MenuItemCollection.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / xsp / System / Web / UI / WebControls / MenuItemCollection.cs / 1305376 / MenuItemCollection.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; 

    public sealed class MenuItemCollection : ICollection, IStateManager { 
        private List _list;
        private MenuItem _owner;
        private int _version;
 
        private bool _isTrackingViewState;
 
        private List _log; 

 
        public MenuItemCollection() : this(null) {
        }

 
        public MenuItemCollection(MenuItem owner) {
            _owner = owner; 
            _list = new List(); 
        }
 

        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 MenuItem this[int index] {
            get { 
                return _list[index]; 
            }
        } 


        public void Add(MenuItem child) {
            AddAt(_list.Count, child); 
        }
 
 
        public void AddAt(int index, MenuItem child) {
            if (child == null) { 
                throw new ArgumentNullException("child");
            }

            if (child.Owner != null && child.Parent == null) { 
                child.Owner.Items.Remove(child);
            } 
            if (child.Parent != null) { 
                child.Parent.ChildItems.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) {
                Menu owner = _owner.Owner;
                if (owner != null) { 
                    MenuItem current = owner.SelectedItem;
                    // Check if the selected item is under this collection 
                    while (current != null) { 
                        if (this.Contains(current)) {
                            owner.SetSelectedItem(null); 
                            break;
                        }
                        current = current.Parent;
                    } 
                }
            } 
            foreach (MenuItem item in _list) { 
                item.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(Array array, int index) {
            if (!(array is MenuItem[])) {
                throw new ArgumentException(SR.GetString(SR.MenuItemCollection_InvalidArrayType), "array"); 
            }
            _list.CopyTo((MenuItem[])array, index); 
        } 

 
        public void CopyTo(MenuItem[] array, int index) {
            _list.CopyTo(array, index);
        }
 

        public bool Contains(MenuItem c) { 
            return _list.Contains(c); 
        }
 
        internal MenuItem FindItem(string[] path, int pos) {
            if (pos == path.Length) {
                return _owner;
            } 

            string pathPart = TreeView.UnEscape(path[pos]); 
            for (int i = 0; i < Count; i++) { 
                MenuItem node = _list[i];
                if (node.Value == pathPart) { 
                    return node.ChildItems.FindItem(path, pos + 1);
                }
            }
 
            return null;
        } 
 

        public IEnumerator GetEnumerator() { 
            return new MenuItemCollectionEnumerator(this);
        }

 
        public int IndexOf(MenuItem value) {
            return _list.IndexOf(value); 
        } 

 
        public void Remove(MenuItem value) {
            if (value == null) {
                throw new ArgumentNullException("value");
            } 

            int index = _list.IndexOf(value); 
            if (index != -1) { 
                RemoveAt(index);
            } 
        }


        public void RemoveAt(int index) { 
            MenuItem item = _list[index];
            Menu owner = item.Owner; 
            if (owner != null) { 
                MenuItem current = owner.SelectedItem;
                // Check if the selected item is under this item 
                while (current != null) {
                    if (current == item) {
                        owner.SetSelectedItem(null);
                        break; 
                    }
                    current = current.Parent; 
                } 
            }
            item.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();
            } 
        }
 
        #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) {
                            AddAt(index, new MenuItem()); 
                        }
                        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 = (LogItem)_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 MenuItemCollectionEnumerator : IEnumerator {
            private MenuItemCollection list; 
            private int index; 
            private int version;
            private MenuItem currentElement; 

            internal MenuItemCollectionEnumerator(MenuItemCollection 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 MenuItem 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; 
            } 
        }
    } 
}

// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
// Copyright (c) Microsoft Corporation. All rights reserved.
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MenuItemCollection.cs source code in C# .NET

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