ObjectListItemCollection.cs source code in C# .NET

                        Code:
                         / 4.0 / 4.0 / untmp / DEVDIV_TFS / Dev10 / Releases / RTMRel / ndp / fx / src / MIT / System / Web / UI / MobileControls / ObjectListItemCollection.cs / 1305376 / ObjectListItemCollection.cs
                        
                        
                            //------------------------------------------------------------------------------ 
// 
//     Copyright (c) Microsoft Corporation.  All rights reserved.
// 
//----------------------------------------------------------------------------- 

using System; 
using System.ComponentModel; 
using System.Collections;
using System.Diagnostics; 
using System.Web;
using System.Web.UI;
using System.Security.Permissions;
 
namespace System.Web.UI.MobileControls
{ 
 
    /*
     * Object List Item collection class. Does not derive from MobileListItemCollection, 
     * because much of the functionality there is disallowed here.
     *
     * Copyright (c) 2000 Microsoft Corporation
     */ 

    ///  
    [AspNetHostingPermission(SecurityAction.LinkDemand, Level=AspNetHostingPermissionLevel.Minimal)] 
    [AspNetHostingPermission(SecurityAction.InheritanceDemand, Level=AspNetHostingPermissionLevel.Minimal)]
    [Obsolete("The System.Web.Mobile.dll assembly has been deprecated and should no longer be used. For information about how to develop ASP.NET mobile applications, see http://go.microsoft.com/fwlink/?LinkId=157231.")] 
    public class ObjectListItemCollection : ArrayListCollectionBase, IStateManager
    {
        private bool _marked = false;
        private bool _dirty = false; 
        private ObjectList _owner;
        private int _baseIndex = 0; 
 
        internal ObjectListItemCollection(ObjectList owner)
        { 
            _owner = owner;
        }

        internal int BaseIndex 
        {
            get 
            { 
                return _baseIndex;
            } 

            set
            {
                _baseIndex = value; 
            }
        } 
 
        /// 
        public ObjectListItem[] GetAll() 
        {
            int n = Count;
            ObjectListItem[] result = new ObjectListItem[n];
            if (n > 0) 
            {
                Items.CopyTo (0, result, 0, n); 
            } 
            return result;
        } 

        /// 
        public ObjectListItem this[int index]
        { 
            get
            { 
                return (ObjectListItem)Items[index]; 
            }
        } 

        internal void Add(ObjectListItem item)
        {
            Items.Add (item); 
            if (_marked)
            { 
                _dirty = true; 
                item.Dirty = true;
            } 
        }

        /// 
        public void Clear() 
        {
            Items.Clear (); 
            if (_marked) 
            {
                _dirty = true; 
            }
        }

        ///  
        public bool Contains(ObjectListItem item)
        { 
            return Items.Contains (item); 
        }
 
        /// 
        public int IndexOf(ObjectListItem item)
        {
            return Items.IndexOf(item); 
        }
 
        ///////////////////////////////////////////////////////////////////////// 
        //  STATE MANAGEMENT
        ///////////////////////////////////////////////////////////////////////// 

        /// 
        protected bool IsTrackingViewState
        { 
            get
            { 
                return _marked; 
            }
        } 

        /// 
        protected void TrackViewState()
        { 
            _marked = true;
            foreach (IStateManager item in Items) 
            { 
                item.TrackViewState();
            } 
        }

        /// 
        protected void LoadViewState(Object state) 
        {
            if (state != null) 
            { 
                Object[] changes = (Object[])state;
                Debug.Assert (changes.Length == 2); 
                if (changes[0] == null)
                {
                    Clear ();
                } 
                else
                { 
                    Object[] itemChanges = (Object[])changes[0]; 
                    EnsureCount (itemChanges.Length);
                    int i = 0; 
                    foreach (IStateManager item in Items)
                    {
                        item.LoadViewState (itemChanges[i++]);
                    } 
                }
 
                int oldBaseIndex = BaseIndex; 
                BaseIndex = (int)changes[1];
                if (oldBaseIndex != BaseIndex) 
                {
                    int index = BaseIndex;
                    foreach (ObjectListItem item in Items)
                    { 
                        item.SetIndex(index++);
                    } 
                } 
            }
        } 

        /// 
        protected Object SaveViewState()
        { 
            if (!_dirty)
            { 
                return null; 
            }
 
            Object[] itemChanges;
            if (Count > 0)
            {
                itemChanges = new Object[Count]; 
                int i = 0;
                foreach (IStateManager item in Items) 
                { 
                    itemChanges[i++] = item.SaveViewState ();
                } 
            }
            else
            {
                itemChanges = null; 
            }
 
            if (itemChanges == null && BaseIndex == 0) 
            {
                return null; 
            }
            else
            {
                return new Object[2] { itemChanges, BaseIndex }; 
            }
        } 
 
        private void EnsureCount(int count)
        { 
            int diff = Count - count;
            if (diff > 0)
            {
                Items.RemoveRange (count, diff); 
                if (_marked)
                { 
                    _dirty = true; 
                }
            } 
            else
            {
                for (int i = Count; i < count; i++)
                { 
                    ObjectListItem item = new ObjectListItem(_owner);
                    item.SetIndex(i + BaseIndex); 
                    Add (item); 
                }
            } 
        }

        #region Implementation of IStateManager
        ///  
        bool IStateManager.IsTrackingViewState {
            get { 
                return IsTrackingViewState; 
            }
        } 

        /// 
        void IStateManager.LoadViewState(object state) {
            LoadViewState(state); 
        }
 
        ///  
        void IStateManager.TrackViewState() {
            TrackViewState(); 
        }

        /// 
        object IStateManager.SaveViewState() { 
            return SaveViewState();
        } 
        #endregion 
    }
} 


// File provided for Reference Use Only by Microsoft Corporation (c) 2007.
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ObjectListItemCollection.cs source code in C# .NET

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