93 lines
2.7 KiB
Dart
93 lines
2.7 KiB
Dart
import 'dart:async';
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import 'package:flutter/material.dart';
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import '../utils/deletion_notifier.dart';
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/// Mixin for screens that need to react to deletion events.
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///
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/// Provides automatic subscription management and filtering based on
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/// which items the screen cares about.
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///
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/// Example usage:
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/// ```dart
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/// class _MyScreenState extends State<MyScreen> with DeletionAware {
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/// List<PlexMetadata> _items = [];
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///
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/// @override
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/// Set<String>? get deletionRatingKeys =>
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/// _items.map((e) => e.ratingKey).toSet();
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///
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/// @override
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/// void onDeletionEvent(DeletionEvent event) {
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/// setState(() {
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/// _items.removeWhere((e) => e.ratingKey == event.ratingKey);
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/// });
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/// }
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/// }
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/// ```
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mixin DeletionAware<T extends StatefulWidget> on State<T> {
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StreamSubscription<DeletionEvent>? _deletionSubscription;
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/// Override to scope events to a specific server.
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///
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/// Return null to receive events from all servers.
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String? get deletionServerId => null;
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/// Override to specify which global keys this screen cares about.
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///
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/// Use format `serverId:ratingKey`.
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/// Return null to fall back to [deletionRatingKeys] matching.
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Set<String>? get deletionGlobalKeys => null;
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/// Override to specify which ratingKeys this screen cares about.
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///
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/// Return null to receive ALL events (not recommended for performance).
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/// Return an empty set to receive no events.
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///
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/// The set should include:
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/// - Direct items displayed (e.g., episode ratingKeys in a season view)
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/// - Parent items that affect display (e.g., show ratingKey for seasons)
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Set<String>? get deletionRatingKeys;
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/// Called when a relevant deletion event occurs.
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///
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/// Only called if [deletionRatingKeys] is null or contains an affected key.
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void onDeletionEvent(DeletionEvent event);
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@override
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void initState() {
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super.initState();
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_subscribeToDeletions();
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}
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void _subscribeToDeletions() {
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_deletionSubscription = DeletionNotifier().stream.listen((event) {
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if (!mounted) return;
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final serverId = deletionServerId;
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if (serverId != null && event.serverId != serverId) return;
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final globalKeys = deletionGlobalKeys;
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if (globalKeys != null) {
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if (event.affectsAnyGlobalKey(globalKeys)) {
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onDeletionEvent(event);
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}
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return;
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}
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final ratingKeys = deletionRatingKeys;
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// If keys is null, receive all events
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// Otherwise, filter to events that affect our keys
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if (ratingKeys == null || event.affectsAnyOf(ratingKeys)) {
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onDeletionEvent(event);
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}
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});
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}
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@override
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void dispose() {
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_deletionSubscription?.cancel();
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_deletionSubscription = null;
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super.dispose();
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}
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}
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