<TreeModelEventArgs> NodesRemoved;

		protected void OnNodesRemoved(TreeModelEventArgs args)

		{

			if (NodesRemoved != null)

				NodesRemoved(this, args);

		}

		public virtual void Refresh()

		{

			OnStructureChanged(new TreePathEventArgs(TreePath.Empty));

		}

	}

}