679 lines
23 KiB
Dart
679 lines
23 KiB
Dart
import 'dart:async';
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import 'package:flutter/material.dart';
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import 'package:flutter/foundation.dart';
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import 'package:camera/camera.dart';
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import 'package:file_picker/file_picker.dart';
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import 'package:file_selector/file_selector.dart' as fsel;
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import 'package:votianlt_app/services/developer.dart' as developer;
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import '../l10n/app_localizations.dart';
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import '../models/tasks/photo_task.dart';
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import '../widgets/offline_banner.dart';
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class PhotoCaptureScreen extends StatefulWidget {
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final PhotoTask task;
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final Function(List<Uint8List>) onPhotosCompleted;
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const PhotoCaptureScreen({
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super.key,
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required this.task,
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required this.onPhotosCompleted,
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});
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@override
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State<PhotoCaptureScreen> createState() => _PhotoCaptureScreenState();
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}
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class _PhotoCaptureScreenState extends State<PhotoCaptureScreen> {
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CameraController? _cameraController; // Android/iOS/Web
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List<CameraDescription>? _cameras;
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final List<Uint8List> _capturedPhotos = [];
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final PageController _pageController = PageController();
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int _currentPhotoIndex = 0;
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bool _isCameraInitialized = false;
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bool _isCameraSupportedOnThisPlatform = false;
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bool _useFilePickerMode = false; // desktop fallback
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@override
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void initState() {
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super.initState();
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_detectPlatformSupportAndInit();
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}
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@override
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void dispose() {
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_cameraController?.dispose();
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_pageController.dispose();
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super.dispose();
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}
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void _detectPlatformSupportAndInit() {
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// Requirement: Desktop (macOS/Windows/Linux) uses file picker; Android/iOS uses camera.
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if (kIsWeb) {
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// Keep web behavior using camera if available
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_isCameraSupportedOnThisPlatform = true;
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_initializeCamera();
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return;
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}
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switch (defaultTargetPlatform) {
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case TargetPlatform.android:
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case TargetPlatform.iOS:
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_isCameraSupportedOnThisPlatform = true; // enable capture button
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_useFilePickerMode = false;
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_initializeCamera();
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return;
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case TargetPlatform.macOS:
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case TargetPlatform.windows:
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case TargetPlatform.linux:
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// Desktop → use file picker instead of camera
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_isCameraSupportedOnThisPlatform = true; // enable button
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_useFilePickerMode = true;
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return;
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default:
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_isCameraSupportedOnThisPlatform = false;
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}
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}
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Future<void> _initializeCamera() async {
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try {
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// Android/iOS/Web camera initialization
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_cameras = await availableCameras();
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if (_cameras != null && _cameras!.isNotEmpty) {
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_cameraController = CameraController(
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_cameras![0],
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ResolutionPreset.medium,
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);
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await _cameraController!.initialize();
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if (mounted) {
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setState(() {
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_isCameraInitialized = true;
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});
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}
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}
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} catch (e, stackTrace) {
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developer.log('Error initializing camera: $e', name: 'PhotoCaptureScreen');
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developer.log('Stack trace: $stackTrace', name: 'PhotoCaptureScreen');
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if (mounted) {
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ScaffoldMessenger.of(context).showSnackBar(
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SnackBar(content: Text('${AppLocalizations.of(context).cameraError}: $e')),
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);
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}
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}
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}
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Future<void> _capturePhoto() async {
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try {
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// Camera plugin path (Android/iOS/Web)
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if (_cameraController != null && _isCameraInitialized) {
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final XFile photo = await _cameraController!.takePicture();
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final Uint8List photoBytes = await photo.readAsBytes();
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setState(() {
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_capturedPhotos.add(photoBytes);
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});
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// Navigate to the newly added photo (even if it's the first one). If the
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// PageView is not attached yet, _showPhotoAt will schedule a post-frame jump.
