Code:
/ DotNET / DotNET / 8.0 / untmp / whidbey / REDBITS / ndp / fx / src / xsp / System / Web / UI / WebControls / TreeNodeCollection.cs / 1 / TreeNodeCollection.cs
namespace System.Web.UI.WebControls { using System; using System.Collections; using System.Collections.Generic; using System.ComponentModel; using System.Globalization; using System.Text; using System.Web.UI; using System.Security.Permissions; [AspNetHostingPermission(SecurityAction.LinkDemand, Level=AspNetHostingPermissionLevel.Minimal)] public sealed class TreeNodeCollection : ICollection, IStateManager { private List_list; private TreeNode _owner; private bool _updateParent; private int _version; private bool _isTrackingViewState; private List _log; public TreeNodeCollection() : this(null, true) { } public TreeNodeCollection(TreeNode owner) : this(owner, true) { } internal TreeNodeCollection(TreeNode owner, bool updateParent) { _owner = owner; _list = new List (); _updateParent = updateParent; } public int Count { get { return _list.Count; } } public bool IsSynchronized { get { return ((ICollection)_list).IsSynchronized; } } private List Log { get { if (_log == null) { _log = new List (); } return _log; } } public object SyncRoot { get { return ((ICollection)_list).SyncRoot; } } public TreeNode this[int index] { get { return _list[index]; } } public void Add(TreeNode child) { AddAt(Count, child); } public void AddAt(int index, TreeNode child) { if (child == null) { throw new ArgumentNullException("child"); } if (_updateParent) { if (child.Owner != null && child.Parent == null) { child.Owner.Nodes.Remove(child); } if (child.Parent != null) { child.Parent.ChildNodes.Remove(child); } if (_owner != null) { child.SetParent(_owner); child.SetOwner(_owner.Owner); } } _list.Insert(index, child); _version++; if (_isTrackingViewState) { ((IStateManager)child).TrackViewState(); child.SetDirty(); } Log.Add(new LogItem(LogItemType.Insert, index, _isTrackingViewState)); } public void Clear() { if (this.Count == 0) return; if (_owner != null) { TreeView owner = _owner.Owner; if (owner != null) { // Clear checked nodes if necessary if (owner.CheckedNodes.Count != 0) { owner.CheckedNodes.Clear(); } TreeNode current = owner.SelectedNode; // Check if the selected item is under this collection while (current != null) { if (this.Contains(current)) { owner.SetSelectedNode(null); break; } current = current.Parent; } } } foreach (TreeNode node in _list) { node.SetParent(null); } _list.Clear(); _version++; if (_isTrackingViewState) { // Clearing invalidates all previous log entries, so we can just clear them out and save some space Log.Clear(); } Log.Add(new LogItem(LogItemType.Clear, 0, _isTrackingViewState)); } public void CopyTo(TreeNode[] nodeArray, int index) { ((ICollection)this).CopyTo(nodeArray, index); } public bool Contains(TreeNode c) { return _list.Contains(c); } internal TreeNode FindNode(string[] path, int pos) { if (pos == path.Length) { return _owner; } string pathPart = TreeView.UnEscape(path[pos]); for (int i = 0; i < Count; i++) { TreeNode node = this[i]; if (node.Value == pathPart) { return node.ChildNodes.FindNode(path, pos + 1); } } return null; } public IEnumerator GetEnumerator() { return new TreeNodeCollectionEnumerator(this); } public int IndexOf(TreeNode value) { return _list.IndexOf(value); } public void Remove(TreeNode value) { if (value == null) { throw new ArgumentNullException("value"); } int index = _list.IndexOf(value); if (index != -1) { RemoveAt(index); } } public void RemoveAt(int index) { TreeNode node = _list[index]; if (_updateParent) { TreeView owner = node.Owner; if (owner != null) { if (owner.CheckedNodes.Count != 0) { // We have to scan the whole tree of subnodes to remove any checked nodes // (and unselect the selected node if it is a descendant). // That could badly hurt performance, except that removing a node is a pretty // exceptional event. UnCheckUnSelectRecursive(node); } else { // otherwise, we can just climb the tree up from the selected node // to see if it is a descendant of the removed node. TreeNode current = owner.SelectedNode; // Check if the selected item is under this collection while (current != null) { if (current == node) { owner.SetSelectedNode(null); break; } current = current.Parent; } } } node.SetParent(null); } _list.RemoveAt(index); _version++; Log.Add(new LogItem(LogItemType.Remove, index, _isTrackingViewState)); } internal void SetDirty() { foreach (LogItem item in Log) { item.Tracked = true; } for (int i = 0; i < Count; i++) { this[i].SetDirty(); } } private static void UnCheckUnSelectRecursive(TreeNode node) { TreeNodeCollection checkedNodes = node.Owner.CheckedNodes; if (node.Checked) { checkedNodes.Remove(node); } TreeNode selectedNode = node.Owner.SelectedNode; if (node == selectedNode) { node.Owner.SetSelectedNode(null); selectedNode = null; } // Only recurse if there could be some more work to do if (selectedNode != null || checkedNodes.Count != 0) { foreach (TreeNode child in node.ChildNodes) { UnCheckUnSelectRecursive(child); } } } #region ICollection implementation void ICollection.CopyTo(Array array, int index) { if (!