<div class="component-box" ref="compBox">
 <component
   v-for="(item, index) in comRoute"
   :is="item"
   :key="index"
   @getData="getData">
</component>
 <div :class="['translate-box', {'move-icon':transType}]"
    ref="translateBox" v-if="transType">
  <component :is="transCom"></component>
 </div>
</div>

comList: ['educationExp', 'workExp', 'projectExp'], // 模块列表
comLen: 0, // 模块的长度
comType: '', // 当前移动的模块
transType: '', // 当前移动的模块
coordinate: { // 鼠标坐标
 mouseX: 0,
 mouseY: 0,
},
downFlag: false, // 当前是否点击模块移动
mouseYBefore: 0, // 记录鼠标点击时Y坐标以及鼠标每移动30后重新记录鼠标Y坐标
mouseYLast: 0, // 实时记录鼠标移动时的Y坐标
nowCom: '', // 移动模块时，上一个模块或者下一个模块的名称
forFlage: false, // forEach遍历结束的标识
comRoute: [], // 动态加载组件列表
transCom: null, // 点击后悬浮的组件
compBox: null, // 获取当前组件在页面中的位置信息

props: { scrollTop: Number,}

watch: {
 comList: { 
  handler(val) {
   this.getCom(val); // 模块列表改变时，实时加载组件
  },
  deep: true,
  immediate: true, // 声明了之后会立马执行handler里面的函数
 },
 transType(val) { // 悬浮模块加载组件
  if (val) {
   this.transCom = () => import(`./default/${val}`);
  }
 },
 scrollTop: { // 监听页面滚动
  handler() {},
  immediate: true,
 },
 comType(newVal) {
  if (newVal) {
   this.comList.forEach((item, index) => {
    if (item === newVal) {
     this.comList[index] = 'moveBox'; // 将组建列表中为comType的元素改为moveBox组件
    }
   });
   this.getCom(this.comList);
  }
 },
 downFlag(newVal) { // 鼠标已经点击
  const nowThis = this;
  document.onmousemove = function (e) {
   if (newVal) { // 鼠标移动赋值
    nowThis.coordinate.mouseX = e.clientX;
    nowThis.coordinate.mouseY = e.clientY;
   }
  };
  document.onmouseup = function () { // 鼠标松开
   document.onmousemove = null;
   if (newVal) {
    nowThis.transType = ''; // 悬浮组件置空
    nowThis.comList.forEach((item, index) => {
     if (item === 'moveBox') { // 寻找moveBox所在位置
      nowThis.comList[index] = nowThis.comType; // 还原成点击组件
     }
    });
    nowThis.downFlag = false;
    nowThis.comType = '';
    nowThis.getCom(nowThis.comList);
   }
  };
 },
 coordinate: {
  handler(newVal) { // 悬浮组件位置
   this.$refs.translateBox.style.top = `${newVal.mouseY + this.scrollTop - 40 - this.compBox.y}px`;
   this.$refs.translateBox.style.left = `${newVal.mouseX - this.compBox.x - 200}px`;
   this.mouseYLast = newVal.mouseY;
  },
  deep: true,
 },
 mouseYLast(newVal) { // 鼠标移动Y坐标
  this.forFlage = false; 
  if (newVal - this.mouseYBefore > 30) {  // 移动30鼠标向下移，每移动30，moveBox移动一次
   this.comList.forEach((item, index) => {
    if (item === 'moveBox' && index < this.comLen - 1 && !this.forFlage) {
     this.nowCom = this.comList[index + 1];
     this.$set(this.comList, index + 1, 'moveBox');
     this.$set(this.comList, index, this.nowCom);
     this.mouseYBefore = newVal;
     this.forFlage = true;
    }
   });
  } else if (newVal - this.mouseYBefore < -30) {   // 鼠标向上移
   this.comList.forEach((item, index) => {
    if (item === 'moveBox' && index > 0 && !this.forFlage) {
     this.nowCom = this.comList[index - 1];
     // this.comList[index - 1] = 'moveBox';
     // this.comList[index] = this.nowCom;
     // this.comList[index]数组中采用这种方式赋值，vue是不能检测到数组的变动的
     this.$set(this.comList, index - 1, 'moveBox');
     this.$set(this.comList, index, this.nowCom);
     this.mouseYBefore = newVal;
     this.forFlage = true;
    }
   });
  }
 },
},

methods: {
 getCom(val) {
  this.comRoute = [];
  val.forEach((item) => {
   this.comRoute.push(() => import(`./default/${item}`));
  });
 },
 getData(data, dataY, dataX) { // 模块组件点击后，父组件中调用此方法，并传值过来
  this.comType = data;
  this.transType = data;  // 目前考虑点击后立即移动，点击不移动的情况后期再考虑
  this.downFlag = true;
  this.mouseYBefore = dataY;
  this.$nextTick(() => {
   this.$refs.translateBox.style.top = `${dataY + this.scrollTop - 40 - this.compBox.y}px`;
   this.$refs.translateBox.style.left = `${dataX - this.compBox.x - 200}px`;
  });
 },
},

mounted() {
 this.comLen = this.comList.length;
 this.compBox = this.$refs.compBox.getBoundingClientRect();
 const that = this;
 window.onresize = () => (() => {
  that.compBox = this.$refs.compBox.getBoundingClientRect();
 })();
},

<div class="pad-box hover-box name-box">
 <p class="absolute-box">
  <i class="el-icon-rank operation-icon move-icon"    @mousedown="mouseDown"></i>
  <i class="el-icon-circle-plus operation-icon"></i>
  <i class="el-icon-s-tools operation-icon"></i>
 </p>
 教育经验
</div>

export default {
 name: 'educationExp',
 data() {
  return {
   comType: 'educationExp',
   mouseYBefore: 0,
   mouseXBefore: 0,
  };
 },
 methods: {
  mouseDown(e) {
   this.mouseYBefore = e.clientY;
   this.mouseXBefore = e.clientX;
   this.$emit('getData', this.comType, this.mouseYBefore, this.mouseXBefore);
  },
 },
};