TagsView.vue

1.TagsView.vue

<template>
     <div class="tags-view-container">
          <scroll-pane class="tags-view-wrapper" ref="scrollPane">
              <router-link ref="tag"  class="isActive(tag)?'active':''"  :to="tag"  @contextmenu.prevent.native="openMenu(tag,$event)" v-for="tag in Array.from(visitedViews)" :key="tag.path" >
                {{tag.title}}
                  <span class="el-icon-close" @click.prevent.stop='closeSelectedTag(tag)'></span>
              </router-link>
          </scroll-pane>
       <ul class='contextmenu' v-show="visible" :style="{left:left+'px',top:top+'px'}">
         <li @click="closeSelectedTag(selectedTag)">关闭</li>
         <li @click="closeOthersTags">关闭其他</li>
         <li @click="closeAllTags">关闭所有</li>
       </ul>
     </div>
</template>

<script>
  import ScrollPane from '@/components/ScrollPane'
    export default {
        name: "tags-view",
      components: { ScrollPane },
     data(){
          return{
            visible: false,
            top: 0,
            left: 0,
            selectedTag: {}
          }
     },
      computed:{
          visitedViews(){
            console.log('tabView')
            console.log(this.$store.state.tagsView)
            console.log(this.$store.state)
            return this.$store.state.tagsView.visitedViews
          }
      },
      watch:{
         $route(){
           this.addViewTags()
           this.moveToCurrentTag()
         },
        visible(value) {
          if (value) {
            document.body.addEventListener('click', this.closeMenu)
          } else {
            document.body.removeEventListener('click', this.closeMenu)
          }
        }
      },
      mounted() {
        this.addViewTags()
      },
      methods:{
          generateRoute(){
            if (this.$route.name) {
              return this.$route
            }
            return false
          },
        isActive(route) {
          return route.path === this.$route.path
        },
        addViewTags() {
          const route = this.generateRoute()
          if (!route) {
            return false
          }
          this.$store.dispatch('addVisitedViews', route)
        },
        moveToCurrentTag() {
          const tags = this.$refs.tag
          this.$nextTick(() => {
            for (const tag of tags) {
              if (tag.to.path === this.$route.path) {
                this.$refs.scrollPane.moveToTarget(tag.$el)
                break
              }
            }
          })
        },
        closeSelectedTag(view) {
          this.$store.dispatch('delVisitedViews', view).then((views) => {
            if (this.isActive(view)) {
              const latestView = views.slice(-1)[0]
              if (latestView) {
                this.$router.push(latestView)
              } else {
                this.$router.push('/')
              }
            }
          })
        },
        closeOthersTags() {
          this.$router.push(this.selectedTag)
          this.$store.dispatch('delOthersViews', this.selectedTag).then(() => {
            this.moveToCurrentTag()
          })
        },
        closeAllTags() {
          this.$store.dispatch('delAllViews')
          this.$router.push('/')
        },
        openMenu(tag, e) {
          this.visible = true
          this.selectedTag = tag
          const offsetLeft = this.$el.getBoundingClientRect().left // container margin left
          this.left = e.clientX - offsetLeft + 15 // 15: margin right
          this.top = e.clientY
        },
        closeMenu() {
          this.visible = false
        }
      }
    }
</script>

<style rel="stylesheet/scss" lang="scss" scoped>
  .tags-view-container {
    .tags-view-wrapper {
      background: #fff;
      height: 34px;
      border-bottom: 1px solid #d8dce5;
      box-shadow: 0 1px 3px 0 rgba(0, 0, 0, .12), 0 0 3px 0 rgba(0, 0, 0, .04);
      .tags-view-item {
        display: inline-block;
        position: relative;
        height: 26px;
        line-height: 26px;
        border: 1px solid #d8dce5;
        color: #495060;
        background: #fff;
        padding: 0 8px;
        font-size: 12px;
        margin-left: 5px;
        margin-top: 4px;
        &:first-of-type {
          margin-left: 15px;
        }
        &.active {
          background-color: #42b983;
          color: #fff;
          border-color: #42b983;
          &::before {
            content: '';
            background: #fff;
            display: inline-block;
             8px;
            height: 8px;
            border-radius: 50%;
            position: relative;
            margin-right: 2px;
          }
        }
      }
    }
    .contextmenu {
      margin: 0;
      background: #fff;
      z-index: 100;
      position: absolute;
      list-style-type: none;
      padding: 5px 0;
      border-radius: 4px;
      font-size: 12px;
      font-weight: 400;
      color: #333;
      box-shadow: 2px 2px 3px 0 rgba(0, 0, 0, .3);
      li {
        margin: 0;
        padding: 7px 16px;
        cursor: pointer;
        &:hover {
          background: #eee;
        }
      }
    }
  }
</style>

<style rel="stylesheet/scss" lang="scss">
  //reset element css of el-icon-close
  .tags-view-wrapper {
    .tags-view-item {
      .el-icon-close {
         16px;
        height: 16px;
        vertical-align: 2px;
        border-radius: 50%;
        text-align: center;
        transition: all .3s cubic-bezier(.645, .045, .355, 1);
        transform-origin: 100% 50%;
        &:before {
          transform: scale(.6);
          display: inline-block;
          vertical-align: -3px;
        }
        &:hover {
          background-color: #b4bccc;
          color: #fff;
        }
      }
    }
  }
</style>

