Add example for getDirectoriesPaths.

Author: eugerossetto

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

@@ -0,0 +1,87 @@
+// 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/file_selector.dart';
+import 'package:flutter/material.dart';
+
+/// Screen that allows the user to select one or more directories using `getDirectoriesPaths`,
+/// 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 getDirectoriesPaths(
+      confirmButtonText: confirmButtonText,
+    );
+    if (directoryPaths == null) {
+      // 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/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/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) => GetDirectoryPage(),
+        '/multi-directories': (BuildContext context) =>
+            const GetMultipleDirectoriesPage()
       },
     );
   }