Feature: Improved performance when opening path bar flyouts

src/Files.App/Assets/FilesOpenDialog/Files.App.Launcher.exe.sha256

@@ -1 +1 @@
-7219ea9bd5832c77f1d6c8e57f97e6504a33f07bdef61122a171061f0dcb3509
+cc957911eb0abac03d457a70f1c6ff03eeabd0d05548806ff801998d7218b48d

src/Files.App/Data/EventArguments/ToolbarFlyoutOpeningEventArgs.cs

@@ -0,0 +1,17 @@
+// Copyright (c) Files Community
+// Licensed under the MIT License.
+
+using Microsoft.UI.Xaml.Controls;
+
+namespace Files.App.Data.EventArguments
+{
+	public sealed class ToolbarFlyoutOpeningEventArgs
+	{
+		public MenuFlyout OpeningFlyout { get; }
+
+		public ToolbarFlyoutOpeningEventArgs(MenuFlyout openingFlyout)
+		{
+			OpeningFlyout = openingFlyout;
+		}
+	}
+}

src/Files.App/UserControls/AddressToolbar.xaml

@@ -277,6 +277,7 @@
 					<Button.ContextFlyout>
 						<MenuFlyout
 							x:Name="BackHistoryFlyout"
+							AreOpenCloseAnimationsEnabled="False"
 							Opening="BackHistoryFlyout_Opening"
 							Placement="BottomEdgeAlignedLeft"
 							ScrollViewer.VerticalScrollBarVisibility="Auto"
@@ -306,6 +307,7 @@
 					<Button.ContextFlyout>
 						<MenuFlyout
 							x:Name="ForwardHistoryFlyout"
+							AreOpenCloseAnimationsEnabled="False"
 							Opening="ForwardHistoryFlyout_Opening"
 							Placement="BottomEdgeAlignedLeft"
 							ScrollViewer.VerticalScrollBarVisibility="Auto"

src/Files.App/UserControls/AddressToolbar.xaml.cs

@@ -1,15 +1,15 @@
 // Copyright (c) Files Community
 // Licensed under the MIT License.
 
-using System.Windows.Input;
 using Microsoft.UI.Input;
 using Microsoft.UI.Xaml;
 using Microsoft.UI.Xaml.Controls;
 using Microsoft.UI.Xaml.Controls.Primitives;
 using Microsoft.UI.Xaml.Input;
 using Microsoft.UI.Xaml.Media;
-using Windows.System;
 using Microsoft.UI.Xaml.Navigation;
+using System.Windows.Input;
+using Windows.System;
 using FocusManager = Microsoft.UI.Xaml.Input.FocusManager;
 
 namespace Files.App.UserControls
@@ -161,37 +161,49 @@ private async void ForwardHistoryFlyout_Opening(object? sender, object e)
 			await AddHistoryItemsAsync(shellPage.ForwardStack, ForwardHistoryFlyout.Items, false);
 		}
 
-		private async Task AddHistoryItemsAsync(IEnumerable<PageStackEntry> items, IList<MenuFlyoutItemBase> destination, bool isBackMode)
+		private async Task AddHistoryItemsAsync(IEnumerable<PageStackEntry> items, IList<MenuFlyoutItemBase> flyoutItems, bool isBackMode)
 		{
 			// This may not seem performant, however it's the most viable trade-off to make.
 			// Instead of constantly keeping track of back/forward stack and performing lookups
 			// (which may degrade performance), we only add items in bulk when it's needed.
 			// There's also a high chance the user might not use the feature at all in which case
 			// the former approach would just waste extra performance gain
 
-			destination.Clear();
+			flyoutItems.Clear();
 			foreach (var item in items.Reverse())
 			{
 				if (item.Parameter is not NavigationArguments args || args.NavPathParam is null)
 					continue;
 
-				var imageSource = await NavigationHelpers.GetIconForPathAsync(args.NavPathParam);
 				var fileName = SystemIO.Path.GetFileName(args.NavPathParam);
 
 				// The fileName is empty if the path is (root) drive path
 				if (string.IsNullOrEmpty(fileName))
 					fileName = args.NavPathParam;
 
