65 lines
2.1 KiB
Dart
65 lines
2.1 KiB
Dart
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import 'dart:collection';
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import 'package:flutter_riverpod/flutter_riverpod.dart';
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import 'package:sharedinbox/core/models/undo_action.dart';
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import 'package:sharedinbox/di.dart';
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class UndoService extends StateNotifier<UndoAction?> {
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UndoService(this._ref) : super(null);
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final Ref _ref;
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final ListQueue<UndoAction> _history = ListQueue<UndoAction>();
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static const int _maxHistory = 10;
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void pushAction(UndoAction action) {
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_history.addLast(action);
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if (_history.length > _maxHistory) {
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_history.removeFirst();
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}
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state = action;
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}
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void clear() {
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_history.clear();
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state = null;
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}
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Future<void> undo() async {
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if (_history.isEmpty) return;
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final action = _history.removeLast();
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// Update state to the new last action or null
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state = _history.isNotEmpty ? _history.last : null;
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final repo = _ref.read(emailRepositoryProvider);
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for (final id in action.emailIds) {
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// Optimization: if the original change is still in the queue and hasn't
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// been attempted yet, we can just remove it from the queue.
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// Whether it was a move or a delete, the local state change needs
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// to be reversed.
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final cancelled = await repo.cancelPendingChange(
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id,
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action.type == UndoType.delete ? 'delete' : 'move',
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);
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// Whether cancelled or not, we move the email back to its source
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// to restore the local DB state and (if not cancelled) enqueue
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// the reverse change on the server.
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try {
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await repo.moveEmail(id, action.sourceMailboxPath);
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if (cancelled) {
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// If we cancelled the original change, and then moved it back,
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// we've just enqueued a NEW 'move' change that is redundant
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// (because the server never saw the first one).
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// So we should cancel this one too!
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await repo.cancelPendingChange(id, 'move');
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}
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} catch (e) {
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// If the row is gone (hard delete), we can't undo it locally.
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// TODO: Could consider re-fetching if it was a JMAP delete that
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// hasn't synced yet, but that's complex.
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}
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}
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}
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}
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