add getDirectoriesPath implementation

add dart and native tests

add example

apply feedback

Author: adpinola

packages/file_selector/file_selector_linux/.gitignore

@@ -3,3 +3,7 @@
 .flutter-plugins
 .flutter-plugins-dependencies
 pubspec.lock
+
+# Linux specific
+linux/CMakeFiles
+linux/CMakeCache.txt

packages/file_selector/file_selector_linux/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 0.9.0+2
+
+* Adds `getDirectoryPaths` implementation.
+
 ## 0.9.0+1
 
 * Changes XTypeGroup initialization from final to const.

packages/file_selector/file_selector_linux/example/lib/get_multiple_directories_page.dart

@@ -0,0 +1,88 @@
+// Copyright 2013 The Flutter Authors. All rights reserved.
+// Use of this source code is governed by a BSD-style license that can be
+// found in the LICENSE file.
+
+import 'package:file_selector_platform_interface/file_selector_platform_interface.dart';
+import 'package:flutter/material.dart';
+
+/// Screen that allows the user to select one or more directories using `getDirectoryPaths`,
+/// then displays the selected directories in a dialog.
+class GetMultipleDirectoriesPage extends StatelessWidget {
+  /// Default Constructor
+  const GetMultipleDirectoriesPage({Key? key}) : super(key: key);
+
+  Future<void> _getDirectoryPaths(BuildContext context) async {
+    const String confirmButtonText = 'Choose';
+    final List<String> directoryPaths =
+        await FileSelectorPlatform.instance.getDirectoryPaths(
+      confirmButtonText: confirmButtonText,
+    );
+    if (directoryPaths.isEmpty) {
+      // Operation was canceled by the user.
+      return;
+    }
+    String paths = '';
+    for (final String? path in directoryPaths) {
+      paths += '${path!} \n';
+    }
+    await showDialog<void>(
+      context: context,
+      builder: (BuildContext context) => TextDisplay(paths),
+    );
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return Scaffold(
+      appBar: AppBar(
+        title: const Text('Select multiple directories'),
+      ),
+      body: Center(
+        child: Column(
+          mainAxisAlignment: MainAxisAlignment.center,
+          children: <Widget>[
+            ElevatedButton(
+              style: ElevatedButton.styleFrom(
+                // TODO(darrenaustin): Migrate to new API once it lands in stable: https://github.com/flutter/flutter/issues/105724
+                // ignore: deprecated_member_use
+                primary: Colors.blue,
+                // ignore: deprecated_member_use
+                onPrimary: Colors.white,
+              ),
+              child: const Text(
+                  'Press to ask user to choose multiple directories'),
+              onPressed: () => _getDirectoryPaths(context),
+            ),
+          ],
+        ),
+      ),
+    );
+  }
+}
+
+/// Widget that displays a text file in a dialog.
+class TextDisplay extends StatelessWidget {
+  /// Creates a `TextDisplay`.
+  const TextDisplay(this.directoriesPaths, {Key? key}) : super(key: key);
+
+  /// The path selected in the dialog.
+  final String directoriesPaths;
+
+  @override
+  Widget build(BuildContext context) {
+    return AlertDialog(
+      title: const Text('Selected Directories'),
+      content: Scrollbar(
+        child: SingleChildScrollView(
+          child: Text(directoriesPaths),
+        ),
+      ),
+      actions: <Widget>[
+        TextButton(
+          child: const Text('Close'),
+          onPressed: () => Navigator.pop(context),
+        ),
+      ],
+    );
+  }
+}

packages/file_selector/file_selector_linux/example/lib/home_page.dart

@@ -55,6 +55,13 @@ class HomePage extends StatelessWidget {
               child: const Text('Open a get directory dialog'),
               onPressed: () => Navigator.pushNamed(context, '/directory'),
             ),
+            const SizedBox(height: 10),
+            ElevatedButton(
+              style: style,
+              child: const Text('Open a get multi directories dialog'),
+              onPressed: () =>
+                  Navigator.pushNamed(context, '/multi-directories'),
+            ),
           ],
         ),
       ),

