<template> 
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  <div id="tags-view-container" class="tags-view-container"> 
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    <scroll-pane ref="scrollPane" class="tags-view-wrapper" @scroll="handleScroll"> 
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      <router-link 
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        v-for="tag in visitedViews" 
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        ref="tag" 
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        :key="tag.path" 
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        :class="isActive(tag)?'active':''" 
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        :to="{ path: tag.path, query: tag.query, fullPath: tag.fullPath }" 
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        tag="span" 
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        class="tags-view-item" 
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        :style="activeStyle(tag)" 
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        @click.middle.native="!isAffix(tag)?closeSelectedTag(tag):''" 
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        @contextmenu.prevent.native="openMenu(tag,$event)" 
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      > 
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        {{ tag.title }} 
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        <span v-if="!isAffix(tag)" class="el-icon-close" @click.prevent.stop="closeSelectedTag(tag)" /> 
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      </router-link> 
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    </scroll-pane> 
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    <ul v-show="visible" :style="{left:left+'px',top:top+'px'}" class="contextmenu"> 
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      <li @click="refreshSelectedTag(selectedTag)"><i class="el-icon-refresh-right"></i> 刷新页面</li> 
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      <li v-if="!isAffix(selectedTag)" @click="closeSelectedTag(selectedTag)"><i class="el-icon-close"></i> 关闭当前</li> 
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      <li @click="closeOthersTags"><i class="el-icon-circle-close"></i> 关闭其他</li> 
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      <li v-if="!isFirstView()" @click="closeLeftTags"><i class="el-icon-back"></i> 关闭左侧</li> 
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      <li v-if="!isLastView()" @click="closeRightTags"><i class="el-icon-right"></i> 关闭右侧</li> 
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      <li @click="closeAllTags(selectedTag)"><i class="el-icon-circle-close"></i> 全部关闭</li> 
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    </ul> 
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  </div> 
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</template> 
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<script> 
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import ScrollPane from './ScrollPane' 
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import path from 'path' 
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export default { 
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  components: { ScrollPane }, 
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  data() { 
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    return { 
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      visible: false, 
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      top: 0, 
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      left: 0, 
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      selectedTag: {}, 
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      affixTags: [] 
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    } 
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  }, 
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  computed: { 
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    visitedViews() { 
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      return this.$store.state.tagsView.visitedViews 
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    }, 
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    routes() { 
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      return this.$store.state.permission.routes 
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    }, 
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    theme() { 
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      return this.$store.state.settings.theme; 
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    } 
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  }, 
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  watch: { 
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    $route() { 
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      this.addTags() 
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      this.moveToCurrentTag() 
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    }, 
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    visible(value) { 
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      if (value) { 
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        document.body.addEventListener('click', this.closeMenu) 
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      } else { 
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        document.body.removeEventListener('click', this.closeMenu) 
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      } 
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    } 
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  }, 
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  mounted() { 
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    this.initTags() 
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    this.addTags() 
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  }, 
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  methods: { 
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    isActive(route) { 
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      return route.path === this.$route.path 
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    }, 
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    activeStyle(tag) { 
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      if (!this.isActive(tag)) return {}; 
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      return { 
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        "background-color": this.theme, 
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        "border-color": this.theme 
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      }; 
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    }, 
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    isAffix(tag) { 
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      return tag.meta && tag.meta.affix 
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    }, 
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    isFirstView() { 
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      try { 
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        return this.selectedTag.fullPath === this.visitedViews[1].fullPath || this.selectedTag.fullPath === '/index' 
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      } catch (err) { 
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        return false 
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      } 
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    }, 
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    isLastView() { 
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      try { 
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        return this.selectedTag.fullPath === this.visitedViews[this.visitedViews.length - 1].fullPath 
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      } catch (err) { 
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        return false 
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      } 
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    }, 
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    filterAffixTags(routes, basePath = '/') { 
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      let tags = [] 
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      routes.forEach(route => { 
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        if (route.meta && route.meta.affix) { 
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          const tagPath = path.resolve(basePath, route.path) 
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          tags.push({ 
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            fullPath: tagPath, 
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            path: tagPath, 
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            name: route.name, 
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            meta: { ...route.meta } 
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          }) 
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        } 
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        if (route.children) { 
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          const tempTags = this.filterAffixTags(route.children, route.path) 
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          if (tempTags.length >= 1) { 
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            tags = [...tags, ...tempTags] 
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          } 
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        } 
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      }) 
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      return tags 
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    }, 
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    initTags() { 
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      const affixTags = this.affixTags = this.filterAffixTags(this.routes) 
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      for (const tag of affixTags) { 
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        // Must have tag name 
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        if (tag.name) { 
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          this.$store.dispatch('tagsView/addVisitedView', tag) 
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        } 
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      } 
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    }, 
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    addTags() { 
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      const { name } = this.$route 
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      if (name) { 
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        this.$store.dispatch('tagsView/addView', this.$route) 
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        if (this.$route.meta.link) { 
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          this.$store.dispatch('tagsView/addIframeView', this.$route) 
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        } 
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      } 
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      return false 
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    }, 
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    moveToCurrentTag() { 
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      const tags = this.$refs.tag 
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      this.$nextTick(() => { 
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        for (const tag of tags) { 
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          if (tag.to.path === this.$route.path) { 
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            this.$refs.scrollPane.moveToTarget(tag) 
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            // when query is different then update 
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            if (tag.to.fullPath !== this.$route.fullPath) { 
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              this.$store.dispatch('tagsView/updateVisitedView', this.$route) 
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            } 
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            break 
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          } 
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        } 
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      }) 
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    }, 
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    refreshSelectedTag(view) { 
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      this.$tab.refreshPage(view); 
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      if (this.$route.meta.link) { 
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        this.$store.dispatch('tagsView/delIframeView', this.$route) 
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      } 
