# 2.2 首页背景（Background）

<template>
  <!-- :style="{backgroundColor:startColor}" -->
  <div class="wrapper">
    <image :class="['wrapper-background']" :src="backgroundImg"></image>
    <dof-minibar
      title="设备"
      background-color="transparent"
      @dofMinibarLeftButtonClicked="back"
      :right-button="rightButtonBlack"
    >
      <dof-tab-page
        type="primary"
        slot="middle"
        :is-slot="true"
        ref="dof-tab-page"
        :tabStyles="{ bgColor: 'transparent' }"
        :tab-titles="navTabTitles"
        @dofTabSelected="tabChangeHandler"
      ></dof-tab-page>
    </dof-minibar>
    <scroller class="scroller" show-scrollbar="false" :offset-accuracy="20">
      <div :style="{ height: '706px' }"></div>
      <!-- <dof-gradient :width="width" :height="height" :startColor="startColor" :endColor="endColor"></dof-gradient> -->
      <div class="board-box">
        <dof-board>
          <dof-card class="m-b-10">
            <div class="placeholder"></div>
          </dof-card>
          <dof-row class="m-b-10">
            <dof-col>
              <dof-card>
                <div class="placeholder"></div>
              </dof-card>
            </dof-col>
            <dof-col>
              <dof-card>
                <div class="placeholder"></div>
              </dof-card>
            </dof-col>
          </dof-row>
          <dof-row class="m-b-10">
            <dof-col>
              <dof-card>
                <div class="placeholder"></div>
              </dof-card>
            </dof-col>
          </dof-row>
          <dof-row class="m-b-10">
            <dof-col>
              <dof-card>
                <div class="placeholder"></div>
              </dof-card>
            </dof-col>
            <dof-col>
              <dof-card>
                <div class="placeholder"></div>
              </dof-card>
            </dof-col>
          </dof-row>
          <dof-row class="m-b-10">
            <dof-col>
              <dof-card>
                <div class="placeholder"></div>
              </dof-card>
            </dof-col>
          </dof-row>
        </dof-board>
      </div>
      <div class="h-300px"></div>
      <dof-bottom-bar :tabGroups="tabTitles"></dof-bottom-bar>
    </scroller>
  </div>
</template>

<style scoped>
.wrapper {
  background-color: #ffffff;
  position: relative;
}
.wrapper-background {
  position: absolute;
  top: 0;
  left: 0;
  bottom: 0;
  right: 0;
  width: 750px;
  height: 750px;
  opacity: 1;
  z-index: 1;
}
.scroller {
  position: relative;
  flex: 1;
  /* background-color: #00A4F2; */
  /* background-image: linear-gradient(to top, #ffffff, #00A4F2); */
  width: 750px;
  height: 1500px;
  padding-bottom: 160px;
}

.backgroundTopColor {
  position: absolute;
  top: -1000px;
  width: 750px;
  height: 1000px;
}
.board-box {
  background-color: #ffffff;
}

.m-b-10 {
  margin-bottom: 20px;
}
.h-300px {
  width: 750px;
  height: 0;
  padding-bottom: 300px;
  background-color: #ffffff;
}
.placeholder {
  height: 160px;
}
</style>

<script>
import Title from 'src/_mods/title.vue'
import Category from 'src/_mods/catalog'
import {
  DofMinibar,
  DofTabPage,
  DofGradient,
  DofBoard,
  DofRow,
  DofCol,
  DofCardGroup,
  DofCard,
  DofCardItem,
  DofBottomBar
} from 'dolphin-weex-ui'
const modal = weex.requireModule('modal')
import nativeService from '@/service/nativeService.js'

module.exports = {
  components: {
    Title,
    Category,
    DofMinibar,
    DofTabPage,
    DofGradient,
    DofBoard,
    DofRow,
    DofCol,
    DofCardGroup,
    DofCard,
    DofCardItem,
    DofBottomBar
  },
  data() {
    return {
      navTabTitles: [
        {
          title: '设备'
        },
        {
          title: '推荐'
        }
      ],
      rightButtonBlack: './assets/image/header/icon_more_black@3x.png',
      leftButton: 'http://dolphin-weex-dev.msmartlife.cn/cdn/images/header/icon_back_white@3x.png',
      width: '750',
      height: '700',
      startColor: '',
      endColor: '#FFFFFF',
      tabTitles: [
        {
          type: 'power',
          title: 'power',
          text: '开关',
          iconColor: '#f2f2f2',
          disabled: false,
          icon: 'http://dolphin-weex-dev.msmartlife.cn/cdn/images/sample/water_heater/calorifier_icon_on@3x.png'
        }
      ]
    }
  },
  computed: {
    statusBarHeight: function() {
      let result = '20'
      if (weex.config.env.statusBarHeight) {
        if (weex.config.env.platform === 'iOS') {
          // iOS使用pt为单位
          result = weex.config.env.statusBarHeight
        } else {
          // 安卓使用px为单位
          result = weex.config.env.statusBarHeight / weex.config.env.scale
        }
      }
      return result
    },
    newBarStyle() {
      let result
      let isIPhoneSE = weex.config.env.deviceModel.substr(6) === '12,8'
      result = {
        paddingTop: (isIPhoneSE ? 20 : this.statusBarHeight) + 'wx'
        // marginTop: '88px'
      }
      return result
    },
    backgroundImg() {
      const val = this.startColor.substring(1).toUpperCase()
      console.log(`./assets/image/gradient/home_bg_${val}@3x.png`)
      return `./assets/image/gradient/home_bg_${val}@3x.png`
    }
  },

  mounted() {
    let value = nativeService.getParameters('value') || '#00A4F2'
    this.height = 600
    this.startColor = value
    this.tabTitles[0]['iconColor'] = value
    const { deviceHeight } = weex.config.env
    Brid
  },
  methods: {
    back() {},
    tabChangeHandler(e) {
      const self = this
      const { index } = e
      this.$toast(index)
    }
  }
}
</script>