Added drop to pin folder/s to Favorites (#6129)

Author: BanCrash

Files/UserControls/SidebarControl.xaml.cs

@@ -19,6 +19,7 @@
 using System.Windows.Input;
 using Windows.ApplicationModel.DataTransfer;
 using Windows.ApplicationModel.DataTransfer.DragDrop;
+using Windows.Storage;
 using Windows.System;
 using Windows.UI.Core;
 using Windows.UI.Xaml;
@@ -498,6 +499,8 @@ private void NavigationViewItem_DragStarting(UIElement sender, DragStartingEvent
 
         private object dragOverSection, dragOverItem = null;
 
+        private bool isDropOnProcess = false;
+
         private void NavigationViewItem_DragEnter(object sender, DragEventArgs e)
         {
             VisualStateManager.GoToState(sender as Microsoft.UI.Xaml.Controls.NavigationViewItem, "DragEnter", false);
@@ -542,6 +545,8 @@ private void NavigationViewItem_DragLeave(object sender, DragEventArgs e)
         {
             VisualStateManager.GoToState(sender as Microsoft.UI.Xaml.Controls.NavigationViewItem, "DragLeave", false);
 
+            isDropOnProcess = false;
+
             if ((sender as Microsoft.UI.Xaml.Controls.NavigationViewItem).DataContext is INavigationControlItem)
             {
                 if (sender == dragOverItem)
@@ -569,11 +574,36 @@ private async void NavigationViewLocationItem_DragOver(object sender, DragEventA
             if (Filesystem.FilesystemHelpers.HasDraggedStorageItems(e.DataView))
             {
                 e.Handled = true;
+                isDropOnProcess = true;
 
                 var (handledByFtp, storageItems) = await Filesystem.FilesystemHelpers.GetDraggedStorageItems(e.DataView);
                 storageItems ??= new List<IStorageItemWithPath>();
 
-                if (string.IsNullOrEmpty(locationItem.Path) ||
+                if (string.IsNullOrEmpty(locationItem.Path) && SectionType.Favorites.Equals(locationItem.Section) && storageItems.Any())
+                {
+                    bool haveFoldersToPin = false;
+
+                    foreach (var item in storageItems)
+                    {
+                        if (item.ItemType == FilesystemItemType.Directory && !SidebarPinnedModel.FavoriteItems.Contains(item.Path))
+                        {
+                            haveFoldersToPin = true;
+                            break;
+                        }
+                    }
+
+                    if (!haveFoldersToPin)
+                    {
+                        e.AcceptedOperation = DataPackageOperation.None;
+                    }
+                    else
+                    {
+                        e.DragUIOverride.IsCaptionVisible = true;
+                        e.DragUIOverride.Caption = "BaseLayoutItemContextFlyoutPinToFavorites/Text".GetLocalized();
+                        e.AcceptedOperation = DataPackageOperation.Move;
+                    }
+                }
+                else if (string.IsNullOrEmpty(locationItem.Path) ||
                     (storageItems.Any() && storageItems.AreItemsAlreadyInFolder(locationItem.Path))
                     || locationItem.Path.StartsWith("Home".GetLocalized(), StringComparison.OrdinalIgnoreCase))
                 {
@@ -668,7 +698,7 @@ private void NavigationViewLocationItem_DragOver_SetCaptions(LocationItem sender
             }
         }
 
-        private void NavigationViewLocationItem_Drop(object sender, DragEventArgs e)
+        private async void NavigationViewLocationItem_Drop(object sender, DragEventArgs e)
         {
             dragOverItem = null; // Reset dragged over item
             dragOverSection = null; // Reset dragged over section
@@ -684,12 +714,29 @@ private void NavigationViewLocationItem_Drop(object sender, DragEventArgs e)
                 VisualStateManager.GoToState(sender as Microsoft.UI.Xaml.Controls.NavigationViewItem, "Drop", false);
 
                 var deferral = e.GetDeferral();
-                SidebarItemDropped?.Invoke(this, new SidebarItemDroppedEventArgs()
+
+                if (string.IsNullOrEmpty(locationItem.Path) && SectionType.Favorites.Equals(locationItem.Section) && isDropOnProcess) // Pin to Favorites section
+                {
+                    var storageItems = await e.DataView.GetStorageItemsAsync();
+                    foreach (var item in storageItems)
+                    {
+                        if (item.IsOfType(StorageItemTypes.Folder) && !SidebarPinnedModel.FavoriteItems.Contains(item.Path))
+                        {
+                            SidebarPinnedModel.AddItem(item.Path);
+                        }
+                    }
+                }
+                else
                 {
-                    Package = e.DataView,
-                    ItemPath = locationItem.Path,
-                    AcceptedOperation = e.AcceptedOperation
-                });
+                    SidebarItemDropped?.Invoke(this, new SidebarItemDroppedEventArgs()
+                    {
+                        Package = e.DataView,
+                        ItemPath = locationItem.Path,
+                        AcceptedOperation = e.AcceptedOperation
+                    });
+                }
+
+                isDropOnProcess = false;
                 deferral.Complete();
             }
             else if ((e.DataView.Properties["sourceLocationItem"] as Microsoft.UI.Xaml.Controls.NavigationViewItem).DataContext is LocationItem sourceLocationItem)