<template lang="html">
  <div class="">
    <van-pull-refresh
      v-model="refreshing"
      @refresh="onRefresh">
      <van-list
        v-model="loading"
        :finished="finished"
        finished-text="没有更多了"
        @load="onLoad">
          <van-cell
            @click.native="onClick()"
            v-for="item in list"
            :key="item"
            :title="item + ''"/>
      </van-list>
    </van-pull-refresh>

    <van-dialog
        v-model="show"
        show-cancel-button
        :before-close="beforeClose"
      >
        <van-field
          v-model="username"
          label="用户名"
          placeholder="请输入"
        />
        <van-field
          v-model="password"
          type="password"
          label="密码"
          placeholder="请输入"
        />
        <van-field
          v-model="username"
          label="用户名"
          placeholder="请输入"
        />
        <van-field
          v-model="password"
          type="password"
          label="密码"
          placeholder="请输入"
        />
        <van-field
          v-model="username"
          label="用户名"
          placeholder="请输入"
        />
        <van-field
          v-model="password"
          type="password"
          label="密码"
          placeholder="请输入"
        />
        <van-field
          v-model="username"
          label="用户名"
          placeholder="请输入"
        />
        <van-field
          @blur="onBlur"
          v-model="password"
          type="password"
          label="密码"
          placeholder="请输入"
        />
      </van-dialog>
  </div>
</template>

<script>
import { ImagePreview } from 'vant';

// const images = [
//   'https://img.yzcdn.cn/public_files/2017/09/05/3bd347e44233a868c99cf0fe560232be.jpg',
//   'https://img.yzcdn.cn/public_files/2017/09/05/c0dab461920687911536621b345a0bc9.jpg'
// ];

export default {
  data () {
    return {
      list: [],
      refreshing: false,
      loading: false,
      finished: false,
      show: false,
      username: '',
      password: '',
      images: []
    }
  },
  methods: {
    onLoad () {
      setTimeout(() => {
        for (let i = 0; i < 10; i++) {
          const text = this.list.length + 1
          this.list.push(text < 10 ? '0' + text : text)
        }
        this.loading = false
        if (this.list.length >= 40) {
          this.finished = true
        }
      }, 500)
    },
    onRefresh () {
      setTimeout(() => {
        this.list = []
        this.finished = false
        this.refreshing = false
        window.scrollTo(0, 10)
      }, 1000)
    },
    onClick () {
      if (_.random(1, true) > 0.5) {
        const images = [
          'https://img.yzcdn.cn/public_files/2017/09/05/3bd347e44233a868c99cf0fe560232be.jpg'
        ];
        this.showImagePreview(images);
      } else {
        const images = [
          'https://img.yzcdn.cn/public_files/2017/09/05/c0dab461920687911536621b345a0bc9.jpg'
        ];
        this.showImagePreview(images);
      }
    },
    beforeClose (action, done) {
      if (action === 'confirm') {
        setTimeout(done, 1000);
      } else {
        done();
      }
    },
    onBlur (e) {
      document.body && (document.body.scrollTop = document.body.scrollTop);
    },
    showImagePreview (images, position, timer) {
      const instance = ImagePreview({
        images,
        asyncClose: !!timer,
        startPosition: typeof position === 'number' ? position : 0,
        showIndex: false
      });
      if (timer) {
        setTimeout(() => {
          instance.close();
        }, timer);
      }
    }
  }
}
</script>

<style lang="less" scoped>
</style>