/**
 * v-dialogDragWidth 可拖动弹窗高度（右下角）
 * Copyright (c) 2019 ruoyi
 */

export default {
  bind(el) {
    const dragDom = el.querySelector('.el-dialog')
    const lineEl = document.createElement('div')
    lineEl.style = 'width: 6px; background: inherit; height: 10px; position: absolute; right: 0; bottom: 0; margin: auto; z-index: 1; cursor: nwse-resize;'
    lineEl.addEventListener('mousedown',
      function(e) {
        // 鼠标按下，计算当前元素距离可视区的距离
        const disX = e.clientX - el.offsetLeft
        const disY = e.clientY - el.offsetTop
        // 当前宽度 高度
        const curWidth = dragDom.offsetWidth
        const curHeight = dragDom.offsetHeight
        document.onmousemove = function(e) {
          e.preventDefault() // 移动时禁用默认事件
          // 通过事件委托，计算移动的距离
          const xl = e.clientX - disX
          const yl = e.clientY - disY
          dragDom.style.width = `${curWidth + xl}px`
          dragDom.style.height = `${curHeight + yl}px`
        }
        document.onmouseup = function(e) {
          document.onmousemove = null
          document.onmouseup = null
        }
      }, false)
    dragDom.appendChild(lineEl)
  }
}