packages/file_selector/file_selector_linux/example/lib/main.dart

@@ -5,6 +5,7 @@
 import 'package:flutter/material.dart';
 
 import 'get_directory_page.dart';
+import 'get_multiple_directories_page.dart';
 import 'home_page.dart';
 import 'open_image_page.dart';
 import 'open_multiple_images_page.dart';
@@ -36,6 +37,8 @@ class MyApp extends StatelessWidget {
         '/open/text': (BuildContext context) => const OpenTextPage(),
         '/save/text': (BuildContext context) => SaveTextPage(),
         '/directory': (BuildContext context) => const GetDirectoryPage(),
+        '/multi-directories': (BuildContext context) =>
+            const GetMultipleDirectoriesPage()
       },
     );
   }

packages/file_selector/file_selector_linux/example/pubspec.yaml

@@ -1,6 +1,6 @@
 name: file_selector_linux_example
 description: Local testbed for Linux file_selector implementation.
-publish_to: 'none' # Remove this line if you wish to publish to pub.dev
+publish_to: 'none'
 version: 1.0.0+1
 
 environment:
@@ -9,7 +9,9 @@ environment:
 dependencies:
   file_selector_linux:
     path: ../
-  file_selector_platform_interface: ^2.2.0
+  # TODO(adpinola): This should be 2.4.0 once it is published.
+  file_selector_platform_interface:
+    path: ../../file_selector_platform_interface/
   flutter:
     sdk: flutter
 

packages/file_selector/file_selector_linux/lib/file_selector_linux.dart

@@ -102,13 +102,26 @@ class FileSelectorLinux extends FileSelectorPlatform {
     String? initialDirectory,
     String? confirmButtonText,
   }) async {
-    return _channel.invokeMethod<String>(
-      _getDirectoryPathMethod,
-      <String, dynamic>{
-        _initialDirectoryKey: initialDirectory,
-        _confirmButtonTextKey: confirmButtonText,
-      },
-    );
+    final List<String>? path = await _channel
+        .invokeListMethod<String>(_getDirectoryPathMethod, <String, dynamic>{
+      _initialDirectoryKey: initialDirectory,
+      _confirmButtonTextKey: confirmButtonText,
+    });
+    return path?.first;
+  }
+
+  @override
+  Future<List<String>> getDirectoryPaths({
+    String? initialDirectory,
+    String? confirmButtonText,
+  }) async {
+    final List<String>? pathList = await _channel
+        .invokeListMethod<String>(_getDirectoryPathMethod, <String, dynamic>{
+      _initialDirectoryKey: initialDirectory,
+      _confirmButtonTextKey: confirmButtonText,
+      _multipleKey: true,
+    });
+    return pathList ?? <String>[];
   }
 }
 

packages/file_selector/file_selector_linux/linux/file_selector_plugin.cc

@@ -192,10 +192,10 @@ static void method_call_cb(FlMethodChannel* channel, FlMethodCall* method_call,
   FlValue* args = fl_method_call_get_args(method_call);
 
   g_autoptr(FlMethodResponse) response = nullptr;
-  if (strcmp(method, kOpenFileMethod) == 0) {
+  if (strcmp(method, kOpenFileMethod) == 0 ||
+      strcmp(method, kGetDirectoryPathMethod) == 0) {
     response = show_dialog(self, method, args, true);
-  } else if (strcmp(method, kGetDirectoryPathMethod) == 0 ||
-             strcmp(method, kGetSavePathMethod) == 0) {
+  } else if (strcmp(method, kGetSavePathMethod) == 0) {
     response = show_dialog(self, method, args, false);
   } else {
     response = FL_METHOD_RESPONSE(fl_method_not_implemented_response_new());

packages/file_selector/file_selector_linux/linux/test/file_selector_plugin_test.cc