-				destination.Add(new MenuFlyoutItem()
+				var flyoutItem = new MenuFlyoutItem
 				{
-					Icon = new ImageIcon() { Source = imageSource },
+					Icon = new FontIcon { Glyph = "\uE8B7" }, // Use font icon as placeholder
 					Text = fileName,
 					Command = historyItemClickedCommand,
 					CommandParameter = new ToolbarHistoryItemModel(item, isBackMode)
-				});
+				};
+
+				flyoutItems?.Add(flyoutItem);
+
+				// Start loading the thumbnail in the background
+				_ = LoadFlyoutItemIconAsync(flyoutItem, args.NavPathParam);
 			}
 		}
 
+		private async Task LoadFlyoutItemIconAsync(MenuFlyoutItem flyoutItem, string path)
+		{
+			var imageSource = await NavigationHelpers.GetIconForPathAsync(path);
+
+			if (imageSource is not null)
+				flyoutItem.Icon = new ImageIcon { Source = imageSource };
+		}
+
 		private void HistoryItemClicked(ToolbarHistoryItemModel? itemModel)
 		{
 			if (itemModel is null)

src/Files.App/UserControls/PathBreadcrumb.xaml

@@ -94,8 +94,9 @@
 						<Button.Flyout>
 							<MenuFlyout
 								x:Name="ExpandMenuFlyout"
+								AreOpenCloseAnimationsEnabled="False"
 								Closed="PathBoxItemFlyout_Closed"
-								Opened="PathBoxItemFlyout_Opened"
+								Opening="PathBoxItemFlyout_Opening"
 								Placement="BottomEdgeAlignedLeft"
 								ScrollViewer.VerticalScrollBarVisibility="Auto"
 								ScrollViewer.VerticalScrollMode="Auto">

src/Files.App/UserControls/PathBreadcrumb.xaml.cs

@@ -20,9 +20,9 @@ private void PathItemSeparator_DataContextChanged(FrameworkElement sender, DataC
 			ViewModel.PathItemSeparator_DataContextChanged(sender, args);
 		}
 
-		private void PathBoxItemFlyout_Opened(object sender, object e)
+		private void PathBoxItemFlyout_Opening(object sender, object e)
 		{
-			ViewModel.PathboxItemFlyout_Opened(sender, e);
+			ViewModel.PathboxItemFlyout_Opening(sender, e);
 		}
 
 		private void PathBoxItemFlyout_Closed(object sender, object e)

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

@@ -33,7 +33,7 @@ public sealed class AddressToolbarViewModel : ObservableObject, IAddressToolbarV
 
 		public delegate void ToolbarPathItemInvokedEventHandler(object sender, PathNavigationEventArgs e);
 
-		public delegate void ToolbarFlyoutOpenedEventHandler(object sender, ToolbarFlyoutOpenedEventArgs e);
+		public delegate void ToolbarFlyoutOpeningEventHandler(object sender, ToolbarFlyoutOpeningEventArgs e);
 
 		public delegate void ToolbarPathItemLoadedEventHandler(object sender, ToolbarPathItemLoadedEventArgs e);
 
@@ -43,7 +43,7 @@ public sealed class AddressToolbarViewModel : ObservableObject, IAddressToolbarV
 
 		public event ToolbarPathItemInvokedEventHandler? ToolbarPathItemInvoked;
 
-		public event ToolbarFlyoutOpenedEventHandler? ToolbarFlyoutOpened;
+		public event ToolbarFlyoutOpeningEventHandler? ToolbarFlyoutOpening;
 
 		public event ToolbarPathItemLoadedEventHandler? ToolbarPathItemLoaded;
 
@@ -456,9 +456,9 @@ public void PathItemSeparator_DataContextChanged(FrameworkElement sender, DataCo
 			});
 		}
 
-		public void PathboxItemFlyout_Opened(object sender, object e)
+		public void PathboxItemFlyout_Opening(object sender, object e)
 		{
-			ToolbarFlyoutOpened?.Invoke(this, new ToolbarFlyoutOpenedEventArgs() { OpenedFlyout = (MenuFlyout)sender });
+			ToolbarFlyoutOpening?.Invoke(this, new ToolbarFlyoutOpeningEventArgs((MenuFlyout)sender));
 		}
 
 		public void PathBoxItemFlyout_Closed(object sender, object e)
@@ -651,11 +651,9 @@ public async Task SetPathBoxDropDownFlyoutAsync(MenuFlyout flyout, PathBoxItem p
 
