[camera] Fix memory leaks in example and activate leak testing (#8287)

Author: ValentinVignal

packages/camera/camera/CHANGELOG.md

@@ -1,6 +1,7 @@
 ## NEXT
 
 * Updates minimum supported SDK version to Flutter 3.22/Dart 3.4.
+* Updates example to dispose animation controllers and curved animations.
 
 ## 0.11.0+2
 

packages/camera/camera/example/lib/main.dart

@@ -54,12 +54,12 @@ class _CameraExampleHomeState extends State<CameraExampleHome>
   double _minAvailableExposureOffset = 0.0;
   double _maxAvailableExposureOffset = 0.0;
   double _currentExposureOffset = 0.0;
-  late AnimationController _flashModeControlRowAnimationController;
-  late Animation<double> _flashModeControlRowAnimation;
-  late AnimationController _exposureModeControlRowAnimationController;
-  late Animation<double> _exposureModeControlRowAnimation;
-  late AnimationController _focusModeControlRowAnimationController;
-  late Animation<double> _focusModeControlRowAnimation;
+  late final AnimationController _flashModeControlRowAnimationController;
+  late final CurvedAnimation _flashModeControlRowAnimation;
+  late final AnimationController _exposureModeControlRowAnimationController;
+  late final CurvedAnimation _exposureModeControlRowAnimation;
+  late final AnimationController _focusModeControlRowAnimationController;
+  late final CurvedAnimation _focusModeControlRowAnimation;
   double _minAvailableZoom = 1.0;
   double _maxAvailableZoom = 1.0;
   double _currentScale = 1.0;
@@ -103,7 +103,11 @@ class _CameraExampleHomeState extends State<CameraExampleHome>
   void dispose() {
     WidgetsBinding.instance.removeObserver(this);
     _flashModeControlRowAnimationController.dispose();
+    _flashModeControlRowAnimation.dispose();
     _exposureModeControlRowAnimationController.dispose();
+    _exposureModeControlRowAnimation.dispose();
+    _focusModeControlRowAnimationController.dispose();
+    _focusModeControlRowAnimation.dispose();
     super.dispose();
   }
 

packages/camera/camera/example/pubspec.yaml

@@ -27,6 +27,7 @@ dev_dependencies:
     sdk: flutter
   integration_test:
     sdk: flutter
+  leak_tracker_flutter_testing: any
 
 flutter:
   uses-material-design: true

packages/camera/camera/example/test/flutter_test_config.dart

@@ -0,0 +1,13 @@
+// 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 'dart:async';
+
+import 'package:leak_tracker_flutter_testing/leak_tracker_flutter_testing.dart';
+
+Future<void> testExecutable(FutureOr<void> Function() testMain) async {
+  LeakTesting.enable();
+  LeakTracking.warnForUnsupportedPlatforms = false;
+  await testMain();
+}

packages/camera/camera/pubspec.yaml

@@ -32,6 +32,7 @@ dependencies:
 dev_dependencies:
   flutter_test:
     sdk: flutter
+  leak_tracker_flutter_testing: any
   mockito: ^5.4.4
   plugin_platform_interface: ^2.1.7
 

packages/camera/camera/test/camera_preview_test.dart

@@ -144,6 +144,7 @@ void main() {
       debugDefaultTargetPlatformOverride = TargetPlatform.android;
 
       final FakeController controller = FakeController();
+      addTearDown(controller.dispose);
       controller.value = controller.value.copyWith(
         isInitialized: true,
         isRecordingVideo: true,
@@ -179,6 +180,7 @@ void main() {
       debugDefaultTargetPlatformOverride = TargetPlatform.android;
 
       final FakeController controller = FakeController();
+      addTearDown(controller.dispose);
       controller.value = controller.value.copyWith(
         isInitialized: true,
         deviceOrientation: DeviceOrientation.portraitUp,
@@ -213,6 +215,7 @@ void main() {
       debugDefaultTargetPlatformOverride = TargetPlatform.android;
 
       final FakeController controller = FakeController();
+      addTearDown(controller.dispose);
       controller.value = controller.value.copyWith(
         isInitialized: true,
         deviceOrientation: DeviceOrientation.portraitUp,
@@ -241,6 +244,7 @@ void main() {
       (WidgetTester tester) async {
     debugDefaultTargetPlatformOverride = TargetPlatform.iOS;
     final FakeController controller = FakeController();
+    addTearDown(controller.dispose);
     controller.value = controller.value.copyWith(
       isInitialized: true,
       previewSize: const Size(480, 640),

packages/camera/camera/test/flutter_test_config.dart

@@ -0,0 +1,13 @@
+// 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 'dart:async';
+
+import 'package:leak_tracker_flutter_testing/leak_tracker_flutter_testing.dart';
+
+Future<void> testExecutable(FutureOr<void> Function() testMain) async {
+  LeakTesting.enable();
+  LeakTracking.warnForUnsupportedPlatforms = false;
+  await testMain();
+}