![]() integration with React can be achieved manually or via the react-state-driven library.the createStateMachine factory accepts an optional parameter which allows developers to inject dependencies into guards, and action factories.compound states specify their initial control state with an initial transition to the target control state.compound states are control states that can have nested control states.control states can be nested - the machine is then called a hierarchical state machine.This example introduced new concepts and learnings: The chess.js library allows us to identify the validity of a player move and detect end game situations. As ChessBoard is a React component, we will thus use React as a UI library. We will use for the implementation the ChessBoard component from the chessboardjsx library, and the chess engine from chess.js. This event is reserved and cannot be used for other purposes. Note that the initial transition must use the exported INIT_EVENT as event. With Kingly, we will call that transition, an initial transition, and we will add it to the data structure passed to the state machine factory: ⊕ When a machine transitions to a compound state, it immediately transitions to the initial state for that compound state. In the general case, the mechanism is identical. As the latter control state is atomic, the machine remains in that initial control state and starts listening to events. As this is a compound state, the machine then immediately moves to the initial control state of that state, which is White plays. In our modelization, the machine starts in the White turn initial control state. In our modelization, the initial control state for White turn is White plays. The initial transition is recognizable by the fact that its origin control state is the init control state - singled out from the other nodes using a smaller node size, and a different color. We will say that White turn is a compound state, and in contrast, that White plays is an atomic state.Ĭompound states have an initial control state which is obtained as the target control state for the initial transition for that compound state. The White plays control state is nested within the White turn control state. what we presented in the previous example. The previously informally specified behavior can be modelized formally with the following state machine: When the game is over, as per the chess game rules, no more actions may be performed by the players.The piece is removed from its current position and moved to the target location. The player must subsequently click on a board location to indicate the target location for the piece. ![]() When a player whose turn it is to play clicks on one of his pieces, the piece is temporarily highlighted till the move is performed.white plays, then black plays repeatedly till a game end condition is reached.The board starts in the chess game initial configuration.
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