Feature: Added support for filtering current directory when typing into search box (#15119)

Author: hishitetsu

src/Files.App/Data/Models/ItemViewModel.cs

@@ -663,6 +663,8 @@ public void UpdateEmptyTextType()
 			EmptyTextType = FilesAndFolders.Count == 0 ? (IsSearchResults ? EmptyTextType.NoSearchResultsFound : EmptyTextType.FolderEmpty) : EmptyTextType.None;
 		}
 
+		public string? FilesAndFoldersFilter { get; set; }
+
 		// Apply changes immediately after manipulating on filesAndFolders completed
 		public async Task ApplyFilesAndFoldersChangesAsync()
 		{
@@ -706,7 +708,10 @@ await dispatcherQueue.EnqueueOrInvokeAsync(() =>
 								return;
 
 							FilesAndFolders.Clear();
-							FilesAndFolders.AddRange(filesAndFoldersLocal);
+							if (string.IsNullOrEmpty(FilesAndFoldersFilter))
+								FilesAndFolders.AddRange(filesAndFoldersLocal);
+							else
+								FilesAndFolders.AddRange(filesAndFoldersLocal.Where(x => x.Name.Contains(FilesAndFoldersFilter, StringComparison.OrdinalIgnoreCase)));
 
 							if (folderSettings.DirectoryGroupOption != GroupOption.None)
 								OrderGroups();

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

@@ -581,11 +581,12 @@ private void CloseSearchBox(bool doFocus = false)
 			}
 			else
 			{
-				SearchBox.Query = string.Empty;
 				IsSearchBoxVisible = false;
 
 				if (doFocus)
 				{
+					SearchBox.Query = string.Empty;
+
 					var page = Ioc.Default.GetRequiredService<IContentPageContext>().ShellPage?.SlimContentPage;
 
 					if (page is BaseGroupableLayoutPage svb && svb.IsLoaded)

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

@@ -363,6 +363,9 @@ protected async void ShellPage_QuerySubmitted(ISearchBoxViewModel sender, Search
 
 		protected async void ShellPage_TextChanged(ISearchBoxViewModel sender, SearchBoxTextChangedEventArgs e)
 		{
+			FilesystemViewModel.FilesAndFoldersFilter = sender.Query;
+			await FilesystemViewModel.ApplyFilesAndFoldersChangesAsync();
+
 			if (e.Reason != SearchBoxTextChangeReason.UserInput)
 				return;
 

src/Files.App/Views/Shells/ModernShellPage.xaml.cs

@@ -300,6 +300,8 @@ public override void NavigateHome()
 
 		public override void NavigateToPath(string? navigationPath, Type? sourcePageType, NavigationArguments? navArgs = null)
 		{
+			FilesystemViewModel.FilesAndFoldersFilter = null;
+
 			if (sourcePageType is null && !string.IsNullOrEmpty(navigationPath))
 				sourcePageType = InstanceViewModel.FolderSettings.GetLayoutType(navigationPath);