WatchedList

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using System;
using System.Collections.Generic;
using System.Text;
 
namespace Pulse
{
    /// <summary>
    ///
    /// </summary>
    public enum ListChangedType
    {
        /// <summary>
        ///
        /// </summary>
        Unknown = 0,
        /// <summary>
        ///
        /// </summary>
        Inserted = 1,
        /// <summary>
        ///
        /// </summary>
        Updated = 2,
        /// <summary>
        ///
        /// </summary>
        Deleted = 3,
        /// <summary>
        ///
        /// </summary>
        Cleared = 4
    }
    /// <summary>
    ///
    /// </summary>
    public sealed class ListEventArgs : EventArgs
    {
        /// <summary>
        ///
        /// </summary>
        /// <param name="ListChangedType"></param>
        /// <param name="Index"></param>
        /// <param name="Reference"></param>
        internal ListEventArgs(ListChangedType ListChangedType, int Index, object Reference)
        {
            this.DataStore = new object[3];
            this.DataStore[0] = ListChangedType;
            this.DataStore[1] = Index;
            this.DataStore[2] = Reference;
        }
        /// <summary>
        /// Enthält die durchgeführte Aktion des Ereignisses
        /// </summary>
        public ListChangedType ListChangedType
        {
            get
            {
                return (ListChangedType)this.DataStore[0];
            }
        }
        /// <summary>
        /// Enthält den Index des zum Event gehörenden Elements
        /// -1 bei Clear
        /// </summary>
        public int Index
        {
            get
            {
                return Pulse.Converter.ToInt(this.DataStore[1]);
            }
        }
        /// <summary>
        /// Enthält die Referenz auf das bei der Änderung betroffene Objekt
        /// </summary>
        public object Reference
        {
            get
            {
                return this.DataStore[2];
            }
        }
        /// <summary>
        /// Enthält die Daten
        /// </summary>
        private object[] DataStore;
    }
 
    /// <summary>
    ///
    /// </summary>
    /// <typeparam name="T"></typeparam>
    public sealed class WatchedList<T> : System.Collections.Generic.List<T>
    {
        /// <summary>
        ///
        /// </summary>
        /// <param name="sender"></param>
        /// <param name="e"></param>
        public delegate void ChangedEventHandler(object sender, ListEventArgs e);
        /// <summary>
        ///
        /// </summary>
        public event ChangedEventHandler Changed;
        /// <summary>
        /// Invoke the Changed event; called whenever list changes
        /// </summary>
        /// <param name="e"></param>
        private void OnChanged(ListEventArgs e)
        {
            if (Changed != null) Changed(this, e);
        }
        /// <summary>
        /// Override some of the methods that can change the list;
        /// invoke event after each
        /// </summary>
        /// <param name="item"></param>
        public new void Add(T item)
        {
            base.Add(item);
            this.OnChanged(new ListEventArgs(ListChangedType.Inserted, (base.Count - 1), item));
            return;
        }
        /// <summary>
        ///
        /// </summary>
        public new void Clear()
        {
            base.Clear();
            this.OnChanged(new ListEventArgs(ListChangedType.Cleared,-1, null));
        }
        /// <summary>
        ///
        /// </summary>
        /// <param name="Index"></param>
        /// <returns></returns>
        public new T this[int Index]
        {
            get
            {
                return base[Index];
            }
            set
            {
                base[Index] = value;
                this.OnChanged(new ListEventArgs(ListChangedType.Updated, Index, value));
            }
        }
        /// <summary>
        ///
        /// </summary>
        /// <typeparam name="TOutput"></typeparam>
        /// <param name="converter"></param>
        /// <returns></returns>
        public new Pulse.WatchedList<TOutput> ConvertAll<TOutput>(Converter<T, TOutput> converter)
        {
            Pulse.WatchedList<TOutput> Output = new Pulse.WatchedList<TOutput>();
            foreach (TOutput Element in base.ConvertAll<TOutput>(converter)) Output.Add(Element);
            return Output;
        }
        /// <summary>
        ///
        /// </summary>
        /// <param name="item"></param>
        public new void Remove(T item)
        {
            int Index = base.IndexOf(item);
            base.RemoveAt(Index);
            this.OnChanged(new ListEventArgs(ListChangedType.Deleted, Index, item));
        }
        /// <summary>
        ///
        /// </summary>
        /// <param name="Index"></param>
        public new void RemoveAt(int Index)
        {
            T Temp = this[Index];
            base.RemoveAt(Index);
            this.OnChanged(new ListEventArgs(ListChangedType.Deleted, Index, Temp));
        }
        /// <summary>
        ///
        /// </summary>
        /// <param name="Index"></param>
        /// <param name="item"></param>
        public new void Insert(int Index, T item)
        {
            base.Insert(Index, item);
            this.OnChanged(new ListEventArgs(ListChangedType.Inserted, Index, item));
        }
    }
}