Class GameEngine

src/GameEngine.js:25–185

};

export default class GameEngine extends Component {
  constructor(props) {
    super(props);
    this.state = {
      entities: null
    };
    this.timer = props.timer || new DefaultTimer();
    this.timer.subscribe(this.updateHandler);
    this.touches = [];
    this.screen = Dimensions.get("window");
    this.previousTime = null;
    this.previousDelta = null;
    this.events = [];
    this.touchProcessor = props.touchProcessor(this.touches);
    this.layout = null;
  }

  async componentDidMount() {
    let entities = getEntitiesFromProps(this.props);

    if (isPromise(entities)) entities = await entities;

    this.setState(
      {
        entities: entities || {}
      },
      () => {
        if (this.props.running) this.start();
      }
    );
  }

  componentWillUnmount() {
    this.stop();
    this.timer.unsubscribe(this.updateHandler);
    if (this.touchProcessor.end) this.touchProcessor.end();
  }

  UNSAFE_componentWillReceiveProps(nextProps) {
    if (nextProps.running !== this.props.running) {
      if (nextProps.running) this.start();
      else this.stop();
    }
  }

  clear = () => {
    this.touches.length = 0;
    this.events.length = 0;
    this.previousTime = null;
    this.previousDelta = null;
  };

  start = () => {
    this.clear();
    this.timer.start();
    this.dispatch({ type: "started" });
  };