netDxf/Collections/ObservableCollectionBase.cs

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#region netDxf, Copyright(C) 2014 Daniel Carvajal, Licensed under LGPL.

//                        netDxf library
// Copyright (C) 2014 Daniel Carvajal (haplokuon@gmail.com)
// 
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License, or (at your option) any later version.
// 
// The above copyright notice and this permission notice shall be included in all
// copies or substantial portions of the Software.
// 
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
// IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS
// FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR
// COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER
// IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN
// CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. 

#endregion

using System;
using System.Collections;
using System.Collections.Generic;

namespace netDxf.Collections
{
    /// <summary>
    /// Represent a collection of items that fire events when it is modified. 
    /// </summary>
    /// <typeparam name="T">Type of items.</typeparam>
    public class ObservableCollectionBase<T> :
        IList<T>
    {

        #region delegates and events

        public delegate void AddItemEventHandler(ObservableCollectionBase<T> sender, ObservableCollectionBaseEventArgs<T> e);
        public delegate void BeforeAddItemEventHandler(ObservableCollectionBase<T> sender, ObservableCollectionBaseEventArgs<T> e);
        public delegate void RemoveItemEventHandler(ObservableCollectionBase<T> sender, ObservableCollectionBaseEventArgs<T> e);
        public delegate void BeforeRemoveItemEventHandler(ObservableCollectionBase<T> sender, ObservableCollectionBaseEventArgs<T> e);

        public event BeforeAddItemEventHandler BeforeAddItem;
        public event AddItemEventHandler AddItem;
        public event BeforeRemoveItemEventHandler BeforeRemoveItem;
        public event RemoveItemEventHandler RemoveItem;

        protected virtual void OnAddItemEvent(T item)
        {
            AddItemEventHandler ae = AddItem;
            if (ae != null)
                ae(this, new ObservableCollectionBaseEventArgs<T>(item));
        }

        protected virtual bool OnBeforeAddItemEvent(T item)
        {
            BeforeAddItemEventHandler ae = BeforeAddItem;
            if (ae != null)
            {