//---------------------------------------------------------------------------
//
// <copyright file="BindingCollection.cs" company="Microsoft">
//    Copyright (C) Microsoft Corporation.  All rights reserved.
// </copyright>
//
// Description: Defines BindingList object, a list of binds.
//
// Specs:       http://avalon/connecteddata/M5%20Specs/UIBind.mht
//
//---------------------------------------------------------------------------
 
using System;
using System.Collections;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Diagnostics;
using System.Windows;
using System.Windows.Markup;
using System.Windows.Data;
using MS.Utility;
using MS.Internal;
 
namespace MS.Internal.Data
{
 
/// <summary>
///  A list of bindingss, used by MultiBinding classes.
/// </summary>
internal class BindingCollection : Collection<BindingBase>
{
 
    //------------------------------------------------------
    //
    //  Constructors
    //
    //------------------------------------------------------
 
    /// <summary> Constructor </summary>
    internal BindingCollection(BindingBase owner, BindingCollectionChangedCallback callback)
    {
        Invariant.Assert(owner != null && callback != null);
        _owner = owner;
        _collectionChangedCallback = callback;
    }
 
    // disable default constructor
    private BindingCollection()
    {
    }
 
 
 
    //------------------------------------------------------
    //
    //  Protected Methods
    //
    //------------------------------------------------------
 
    #region Protected Methods
 
    /// <summary>
    /// called by base class Collection&lt;T&gt; when the list is being cleared;
    /// raises a CollectionChanged event to any listeners
    /// </summary>
    protected override void ClearItems()
    {
        _owner.CheckSealed();
        base.ClearItems();
        OnBindingCollectionChanged();
    }
 
    /// <summary>
    /// called by base class Collection&lt;T&gt; when an item is removed from list;
    /// raises a CollectionChanged event to any listeners
    /// </summary>
    protected override void RemoveItem(int index)
    {
        _owner.CheckSealed();
        base.RemoveItem(index);
        OnBindingCollectionChanged();
    }
 
    /// <summary>
    /// called by base class Collection&lt;T&gt; when an item is added to list;
    /// raises a CollectionChanged event to any listeners
    /// </summary>
    protected override void InsertItem(int index, BindingBase item)
    {
        if (item == null)
            throw new ArgumentNullException("item");
        ValidateItem(item);
        _owner.CheckSealed();
 
        base.InsertItem(index, item);
        OnBindingCollectionChanged();
    }
 
    /// <summary>
    /// called by base class Collection&lt;T&gt; when an item is added to list;
    /// raises a CollectionChanged event to any listeners
    /// </summary>
    protected override void SetItem(int index, BindingBase item)
    {
        if (item == null)
            throw new ArgumentNullException("item");
        ValidateItem(item);
        _owner.CheckSealed();
 
        base.SetItem(index, item);
        OnBindingCollectionChanged();
    }
 
    #endregion Protected Methods
 
 
    //------------------------------------------------------
    //
    //  Private Methods
    //
    //------------------------------------------------------
 
    void ValidateItem(BindingBase binding)
    {
        // for V1, we only allow Binding as an item of BindingCollection.
        if (!(binding is Binding))
            throw new NotSupportedException(SR.Get(SRID.BindingCollectionContainsNonBinding, binding.GetType().Name));
    }
 
    void OnBindingCollectionChanged()
    {
        if (_collectionChangedCallback != null)
            _collectionChangedCallback();
    }
 
    //------------------------------------------------------
    //
    //  Private Fields
    //
    //------------------------------------------------------
 
    BindingBase _owner;
    private BindingCollectionChangedCallback _collectionChangedCallback;
}
 
// the delegate to use for getting BindingListChanged notifications
internal delegate void BindingCollectionChangedCallback();
 
}