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Keep the authoritative game state in a model or controller above the widgets that display it. Treat each legal move as one transition from the current state to a new state, then rebuild the board and related controls from that state. For undo and redo, use immutable snapshots for compact games or reversible move records when snapshots would be costly; Flutter’s UndoHistory<T> can handle keyboard undo for a ValueNotifier, but it does not implement game rules or move controls for you.
Where should game state live?
Put state shared by the board, score, turn indicator, and move controls in a model or controller above those widgets. Widgets should describe the current view, not serve as the authoritative record of the game. When the model changes, Flutter rebuilds the parts of the tree that depend on it. This follows Flutter’s declarative approach to UI and the distinction between application logic and widget construction in its simple app state management guide.
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For a small, self-contained screen, local widget state may be sufficient. Once multiple widgets need the same game state—or game logic needs to be testable independently of the UI—move that state into a model or controller. Flutter does not prescribe one state-management package for every game. The choice should fit the app’s structure rather than determine where game rules belong.
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How should a move update the board?
Make a move a single explicit state transition. A controller method should check legality against the current state, compute the next state, and publish the change once. An illegal move that changes nothing should not notify listeners unless the app separately changes something visible, such as an error message.
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- Validate: Check whether the proposed move is legal for the current game state.
- Compute: Produce the next state from the current state and move.
- Publish: Replace the current state and notify the UI once.
With Flutter’s ChangeNotifier pattern, the model calls notifyListeners() after a meaningful mutation. If using Provider, place listening Consumer widgets deep in the tree so a game-state change rebuilds only the UI that needs it, rather than a larger screen than necessary. Flutter’s guide describes ChangeNotifier, ChangeNotifierProvider, and Consumer as one approach, not a universal requirement: Flutter: Simple app state management.
How do undo and redo work?
Maintain a current state plus two histories: undo states and redo states. For a new legal move, save the current state to undo history, calculate the new state, and clear redo history. Undo saves the current state to redo history and restores the most recent undo state; redo does the reverse. This makes the branch rule explicit: after undoing, making a different move discards the old redo path.
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class GameController extends ChangeNotifier {
GameState _state;
final List<GameState> _undo = [];
final List<GameState> _redo = [];
final int maxHistory;
GameController(this._state, {this.maxHistory = 100}) {
if (maxHistory < 1) {
throw ArgumentError.value(maxHistory, 'maxHistory', 'Must be positive');
}
}
GameState get state => _state;
bool get canUndo => _undo.isNotEmpty;
bool get canRedo => _redo.isNotEmpty;
void play(Move move) {
if (!_state.isLegal(move)) return;
_undo.add(_state); // GameState snapshots must be immutable.
if (_undo.length > maxHistory) _undo.removeAt(0);
_state = _state.apply(move);
_redo.clear();
notifyListeners();
}
void undo() {
if (_undo.isEmpty) return;
_redo.add(_state);
_state = _undo.removeLast();
notifyListeners();
}
void redo() {
if (_redo.isEmpty) return;
_undo.add(_state);
_state = _redo.removeLast();
notifyListeners();
}
}This sketch is illustrative, not a Flutter-mandated API. It assumes GameState.apply returns a new, independent state rather than mutating a snapshot. In production, also define how reset and new-game actions affect history, whether undo is allowed after a win or loss, and whether the history bound applies to both stacks. The example’s default of 100 is not a recommended universal limit; choose a bound based on the game’s memory needs and the undo experience you want.
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For a compact board game, immutable snapshots are often the simplest representation: each history entry is a complete valid state, so restoring it does not require calculating an inverse move. Their cost grows with both the size of the state and the number of retained entries. The ministate_history package documents this trade-off for its own bounded snapshot history; it is an example, not a Flutter standard or a comparative performance study: pub.dev: ministate_history.
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A move-record approach stores actions and their inverse operations instead of duplicating a whole state. It can reduce history storage for a large state, but correct undo depends on implementing inverse logic for every relevant change. Commands or events can also make it easier to replay a game for debugging, provided the records contain enough information to reproduce each transition.
| Approach | History entry | Main advantage | Main trade-off |
|---|---|---|---|
| Immutable snapshots | A complete prior game state | Restoration is straightforward; each entry represents a valid state. | Memory use grows with state size and retained history length. |
| Reversible moves or commands | A move plus the information needed to reverse or replay it | May avoid storing a full state for every move; can support replay and debugging. | Inverse logic is more complex and can be incorrect if a transition is not fully reversed. |
For either design, decide whether history can be serialized if players should resume a game or replay it later. A move log may be suitable for replay, while persisted progress may require a serializable state, a log, or both. In-memory undo history and saved game progress are separate decisions: Flutter’s state management guidance notes that state can be lost on restart and points readers to platform restoration guidance.
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What does Flutter’s built-in UndoHistory do?
UndoHistory<T> provides undo/redo capabilities for a ValueNotifier. Flutter’s API reference says it “Listens to value and saves relevant values for undoing/redoing.” It also handles keyboard undo/redo shortcuts, calls onTriggered when a shortcut changes the state, and relies on a focus node managed by its child. See Flutter API: UndoHistory<T>.
This can suit a focused, editable value where platform keyboard shortcuts are useful. It does not know whether a chess move or board-game action is legal, does not define the game’s undo policy, and does not add tap-based undo buttons. Those remain the game controller and UI’s responsibility.
How much history should a game keep?
There is no universal undo depth. Bound history intentionally and choose the limit based on the size of each entry, the device and persistence requirements, and how much backtracking makes sense for the game. Keep only the history the experience requires; for large states, compare the cost of snapshots with the added complexity of reversible records.
Quick Recap
- Clear undo and redo history when starting a new game or resetting, unless the game explicitly supports undoing that transition.
- After undo followed by a new move, define whether the previous redo branch is discarded; clearing it is the simple, predictable option shown above.
- Decide whether winning, losing, or leaving a game changes the player’s ability to undo.
- Keep saved progress separate from transient UI details such as focus or button state.
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