Create ShelfViewModel.cs

Author: d2dyno1

src/Files.App/ViewModels/UserControls/ShelfViewModel.cs

@@ -0,0 +1,57 @@
+// Copyright (c) Files Community
+// Licensed under the MIT License.
+
+using System.Collections.Specialized;
+using Files.Shared.Utils;
+
+namespace Files.App.ViewModels.UserControls
+{
+	[Bindable(true)]
+	public sealed partial class ShelfViewModel : ObservableObject, IAsyncInitialize
+	{
+		private readonly Dictionary<string, IFolderWatcher> _watchers;
+
+		public ObservableCollection<ShelfItem> Items { get; }
+
+		public ShelfViewModel()
+		{
+			_watchers = new();
+			Items = new();
+			Items.CollectionChanged += Items_CollectionChanged;
+		}
+
+		/// <inheritdoc/>
+		public Task InitAsync(CancellationToken cancellationToken = default)
+		{
+			// TODO: Load persisted shelf items
+			return Task.CompletedTask;
+		}
+
+		private async void Items_CollectionChanged(object? sender, NotifyCollectionChangedEventArgs e)
+		{
+			switch (e.Action)
+			{
+				case NotifyCollectionChangedAction.Add when e.NewItems is not null:
+				{
+					if (e.NewItems[0] is not INestedStorable nestedStorable)
+						return;
+
+					var parentPath = SystemIO.Path.GetDirectoryName(nestedStorable.Id) ?? string.Empty;
+					if (_watchers.ContainsKey(parentPath))
+						return;
+					
+					if (await nestedStorable.GetParentAsync() is not IMutableFolder mutableFolder)
+						return;
+
+					// TODO: Register IFolderWatcher
+
+					break;
+				}
+
+				case NotifyCollectionChangedAction.Remove:
+
+					break;
+			}
+		}
+	}
+}