event.js

function getEvent (e) {
  return !e ? window.event : e
}

export function rightClick (e) {
  e = getEvent(e)

  if (e.which) {
    return e.which == 3 // eslint-disable-line
  }
  if (e.button) {
    return e.button == 2 // eslint-disable-line
  }

  return false
}

export function position (e) {
  let posx, posy
  e = getEvent(e)

  if (e.touches && e.touches[0]) {
    e = e.touches[0]
  }
  else if (e.changedTouches && e.changedTouches[0]) {
    e = e.changedTouches[0]
  }

  if (e.clientX || e.clientY) {
    posx = e.clientX
    posy = e.clientY
  }
  else if (e.pageX || e.pageY) {
    posx = e.pageX - document.body.scrollLeft - document.documentElement.scrollLeft
    posy = e.pageY - document.body.scrollTop - document.documentElement.scrollTop
  }

  return {
    top: posy,
    left: posx
  }
}

export function targetElement (e) {
  let target
  e = getEvent(e)

  if (e.target) {
    target = e.target
  }
  else if (e.srcElement) {
    target = e.srcElement
  }

  // defeat Safari bug
  if (target.nodeType === 3) {
    target = target.parentNode
  }

  return target
}

export function getMouseWheelDirection (e) {
  e = getEvent(e)
  return Math.max(-1, Math.min(1, (e.wheelDelta || -e.detail)))
}