1  // Copyright (c) Microsoft Corporation
 2  // The Microsoft Corporation licenses this file to you under the MIT license.
 3  // See the LICENSE file in the project root for more information.
 4  
 5  using System;
 6  using System.Collections.Generic;
 7  using System.Collections.ObjectModel;
 8  using System.Linq;
 9  using System.Text;
10  using System.Threading.Tasks;
11  
12  namespace Microsoft.PowerToys.Settings.UI.Helpers
13  {
14  #pragma warning disable SA1649 // File name should match first type name
15      public class IndexedItem<T>
16  #pragma warning restore SA1649 // File name should match first type name
17      {
18          public T Item { get; set; }
19  
20          public int Index { get; set; }
21  
22          public IndexedItem(T item, int index)
23          {
24              Item = item;
25              Index = index;
26          }
27      }
28  
29  #pragma warning disable SA1402 // File may only contain a single type
30      public partial class IndexedObservableCollection<T> : ObservableCollection<IndexedItem<T>>
31  #pragma warning restore SA1402 // File may only contain a single type
32      {
33          public IndexedObservableCollection(IEnumerable<T> items)
34          {
35              int index = 0;
36              foreach (var item in items)
37              {
38                  Add(new IndexedItem<T>(item, index++));
39              }
40          }
41  
42          public IEnumerable<T> ToEnumerable()
43          {
44              return this.Select(x => x.Item);
45          }
46  
47          public void Swap(int index1, int index2)
48          {
49              var temp = this[index1];
50              this[index1] = this[index2];
51              this[index2] = temp;
52  
53              // Update the original index of the items
54              this[index1].Index = index1;
55              this[index2].Index = index2;
56          }
57      }
58  }