Feature: Added support for bulk rename

src/Files.App/Actions/FileSystem/RenameAction.cs

@@ -23,7 +23,7 @@ public RichGlyph Glyph
 			context.ShellPage is not null &&
 			IsPageTypeValid() &&
 			context.ShellPage.SlimContentPage is not null &&
-			IsSelectionValid();
+			context.HasSelection;
 
 		public RenameAction()
 		{
@@ -32,16 +32,18 @@ public RenameAction()
 			context.PropertyChanged += Context_PropertyChanged;
 		}
 
-		public Task ExecuteAsync(object? parameter = null)
+		public async Task ExecuteAsync(object? parameter = null)
 		{
-			context.ShellPage?.SlimContentPage?.ItemManipulationModel.StartRenameItem();
-
-			return Task.CompletedTask;
-		}
-
-		private bool IsSelectionValid()
-		{
-			return context.HasSelection && context.SelectedItems.Count == 1;
+			if (context.SelectedItems.Count > 1)
+			{
+				var viewModel = new BulkRenameDialogViewModel();
+				var dialogService = Ioc.Default.GetRequiredService<IDialogService>();
+				var result = await dialogService.ShowDialogAsync(viewModel);
+			}
+			else
+			{
+				context.ShellPage?.SlimContentPage?.ItemManipulationModel.StartRenameItem();
+			}
 		}
 
 		private bool IsPageTypeValid()

src/Files.App/Dialogs/BulkRenameDialog.xaml

@@ -0,0 +1,60 @@
+
+<!--  Copyright (c) 2024 Files Community. Licensed under the MIT License. See the LICENSE.  -->
+<ContentDialog
+	x:Class="Files.App.Dialogs.BulkRenameDialog"
+	xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
+	xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
+	xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
+	xmlns:helpers="using:Files.App.Helpers"
+	xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
+	Title="{helpers:ResourceString Name=BulkRename}"
+	DefaultButton="Primary"
+	HighContrastAdjustment="None"
+	IsPrimaryButtonEnabled="{x:Bind ViewModel.IsNameValid, Mode=OneWay}"
+	PrimaryButtonCommand="{x:Bind ViewModel.CommitRenameCommand, Mode=OneWay}"
+	PrimaryButtonText="{helpers:ResourceString Name=Rename}"
+	RequestedTheme="{x:Bind RootAppElement.RequestedTheme, Mode=OneWay}"
+	SecondaryButtonText="{helpers:ResourceString Name=Cancel}"
+	Style="{StaticResource DefaultContentDialogStyle}"
+	mc:Ignorable="d">
+
+	<StackPanel Width="440" Spacing="4">
+
+		<!--  Name  -->
+		<Grid
+			Padding="12"
+			Background="{ThemeResource CardBackgroundFillColorDefaultBrush}"
+			BorderBrush="{ThemeResource CardStrokeColorDefaultBrush}"
+			BorderThickness="1"
+			ColumnSpacing="8"
+			CornerRadius="4">
+			<Grid.ColumnDefinitions>
+				<ColumnDefinition Width="*" />
+				<ColumnDefinition Width="Auto" />
+			</Grid.ColumnDefinitions>
+
+			<TextBlock
+				Grid.Column="0"
+				VerticalAlignment="Center"
+				Text="{helpers:ResourceString Name=Name}" />
+
+			<TextBox
+				x:Name="FileNameBox"
+				Grid.Column="1"
+				Width="260"
+				PlaceholderText="{helpers:ResourceString Name=EnterName}"
+				Text="{x:Bind ViewModel.FileName, Mode=TwoWay, UpdateSourceTrigger=PropertyChanged}">
+				<TextBox.Resources>
+					<TeachingTip
+						x:Name="InvalidNameWarning"
+						Title="{helpers:ResourceString Name=InvalidFilename/Text}"
+						IsOpen="{x:Bind ViewModel.ShowNameWarning, Mode=OneWay}"
+						PreferredPlacement="Bottom"
+						Target="{x:Bind FileNameBox}" />
+				</TextBox.Resources>
+			</TextBox>
+
+		</Grid>
+
+	</StackPanel>
+</ContentDialog>

