vue3 element-plus二次封装组件系列之伸缩菜单制作

<template>
  <div class="common-layout">
    <el-container>
      <!-- 侧边栏菜单 -->
      <el-aside width="auto">
        <nav-menu :collpase="state.isCollapse"/>
      </el-aside>
      <el-container>
        <el-header>
          <nav-header v-model:collpase="state.isCollapse" />
        </el-header>
        <el-main>Main</el-main>
      </el-container>
    </el-container>
  </div>
</template>
 
<script setup lang='ts'>
import {ref, reactive } from 'vue'
import NavMenu from '@/components/navMenu/index.vue'
import NavHeader from '@/components/navHeader/index.vue'
 
const state = reactive({
  // 控制折叠与展开
  isCollapse: false
})
 
</script>
<style scoped lang="scss">
  .common-layout {
    width: 100%;
    height: 100%;
    .el-container {
      height: 100%;
      // 就是不折叠的时候宽度是200px，折叠的时候宽度自适应
    }
  }
  svg {
    width: 1em;
    height: 1em;
    margin-right: 5px;
  }
</style>

<template>
  <el-menu
    default-active="2"
    class="el-menu-vertical-demo"
    :collapse="props.collpase"
  >
    <el-menu-item index="1">
      <el-icon-menu />
      <template #title>图标选择器</template>
    </el-menu-item>
    <el-menu-item index="2">
      <el-icon-aim />
      <template #title>省市区组件</template>
    </el-menu-item>
    <el-menu-item index="3">
      <el-icon-star />
      <template #title>待定</template>
    </el-menu-item>
  </el-menu>
</template>
 
<script setup lang='ts'>
const props = defineProps<{
  collpase: boolean
}>()
</script>
<style scoped lang="scss">
  svg {
    width: 1em;
    height: 1em;
    margin-right: 5px;
  }
  // 记得要有这个，控制侧边菜单宽度，意思是折叠的时候，宽度自适应，不着折叠的时候宽度为200px
  .el-menu-vertical-demo:not(.el-menu--collapse) {
    width: 200px;
    min-height: 400px;
  }
  .el-menu {
    height: 100%;
  }
</style>

<template>
  <div class="collapse" @click="handleCollapse">
    <el-icon-expand v-if="props.collpase"></el-icon-expand>
    <el-icon-fold v-else></el-icon-fold>
  </div>
</template>
 
<script setup lang='ts'>
const  props = defineProps<{
  collpase: boolean
}>()
const emits = defineEmits<{
  // 这样写，父组件通过v-model传值进来，父组件那边就不用在定义事件改变这里传过去的值了
  // update:collpase 就会自动改变v-model传过来的值了
  (e:'update:collpase', value:boolean):void
}>()
 
const handleCollapse = ()=>{
  emits('update:collpase', !props.collpase)
}
 
</script>
<style scoped lang="scss">
.collapse {
  width: 2em;
  svg {
    width: 2em;
    height: 2em;
  }
}
</style>