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_showPhotoAt(_capturedPhotos.length - 1);
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} else {
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if (mounted) {
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ScaffoldMessenger.of(context).showSnackBar(
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SnackBar(content: Text(AppLocalizations.of(context).cameraNotReady)),
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);
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}
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}
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} catch (e, stackTrace) {
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developer.log('Error capturing photo: $e', name: 'PhotoCaptureScreen');
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developer.log('Stack trace: $stackTrace', name: 'PhotoCaptureScreen');
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if (mounted) {
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ScaffoldMessenger.of(context).showSnackBar(
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SnackBar(content: Text('${AppLocalizations.of(context).photoError}: $e')),
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);
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}
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}
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}
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Future<void> _pickPhotoFromFile() async {
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try {
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// Use file_selector for desktop and web for robust platform support
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final bool useFileSelector = kIsWeb ||
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defaultTargetPlatform == TargetPlatform.macOS ||
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defaultTargetPlatform == TargetPlatform.windows ||
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defaultTargetPlatform == TargetPlatform.linux;
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if (useFileSelector) {
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final typeGroup = fsel.XTypeGroup(
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label: 'images',
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extensions: ['jpg', 'jpeg', 'png', 'heic', 'bmp', 'gif', 'webp'],
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);
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final fsel.XFile? picked = await fsel.openFile(acceptedTypeGroups: [typeGroup]);
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if (picked != null) {
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final data = await picked.readAsBytes();
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setState(() {
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_capturedPhotos.add(data);
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});
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_showPhotoAt(_capturedPhotos.length - 1);
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}
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} else {
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// On Android/iOS, use file_picker which integrates with platform pickers
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final result = await FilePicker.platform.pickFiles(
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allowMultiple: false,
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type: FileType.image,
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withData: true,
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);
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if (result != null && result.files.isNotEmpty) {
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final file = result.files.first;
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final bytes = file.bytes;
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if (bytes != null) {
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setState(() {
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_capturedPhotos.add(bytes);
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});
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_showPhotoAt(_capturedPhotos.length - 1);
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} else {
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// On some platforms, bytes may be null if withData was false; try path
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final path = file.path;
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if (path != null) {
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final data = await XFile(path).readAsBytes();
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setState(() {
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_capturedPhotos.add(data);
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});
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if (_capturedPhotos.length > 1) {
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_showPhotoAt(_capturedPhotos.length - 1);
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}
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}
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}
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}
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}
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} catch (e, stackTrace) {
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developer.log('Error picking photo from file: $e', name: 'PhotoCaptureScreen');
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developer.log('Stack trace: $stackTrace', name: 'PhotoCaptureScreen');
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if (mounted) {
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ScaffoldMessenger.of(context).showSnackBar(
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SnackBar(content: Text('${AppLocalizations.of(context).photoError}: $e')),
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);
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}
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}
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}
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void _deletePhoto(int index) {
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showDialog(
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context: context,
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builder: (BuildContext context) {
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return AlertDialog(
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title: Text(AppLocalizations.of(context).deletePhoto),
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content: Text(AppLocalizations.of(context).deletePhotoConfirm),
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actions: [
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TextButton(
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onPressed: () => Navigator.of(context).pop(),
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child: Text(AppLocalizations.of(context).cancel),
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),
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ElevatedButton(
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onPressed: () {
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Navigator.of(context).pop();
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// Remove and navigate to a valid photo if any remain
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int targetIndex = _currentPhotoIndex;
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setState(() {
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_capturedPhotos.removeAt(index);
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if (_capturedPhotos.isEmpty) {
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_currentPhotoIndex = 0;
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} else {
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if (targetIndex >= _capturedPhotos.length) {
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targetIndex = _capturedPhotos.length - 1;
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}
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_currentPhotoIndex = targetIndex;
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}
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});
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if (_capturedPhotos.isNotEmpty) {
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_showPhotoAt(_currentPhotoIndex);
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}
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},
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style: ElevatedButton.styleFrom(backgroundColor: Colors.red),
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child: Text(AppLocalizations.of(context).delete, style: const TextStyle(color: Colors.white)),
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),
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],
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);
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},
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);
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}
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bool get _canComplete {
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return _capturedPhotos.length >= widget.task.minPhotoCount &&
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_capturedPhotos.length <= widget.task.maxPhotoCount;
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}
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bool get _canTakeMore {
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return _capturedPhotos.length < widget.task.maxPhotoCount;
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}
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bool get _isDesktopPlatform {
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if (kIsWeb) return false;
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switch (defaultTargetPlatform) {
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case TargetPlatform.macOS:
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case TargetPlatform.windows:
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case TargetPlatform.linux:
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return true;
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default:
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return false;
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}
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}
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void _showPhotoAt(int index) {
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if (_capturedPhotos.isEmpty) return;
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final int clamped = index.clamp(0, _capturedPhotos.length - 1);
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if (!mounted) return;
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// Always schedule navigation after the current frame so that
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// PageView has rebuilt with the latest itemCount before we jump/animate.
