@pietal.dev/engine/dist/state-machine.js

PIXI v8, v7, v6 compatible: inspired by Unity, reactive Game Framework: GameObject, StateMachine, CircleBody, PolygonBody, Physics, Sprite, Container, Animator, TextureAtlas, Resources loading

'use strict';
Object.defineProperty(exports, '__esModule', { value: true });
exports.StateMachine = void 0;
const Subject_1 = require('rxjs/internal/Subject');
const component_1 = require('./component');
class StateMachine extends component_1.Component {
  constructor(gameObject, initialState = '') {
    super(gameObject);
    /**
     * Before his state changes, it emits this subject.
     */
    this.change$ = new Subject_1.Subject();
    /**
     * After his state changes, it emits this subject.
     */
    this.state$ = new Subject_1.Subject();
    /**
     * Each Lifecycle Object has label for pixi debugging.
     */
    this.label = 'StateMachine';
    /**
     * Current state of the State Machine.
     */
    this.state = '';
    /**
     * Validators for state changes.
     */
    this.validators = {};
    if (initialState) {
      this.state = initialState;
    }
  }
  setState(newState) {
    if (!this.validateStateChange(newState)) {
      return false;
    }
    this.change$.next([this.state, newState]);
    this.state = newState;
    this.state$.next(this.state);
    return true;
  }
  setValidators(fromState, validators) {
    this.validators[fromState] = validators;
  }
  getValidators(fromState) {
    return this.validators[fromState] || [];
  }
  destroy() {
    this.state$.complete();
    this.change$.complete();
    super.destroy();
  }
  validateStateChange(newState) {
    const fromAllStates = this.getValidators('*');
    const fromCurrentState = this.getValidators(this.state);
    const isValid = [...fromAllStates, ...fromCurrentState].every((validator) =>
      validator(newState)
    );
    return isValid;
  }
}
exports.StateMachine = StateMachine;