Function touchy

dragula.js:498–522

(el, op, type, fn)

}

function touchy (el, op, type, fn) {
  var touch = {
    mouseup: 'touchend',
    mousedown: 'touchstart',
    mousemove: 'touchmove'
  };
  var pointers = {
    mouseup: 'pointerup',
    mousedown: 'pointerdown',
    mousemove: 'pointermove'
  };
  var microsoft = {
    mouseup: 'MSPointerUp',
    mousedown: 'MSPointerDown',
    mousemove: 'MSPointerMove'
  };
  if (global.navigator.pointerEnabled) {
    crossvent[op](el, pointers[type], fn);
  } else if (global.navigator.msPointerEnabled) {
    crossvent[op](el, microsoft[type], fn);
  } else {
    crossvent[op](el, touch[type], fn);
    crossvent[op](el, type, fn);
  }
}

function whichMouseButton (e) {
  if (e.touches !== void 0) { return e.touches.length; }