 			foreach (var childFolder in childFolders)
 			{
-				var imageSource = await NavigationHelpers.GetIconForPathAsync(childFolder.Path);
-
 				var flyoutItem = new MenuFlyoutItem
 				{
-					Icon = new ImageIcon() { Source = imageSource },
+					Icon = new FontIcon { Glyph = "\uE8B7" }, // Use font icon as placeholder
 					Text = childFolder.Item.Name,
 					FontSize = 12,
 				};
@@ -670,9 +668,21 @@ public async Task SetPathBoxDropDownFlyoutAsync(MenuFlyout flyout, PathBoxItem p
 				}
 
 				flyout.Items?.Add(flyoutItem);
+
+				// Start loading the thumbnail in the background
+				_ = LoadFlyoutItemIconAsync(flyoutItem, childFolder.Path);
 			}
 		}
 
+		private async Task LoadFlyoutItemIconAsync(MenuFlyoutItem flyoutItem, string path)
+		{
+			var imageSource = await NavigationHelpers.GetIconForPathAsync(path);
+
+			if (imageSource is not null)
+				flyoutItem.Icon = new ImageIcon { Source = imageSource };
+		}
+
+
 		private static string NormalizePathInput(string currentInput, bool isFtp)
 		{
 			if (currentInput.Contains('/') && !isFtp)

src/Files.App/Views/Shells/BaseShellPage.cs

@@ -180,7 +180,7 @@ public BaseShellPage(CurrentInstanceViewModel instanceViewModel)
 				FlowDirection = FlowDirection.RightToLeft;
 
 			ToolbarViewModel.ToolbarPathItemInvoked += ShellPage_NavigationRequested;
-			ToolbarViewModel.ToolbarFlyoutOpened += ShellPage_ToolbarFlyoutOpened;
+			ToolbarViewModel.ToolbarFlyoutOpening += ShellPage_ToolbarFlyoutOpening;
 			ToolbarViewModel.ToolbarPathItemLoaded += ShellPage_ToolbarPathItemLoaded;
 			ToolbarViewModel.AddressBarTextEntered += ShellPage_AddressBarTextEntered;
 			ToolbarViewModel.PathBoxItemDropped += ShellPage_PathBoxItemDropped;
@@ -431,12 +431,12 @@ protected async void ShellPage_ToolbarPathItemLoaded(object sender, ToolbarPathI
 			await ToolbarViewModel.SetPathBoxDropDownFlyoutAsync(e.OpenedFlyout, e.Item, this);
 		}
 
-		protected async void ShellPage_ToolbarFlyoutOpened(object sender, ToolbarFlyoutOpenedEventArgs e)
+		protected async void ShellPage_ToolbarFlyoutOpening(object sender, ToolbarFlyoutOpeningEventArgs e)
 		{
-			var pathBoxItem = ((Button)e.OpenedFlyout.Target).DataContext as PathBoxItem;
+			var pathBoxItem = ((Button)e.OpeningFlyout.Target).DataContext as PathBoxItem;
 
 			if (pathBoxItem is not null)
-				await ToolbarViewModel.SetPathBoxDropDownFlyoutAsync(e.OpenedFlyout, pathBoxItem, this);
+				await ToolbarViewModel.SetPathBoxDropDownFlyoutAsync(e.OpeningFlyout, pathBoxItem, this);
 		}
 
 		protected async void NavigationToolbar_QuerySubmitted(object sender, ToolbarQuerySubmittedEventArgs e)
@@ -828,7 +828,7 @@ public virtual void Dispose()
 			drivesViewModel.PropertyChanged -= DrivesManager_PropertyChanged;
 
 			ToolbarViewModel.ToolbarPathItemInvoked -= ShellPage_NavigationRequested;
-			ToolbarViewModel.ToolbarFlyoutOpened -= ShellPage_ToolbarFlyoutOpened;
+			ToolbarViewModel.ToolbarFlyoutOpening -= ShellPage_ToolbarFlyoutOpening;
 			ToolbarViewModel.ToolbarPathItemLoaded -= ShellPage_ToolbarPathItemLoaded;
 			ToolbarViewModel.AddressBarTextEntered -= ShellPage_AddressBarTextEntered;
 			ToolbarViewModel.PathBoxItemDropped -= ShellPage_PathBoxItemDropped;