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// Copyright (c) AlphaSierraPapa for the SharpDevelop Team (for details please see \doc\copyright.txt)
// This code is distributed under the GNU LGPL (for details please see \doc\license.txt)
using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Collections.Specialized;
namespace ICSharpCode.AvalonEdit.Xml
{
/// <summary>
/// Two collections in sequence
/// </summary>
public class MergedCollection<T, TCollection> : ObservableCollection<T> where TCollection : INotifyCollectionChanged, IList<T>
{
TCollection a;
TCollection b;
/// <summary> Create a wrapper containing elements of 'a' and then 'b' </summary>
[System.Diagnostics.CodeAnalysis.SuppressMessage("Microsoft.Naming", "CA1704:IdentifiersShouldBeSpelledCorrectly")]
public MergedCollection(TCollection a, TCollection b)
{
this.a = a;
this.b = b;
this.a.CollectionChanged += SourceCollectionAChanged;
this.b.CollectionChanged += SourceCollectionBChanged;
Reset();
}
void Reset()
{
this.Clear();
foreach(T item in a) this.Add(item);
foreach(T item in b) this.Add(item);
}
void SourceCollectionAChanged(object sender, NotifyCollectionChangedEventArgs e)
{
SourceCollectionChanged(0, e);
}
void SourceCollectionBChanged(object sender, NotifyCollectionChangedEventArgs e)
{
SourceCollectionChanged(a.Count, e);
}
void SourceCollectionChanged(int collectionStart, NotifyCollectionChangedEventArgs e)
{
switch(e.Action) {
case NotifyCollectionChangedAction.Add:
for (int i = 0; i < e.NewItems.Count; i++) {
this.InsertItem(collectionStart + e.NewStartingIndex + i, (T)e.NewItems[i]);
}
break;
case NotifyCollectionChangedAction.Remove:
for (int i = 0; i < e.OldItems.Count; i++) {
this.RemoveAt(collectionStart + e.OldStartingIndex);
}
break;
case NotifyCollectionChangedAction.Reset:
Reset();
break;
default:
throw new NotSupportedException(e.Action.ToString());
}
}
}
}
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