vue 水波纹指令

ripple.js

export default {
  inserted (el, binding, vnode) {
    vnode.context.$nextTick(() => {
      let ripple = new Ripple({ el, binding })
      ripple.addEvent()
    })
  },
  update (el, binding, vnode) {
    vnode.context.$nextTick(() => {
      let ripple = new Ripple({ el, binding })
      ripple.addEvent()
    })
  }
}

let ripple
function Ripple (option) {
  if (!ripple) {
    ripple = new Factory(option)
  } else {
    ripple.refresh(option)
  }
  return ripple
}

class Factory {
  constructor (option) {
    this.el = option.el
    this.binding = option.binding
  }
  refresh (option) {
    this.el = option.el
    this.binding = option.binding
  }
  addEvent () {
    this.el.style.position = 'relative'
    this.el.style.overflow = 'hidden'
    this.el.addEventListener('click', this.addRippleEffect)
  }
  addRippleEffect (e) {
    var target = e.target
    var rect = target.getBoundingClientRect()
    var ripple = target.querySelector('.ripple')
    if (!ripple) {
      ripple = document.createElement('span')
      ripple.className = 'ripple'
      ripple.style.height = ripple.style.width = Math.max(rect.width, rect.height) + 'px'
      target.appendChild(ripple)
    }
    ripple.classList.remove('show')
    var top = e.pageY - rect.top - ripple.offsetHeight / 2 - document.body.scrollTop
    var left = e.pageX - rect.left - ripple.offsetWidth / 2 - document.body.scrollLeft
    ripple.style.top = top + 'px'
    ripple.style.left = left + 'px'
    ripple.classList.add('show')
  }
}