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

@@ -0,0 +1,29 @@
+// Copyright (c) 2024 Files Community
+// Licensed under the MIT License. See the LICENSE.
+using Microsoft.UI.Xaml;
+using Microsoft.UI.Xaml.Controls;
+
+namespace Files.App.Dialogs
+{
+	public sealed partial class BulkRenameDialog : ContentDialog, IDialog<BulkRenameDialogViewModel>
+	{
+		private FrameworkElement RootAppElement
+			=> (FrameworkElement)MainWindow.Instance.Content;
+
+		public BulkRenameDialogViewModel ViewModel
+		{
+			get => (BulkRenameDialogViewModel)DataContext;
+			set => DataContext = value;
+		}
+
+		public BulkRenameDialog()
+		{
+			InitializeComponent();
+		}
+
+		public new async Task<DialogResult> ShowAsync()
+		{
+			return (DialogResult)await base.ShowAsync();
+		}
+	}
+}

src/Files.App/Services/App/AppDialogService.cs

@@ -35,6 +35,7 @@ public DialogService()
 				{ typeof(GitHubLoginDialogViewModel), () => new GitHubLoginDialog() },
 				{ typeof(FileTooLargeDialogViewModel), () => new FileTooLargeDialog() },
 				{ typeof(ReleaseNotesDialogViewModel), () => new ReleaseNotesDialog() },
+				{ typeof(BulkRenameDialogViewModel), () => new BulkRenameDialog() },
 			}.ToFrozenDictionary();
 		}
 

src/Files.App/Strings/en-US/Resources.resw

@@ -3947,4 +3947,7 @@
   <data name="UserID" xml:space="preserve">
     <value>User ID</value>
   </data>
+  <data name="BulkRename" xml:space="preserve">
+    <value>Bulk rename</value>
+  </data>
 </root>

src/Files.App/ViewModels/Dialogs/BulkRenameDialogViewModel.cs

@@ -0,0 +1,60 @@
+// Copyright (c) 2024 Files Community
+// Licensed under the MIT License. See the LICENSE.
+
+using Windows.Storage;
+
+namespace Files.App.ViewModels.Dialogs
+{
+	public sealed class BulkRenameDialogViewModel : ObservableObject
+	{
+		private IContentPageContext context { get; } = Ioc.Default.GetRequiredService<IContentPageContext>();
+
+		// Properties
+
+		public bool IsNameValid =>
+			FilesystemHelpers.IsValidForFilename(_FileName) && !_FileName.Contains(".");
+
+		public bool ShowNameWarning =>
+			!string.IsNullOrEmpty(_FileName) && !IsNameValid;
+
+		private string _FileName = string.Empty;
+		public string FileName
+		{
+			get => _FileName;
+			set
+			{
+				if (SetProperty(ref _FileName, value))
+				{
+					OnPropertyChanged(nameof(IsNameValid));
+					OnPropertyChanged(nameof(ShowNameWarning));
+				}
+			}
+		}
+
+		// Commands
+		public IAsyncRelayCommand CommitRenameCommand { get; private set; }
+
+		public BulkRenameDialogViewModel()
+		{
+			CommitRenameCommand = new AsyncRelayCommand(DoCommitRenameAsync);
+		}
+
+		private async Task DoCommitRenameAsync()
+		{
+			if (context.ShellPage is null)
+				return;
+
+			await Task.WhenAll(context.SelectedItems.Select(item =>
+			{
+				var itemType = item.PrimaryItemAttribute == StorageItemTypes.Folder ? FilesystemItemType.Directory : FilesystemItemType.File;
+				return context.ShellPage.FilesystemHelpers.RenameAsync(
+					StorageHelpers.FromPathAndType(item.ItemPath, itemType),
+					FileName + item.FileExtension,
+					NameCollisionOption.GenerateUniqueName,
+					true,
+					false
+				);
+			}));
+		}
+	}
+}