2.ScrollPane.vue:是当tagView内容超出一行时候的滚动（将鼠标悬浮在那一行上，不出现滚动条，该行就可以滚动）

<template>
  <div class="scroll-container" ref="scrollContainer" @wheel.prevent="handleScroll">
    <div class="scroll-wrapper" ref="scrollWrapper" :style="{left: left + 'px'}">
      <slot></slot>
    </div>
  </div>
</template>

<script>
  const padding = 15 // tag's padding

  export default {
    name: 'scrollPane',
    data() {
      return {
        left: 0
      }
    },
    methods: {
      handleScroll(e) {
        const eventDelta = e.wheelDelta || -e.deltaY * 3//wheelDelta:-120;deltaY:-120
        const $container = this.$refs.scrollContainer//外面的container
        const $containerWidth = $container.offsetWidth//外面的container的宽度
        const $wrapper = this.$refs.scrollWrapper//里面
        const $wrapperWidth = $wrapper.offsetWidth//里面的宽度

        if (eventDelta > 0) {
          this.left = Math.min(0, this.left + eventDelta)//min() 方法可返回指定的数字中带有最低值的数字。
        } else {
          if ($containerWidth - padding < $wrapperWidth) {
            if (this.left < -($wrapperWidth - $containerWidth + padding)) {
              this.left = this.left
            } else {
              this.left = Math.max(this.left + eventDelta, $containerWidth - $wrapperWidth - padding)
            }
          } else {
            this.left = 0
          }
        }
      },
      moveToTarget($target) {
        const $container = this.$refs.scrollContainer
        const $containerWidth = $container.offsetWidth
        const $targetLeft = $target.offsetLeft
        const $targetWidth = $target.offsetWidth

        if ($targetLeft < -this.left) {
          // tag in the left
          this.left = -$targetLeft + padding
        } else if ($targetLeft + padding > -this.left && $targetLeft + $targetWidth < -this.left + $containerWidth - padding) {
          // tag in the current view
          // eslint-disable-line
        } else {
          // tag in the right
          this.left = -($targetLeft - ($containerWidth - $targetWidth) + padding)
        }
      }
    }
  }
</script>

<style rel="stylesheet/scss" lang="scss" scoped>
  .scroll-container {
    white-space: nowrap;
    position: relative;
    overflow: hidden;
     100%;
    .scroll-wrapper {
      position: absolute;
    }
  }
</style>

3.Store/tagsView.js

const tagsView = {
  state: {
    visitedViews: [],
    cachedViews: []
  },
  mutations: {
    ADD_VISITED_VIEWS: (state, view) => {
      if (state.visitedViews.some(v => v.path === view.path)) return
      state.visitedViews.push(Object.assign({}, view, {
        title: view.meta.title || 'no-name'
      }))
      if (!view.meta.noCache) {
        state.cachedViews.push(view.name)
      }
    },
    DEL_VISITED_VIEWS: (state, view) => {
      for (const [i, v] of state.visitedViews.entries()) {
        if (v.path === view.path) {
          state.visitedViews.splice(i, 1)
          break
        }
      }
      for (const i of state.cachedViews) {
        if (i === view.name) {
          const index = state.cachedViews.indexOf(i)
          state.cachedViews.splice(index, 1)
          break
        }
      }
    },
    DEL_OTHERS_VIEWS: (state, view) => {
      for (const [i, v] of state.visitedViews.entries()) {
        if (v.path === view.path) {
          state.visitedViews = state.visitedViews.slice(i, i + 1)
          break
        }
      }
      for (const i of state.cachedViews) {
        if (i === view.name) {
          const index = state.cachedViews.indexOf(i)
          state.cachedViews = state.cachedViews.slice(index, i + 1)
          break
        }
      }
    },
    DEL_ALL_VIEWS: (state) => {
      state.visitedViews = []
      state.cachedViews = []
    }
  },
  actions: {
    addVisitedViews({ commit }, view) {
      commit('ADD_VISITED_VIEWS', view)
    },
    delVisitedViews({ commit, state }, view) {
      return new Promise((resolve) => {
        commit('DEL_VISITED_VIEWS', view)
        resolve([...state.visitedViews])
      })
    },
    delOthersViews({ commit, state }, view) {
      return new Promise((resolve) => {
        commit('DEL_OTHERS_VIEWS', view)
        resolve([...state.visitedViews])
      })
    },
    delAllViews({ commit, state }) {
      return new Promise((resolve) => {
        commit('DEL_ALL_VIEWS')
        resolve([...state.visitedViews])
      })
    }
  }
}

export default tagsView

4.将tagsView.js引入到store/index.js中

import Vue from 'vue'
import Vuex from 'vuex'
import user from './modules/user'
import app from './modules/app'
import permission from './modules/permission'
import tagsView from './modules/tagsView'

import getters from './getters'

Vue.use(Vuex)
const store= new Vuex.Store({
  modules:{
    user,
    app,
    permission,
    tagsView

  },
  getters

})

export default store

 总体功能分析：

1.选择左侧菜单的时候，通过监听路由变化，将左侧菜单的选中项缓存到store中，并显示在tagsView中

2.有右侧菜单事件：textmenu

3.点击名字时候，跳转到相应页面

4.点击关闭时候，关闭当前选项卡