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WidgetsBinding.instance.addPostFrameCallback((_) {
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if (!mounted) return;
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if (_pageController.hasClients) {
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try {
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_pageController.animateToPage(
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clamped,
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duration: const Duration(milliseconds: 250),
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curve: Curves.easeInOut,
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);
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} catch (e, stackTrace) {
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developer.log('Error animating to page: $e', name: 'PhotoCaptureScreen');
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developer.log('Stack trace: $stackTrace', name: 'PhotoCaptureScreen');
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_pageController.jumpToPage(clamped);
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}
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setState(() {
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_currentPhotoIndex = clamped;
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});
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}
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});
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}
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void _goToPreviousPhoto() {
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if (_currentPhotoIndex > 0) {
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_showPhotoAt(_currentPhotoIndex - 1);
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}
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}
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void _goToNextPhoto() {
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if (_currentPhotoIndex < _capturedPhotos.length - 1) {
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_showPhotoAt(_currentPhotoIndex + 1);
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}
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}
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@override
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Widget build(BuildContext context) {
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return Scaffold(
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appBar: AppBar(
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title: Text(AppLocalizations.of(context).photoCapture),
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backgroundColor: Colors.blue,
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foregroundColor: Colors.white,
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actions: [
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if (_canComplete)
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TextButton(
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onPressed: () {
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widget.onPhotosCompleted(_capturedPhotos);
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Navigator.of(context).pop();
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},
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child: Text(
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AppLocalizations.of(context).finish,
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style: TextStyle(color: Colors.white, fontWeight: FontWeight.bold),
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),
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),
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],
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),
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body: Column(
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children: [
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OfflineBanner(),
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// Task info header
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Container(
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width: double.infinity,
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padding: EdgeInsets.all(16),
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color: Colors.grey[100],
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child: Column(
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crossAxisAlignment: CrossAxisAlignment.start,
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children: [
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Text(
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'${AppLocalizations.of(context).requiredPhotos}: ${widget.task.minPhotoCount}-${widget.task.maxPhotoCount}',
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style: TextStyle(fontSize: 16, fontWeight: FontWeight.bold),
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),
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Text(
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'${AppLocalizations.of(context).photosTaken}: ${_capturedPhotos.length}',
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style: TextStyle(fontSize: 14, color: Colors.grey[600]),
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),
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],
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),
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),
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// Camera preview, photo gallery or empty state
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Expanded(
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child: _capturedPhotos.isEmpty
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? _buildCameraOrEmptyState()
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: _buildPhotoGallery(),
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),
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// Bottom controls
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Container(
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padding: EdgeInsets.all(16),
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decoration: BoxDecoration(
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color: Colors.white,
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boxShadow: [
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BoxShadow(
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color: Colors.grey.withValues(alpha: 0.3),
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spreadRadius: 1,
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blurRadius: 5,
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offset: Offset(0, -3),
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),
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],
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),
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child: Column(
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crossAxisAlignment: CrossAxisAlignment.stretch,
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children: [
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Row(
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children: [
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// Camera or file select button
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Expanded(
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child: ElevatedButton.icon(
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onPressed: _canTakeMore && _isCameraSupportedOnThisPlatform
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? (_useFilePickerMode
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? _pickPhotoFromFile
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: (_isCameraInitialized ? _capturePhoto : null))
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: null,
