如何用VUX search @on-focus组件显示List的所有元素？

Question

在VUX文档后想用VUX的Search组件写一个模糊查询功能。
需求是当 获得input焦点的时候 显示list里的所有元素。 VUX的search demo文档只有在@on-change的时候会出现列表。
下面是VUX官网的search demo

<template>
  <div>
    <img src="https://ws1.sinaimg.cn/large/663d3650gy1fq685v5csyj208c06ygm0.jpg" style="width: 100%">
    <search
      @result-click="resultClick"
      @on-change="getResult"
      :results="results"
      v-model="value"
      position="absolute"
      auto-scroll-to-top
      top="46px"
      @on-focus="onFocus"
      @on-cancel="onCancel"
      @on-submit="onSubmit"
      ref="search"></search>
    <group>
      <cell title="keyword">{{ value }}</cell>
    </group>

    <div style="padding:15px;">
      <x-button
        @click.native="setFocus"
        type="primary">set focus</x-button>
    </div>
    <group>
      <cell
        title="static position demo"
        is-link
        link="/component/search-static"></cell>
    </group>
  </div>
</template>

<script>
import { Search, Group, Cell, XButton } from 'vux'

export default {
  components: {
    Search,
    Group,
    Cell,
    XButton
  },
  methods: {
    setFocus () {
      this.$refs.search.setFocus()
    },
    resultClick (item) {
      window.alert('you click the result item: ' + JSON.stringify(item))
    },
    getResult (val) {
      console.log('on-change', val)
      this.results = val ? getResult(this.value) : []
    },
    onSubmit () {
      this.$refs.search.setBlur()
      this.$vux.toast.show({
        type: 'text',
        position: 'top',
        text: 'on submit'
      })
    },
    onFocus () {
      console.log('on focus')
    },
    onCancel () {
      console.log('on cancel')
    }
  },
  data () {
    return {
      results: [],
      value: 'test'
    }
  }
}

function getResult (val) {
  let rs = []
  for (let i = 0; i < 20; i++) {
    rs.push({
      title: `${val} result: ${i + 1} `,
      other: i
    })
  }
  return rs
}
</script>

假如results列表是[A,B,C,D,E]。怎样在@on-focus的时候出现所有List的值？
效果图如下