(array is TreeNode[])) { throw new ArgumentException(SR.GetString(SR.TreeNodeCollection_InvalidArrayType), "array"); } _list.CopyTo((TreeNode[])array, index); } #endregion #region IStateManager implementation /// bool IStateManager.IsTrackingViewState { get { return _isTrackingViewState; } } /// void IStateManager.LoadViewState(object state) { object[] nodeState = (object[])state; if (nodeState != null) { if (nodeState[0] != null) { string logString = (string)nodeState[0]; // Process each log entry string[] items = logString.Split(','); for (int i = 0; i < items.Length; i++) { string[] parts = items[i].Split(':'); LogItemType type = (LogItemType)Int32.Parse(parts[0], CultureInfo.InvariantCulture); int index = Int32.Parse(parts[1], CultureInfo.InvariantCulture); if (type == LogItemType.Insert) { if (_owner != null && _owner.Owner != null) { AddAt(index, _owner.Owner.CreateNode()); } else { AddAt(index, new TreeNode()); } } else if (type == LogItemType.Remove) { RemoveAt(index); } else if (type == LogItemType.Clear) { Clear(); } } } for (int i = 0; i < nodeState.Length - 1; i++) { if ((nodeState[i + 1] != null) && (this[i] != null)) { ((IStateManager)this[i]).LoadViewState(nodeState[i + 1]); } } } } /// object IStateManager.SaveViewState() { object[] nodes = new object[Count + 1]; bool hasViewState = false; if ((_log != null) && (_log.Count > 0)) { // Construct a string representation of the log, delimiting entries with commas // and seperator command and index with a colon StringBuilder builder = new StringBuilder(); int realLogCount = 0; for (int i = 0; i < _log.Count; i++) { LogItem item = _log[i]; if (item.Tracked) { builder.Append((int)item.Type); builder.Append(":"); builder.Append(item.Index); if (i < (_log.Count - 1)) { builder.Append(","); } realLogCount++; } } if (realLogCount > 0) { nodes[0] = builder.ToString(); hasViewState = true; } } for (int i = 0; i < Count; i++) { nodes[i + 1] = ((IStateManager)this[i]).SaveViewState(); if (nodes[i + 1] != null) { hasViewState = true; } } return (hasViewState ? nodes : null); } /// void IStateManager.TrackViewState() { _isTrackingViewState = true; for (int i = 0; i < Count; i++) { ((IStateManager)this[i]).TrackViewState(); } } #endregion /// /// Convenience class for storing and using log entries. /// private class LogItem { private LogItemType _type; private int _index; private bool _tracked; public LogItem(LogItemType type, int index, bool tracked) { _type = type; _index = index; _tracked = tracked; } public int Index { get { return _index; } } public bool Tracked { get { return _tracked; } set { _tracked = value; } } public LogItemType Type { get { return _type; } } } ////// Convenience enumeration for identifying log commands /// private enum LogItemType { Insert = 0, Remove = 1, Clear = 2 } // This is a copy of the ArrayListEnumeratorSimple in ArrayList.cs private class TreeNodeCollectionEnumerator : IEnumerator { private TreeNodeCollection list; private int index; private int version; private TreeNode currentElement; internal TreeNodeCollectionEnumerator(TreeNodeCollection list) { this.list = list; this.index = -1; version = list._version; } public bool MoveNext() { if (version != list._version) throw new InvalidOperationException(SR.GetString(SR.ListEnumVersionMismatch)); if (index < (list.Count - 1)) { index++; currentElement = list[index]; return true; } else index = list.Count; return false; } object IEnumerator.Current { get { return Current; } } public TreeNode Current { get { if (index == -1) throw new InvalidOperationException(SR.GetString(SR.ListEnumCurrentOutOfRange)); if (index >= list.Count) throw new InvalidOperationException(SR.GetString(SR.ListEnumCurrentOutOfRange)); return currentElement; } } public void Reset() { if (version != list._version) throw new InvalidOperationException(SR.GetString(SR.ListEnumVersionMismatch)); currentElement = null; index = -1; } } } }
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