quick dcl state machine example

gamestate.ts

export default interface IState {
  onUpdate(deltaTime: number): void;
  onEnter(param?: any): void;
  onExit(): void;
}

export namespace GameStateMachine {
  const sceneStates: { [id: string]: IState } = {};
  let myCurrentState: IState;

  export function change(stateName: string, param?: any): void {
    if (stateName in sceneStates) {
      if (myCurrentState) myCurrentState.onExit();
      myCurrentState = sceneStates[stateName];
      myCurrentState.onEnter(param);
    } else {
      console.log("state does not exist.  one of these days, handle it here.");
    }
  }

  export function add(name: string, state: IState): void {
    sceneStates[name] = state;
  }
}


{
  GameStateMachine.add(GameConfig.states.RESET, new StateReset());
  GameStateMachine.add(GameConfig.states.SPINNER, new StateSpinnerTest());
  GameStateMachine.add(GameConfig.states.SKELETON, new StateSkeleton());

  // kick it off.
  GameStateMachine.change(GameConfig.states.RESET);
}