xianmen-antd/src/components/MultiTab/MultiTab.vue

<script>
import events from './events'

export default {
  name: 'MultiTab',
  data () {
    return {
      fullPathList: [],
      pages: [],
      activeKey: '',
      newTabIndex: 0
    }
  },
  created () {
    // bind event
    events.$on('open', val => {
      if (!val) {
        throw new Error(`multi-tab: open tab ${val} err`)
      }
      this.activeKey = val
    }).$on('close', val => {
      if (!val) {
        this.closeThat(this.activeKey)
        return
      }
      this.closeThat(val)
    }).$on('rename', ({ key, name }) => {
      console.log('rename', key, name)
      try {
        const item = this.pages.find(item => item.path === key)
        item.meta.customTitle = name
        this.$forceUpdate()
      } catch (e) {
      }
    })

    this.pages.push(this.$route)
    this.fullPathList.push(this.$route.fullPath)
    this.selectedLastPath()
    // 当前页面的保活由全局混入在组件 mounted 时自动注册，这里无需手动处理
  },
  methods: {
    onEdit (targetKey, action) {
      this[action](targetKey)
    },
    remove (targetKey) {
      const closedPage = this.pages.find(page => page.fullPath === targetKey)
      this.pages = this.pages.filter(page => page.fullPath !== targetKey)
      this.fullPathList = this.fullPathList.filter(path => path !== targetKey)
      // 判断当前标签是否关闭，若关闭则跳转到最后一个还存在的标签页
      const needNavigate = !this.fullPathList.includes(this.activeKey)
      if (needNavigate) {
        this.selectedLastPath()
      }
      // 清理已关闭标签页的组件缓存
      this.$nextTick(() => {
        this.removePageFromCache(closedPage)
      })
    },
    selectedLastPath () {
      this.activeKey = this.fullPathList[this.fullPathList.length - 1]
    },

    // content menu
    closeThat (e) {
      // 判断是否为最后一个标签页，如果是最后一个，则无法被关闭
      if (this.fullPathList.length > 1) {
        this.remove(e)
      } else {
        this.$message.info('这是最后一个标签了, 无法被关闭')
      }
    },
    closeLeft (e) {
      const currentIndex = this.fullPathList.indexOf(e)
      if (currentIndex > 0) {
        this.fullPathList.forEach((item, index) => {
          if (index < currentIndex) {
            this.remove(item)
          }
        })
      } else {
        this.$message.info('左侧没有标签')
      }
    },
    closeRight (e) {
      const currentIndex = this.fullPathList.indexOf(e)
      if (currentIndex < (this.fullPathList.length - 1)) {
        this.fullPathList.forEach((item, index) => {
          if (index > currentIndex) {
            this.remove(item)
          }
        })
      } else {
        this.$message.info('右侧没有标签')
      }
    },
    closeAll (e) {
      const currentIndex = this.fullPathList.indexOf(e)
      this.fullPathList.forEach((item, index) => {
        if (index !== currentIndex) {
          this.remove(item)
        }
      })
    },
    closeMenuClick (key, route) {
      this[key](route)
    },
    renderTabPaneMenu (e) {
      return (
        <a-menu {...{ on: { click: ({ key, item, domEvent }) => { this.closeMenuClick(key, e) } } }}>
          <a-menu-item key="closeThat">关闭当前标签</a-menu-item>
          <a-menu-item key="closeRight">关闭右侧</a-menu-item>
          <a-menu-item key="closeLeft">关闭左侧</a-menu-item>
          <a-menu-item key="closeAll">关闭全部</a-menu-item>
        </a-menu>
      )
    },
    // render
    renderTabPane (title, keyPath) {
      const menu = this.renderTabPaneMenu(keyPath)

      return (
        <a-dropdown overlay={menu} trigger={['contextmenu']}>
          <span style={{ userSelect: 'none' }}>{ title }</span>
        </a-dropdown>
      )
    },
    /**
     * 解析路由对应的组件名称（关闭页签时的默认处理，正常情况优先用 store 中 mounted 记录的真实 name）
     */
    getRouteComponentName (route) {
      if (!route) return null
      const layoutComponents = ['BasicLayout', 'RouteView', 'PageView', 'UserLayout', 'BlankLayout']
      if (route.matched && route.matched.length > 0) {
        const lastRecord = route.matched[route.matched.length - 1]
        const instance = lastRecord.instances && lastRecord.instances.default
        const instanceName = instance && instance.$options && instance.$options.name
        if (instanceName && !layoutComponents.includes(instanceName)) {
          return instanceName
        }
        const component = lastRecord.components && lastRecord.components.default
        if (component && component.name && !layoutComponents.includes(component.name)) {
          return component.name
        }
      }
      return route.name || null
    },
    /**
     * 关闭标签页时，从缓存中移除对应组件
     * 仅当没有其他打开的标签使用同一组件时才移除
     */
    removePageFromCache (closedPage) {
      if (!closedPage) return
      const fullPath = closedPage.fullPath
      // 优先用页面 mounted 时记入 store 的真实组件名（异步组件名称与路由名常常不一致）
      const componentName = this.$store.state.app.routeCacheMap[fullPath] || this.getRouteComponentName(closedPage)
      // 移除该页签的映射
      this.$store.commit('DEL_ROUTE_CACHE_MAP', fullPath)
      if (!componentName) return
      // 检查是否还有其他打开的标签页使用同一组件
      const stillInUse = this.pages.some(page => {
        return (this.$store.state.app.routeCacheMap[page.fullPath] || this.getRouteComponentName(page)) === componentName
      })
      if (!stillInUse) {
        this.$store.dispatch('DelCachedView', componentName)
      }
    }
  },
  watch: {
    '$route': function (newVal) {
      this.activeKey = newVal.fullPath
      if (this.fullPathList.indexOf(newVal.fullPath) < 0) {
        this.fullPathList.push(newVal.fullPath)
        this.pages.push(newVal)
      }
      // 页面保活的注册由全局混入在组件 mounted 时完成，无需在此手动加入
    },
    activeKey: function (newPathKey) {
      this.$router.push({ path: newPathKey })
    }
  },
  render () {
    const { onEdit, $data: { pages } } = this
    const panes = pages.map(page => {
      return (
        <a-tab-pane
          style={{ height: 0 }}
          tab={this.renderTabPane(page.meta.customTitle || page.meta.title, page.fullPath)}
          key={page.fullPath} closable={pages.length > 1}
        >
        </a-tab-pane>)
    })

    return (
      <div class="ant-pro-multi-tab">
        <div class="ant-pro-multi-tab-wrapper">
          <a-tabs
            hideAdd
            type={'editable-card'}
            v-model={this.activeKey}
            tabBarStyle={{ background: '#FFF', margin: 0, paddingLeft: '16px', paddingTop: '1px' }}
            {...{ on: { edit: onEdit } }}>
            {panes}
          </a-tabs>
        </div>
      </div>
    )
  }
}
</script>