Add getDirectoriesPaths to method channel.

Author: eugerossetto

packages/file_selector/file_selector_platform_interface/lib/src/method_channel/method_channel_file_selector.dart

@@ -93,4 +93,18 @@ class MethodChannelFileSelector extends FileSelectorPlatform {
       },
     );
   }
+
+  /// Gets a list of directories paths from a dialog
+  @override
+  Future<List<String>?> getDirectoriesPaths(
+      {String? initialDirectory, String? confirmButtonText}) async {
+    return _channel.invokeListMethod<String>(
+      'getDirectoriesPaths',
+      <String, dynamic>{
+        'initialDirectory': initialDirectory,
+        'confirmButtonText': confirmButtonText,
+        'multiple': true,
+      },
+    );
+  }
 }

packages/file_selector/file_selector_platform_interface/lib/src/platform_interface/file_selector_interface.dart

@@ -77,7 +77,7 @@ abstract class FileSelectorPlatform extends PlatformInterface {
 
   /// Open file dialog for loading directories and return multiple directories paths
   /// Returns `null` if user cancels the operation.
-  Future<List<String?>> getDirectoriesPaths({
+  Future<List<String>?> getDirectoriesPaths({
     String? initialDirectory,
     String? confirmButtonText,
   }) {

packages/file_selector/file_selector_platform_interface/test/method_channel_file_selector_test.dart

@@ -247,6 +247,37 @@ void main() {
           );
         });
       });
+      group('#getDirectoriesPaths', () {
+        test('passes initialDirectory correctly', () async {
+          await plugin.getDirectoriesPaths(
+              initialDirectory: '/example/directory');
+
+          expect(
+            log,
+            <Matcher>[
+              isMethodCall('getDirectoriesPaths', arguments: <String, dynamic>{
+                'initialDirectory': '/example/directory',
+                'confirmButtonText': null,
+                'multiple': true
+              }),
+            ],
+          );
+        });
+        test('passes confirmButtonText correctly', () async {
+          await plugin.getDirectoriesPaths(confirmButtonText: 'Open File');
+
+          expect(
+            log,
+            <Matcher>[
+              isMethodCall('getDirectoriesPaths', arguments: <String, dynamic>{
+                'initialDirectory': null,
+                'confirmButtonText': 'Open File',
+                'multiple': true
+              }),
+            ],
+          );
+        });
+      });
     });
   });
 }