using System;
using System.Collections.Generic;
using System.Collections.ObjectModel;
using System.Linq;
namespace AdvancementVoyage.Magic.Utility
{
/// <summary>
/// An observable collection that can be sorted.
/// </summary>
/// <typeparam name="T">The type of item contained in the observable collection.</typeparam>
[Serializable]
internal sealed class SortableObservableCollection<T> : ObservableCollection<T>
{
/// <summary>
/// Initializes a new instance of the SortableObservableCollection
/// class.
/// </summary>
public SortableObservableCollection()
: base() { }
/// <summary>
/// Initializes a new instance of the SortableObservableCollection class
/// that contains elements copied from the specified collection.
/// </summary>
/// <param name="collection">
/// The collection from which the elements are copied.
/// </param>
/// <exception cref="ArgumentNullException">
/// The collection parameter cannot be a null reference.
/// </exception>
public SortableObservableCollection(IEnumerable<T> collection)
: base(collection) { }
/// <summary>
/// Initializes a new instance of the SortableObservableCollection
/// class that contains elements copied from the specified list.
/// </summary>
/// <param name="list">
/// The list from which the elements are copied.
/// </param>
/// <exception cref="ArgumentNullException">
/// The list parameter cannot be a null reference.
/// </exception>
public SortableObservableCollection(List<T> list)
: base(list) { }
/// <summary>
/// Sorts the items of the collection in ascending order according to a key.
/// </summary>
/// <typeparam name="TKey">
/// The type of the key returned by <paramref name="keySelector"/>.
/// </typeparam>
/// <param name="keySelector">
/// A function to extract a key from an item.
/// </param>
public void Sort<TKey>(Func<T, TKey> keySelector)
{
this.InternalSort(Items.OrderBy(keySelector));
}
/// <summary>
/// Sorts the items of the collection in ascending order according to a key.
/// </summary>
/// <typeparam name="TKey">
/// The type of the key returned by <paramref name="keySelector"/>.
/// </typeparam>
/// <param name="keySelector">
/// A function to extract a key from an item.
/// </param>
/// <param name="comparer">
/// An <see cref="IComparer{T}"/> to compare keys.
/// </param>
public void Sort<TKey>(Func<T, TKey> keySelector, IComparer<TKey> comparer)
{
this.InternalSort(Items.OrderBy(keySelector, comparer));
}
/// <summary>
/// Moves the items of the collection so that their orders are the same as those of the items provided.
/// </summary>
/// <param name="sortedItems">
/// An <see cref="IEnumerable{T}"/> to provide item orders.
/// </param>
private void InternalSort(IEnumerable<T> sortedItems)
{
var sortedItemsList = sortedItems.ToList();
foreach (var item in sortedItemsList)
{
Move(IndexOf(item), sortedItemsList.IndexOf(item));
}
}
}
}
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