@@ -169,3 +169,17 @@ TEST(FileSelectorPlugin, TestGetDirectory) {
   EXPECT_EQ(gtk_file_chooser_get_select_multiple(GTK_FILE_CHOOSER(dialog)),
             false);
 }
+
+TEST(FileSelectorPlugin, TestGetMultipleDirectories) {
+  g_autoptr(FlValue) args = fl_value_new_map();
+  fl_value_set_string_take(args, "multiple", fl_value_new_bool(true));
+
+  g_autoptr(GtkFileChooserNative) dialog =
+      create_dialog_for_method(nullptr, "getDirectoryPath", args);
+
+  ASSERT_NE(dialog, nullptr);
+  EXPECT_EQ(gtk_file_chooser_get_action(GTK_FILE_CHOOSER(dialog)),
+            GTK_FILE_CHOOSER_ACTION_SELECT_FOLDER);
+  EXPECT_EQ(gtk_file_chooser_get_select_multiple(GTK_FILE_CHOOSER(dialog)),
+            true);
+}

packages/file_selector/file_selector_linux/pubspec.yaml

@@ -2,7 +2,7 @@ name: file_selector_linux
 description: Liunx implementation of the file_selector plugin.
 repository: https://github.com/flutter/plugins/tree/main/packages/file_selector/file_selector_linux
 issue_tracker: https://github.com/flutter/flutter/issues?q=is%3Aissue+is%3Aopen+label%3A%22p%3A+file_selector%22
-version: 0.9.0+1
+version: 0.9.0+2
 
 environment:
   sdk: ">=2.12.0 <3.0.0"
@@ -18,7 +18,9 @@ flutter:
 
 dependencies:
   cross_file: ^0.3.1
-  file_selector_platform_interface: ^2.2.0
+  # TODO(adpinola): This should be 2.4.0 once it is published.
+  file_selector_platform_interface:
+    path: ../file_selector_platform_interface
   flutter:
     sdk: flutter
 

packages/file_selector/file_selector_linux/test/file_selector_linux_test.dart

@@ -373,14 +373,60 @@ void main() {
       );
     });
     test('passes confirmButtonText correctly', () async {
-      await plugin.getDirectoryPath(confirmButtonText: 'Open File');
+      await plugin.getDirectoryPath(confirmButtonText: 'Select Folder');
 
       expect(
         log,
         <Matcher>[
           isMethodCall('getDirectoryPath', arguments: <String, dynamic>{
             'initialDirectory': null,
-            'confirmButtonText': 'Open File',
+            'confirmButtonText': 'Select Folder',
+          }),
+        ],
+      );
+    });
+  });
+
+  group('#getDirectoryPaths', () {
+    test('passes initialDirectory correctly', () async {
+      await plugin.getDirectoryPaths(initialDirectory: '/example/directory');
+
+      expect(
+        log,
+        <Matcher>[
+          isMethodCall('getDirectoryPath', arguments: <String, dynamic>{
+            'initialDirectory': '/example/directory',
+            'confirmButtonText': null,
+            'multiple': true,
+          }),
+        ],
+      );
+    });
+    test('passes confirmButtonText correctly', () async {
+      await plugin.getDirectoryPaths(
+          confirmButtonText: 'Select one or mode folders');
+
+      expect(
+        log,
+        <Matcher>[
+          isMethodCall('getDirectoryPath', arguments: <String, dynamic>{
+            'initialDirectory': null,
+            'confirmButtonText': 'Select one or mode folders',
+            'multiple': true,
+          }),
+        ],
+      );
+    });
+    test('passes multiple flag correctly', () async {
+      await plugin.getDirectoryPaths();
+
+      expect(
+        log,
+        <Matcher>[
+          isMethodCall('getDirectoryPath', arguments: <String, dynamic>{
+            'initialDirectory': null,
+            'confirmButtonText': null,
+            'multiple': true,
           }),
         ],
       );