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    }, 
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    closeSelectedTag(view) { 
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      this.$tab.closePage(view).then(({ visitedViews }) => { 
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        if (this.isActive(view)) { 
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          this.toLastView(visitedViews, view) 
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        } 
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      }) 
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    }, 
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    closeRightTags() { 
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      this.$tab.closeRightPage(this.selectedTag).then(visitedViews => { 
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        if (!visitedViews.find(i => i.fullPath === this.$route.fullPath)) { 
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          this.toLastView(visitedViews) 
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        } 
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      }) 
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    }, 
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    closeLeftTags() { 
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      this.$tab.closeLeftPage(this.selectedTag).then(visitedViews => { 
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        if (!visitedViews.find(i => i.fullPath === this.$route.fullPath)) { 
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          this.toLastView(visitedViews) 
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        } 
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      }) 
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    }, 
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    closeOthersTags() { 
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      this.$router.push(this.selectedTag).catch(()=>{}); 
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      this.$tab.closeOtherPage(this.selectedTag).then(() => { 
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        this.moveToCurrentTag() 
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      }) 
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    }, 
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    closeAllTags(view) { 
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      this.$tab.closeAllPage().then(({ visitedViews }) => { 
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        if (this.affixTags.some(tag => tag.path === this.$route.path)) { 
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          return 
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        } 
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        this.toLastView(visitedViews, view) 
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      }) 
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    }, 
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    toLastView(visitedViews, view) { 
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      const latestView = visitedViews.slice(-1)[0] 
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      if (latestView) { 
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        this.$router.push(latestView.fullPath) 
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      } else { 
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        // now the default is to redirect to the home page if there is no tags-view, 
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        // you can adjust it according to your needs. 
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        if (view.name === 'Dashboard') { 
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          // to reload home page 
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          this.$router.replace({ path: '/redirect' + view.fullPath }) 
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        } else { 
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          this.$router.push('/') 
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        } 
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      } 
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    }, 
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    openMenu(tag, e) { 
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      const menuMinWidth = 105 
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      const offsetLeft = this.$el.getBoundingClientRect().left // container margin left 
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      const offsetWidth = this.$el.offsetWidth // container width 
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      const maxLeft = offsetWidth - menuMinWidth // left boundary 
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      const left = e.clientX - offsetLeft + 15 // 15: margin right 
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      if (left > maxLeft) { 
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        this.left = maxLeft 
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      } else { 
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        this.left = left 
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      } 
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      this.top = e.clientY 
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      this.visible = true 
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      this.selectedTag = tag 
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    }, 
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    closeMenu() { 
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      this.visible = false 
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    }, 
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    handleScroll() { 
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      this.closeMenu() 
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    } 
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  } 
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} 
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</script> 
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<style lang="scss" scoped> 
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.tags-view-container { 
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  height: 34px; 
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  width: 100%; 
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  background: #fff; 
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  border-bottom: 1px solid #d8dce5; 
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  box-shadow: 0 1px 3px 0 rgba(0, 0, 0, .12), 0 0 3px 0 rgba(0, 0, 0, .04); 
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  .tags-view-wrapper { 
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    .tags-view-item { 
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      display: inline-block; 
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      position: relative; 
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      cursor: pointer; 
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      height: 26px; 
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      line-height: 26px; 
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      border: 1px solid #d8dce5; 
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      color: #495060; 
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      background: #fff; 
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      padding: 0 8px; 
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      font-size: 12px; 
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      margin-left: 5px; 
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      margin-top: 4px; 
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      &:first-of-type { 
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        margin-left: 15px; 
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      } 
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      &:last-of-type { 
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        margin-right: 15px; 
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      } 
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      &.active { 
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        background-color: #42b983; 
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        color: #fff; 
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        border-color: #42b983; 
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        &::before { 
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          content: ''; 
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          background: #fff; 
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          display: inline-block; 
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          width: 8px; 
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          height: 8px; 
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          border-radius: 50%; 
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          position: relative; 
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          margin-right: 2px; 
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        } 
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      } 
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    } 
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  } 
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  .contextmenu { 
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    margin: 0; 
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    background: #fff; 
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    z-index: 3000; 
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    position: absolute; 
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    list-style-type: none; 
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    padding: 5px 0; 
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    border-radius: 4px; 
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    font-size: 12px; 
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    font-weight: 400; 
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    color: #333; 
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    box-shadow: 2px 2px 3px 0 rgba(0, 0, 0, .3); 
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    li { 
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      margin: 0; 
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      padding: 7px 16px; 
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      cursor: pointer; 
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      &:hover { 
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        background: #eee; 
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      } 
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    } 
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  } 
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} 
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</style> 
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<style lang="scss"> 
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//reset element css of el-icon-close 
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.tags-view-wrapper { 
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  .tags-view-item { 
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    .el-icon-close { 
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      width: 16px; 
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      height: 16px; 
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      vertical-align: 2px; 
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      border-radius: 50%; 
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      text-align: center; 
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      transition: all .3s cubic-bezier(.645, .045, .355, 1); 
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      transform-origin: 100% 50%; 
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      &:before { 
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        transform: scale(.6); 
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        display: inline-block; 
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        vertical-align: -3px; 
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      } 
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      &:hover { 
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        background-color: #b4bccc; 
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        color: #fff; 
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      } 
 | 
    } 
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  } 
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} 
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</style> 
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