71 lines
1.7 KiB
Dart
71 lines
1.7 KiB
Dart
import 'dart:async';
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import 'package:flutter/foundation.dart';
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import 'package:sentry_flutter/sentry_flutter.dart';
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import '../models/app_error.dart';
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import '../models/product.dart';
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import '../services/product_service.dart';
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/// The app-wide product list, kept in sync with the database. Stock changes
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/// from tabs show up here automatically.
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class InventoryViewModel extends ChangeNotifier {
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final ProductService productService;
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InventoryViewModel({required this.productService});
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StreamSubscription<List<Product>>? _subscription;
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List<Product> _products = [];
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bool _hasLoaded = false;
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AppError? _loadError;
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List<Product> get products => _products;
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bool get hasLoaded => _hasLoaded;
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bool get isLoading => !_hasLoaded;
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AppError? get loadError => _loadError;
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void ensureLoaded() {
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if (_subscription != null) return;
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_subscription = productService.watchProducts().listen(
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_onProducts,
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onError: _onLoadError,
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);
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}
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/// Starts watching again after a load error.
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void retry() {
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unawaited(_subscription?.cancel());
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_subscription = null;
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_hasLoaded = false;
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_loadError = null;
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notifyListeners();
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ensureLoaded();
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}
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void _onProducts(List<Product> products) {
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_products = products;
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_hasLoaded = true;
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_loadError = null;
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notifyListeners();
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}
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void _onLoadError(Object error, StackTrace stack) {
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debugPrint('InventoryViewModel: load error: $error');
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unawaited(Sentry.captureException(error, stackTrace: stack));
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_hasLoaded = true;
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_loadError = AppError.loadProducts;
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notifyListeners();
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}
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@override
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void dispose() {
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_subscription?.cancel();
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super.dispose();
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}
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}
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