Added support to undo & redo file operations

Files/App.xaml.cs

@@ -2,6 +2,7 @@
 using Files.Controllers;
 using Files.Controls;
 using Files.Filesystem;
+using Files.Filesystem.FilesystemHistory;
 using Files.Helpers;
 using Files.View_Models;
 using Files.Views;
@@ -17,6 +18,7 @@
 using System.Collections.Generic;
 using System.Diagnostics;
 using System.Linq;
+using System.Threading;
 using System.Threading.Tasks;
 using Windows.ApplicationModel;
 using Windows.ApplicationModel.Activation;
@@ -37,6 +39,13 @@ sealed partial class App : Application
     {
         private static bool ShowErrorNotification = false;
 
+        private readonly static CancellationTokenSource cancellationTokenSource = new CancellationTokenSource();
+        public static CancellationToken CancellationToken = cancellationTokenSource.Token;
+
+        public static SemaphoreSlim SemaphoreSlim = new SemaphoreSlim(1, 1);
+        public static readonly List<IStorageHistory> StorageHistory = new List<IStorageHistory>();
+        public static int StorageHistoryIndex = 0;
+
         public static SettingsViewModel AppSettings { get; set; }
         public static InteractionViewModel InteractionViewModel { get; set; }
         public static JumpListManager JumpList { get; } = new JumpListManager();
@@ -59,6 +68,30 @@ public App()
             StartAppCenter();
         }
 
+        public static void AddHistory(IStorageHistory history)
+        {
+            if (history != null)
+            {
+                StorageHistory.Add(history);
+                if (StorageHistory.Count > 1)
+                {
+                    StorageHistoryIndex++;
+                }
+            }
+        }
+
+        public static void RemoveHistory(IStorageHistory history)
+        {
+            if (history != null)
+            {
+                StorageHistory.Remove(history);
+
+                StorageHistoryIndex--;
+                int index = ArrayHelpers.FitBounds(StorageHistoryIndex, StorageHistory.Count);
+                StorageHistoryIndex = index;
+            }
+        }
+
         private async void StartAppCenter()
         {
             JObject obj;

Files/BaseLayout.cs

@@ -137,6 +137,7 @@ public BaseLayout()
         {
             SelectedItemsPropertiesViewModel = new SelectedItemsPropertiesViewModel(this);
             DirectoryPropertiesViewModel = new DirectoryPropertiesViewModel();
+
             // QuickLook Integration
             ApplicationDataContainer localSettings = ApplicationData.Current.LocalSettings;
             var isQuickLookIntegrationEnabled = localSettings.Values["quicklook_enabled"];
@@ -163,6 +164,8 @@ public BaseLayout()
 
         public abstract void SetSelectedItemsOnUi(List<ListedItem> selectedItems);
 
+        public abstract void AddSelectedItemsOnUi(List<ListedItem> selectedItems);
+
         private void ClearShellContextMenus(MenuFlyout menuFlyout)
         {
             var contextMenuItems = menuFlyout.Items.Where(c => c.Tag != null && ParseContextMenuTag(c.Tag).menuHandle != null).ToList();
@@ -597,13 +600,13 @@ protected async void List_DragOver(object sender, DragEventArgs e)
             deferral.Complete();
         }
 
-        protected void List_Drop(object sender, DragEventArgs e)
+        protected async void List_Drop(object sender, DragEventArgs e)
         {
             var deferral = e.GetDeferral();
 
             if (e.DataView.Contains(StandardDataFormats.StorageItems))
             {
-                ParentShellPageInstance.InteractionOperations.ItemOperationCommands.PasteItemWithStatus(e.DataView, ParentShellPageInstance.FilesystemViewModel.WorkingDirectory, e.AcceptedOperation);
+                await ParentShellPageInstance.InteractionOperations.FilesystemHelpers.PerformOperationTypeAsync(e.AcceptedOperation, e.DataView, ParentShellPageInstance.FilesystemViewModel.WorkingDirectory, true);
                 e.Handled = true;
             }
 
@@ -703,13 +706,13 @@ protected async void Item_DragOver(object sender, DragEventArgs e)
             deferral.Complete();
         }
 
-        protected void Item_Drop(object sender, DragEventArgs e)
+        protected async void Item_Drop(object sender, DragEventArgs e)
         {
             var deferral = e.GetDeferral();
 
             e.Handled = true;
             ListedItem rowItem = GetItemFromElement(sender);
-            ParentShellPageInstance.InteractionOperations.ItemOperationCommands.PasteItemWithStatus(e.DataView, (rowItem as ShortcutItem)?.TargetPath ?? rowItem.ItemPath, e.AcceptedOperation);
+            await ParentShellPageInstance.InteractionOperations.FilesystemHelpers.PerformOperationTypeAsync(e.AcceptedOperation, e.DataView, (rowItem as ShortcutItem)?.TargetPath ?? rowItem.ItemPath, true);
             deferral.Complete();
         }