/**
 * @description: dialog 弹框
 * @author:
 */
// 自定义指令 dialog 可拖拽
function dialogDrag(Vue) {
  Vue.directive('dialogDrag', {
    bind(el, binding, vnode, oldVnode) {
      const dialogHeaderEl = el.querySelector('.el-dialog__header')
      const dragDom = el.querySelector('.el-dialog')
      dialogHeaderEl.style.cursor = 'move'

      // 获取原有属性 ie dom元素.currentStyle 火狐谷歌 window.getComputedStyle(dom元素, null);
      const sty = dragDom.currentStyle || window.getComputedStyle(dragDom, null)

      dialogHeaderEl.onmousedown = (e) => {
      // 鼠标按下，计算当前元素距离可视区的距离
        const disX = e.clientX - dialogHeaderEl.offsetLeft
        const disY = e.clientY - dialogHeaderEl.offsetTop

        // 获取到的值带px 正则匹配替换
        let styL, styT

        // 注意在ie中 第一次获取到的值为组件自带50% 移动之后赋值为px
        if (sty.left.includes('%')) {
          styL = +document.body.clientWidth * (+sty.left.replace(/\%/g, '') / 100)
          styT = +document.body.clientHeight * (+sty.top.replace(/\%/g, '') / 100)
        } else {
          styL = +sty.left.replace(/\px/g, '')
          styT = +sty.top.replace(/\px/g, '')
        }

        document.onmousemove = function(e) {
        // 通过事件委托，计算移动的距离
          const l = e.clientX - disX
          const t = e.clientY - disY

          // 移动当前元素
          dragDom.style.left = `${l + styL}px`
          dragDom.style.top = `${t + styT}px`

        // 将此时的位置传出去
        // binding.value({x:e.pageX,y:e.pageY})
        }

        document.onmouseup = function(e) {
          document.onmousemove = null
          document.onmouseup = null
        }
      }
    }
  })
}
const Dialog = {
  install: function(Vue, data) {
    dialogDrag(Vue)
  }
}

// 导出
export default Dialog
