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Merge pull request hpi-studyu#520 from hpi-studyu/feat/multimodal-rev…
…ised Feat/multimodal revised
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213 changes: 213 additions & 0 deletions
213
app/lib/screens/study/multimodal/capture_picture_screen.dart
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| Original file line number | Diff line number | Diff line change |
|---|---|---|
| @@ -0,0 +1,213 @@ | ||
| import 'dart:async'; | ||
| import 'dart:io'; | ||
|
|
||
| import 'package:camera/camera.dart'; | ||
| import 'package:flutter/material.dart'; | ||
| import 'package:flutter_gen/gen_l10n/app_localizations.dart'; | ||
| import 'package:studyu_app/util/temporary_storage_handler.dart'; | ||
|
|
||
| class CapturePictureScreen extends StatefulWidget { | ||
| final String userId; | ||
| final String studyId; | ||
|
|
||
| const CapturePictureScreen({super.key, required this.userId, required this.studyId}); | ||
|
|
||
| @override | ||
| State<CapturePictureScreen> createState() => _CapturePictureScreenState(); | ||
| } | ||
|
|
||
| class _CapturePictureScreenState extends State<CapturePictureScreen> with WidgetsBindingObserver { | ||
| CameraController? _cameraController; | ||
| List<CameraDescription>? _cameras; | ||
| int _jumpToNextCameraTaps = 0; | ||
| bool _isTakingPicture = false; | ||
|
|
||
| @override | ||
| void initState() { | ||
| super.initState(); | ||
| WidgetsBinding.instance.addObserver(this); | ||
| WidgetsBinding.instance.addPostFrameCallback((timeStamp) async { | ||
| await _initializeCameraController(); | ||
| }); | ||
| } | ||
|
|
||
| @override | ||
| void dispose() { | ||
| WidgetsBinding.instance.removeObserver(this); | ||
| _cameraController?.dispose(); | ||
| super.dispose(); | ||
| } | ||
|
|
||
| @override | ||
| void didChangeAppLifecycleState(AppLifecycleState state) async { | ||
| final CameraController? cameraController = _cameraController; | ||
|
|
||
| // App state changed before we got the chance to initialize. | ||
| if (cameraController == null || cameraController.value.isInitialized) { | ||
| return; | ||
| } | ||
|
|
||
| if (state == AppLifecycleState.inactive) { | ||
| await cameraController.dispose(); | ||
| } else if (state == AppLifecycleState.resumed) { | ||
| await _initializeCameraController(); | ||
| } | ||
| } | ||
|
|
||
| Future<void> _initializeCameraController() async { | ||
| try { | ||
| final oldCameraController = _cameraController; | ||
| final cameras = _cameras ?? await _getAvailableCameras(); | ||
| _cameras = cameras; | ||
| if (cameras.isEmpty) { | ||
| throw CameraException("NoCameraAvailable", "No cameras are available"); | ||
| } | ||
| if (oldCameraController != null) { | ||
| await oldCameraController.dispose(); | ||
| } | ||
| final cameraIndex = _jumpToNextCameraTaps % cameras.length; | ||
| final newCameraController = CameraController( | ||
| cameras[cameraIndex], | ||
| ResolutionPreset.max, | ||
| enableAudio: false, | ||
| imageFormatGroup: ImageFormatGroup.jpeg, | ||
| ); | ||
| await newCameraController.initialize(); | ||
| setState(() { | ||
| _cameraController = newCameraController; | ||
| }); | ||
| } catch (e) { | ||
| if (!mounted) return; | ||
| String errorText = AppLocalizations.of(context)!.camera_error; | ||
| if (e is CameraException) { | ||
| switch (e.code) { | ||
| case 'CameraAccessDenied': | ||
| case 'CameraAccessDeniedWithoutPrompt': | ||
| case 'CameraAccessRestricted': | ||
| errorText = AppLocalizations.of(context)!.camera_access_denied; | ||
| break; | ||
| case 'NoCameraAvailable': | ||
| errorText = AppLocalizations.of(context)!.no_camera_available; | ||
| break; | ||
| } | ||
