Feature: Improved performance when creating new files

src/Files.App/App.xaml.cs

@@ -122,6 +122,7 @@ private IServiceProvider ConfigureServices()
 				.AddSingleton<IThreadingService, ThreadingService>()
 				.AddSingleton<ILocalizationService, LocalizationService>()
 				.AddSingleton<ICloudDetector, CloudDetector>()
+				.AddSingleton<IAddItemService, AddItemService>()
 #if SIDELOAD
 				.AddSingleton<IUpdateService, SideloadUpdateService>()
 #else
@@ -180,6 +181,7 @@ private static async Task StartAppCenter()
 		private static async Task InitializeAppComponentsAsync()
 		{
 			var userSettingsService = Ioc.Default.GetRequiredService<IUserSettingsService>();
+			var addItemService = Ioc.Default.GetRequiredService<IAddItemService>();
 			var preferencesSettingsService = userSettingsService.PreferencesSettingsService;
 
 			// Start off a list of tasks we need to run before we can continue startup
@@ -197,7 +199,7 @@ await Task.WhenAll(
 				);
 				await Task.WhenAll(
 					JumpList.InitializeAsync(),
-					ContextFlyoutItemHelper.CachedNewContextMenuEntries
+					addItemService.GetNewEntriesAsync()
 				);
 				FileTagsHelper.UpdateTagsDb();
 			});

src/Files.App/Dialogs/AddItemDialog.xaml.cs

@@ -1,4 +1,5 @@
-using Files.App.Extensions;
+using CommunityToolkit.Mvvm.DependencyInjection;
+using Files.Backend.Services;
 using Files.Backend.ViewModels.Dialogs;
 using Files.Backend.ViewModels.Dialogs.AddItemDialog;
 using Files.Shared.Enums;
@@ -13,6 +14,8 @@ namespace Files.App.Dialogs
 {
 	public sealed partial class AddItemDialog : ContentDialog, IDialog<AddItemDialogViewModel>
 	{
+		private readonly IAddItemService addItemService = Ioc.Default.GetRequiredService<IAddItemService>();
+
 		public AddItemDialogViewModel ViewModel
 		{
 			get => (AddItemDialogViewModel)DataContext;
@@ -34,8 +37,8 @@ private void ListView_ItemClick(object sender, ItemClickEventArgs e)
 
 		private async void AddItemDialog_Loaded(object sender, RoutedEventArgs e)
 		{
-			var itemTypes = await ShellNewEntryExtensions.GetNewContextMenuEntries();
-			await ViewModel.AddItemsToList(itemTypes); // TODO(i): This is a very cheap way of doing it, consider adding a service to retrieve the itemTypes list.
+			var itemTypes = await addItemService.GetNewEntriesAsync();
+			await ViewModel.AddItemsToList(itemTypes);
 
 			// Focus on the list view so users can use keyboard navigation
 			AddItemsListView.Focus(FocusState.Programmatic);

src/Files.App/Helpers/ContextFlyoutItemHelper.cs

@@ -4,6 +4,7 @@
 using Files.App.Filesystem;
 using Files.App.Interacts;
 using Files.App.ViewModels;
+using Files.Backend.Services;
 using Files.Backend.Services.Settings;
 using Files.Shared;
 using Files.Shared.Enums;
@@ -23,7 +24,7 @@ namespace Files.App.Helpers
 {
 	public static class ContextFlyoutItemHelper
 	{
-		public static Task<List<ShellNewEntry>> CachedNewContextMenuEntries = ShellNewEntryExtensions.GetNewContextMenuEntries();
+		private static readonly IAddItemService addItemService = Ioc.Default.GetRequiredService<IAddItemService>();
 
 		public static List<ContextMenuFlyoutItemViewModel> GetItemContextCommandsWithoutShellItems(CurrentInstanceViewModel currentInstanceViewModel, string workingDir, List<ListedItem> selectedItems, BaseLayoutCommandsViewModel commandsViewModel, bool shiftPressed, bool showOpenMenu, SelectedItemsPropertiesViewModel selectedItemsPropertiesViewModel)
 		{
@@ -1122,7 +1123,7 @@ public static List<ContextMenuFlyoutItemViewModel> GetNewItemItems(BaseLayoutCom
 
 			if (canCreateFileInPage)
 			{
-				var cachedNewContextMenuEntries = CachedNewContextMenuEntries.IsCompletedSuccessfully ? CachedNewContextMenuEntries.Result : null;
+				var cachedNewContextMenuEntries = addItemService.GetNewEntriesAsync().Result;
 				cachedNewContextMenuEntries?.ForEach(i =>
 				{
 					if (!string.IsNullOrEmpty(i.IconBase64))

src/Files.App/ServicesImplementation/AddItemService.cs

@@ -0,0 +1,22 @@
+using Files.App.Extensions;
+using Files.Backend.Services;
+using Files.Shared;
+using System.Collections.Generic;
+using System.Threading.Tasks;
+
+namespace Files.App.ServicesImplementation
+{
+	/// <inheritdoc cref="IAddItemService"/>
+	internal sealed class AddItemService : IAddItemService
+	{
+		private List<ShellNewEntry> _cached;
+
+		public async Task<List<ShellNewEntry>> GetNewEntriesAsync()
+		{
+			if (_cached is null || _cached.Count == 0)
+				_cached = await ShellNewEntryExtensions.GetNewContextMenuEntries();
+
+			return _cached;
+		}
+	}
+}

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

@@ -2,6 +2,7 @@
 using Files.App.DataModels;
 using Files.App.Helpers;
 using Files.App.ViewModels;
+using Files.Backend.Services;
 using Files.Backend.Services.Settings;
 using Microsoft.UI.Xaml;
 using Microsoft.UI.Xaml.Controls;
@@ -25,6 +26,8 @@ public InnerNavigationToolbar()
 
 		public IUserSettingsService UserSettingsService { get; } = Ioc.Default.GetRequiredService<IUserSettingsService>();
 
+		private readonly IAddItemService addItemService = Ioc.Default.GetRequiredService<IAddItemService>();
+
 		public AppModel AppModel => App.AppModel;
 
 		public PreviewPaneViewModel PreviewPaneViewModel => App.PreviewPaneViewModel;
@@ -97,7 +100,7 @@ private void NewEmptySpace_Opening(object sender, object e)
 				shell.ForEach(x => NewEmptySpace.Items.Remove(x));
 				return;
 			}
-			var cachedNewContextMenuEntries = ContextFlyoutItemHelper.CachedNewContextMenuEntries.IsCompletedSuccessfully ? ContextFlyoutItemHelper.CachedNewContextMenuEntries.Result : null;
+			var cachedNewContextMenuEntries = addItemService.GetNewEntriesAsync().Result;
 			if (cachedNewContextMenuEntries is null)
 				return;
 			if (!NewEmptySpace.Items.Any(x => (x.Tag as string) == "CreateNewFile"))

src/Files.Backend/Services/IAddItemService.cs

@@ -0,0 +1,18 @@
+using Files.Shared;
+using System.Collections.Generic;
+using System.Threading.Tasks;
+
+namespace Files.Backend.Services
+{
+	/// <summary>
+	/// A service to retrieve available item types
+	/// </summary>
+	public interface IAddItemService
+	{
+		/// <summary>
+		/// Gets a list of the available item types
+		/// </summary>
+		/// <returns>List of the available item types</returns>
+		Task<List<ShellNewEntry>> GetNewEntriesAsync();
+	}
+}