<template>
  <a-layout id="components-layout-demo-custom-trigger" style="height:100%">
    <a-layout-sider theme="light" v-model="collapsed" :trigger="null" collapsible>
      <div >
          <a-menu
            :inlineIndent="inlineIndent"
            :defaultSelectedKeys="[$route.path]"
            :openKeys="openKeys"
            mode="inline"
            :inline-collapsed="collapsed"
            @openChange="onOpenChange"
            @click="menuClick">
            <!-- 菜單遍歷的開始 -->
            <template v-for="item in list">
              <!-- 如果當(dāng)前遍歷項沒有children，視為子菜單項，注意所有的key都是path用于路由跳轉(zhuǎn)，以及當(dāng)前選中記錄 -->
              <a-menu-item v-if="!item.children" :key="item.path">
                <i :class="item.icon" />
                <span>{{ item.title }}</span>
              </a-menu-item>
              <!-- 否則視為子菜單，傳入菜單信息并且運(yùn)用下面定義的函數(shù)式組件 -->
              <sub-menu v-else :key="item.path" :menu-info="item" />
            </template>
        </a-menu>
      </div>
    </a-layout-sider>
    <a-layout>
      <a-layout-content :style="{ margin: '24px 16px', padding: '24px', background: '#fff', minHeight: '280px' }">
        <router-view/>
      </a-layout-content>
    </a-layout>
  </a-layout>
</template>
<script>
import { Menu } from 'ant-design-vue';
// 定義函數(shù)式組件
const SubMenu = {
  template: `
      <a-sub-menu :key="menuInfo.path" v-bind="$props" v-on="$listeners">
        <span slot="title">
          <i :class="menuInfo.icon" /><span>{{ menuInfo.title }}</span>
        </span>
        <template v-for="item in menuInfo.children">
          <a-menu-item v-if="!item.children" :key="item.path">
            <i :class="item.icon" />
            <span>{{ item.title }}</span>
          </a-menu-item>
          <sub-menu v-else :key="item.path" :menu-info="item" />
        </template>
      </a-sub-menu>
    `,
  name: 'SubMenu',
  // must add isSubMenu: true 此項必須被定義
  isSubMenu: true,
  props: {
    // 解構(gòu)a-sub-menu的屬性，也就是文章開頭提到的為什么使用函數(shù)式組件
    ...Menu.SubMenu.props,
    // 接收父級傳遞過來的菜單信息
    menuInfo: {
      type: Object,
      default: () => ({}),
    },
  },
};
export default {
  data() {
    return {
      // 菜單縮進(jìn)
      inlineIndent:12,
      // 默認(rèn)不折疊
      collapsed: false,
      // 全部頂級父節(jié)點(diǎn),用來控制所有父級菜單只展開其中的一項，可用遍歷菜單信息進(jìn)行賦值
      rootSubmenuKeys: ['/infomationManage','/safeInfoManage','/qualityInfoManage'],
      // 展開的父菜單項
      openKeys: [], 
      // 選中的子菜單項
      defaultSelectedKeys: [this.$route.path], 
      // 菜單信息，可從后臺獲取
      list: [
        {
          key: '1',
          title: '項目信息管理',
          path: '/infomationManage',
          icon:'iconfont icon-information'
        },
        {
          key: '2',
          title: '安全信息管理',
          path: '/safeInfoManage',
          icon:'iconfont icon-anquan',
          children: [
            {
              key: '2.1',
              title: '安全風(fēng)險管理',
              path: '/safeRisk',
              icon:'',
              children: [
                { 
                  key: '2.1.1',
                  title: '風(fēng)險分類管理',
                  path: '/riskClassifyManage',
                  icon:'',
                },
                {
                    key: '2.1.2',
                    title: '分類辨識',
                    path: '/classifyIdentity',
                    icon:'',
                }
              ],
            },
          ],
        },
        {
          key: '3',
          title: '質(zhì)量信息管理',
          path: '/qualityInfoManage',
          icon:'iconfont icon-zhiliang',
          children:[
              {
                  key: '3.1',
                  title: '質(zhì)量控制點(diǎn)管理',
                  path: '/controlPointManage',
                  icon:'',
              }
          ]
        }
      ],
    }
  },
  created(){
    // 將從緩存中取出openKeys
    const openKeys = window.sessionStorage.getItem('openKeys')
    if(openKeys){
      // 存在即賦值
      this.openKeys = JSON.parse(openKeys)
    }
  },
  methods: {
    // 點(diǎn)擊菜單，路由跳轉(zhuǎn),注意的是當(dāng)點(diǎn)擊MenuItem才會觸發(fā)此函數(shù)
    menuClick({ item, key, keyPath }) {
      // 獲取到當(dāng)前的key,并且跳轉(zhuǎn)
      this.$router.push({
        path: key
      })
    },
    onOpenChange(openKeys) {
      // 將當(dāng)前打開的父級菜單存入緩存中
      window.sessionStorage.setItem('openKeys', JSON.stringify(openKeys))
      //  控制只打開一個
      const latestOpenKey = openKeys.find(key => this.openKeys.indexOf(key) === -1);
      if (this.rootSubmenuKeys.indexOf(latestOpenKey) === -1) {
        this.openKeys = openKeys;
      } else {
        this.openKeys = latestOpenKey ? [latestOpenKey] : [];
      }
    },
  },
  // 注冊局部組件
  components: {
    'sub-menu': SubMenu,
  },
};
</script>
<style>
</style>