OpenHardwareMonitor-retired: External/Aga.Controls/Tree/TreeModel.cs@5715aefd2bcc

     1 using System;

     2 using System.Collections.Generic;

     3 using System.Text;

     4 using System.Collections.ObjectModel;

     6 namespace Aga.Controls.Tree

7 {

     8 	/// <summary>

     9 	/// Provides a simple ready to use implementation of <see cref="ITreeModel"/>. Warning: this class is not optimized

    10 	/// to work with big amount of data. In this case create you own implementation of <c>ITreeModel</c>, and pay attention

    11 	/// on GetChildren and IsLeaf methods.

    12 	/// </summary>

    13 	public class TreeModel : ITreeModel

    14 	{

    15 		private Node _root;

    16 		public Node Root

    17 		{

    18 			get { return _root; }

    19 		}

    21 		public Collection<Node> Nodes

    22 		{

    23 			get { return _root.Nodes; }

    24 		}

    26 		public TreeModel()

    27 		{

    28 			_root = new Node();

    29 			_root.Model = this;

    30 		}

    32 		public TreePath GetPath(Node node)

    33 		{

    34 			if (node == _root)

    35 				return TreePath.Empty;

    36 			else

    37 			{

    38 				Stack<object> stack = new Stack<object>();

    39 				while (node != _root)

    40 				{

    41 					stack.Push(node);

    42 					node = node.Parent;

    43 				}

    44 				return new TreePath(stack.ToArray());

    45 			}

    46 		}

    48 		public Node FindNode(TreePath path)

    49 		{

    50 			if (path.IsEmpty())

    51 				return _root;

    52 			else

    53 				return FindNode(_root, path, 0);

    54 		}

    56 		private Node FindNode(Node root, TreePath path, int level)

    57 		{

    58 			foreach (Node node in root.Nodes)

    59 				if (node == path.FullPath[level])

    60 				{

    61 					if (level == path.FullPath.Length - 1)

    62 						return node;

    63 					else

    64 						return FindNode(node, path, level + 1);

    65 				}

    66 			return null;

    67 		}

    69 		#region ITreeModel Members

    71 		public System.Collections.IEnumerable GetChildren(TreePath treePath)

    72 		{

    73 			Node node = FindNode(treePath);

    74 			if (node != null)

    75 				foreach (Node n in node.Nodes)

    76 					yield return n;

    77 			else

    78 				yield break;

    79 		}

    81 		public bool IsLeaf(TreePath treePath)

    82 		{

    83 			Node node = FindNode(treePath);

    84 			if (node != null)

    85 				return node.IsLeaf;

    86 			else

    87 				throw new ArgumentException("treePath");

    88 		}

    90 		public event EventHandler<TreeModelEventArgs> NodesChanged;

    91 		internal void OnNodesChanged(TreeModelEventArgs args)

    92 		{

    93 			if (NodesChanged != null)

    94 				NodesChanged(this, args);

    95 		}

    97 		public event EventHandler<TreePathEventArgs> StructureChanged;

    98 		public void OnStructureChanged(TreePathEventArgs args)

    99 		{

   100 			if (StructureChanged != null)

   101 				StructureChanged(this, args);

   102 		}

   104 		public event EventHandler<TreeModelEventArgs> NodesInserted;

   105 		internal void OnNodeInserted(Node parent, int index, Node node)

   106 		{

   107 			if (NodesInserted != null)

   108 			{

   109 				TreeModelEventArgs args = new TreeModelEventArgs(GetPath(parent), new int[] { index }, new object[] { node });

   110 				NodesInserted(this, args);

   111 			}

   113 		}

   115 		public event EventHandler<TreeModelEventArgs> NodesRemoved;

   116 		internal void OnNodeRemoved(Node parent, int index, Node node)

   117 		{

   118 			if (NodesRemoved != null)

   119 			{

   120 				TreeModelEventArgs args = new TreeModelEventArgs(GetPath(parent), new int[] { index }, new object[] { node });

   121 				NodesRemoved(this, args);

   122 			}

   123 		}

   125 		#endregion

   126 	}

   127 }

author	sl
	Thu, 01 Jan 2015 23:35:49 +0100
changeset 405	5715aefd2bcc
permissions	-rw-r--r--