实现el-dialog的拖拽，全屏，缩小功能

基于el-dialog， 封装了一下。，实在懒得写，所以直接把代码 粘出来了

大概粘了一下效果。自己体会把。

组件使用

 <el-dialog
    v-dialogDrag
    ref="xhzqDialog"
    class="xhzqDialog"
    :title="title"
    :fullscreen="isfullscreen"
    :visible.sync="dialogVisible"
    :append-to-body="true"
    :close-on-click-modal="false"
    :show-close="false"
    :width="width"
    :class="isminimize? 'isminimize': ''"
    center
  >
    <div v-show="!isminimize" slot="title" class="medium">
      <div></div>
      <div class="centers"><span>{{title}}</span></div>
      <div class="icons">
        <i class="iconfont icon-minus" style="font-size: 24px" @click="minimize"></i>
        <i :class="isfullscreen? 'iconfont icon-full-screen-exit' : 'iconfont icon-full-screen' " style="font-size: 24px" @click="IsFullscreen"></i>
        <i class="iconfont icon-close" style="font-size: 24px" @click="closeDialog"></i>
      </div>
    </div>
    <div v-show="isminimize" slot="title"  class="horn">
      <div class="lefts"><span>{{title}}</span></div>
      <div class="centers"><i class="iconfont icon-full-screen" style="font-size: 24px" @click="minimize"></i></div>
      <div class="rights"><i class="iconfont icon-close" style="font-size: 24px" @click="closeDialog"></i></div>
    </div>
    <div v-show="!isminimize" class="dialogBody">
      <slot></slot>
    </div>
    <div v-show="!isminimize" v-if="isFooter" class="dialogFooter">
      <slot name="footer" solt="footer"></slot>
    </div>
  </el-dialog>

　　

数据定义

 data() {
      return {
        isfullscreen: false, // 全屏
        isminimize: false, // 最小化
        dialogVisible: false // 隐藏弹窗
      }
    },

　传递参数

    props: {
       {
        type: String,
        default: '50%'
      },
      title: {
        type: String,
        default: ''
      },
      isFooter: { // 是否显示脚部
        type: Boolean,
        default: true
      }
    },

　　组件方法

 methods: {
      // 最小化
      minimize() {
        this.isminimize = !this.isminimize
        if (this.isfullscreen) this.isfullscreen = !this.isfullscreen
      },
      // 关闭弹窗
      closeDialog() {
        this.dialogVisible = false
      },
      // 打开弹窗
      openDialog() {
        this.dialogVisible = true
      },
      // 全屏
      IsFullscreen() {
        this.isfullscreen = !this.isfullscreen
        if (this.isfullscreen) this.$emit('isfullscreen')
      }
    },

　　自定义指令

directives: {
      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)
          // const fixedX =
          // const fixedY =
          dialogHeaderEl.onmousedown = (e) => {
            // 判断当前是否为全屏状态
            const path = event.path || (event.composedPath && event.composedPath())
            const isFull = path.find(s => {
              if (s.className === undefined) {
                return false
              } else {
                return s.className.indexOf('is-fullscreen') > -1
              }
            })
            if (isFull !== undefined) {
              return
            }
            const isMinix = path.find(s => {
              if (s.className === undefined) {
                return false
              } else {
                return s.className.indexOf('isminimize') > -1
              }
            })
            if (isMinix !== undefined) {
              return
            }
            // 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', '')
              styT = +sty.top.replace('px', '')
            }

            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`
              // const dom = e.path.find(s => s.querySelector('.el-dialog')).children[0]
              //
              // if (dom.offsetTop < 0) {
              //   dragDom.style.top = `0px`
              // }
              // if (dom.offsetLeft < 0) {
              //   dragDom.style.left = `0px`
              // }

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

            document.onmouseup = function(e) {
              const dragDom = el.querySelector('.el-dialog')
              const offsetLeft = dragDom.offsetLeft
              const offsetTop = dragDom.offsetTop
              const left = Number(dragDom.style.left.replace('px', ''))
              const top = Number(dragDom.style.top.replace('px', ''))
              const windowWidth = window.innerWidth
              const windowHeight = window.innerHeight - 50
              const offsetRight = offsetLeft + dragDom.offsetWidth - windowWidth
              const offsetBottom = offsetTop + dragDom.offsetHeight - windowHeight
              if (offsetLeft < 0) {
                dragDom.style.left = (left - offsetLeft) + 'px'
              }
              if (offsetTop < 0) {
                dragDom.style.top = (top - offsetTop) + 'px'
              }
              if (offsetRight > 0) {
                dragDom.style.left = (left - offsetRight) + 'px'
              }
              if (offsetBottom > 0) {
                dragDom.style.top = (top - offsetBottom) + 'px'
              }
              document.onmousemove = null
              document.onmouseup = null
            }
          }
        }
      }
    },