| } | ||
|
|
||
| Navigator.of(context).pop(); | ||
| ScaffoldMessenger.of(context).showSnackBar( | ||
| SnackBar( | ||
| content: Text(errorText), | ||
| ), | ||
| ); | ||
| } | ||
| } | ||
|
|
||
| Future<List<CameraDescription>> _getAvailableCameras() async { | ||
| return (await availableCameras()) | ||
| .where((CameraDescription aCameraDescription) => | ||
| aCameraDescription.lensDirection == CameraLensDirection.back || | ||
| aCameraDescription.lensDirection == CameraLensDirection.front) | ||
| .toList(); | ||
| } | ||
|
|
||
| Future<void> _jumpToNextCamera() async { | ||
| _jumpToNextCameraTaps++; | ||
| await _initializeCameraController(); | ||
| } | ||
|
|
||
| Future<void> _tryCapturePicture() async { | ||
| final cameraController = _cameraController; | ||
| if (cameraController == null || !cameraController.value.isInitialized || cameraController.value.isTakingPicture) { | ||
| return; | ||
| } | ||
|
|
||
| setState(() { | ||
| _isTakingPicture = true; | ||
| }); | ||
|
|
||
| XFile image; | ||
| try { | ||
| image = await cameraController.takePicture(); | ||
| } on Exception catch (e) { | ||
| debugPrint("Failed to take picture: $e"); | ||
| if (!mounted) return; | ||
| ScaffoldMessenger.of(context).showSnackBar( | ||
| SnackBar( | ||
| content: Text(AppLocalizations.of(context)!.camera_error), | ||
| ), | ||
| ); | ||
| setState(() { | ||
| _isTakingPicture = false; | ||
| }); | ||
| return; | ||
| } | ||
|
|
||
| // Move the image to the staging directory | ||
| final imageFile = File(image.path); | ||
| final storage = TemporaryStorageHandler(widget.studyId, widget.userId); | ||
| final stagingImageFile = await storage.getStagingImage(); | ||
| await imageFile.rename(stagingImageFile.localFilePath); | ||
|
|
||
| if (!mounted) return; | ||
| Navigator.pop(context, stagingImageFile); | ||
| } | ||
|
|
||
| @override | ||
| Widget build(BuildContext context) { | ||
| final cameraController = _cameraController; | ||
| return Scaffold( | ||
| appBar: AppBar(title: Text(AppLocalizations.of(context)!.take_a_photo)), | ||
| body: cameraController == null | ||
| ? const Center(child: CircularProgressIndicator()) | ||
| : Stack( | ||
| children: [ | ||
| CameraPreview(cameraController), | ||
| _isTakingPicture | ||
| ? Container( | ||
| color: Colors.black.withOpacity(0.5), | ||
| alignment: Alignment.center, | ||
| child: Container( | ||
| decoration: BoxDecoration( | ||
| color: Theme.of(context).dialogBackgroundColor, | ||
| borderRadius: BorderRadius.circular(10), | ||
| ), | ||
| padding: const EdgeInsets.all(20.0), | ||
| child: Column( | ||
| mainAxisSize: MainAxisSize.min, | ||
| children: [ | ||
| const CircularProgressIndicator(), | ||
| const SizedBox(height: 16), | ||
| Text(AppLocalizations.of(context)!.take_a_photo), | ||
| ], | ||
| ), | ||
| ), | ||
| ) | ||
| : const SizedBox.shrink(), | ||
| ], | ||
| ), | ||
| floatingActionButton: Wrap( | ||
| direction: Axis.horizontal, | ||
| children: [ | ||
| Container( | ||
| margin: const EdgeInsets.all(10), | ||
| child: FloatingActionButton( | ||
| heroTag: "captureImage", | ||
| onPressed: cameraController != null && !_isTakingPicture | ||
| ? () async { | ||
| await _tryCapturePicture(); | ||
| } | ||
| : null, | ||
| child: const Icon(Icons.camera_alt), | ||
| ), | ||
| ), | ||
| Container( | ||
| margin: const EdgeInsets.all(10), | ||
| child: FloatingActionButton( | ||
| heroTag: "jumpToNextCamera", | ||
| onPressed: cameraController != null && !_isTakingPicture ? () async => await _jumpToNextCamera() : null, | ||
| child: const Icon(Icons.autorenew), | ||
| ), | ||
| ) | ||
| ], | ||
| )); | ||
| } | ||
| } |
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