touch-position/index.js

get current touch/mouse position

var offset = require('mouse-event-offset');
var EventEmitter = require('events').EventEmitter;

function attach (opt) {
  opt = opt || {};
  var element = opt.element || window;

  var emitter = new EventEmitter();

  var position = opt.position || [0, 0];
  if (opt.touchstart !== false) {
    element.addEventListener('mousedown', update, false);
    element.addEventListener('touchstart', updateTouch, false);
  }

  element.addEventListener('mousemove', update, false);
  element.addEventListener('touchmove', updateTouch, false);

  emitter.position = position;
  emitter.dispose = dispose;
  return emitter;

  function updateTouch (ev) {
    var touch = ev.targetTouches[0];
    update(touch);
  }

  function update (ev) {
    offset(ev, element, position);
    emitter.emit('move', ev);
  }

  function dispose () {
    element.removeEventListener('mousemove', update, false);
    element.removeEventListener('mousedown', update, false);
    element.removeEventListener('touchmove', updateTouch, false);
    element.removeEventListener('touchstart', updateTouch, false);
  }
}

module.exports = function (opt) {
  return attach(opt).position;
};

module.exports.emitter = function (opt) {
  return attach(opt);
};