Function inputHandler

docs/tests/v2/es6/js/sanddance.js:51850–51871

* handle input events * @param {Manager} manager * @param {String} eventType * @param {Object} input

(manager, eventType, input)

  function inputHandler(manager, eventType, input) {
    var pointersLen = input.pointers.length;
    var changedPointersLen = input.changedPointers.length;
    var isFirst = eventType & INPUT_START && pointersLen - changedPointersLen === 0;
    var isFinal = eventType & (INPUT_END | INPUT_CANCEL) && pointersLen - changedPointersLen === 0;
    input.isFirst = !!isFirst;
    input.isFinal = !!isFinal;

    if (isFirst) {
      manager.session = {};
    } // source event is the normalized value of the domEvents
    // like 'touchstart, mouseup, pointerdown'


    input.eventType = eventType; // compute scale, rotation etc

    computeInputData(manager, input); // emit secret event

    manager.emit('hammer.input', input);
    manager.recognize(input);
    manager.session.prevInput = input;
  }
  /**
   * extend the data with some usable properties like scale, rotate, velocity etc
   * @param {Object} manager