Initial Release - Undo/Redo for ReactiveNotifier #

This is the initial release of reactive_notifier_replay, providing undo/redo functionality for ReactiveNotifier state management.

Features

• ReplayReactiveNotifier: Wrapper around ReactiveNotifier with history tracking
• ReplayViewModel: ViewModel extension with automatic state history
• ReplayAsyncViewModelImpl: AsyncViewModelImpl extension (tracks only success states)
• ReplayHistoryMixin: Shared mixin for custom implementations

Capabilities

• Undo/Redo navigation through state history
• Configurable history limit
• Debounce support for grouping rapid changes
• Availability callbacks (onCanUndoChanged, onCanRedoChanged)
• Jump to any point in history
• Peek historical states without changing current state

Integration

• Fully compatible with ReactiveNotifier 2.16.0
• Uses onStateChanged/onAsyncStateChanged hooks
• Follows ReactiveNotifier patterns and conventions

Usage Example

// Simple state with undo/redo
mixin CounterService {
  static final counter = ReplayReactiveNotifier<int>(
    create: () => 0,
    historyLimit: 50,
    onCanUndoChanged: (canUndo) => print('Can undo: $canUndo'),
    onCanRedoChanged: (canRedo) => print('Can redo: $canRedo'),
  );

  static void increment() => counter.updateState(counter.notifier + 1);
  static void undo() => counter.undo();
  static void redo() => counter.redo();
}

// Complex state with debouncing
class DocumentViewModel extends ReplayViewModel<DocumentState> {
  DocumentViewModel() : super(
    DocumentState.empty(),
    historyLimit: 100,
    debounceHistory: Duration(milliseconds: 500),
  );

  void updateContent(String content) {
    transformState((state) => state.copyWith(content: content));
  }
}

Dependencies #

• Requires reactive_notifier: ^2.16.0
• Compatible with Flutter SDK >=1.17.0