tetrisson/controller.js at main · omerr420/tetrisson · GitHub

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function Controller(game, callbacks) {
    this.game = game;
    this.callbacks = callbacks || {};
    var self = this;

    var DAS_DELAY = 170;
    var DAS_INTERVAL = 50;
    var dasTimer = null;
    var dasInterval = null;
    var dasKey = null;

    function clearDAS() {
      clearTimeout(dasTimer);
      clearInterval(dasInterval);
      dasTimer = null;
      dasInterval = null;
      dasKey = null;
    }

    function startDAS(key, action) {
      clearDAS();
      dasKey = key;
      dasTimer = setTimeout(function() {
        dasInterval = setInterval(function() {
          if (!self.game.isPaused && !self.game.gameOver) action();
        }, DAS_INTERVAL);
      }, DAS_DELAY);
    }

    this._handler = function(e) {
      if (self.game.gameOver) return;
        if (e.code === 'Escape' || e.code === 'F1') {
        e.preventDefault();
        if (self.callbacks.onPause) self.callbacks.onPause();
        return;
      }

      if (self.game.isPaused) return;

      switch (e.code) {
        case 'ArrowLeft':
        case 'Numpad4':
          e.preventDefault();
          if (self.callbacks.onLeft) self.callbacks.onLeft();
          startDAS(e.code, self.callbacks.onLeft);
          break;
        case 'ArrowRight':
        case 'Numpad6':
          e.preventDefault();
          if (self.callbacks.onRight) self.callbacks.onRight();
          startDAS(e.code, self.callbacks.onRight);
          break;
        case 'ArrowDown':
        case 'Numpad2':
          e.preventDefault();
          if (self.callbacks.onDown) self.callbacks.onDown();
          startDAS(e.code, self.callbacks.onDown);
          break;
        case 'ArrowUp':
        case 'KeyX':
        case 'Numpad1':
        case 'Numpad5':
        case 'Numpad9':
          e.preventDefault();
          if (self.callbacks.onRotateCW) self.callbacks.onRotateCW();
          break;
        case 'KeyZ':
        case 'ControlLeft':
        case 'ControlRight':
        case 'Numpad3':
        case 'Numpad7':
          e.preventDefault();
          if (self.callbacks.onRotateCCW) self.callbacks.onRotateCCW();
          break;
        case 'Space':
        case 'Numpad8':
          e.preventDefault();
          if (self.callbacks.onHardDrop) self.callbacks.onHardDrop();
          break;
        case 'ShiftLeft':
        case 'ShiftRight':
        case 'KeyC':
        case 'Numpad0':
          e.preventDefault();
          if (self.callbacks.onHold) self.callbacks.onHold();
          break;
        default:
          break;
      }
    };

    this._upHandler = function(e) {
      if (e.code === dasKey) clearDAS();
    };

    window.addEventListener('keydown', this._handler);
    window.addEventListener('keyup', this._upHandler);
  }

  Controller.prototype.destroy = function() {
    if (this._handler) window.removeEventListener('keydown', this._handler);
    if (this._upHandler) window.removeEventListener('keyup', this._upHandler);
  };