Add FolderProvider

Toolkit.Avalonia/FileProvider.cs

@@ -11,21 +11,21 @@ public class FileProvider(ITopLevelProvider topLevelProvider) :
     {
         if (topLevelProvider.Get() is TopLevel topLevel)
         {
-            IReadOnlyList<IStorageFile> storageFiles = await topLevel.StorageProvider.OpenFilePickerAsync(new FilePickerOpenOptions()
+            IReadOnlyList<IStorageFile> files = await topLevel.StorageProvider.OpenFilePickerAsync(new FilePickerOpenOptions()
             {
                 AllowMultiple = filter.AllowMultiple,
-                FileTypeFilter = new List<FilePickerFileType>
-                {
+                FileTypeFilter =
+                [
                     new(filter.Name)
                     {
                         Patterns = filter.Extensions is { Count: > 0 } ? filter.Extensions.Select(x => $"*.{x}").ToList() : ["*.*"]
                     }
-                }
+                ]
             });
 
-            return storageFiles.Select(file => file.Path.LocalPath).ToList();
+            return files.Select(x => x.Path.LocalPath).ToList();
         }
 
-        return Array.Empty<string>();
+        return [];
     }
 }

Toolkit.Avalonia/FolderProvider.cs

@@ -0,0 +1,25 @@
+using Avalonia.Controls;
+using Avalonia.Platform.Storage;
+using Toolkit.Foundation;
+
+namespace Toolkit.Avalonia;
+
+public class FolderProvider(ITopLevelProvider topLevelProvider) :
+    IFolderProvider
+{
+    public async Task<IReadOnlyCollection<string>> SelectFolders(FolderFilter filter)
+    {
+        if (topLevelProvider.Get() is TopLevel topLevel)
+        {
+            IReadOnlyList<IStorageFolder> folders = await topLevel.StorageProvider.OpenFolderPickerAsync(new FolderPickerOpenOptions()
+            {
+                AllowMultiple = filter.AllowMultiple  
+            });
+
+
+            return folders.Select(x => x.Path.LocalPath).ToList();
+        }
+
+        return [];
+    }
+}

Toolkit.Avalonia/IServiceCollectionExtensions.cs

@@ -126,6 +126,7 @@ public static class IServiceCollectionExtensions
     {
         services.AddTransient<ITopLevelProvider, TopLevelProvider>();
         services.AddTransient<IFileProvider, FileProvider>();
+        services.AddTransient<IFolderProvider, FolderProvider>();
 
         services.AddTransient<IClipboardWriter, ClipboardWriter>();
 
@@ -139,6 +140,7 @@ public static class IServiceCollectionExtensions
         services.AddTransient<INavigationRegion, NavigationRegion>();
 
         services.AddHandler<WriteClipboardHandler>();
+        services.AddHandler<SelectFoldersHandler>();
 
         services.AddHandler<ClassicDesktopStyleApplicationHandler>(nameof(IClassicDesktopStyleApplicationLifetime));
         services.AddHandler<SingleViewApplicationHandler>(nameof(ISingleViewApplicationLifetime));
@@ -157,6 +159,7 @@ public static class IServiceCollectionExtensions
             {
                 services.AddTransient<ITopLevelProvider, TopLevelProvider>();
                 services.AddTransient<IFileProvider, FileProvider>();
+                services.AddTransient<IFolderProvider, FolderProvider>();
 
                 services.AddTransient<IClipboardWriter, ClipboardWriter>();
 
@@ -170,6 +173,7 @@ public static class IServiceCollectionExtensions
                 services.AddTransient<INavigationRegion, NavigationRegion>();
 
                 services.AddHandler<WriteClipboardHandler>();
+                services.AddHandler<SelectFoldersHandler>();
 
                 services.AddHandler<ContentControlHandler>(nameof(ContentControl));
                 services.AddHandler<FrameHandler>(nameof(Frame));