　　监听 （打开关闭后 还原状态）

  watch: {
      dialogVisible(val) {
        if (val) {
          const el = this.$refs.xhzqDialog.$el.querySelector('.el-dialog')
          el.style.left = 0
          el.style.top = 0
        }
      }
    }

　　样式

<style lang="scss">
.el-dialog{
  margin-top: 10vh!important;
}
  .no_select{
    -webkit-touch-callout: none; /* iOS Safari */
    -webkit-user-select: none; /* Chrome/Safari/Opera */
    -khtml-user-select: none; /* Konqueror */
    -moz-user-select: none; /* Firefox */
    -ms-user-select: none; /* Internet Explorer/Edge */
    user-select: none; /* Non-prefixed version, currently */
  }
  .isminimize{
    left: 20px;
    bottom: 20px;
    top: auto;
    right: auto;
    overflow:hidden;
   
    .el-dialog {
      margin: 0 !important;
       240px !important;
      height: 40px;
      top: 0 !important;
      left: 0 !important;
    }
    .el-dialog__header{
      cursor: auto!important;

      .el-dialog__headerbtn {
        display: none;
      }
    }
    .dialogFooter{
      position: absolute;
      bottom: 0;

    }
  }
  .xhzqDialog {
    .is-fullscreen {
       100% !important;
      left: 0 !important;
      top: 0 !important;
      margin-top: 0 !important;
      overflow:hidden;
      position: relative;
      .el-dialog__header{
      cursor: auto!important;
      }
      .el-dialog__body{
        height: 100%;
        .dialogBody{
          height:100%!important;
          max-height:none!important;
          padding-bottom:120px!important;
        }
      }
      .dialogFooter{
        position: absolute;
        bottom: 0;
         100%;
        background: #fff;
      }
    }
    .el-dialog{
      .el-dialog__header{
         100%;
        padding: 5px 20px 5px !important;
        display: flex;
        border-bottom: 1px solid #ccc;
        @extend .no_select;
        cursor: auto;
        .medium{
           100%;
          height: 100%;
          display: flex;
          div{
            flex:1;
          }
          .centers{
            span{
              text-align: center;
              font-size:16px;
              color:#606266;
            }
          }
          .icons{
            display: flex;
            justify-content: flex-end;
            i{
              color:#5f6368;
              font-size: 18px!important;
              display: block;
              padding:0 7px;
            }
            i:hover{
              background: #dcdfe6;
              cursor: pointer;
            }
            .el-icon-close:hover{
              background: #f00;
              color:#fff;
            }
          }
        }
        .horn{
           100%;
          height: 100%;
          display: flex;
          justify-content: space-between;
          div{
            i{
              color:#5f6368;
              font-size:20px!important;
            }
          }
          .lefts{
            flex:4;
            margin-top: 3px;
            overflow: hidden;
            text-overflow:ellipsis;
            white-space: nowrap;
            span{
              font-size: 16px;
              color:#606266;
            }
          }
          .centers{
            flex:1;
          }
          .rights{
            flex:1;
          }
          i:hover{
            cursor: pointer;
            color:#000;
          }
        }
        .el-dialog__headerbtn {
          top: 0;
          font-size: 24px;
        }
      }
      .el-dialog__body{
        padding: 1px !important;
        .dialogBody{
          max-height: calc(80vh - 50px);
          box-shadow: inset 0px -2px 10px 1px #b0b3b2;
          overflow: auto;
          padding: 20px 25px 20px;
          background: #f7f9fc;
          &::-webkit-scrollbar {
             4px;
            height: 8px;
          }
          &::-webkit-scrollbar-thumb {
            background: transparent;
            border-radius: 4px;
          }
          &:hover::-webkit-scrollbar-thumb {
            background: hsla(0,0%,53%,.4)
          }
          &:hover::-webkit-scrollbar-track {
            background: hsla(0,0%,53%,.1)
          }
        }
        .dialogFooter{
          padding: 10px 15px;
          border-top: 1px solid #ccc;
          text-align: right;
          .el-button{
            padding:7px 15px;
          }
        }
      }
    }
    .xhzqDialog{
  // display: flex;
  // justify-content: center;
    .el-select{
       100%;
    }
    .el-date-editor{
       100%;
    }
  }
  }
</style>