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icon: Icon(_useFilePickerMode ? Icons.photo_library : Icons.camera_alt),
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label: Text(
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!_isCameraSupportedOnThisPlatform
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? AppLocalizations.of(context).cameraNotSupportedOnPlatform
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: (!_canTakeMore
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? AppLocalizations.of(context).maxPhotosReached
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: (_useFilePickerMode
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? AppLocalizations.of(context).selectPhoto
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: (_isCameraInitialized ? AppLocalizations.of(context).takePhoto : (defaultTargetPlatform == TargetPlatform.macOS ? AppLocalizations.of(context).cameraReadyNoPreview : AppLocalizations.of(context).cameraLoading)))),
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),
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style: ElevatedButton.styleFrom(
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backgroundColor: _canTakeMore && (_useFilePickerMode || _isCameraInitialized) ? Colors.blue : Colors.grey,
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foregroundColor: Colors.white,
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padding: EdgeInsets.symmetric(vertical: 12),
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),
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),
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),
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if (_capturedPhotos.isNotEmpty) ...[
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SizedBox(width: 16),
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// Delete current photo button
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ElevatedButton.icon(
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onPressed: () => _deletePhoto(_currentPhotoIndex),
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icon: Icon(Icons.delete),
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label: Text(AppLocalizations.of(context).delete),
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style: ElevatedButton.styleFrom(
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backgroundColor: Colors.red,
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foregroundColor: Colors.white,
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padding: EdgeInsets.symmetric(vertical: 12, horizontal: 16),
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),
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),
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],
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],
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),
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SizedBox(height: 12),
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// Bottom 'Fertig' button placed under the row
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SizedBox(
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width: double.infinity,
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child: ElevatedButton(
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onPressed: _canComplete
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? () {
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widget.onPhotosCompleted(_capturedPhotos);
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Navigator.of(context).pop();
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}
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: null,
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style: ElevatedButton.styleFrom(
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backgroundColor: _canComplete ? Colors.green : Colors.grey,
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foregroundColor: Colors.white,
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padding: EdgeInsets.symmetric(vertical: 14),
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),
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child: Text(AppLocalizations.of(context).finish, style: const TextStyle(fontWeight: FontWeight.bold)),
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),
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),
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],
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),
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),
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],
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),
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);
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}
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Widget _buildCameraOrEmptyState() {
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// If platform not supported, show informative message
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if (!_isCameraSupportedOnThisPlatform) {
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return Center(
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child: Padding(
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padding: EdgeInsets.all(24),
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child: Column(
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mainAxisAlignment: MainAxisAlignment.center,
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children: [
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Icon(Icons.desktop_windows, size: 80, color: Colors.grey[400]),
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SizedBox(height: 16),
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Text(
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AppLocalizations.of(context).cameraNotAvailable,
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style: TextStyle(fontSize: 18, fontWeight: FontWeight.w600, color: Colors.grey[700]),
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),
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SizedBox(height: 8),
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Text(
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AppLocalizations.of(context).cameraNotSupportedMessage,
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textAlign: TextAlign.center,
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style: TextStyle(fontSize: 14, color: Colors.grey[600]),
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),
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],
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),
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),
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);
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}
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// macOS fallback: explain file selection
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if (_useFilePickerMode) {
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return Center(
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child: Padding(
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padding: EdgeInsets.all(24),
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child: Column(
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mainAxisAlignment: MainAxisAlignment.center,
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children: [
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Icon(Icons.photo_library, size: 80, color: Colors.grey[400]),
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SizedBox(height: 16),
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Text(
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AppLocalizations.of(context).addPhotos,
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style: TextStyle(fontSize: 18, fontWeight: FontWeight.w600, color: Colors.grey[700]),
