[camera] Fix preview pause orientation (flutter#5209)

Author: cassioso

packages/camera/camera/CHANGELOG.md

@@ -1,3 +1,7 @@
+## 0.9.4+24
+
+* Fixes preview orientation when pausing preview with locked orientation.
+
 ## 0.9.4+23
 
 * Minor fixes for new analysis options.

packages/camera/camera/lib/src/camera_controller.dart

@@ -359,8 +359,8 @@ class CameraController extends ValueNotifier<CameraValue> {
       await CameraPlatform.instance.pausePreview(_cameraId);
       value = value.copyWith(
           isPreviewPaused: true,
-          previewPauseOrientation:
-              Optional<DeviceOrientation>.of(value.deviceOrientation));
+          previewPauseOrientation: Optional<DeviceOrientation>.of(
+              value.lockedCaptureOrientation ?? value.deviceOrientation));
     } on PlatformException catch (e) {
       throw CameraException(e.code, e.message);
     }
@@ -520,7 +520,7 @@ class CameraController extends ValueNotifier<CameraValue> {
       value = value.copyWith(
           isRecordingVideo: true,
           isRecordingPaused: false,
-          recordingOrientation: Optional<DeviceOrientation>.fromNullable(
+          recordingOrientation: Optional<DeviceOrientation>.of(
               value.lockedCaptureOrientation ?? value.deviceOrientation));
     } on PlatformException catch (e) {
       throw CameraException(e.code, e.message);
@@ -762,7 +762,7 @@ class CameraController extends ValueNotifier<CameraValue> {
       await CameraPlatform.instance.lockCaptureOrientation(
           _cameraId, orientation ?? value.deviceOrientation);
       value = value.copyWith(
-          lockedCaptureOrientation: Optional<DeviceOrientation>.fromNullable(
+          lockedCaptureOrientation: Optional<DeviceOrientation>.of(
               orientation ?? value.deviceOrientation));
     } on PlatformException catch (e) {
       throw CameraException(e.code, e.message);

packages/camera/camera/pubspec.yaml

@@ -4,7 +4,7 @@ description: A Flutter plugin for controlling the camera. Supports previewing
   Dart.
 repository: https://github.com/flutter/plugins/tree/main/packages/camera/camera
 issue_tracker: https://github.com/flutter/flutter/issues?q=is%3Aissue+is%3Aopen+label%3A%22p%3A+camera%22
-version: 0.9.4+23
+version: 0.9.4+24
 
 environment:
   sdk: ">=2.14.0 <3.0.0"

packages/camera/camera/test/camera_test.dart

@@ -13,6 +13,7 @@ import 'package:flutter/widgets.dart';
 import 'package:flutter_test/flutter_test.dart';
 import 'package:mockito/mockito.dart';
 import 'package:plugin_platform_interface/plugin_platform_interface.dart';
+import 'package:quiver/core.dart';
 
 List<CameraDescription> get mockAvailableCameras => <CameraDescription>[
       const CameraDescription(
@@ -1180,6 +1181,30 @@ void main() {
       expect(cameraController.value.isPreviewPaused, equals(true));
     });
 
+    test(
+        'pausePreview() sets previewPauseOrientation according to locked orientation',
+        () async {
+      final CameraController cameraController = CameraController(
+          const CameraDescription(
+              name: 'cam',
+              lensDirection: CameraLensDirection.back,
+              sensorOrientation: 90),
+          ResolutionPreset.max);
+      await cameraController.initialize();
+      cameraController.value = cameraController.value.copyWith(
+          isPreviewPaused: false,
+          deviceOrientation: DeviceOrientation.portraitUp,
+          lockedCaptureOrientation:
+              Optional<DeviceOrientation>.of(DeviceOrientation.landscapeRight));
+
+      await cameraController.pausePreview();
+
+      expect(cameraController.value.deviceOrientation,
+          equals(DeviceOrientation.portraitUp));
+      expect(cameraController.value.previewPauseOrientation,
+          equals(DeviceOrientation.landscapeRight));
+    });
+
     test('pausePreview() throws $CameraException on $PlatformException',
         () async {
       final CameraController cameraController = CameraController(