import Vue from 'vue'

const drag = Vue.directive('drag', {
  bind (el, binding, vnode, oldVnode) {
    const dialogHeaderEl = el.querySelector('.public-bounced-title')
    dialogHeaderEl.onmousedown = function (e) {
      var distX = e.pageX - el.offsetLeft
      var distY = e.pageY - el.offsetTop
      if (e.preventDefault) {
        e.preventDefault()
      } else {
        e.returnValue = false
      }
      document.onmousemove = function (e) {
        let left = e.clientX - distX
        let top = e.clientY - distY

        if (left <= 0) {
          left = 5
        } else if (left > document.documentElement.clientWidth - dialogHeaderEl.clientWidth) {
          left = document.documentElement.clientWidth - dialogHeaderEl.clientWidth - 5
        }
        if (top <= 0) {
          top = 5
        } else if (top > document.documentElement.clientHeight - dialogHeaderEl.clientHeight) {
          top = document.documentElement.clientHeight - dialogHeaderEl.clientHeight - 5
        }

        el.style.left = left + 'px'
        el.style.top = top + 'px'
      }
      document.onmouseup = function () {
        document.onmousemove = document.onmouseup = null
      }
    }
  }
})
export default drag