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),
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SizedBox(height: 8),
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Text(
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AppLocalizations.of(context).addPhotosInstruction,
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textAlign: TextAlign.center,
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style: TextStyle(fontSize: 14, color: Colors.grey[600]),
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),
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],
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),
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),
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);
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}
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// Show camera preview if available on any platform
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if (_isCameraInitialized && _cameraController != null) {
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return Container(
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margin: EdgeInsets.all(16),
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decoration: BoxDecoration(
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borderRadius: BorderRadius.circular(12),
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boxShadow: [
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BoxShadow(
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color: Colors.grey.withValues(alpha: 0.3),
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spreadRadius: 2,
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blurRadius: 8,
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offset: Offset(0, 4),
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),
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],
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),
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child: ClipRRect(
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borderRadius: BorderRadius.circular(12),
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child: CameraPreview(_cameraController!),
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),
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);
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}
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// When camera is not available, show empty state
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return Center(
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child: Column(
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mainAxisAlignment: MainAxisAlignment.center,
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children: [
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Icon(
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Icons.camera_alt,
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size: 80,
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color: Colors.grey[400],
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),
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SizedBox(height: 16),
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Text(
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AppLocalizations.of(context).cameraInitializing,
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style: TextStyle(
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fontSize: 18,
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color: Colors.grey[600],
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fontWeight: FontWeight.w500,
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),
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),
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SizedBox(height: 8),
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Text(
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AppLocalizations.of(context).cameraLoadingMessage,
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style: TextStyle(
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fontSize: 14,
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color: Colors.grey[500],
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),
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textAlign: TextAlign.center,
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),
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],
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),
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);
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}
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Widget _buildPhotoGallery() {
|
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return Column(
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children: [
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// Photo counter (if more than one photo)
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if (_capturedPhotos.length > 1)
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Container(
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|
padding: EdgeInsets.symmetric(vertical: 8),
|
|
child: Text(
|
|
'${_currentPhotoIndex + 1} ${AppLocalizations.of(context).photoOf} ${_capturedPhotos.length}',
|
|
style: TextStyle(
|
|
fontSize: 16,
|
|
fontWeight: FontWeight.w500,
|
|
color: Colors.grey[700],
|
|
),
|
|
),
|
|
),
|
|
|
|
// Photo viewer with swipe gestures and navigation arrows
|
|
Expanded(
|
|
child: Stack(
|
|
children: [
|
|
PageView.builder(
|
|
controller: _pageController,
|
|
onPageChanged: (index) {
|
|
setState(() {
|
|
_currentPhotoIndex = index;
|
|
});
|
|
},
|
|
itemCount: _capturedPhotos.length,
|
|
itemBuilder: (context, index) {
|
|
return Container(
|
|
margin: EdgeInsets.all(16),
|
|
decoration: BoxDecoration(
|
|
borderRadius: BorderRadius.circular(12),
|
|
boxShadow: [
|
|
BoxShadow(
|
|
color: Colors.grey.withValues(alpha: 0.3),
|
|
spreadRadius: 2,
|
|
blurRadius: 8,
|
|
offset: Offset(0, 4),
|
|
),
|
|
],
|
|
),
|
|
child: ClipRRect(
|
|
borderRadius: BorderRadius.circular(12),
|
|
child: Image.memory(
|
|
_capturedPhotos[index],
|
|
fit: BoxFit.contain,
|
|
errorBuilder: (context, error, stackTrace) {
|
|
return Container(
|
|
color: Colors.grey[300],
|
|
child: Center(
|
|
child: Column(
|
|
mainAxisAlignment: MainAxisAlignment.center,
|
|
children: [
|
|
Icon(Icons.error, size: 50, color: Colors.grey[600]),
|
|
SizedBox(height: 8),
|
|
Text(AppLocalizations.of(context).photoError),
|
|
],
|
|
),
|
|
),
|
|
);
|
|
},
|
|
),
|
|
),
|
|
);
|
|
},
|
|
),
|
|
if (_capturedPhotos.length > 1 && _isDesktopPlatform)
|
|
Positioned(
|
|
left: 8,
|
|
top: 0,
|
|
bottom: 0,
|
|
child: Center(
|
|
child: IconButton(
|
|
onPressed: _currentPhotoIndex > 0
|
|
? _goToPreviousPhoto
|
|
: null,
|
|
icon: Icon(Icons.chevron_left, size: 36),
|
|
style: IconButton.styleFrom(
|
|
backgroundColor: Colors.white.withValues(alpha: 0.7),
|
|
),
|
|
),
|
|
),
|
|
),
|
|
if (_capturedPhotos.length > 1 && _isDesktopPlatform)
|
|
Positioned(
|
|
right: 8,
|
|
top: 0,
|
|
bottom: 0,
|
|
child: Center(
|
|
child: IconButton(
|
|
onPressed: _currentPhotoIndex < _capturedPhotos.length - 1
|
|
? _goToNextPhoto
|
|
: null,
|
|
icon: Icon(Icons.chevron_right, size: 36),
|
|
style: IconButton.styleFrom(
|
|
backgroundColor: Colors.white.withValues(alpha: 0.7),
|
|
),
|
|
),
|
|
),
|
|
),
|
|
],
|
|
),
|
|
),
|
|
|
|
// Photo indicators (if more than one photo)
|
|
if (_capturedPhotos.length > 1)
|
|
Container(
|
|
padding: EdgeInsets.symmetric(vertical: 16),
|
|
child: Row(
|
|
mainAxisAlignment: MainAxisAlignment.center,
|
|
children: _capturedPhotos.asMap().entries.map((entry) {
|
|
return Container(
|
|
width: 8,
|
|
height: 8,
|
|
margin: EdgeInsets.symmetric(horizontal: 4),
|
|
decoration: BoxDecoration(
|
|
shape: BoxShape.circle,
|
|
color: _currentPhotoIndex == entry.key
|
|
? Colors.blue
|
|
: Colors.grey[400],
|
|
),
|
|
);
|
|
}).toList(),
|
|
),
|
|
),
|
|
],
|
|
);
|
|
}
|
|
} |