import Vue from 'vue';
export default new Vue();

import Bus from '@/mixins/event-bus'

// 需要传递给兄弟组件的值
let params = { 
  ***
}
Bus.$emit('getParams', params)

import Bus from '@/mixins/event-bus'
created () {
 // 监听事件
 Bus.$on('getParams', params => {
  // to do something

 })
},beforeDestroy () {
 // 清除监听
 Bus.$off('getParams');
}

// swiper动态设置高度，list为需要渲染的数据
autoHeight(list) {
 let num = list.length;
 // this.loadHeight加载提示语的高度
 let listHeight = this.baseItemHeight * num + this.loadHeight
 this.swiperHeight = Math.max(this.windowHeight, listHeight);
},
// 获取静态高度
calcStaticHeight() {
 return new Promise((resolve) => {
  let self = this;
  let tabListHeight; // 获取tab高度
  // 获取除去tabList高度，全屏高度（空态状态时需要）
  wx.createSelectorQuery().select('#tab-list').fields({
   size: true
  }, function (res) {
   tabListHeight = res.height
   wx.getSystemInfo({
    success: function(resp) {
     self.windowHeight = resp.windowHeight - tabListHeight
    }
   })
  }).exec()
  // 获取单个item高度
  wx.createSelectorQuery().select('#base-item').fields({
   size: true
  }, function (res) {
   self.baseItemHeight = res.height
   resolve()
  }).exec()
 })
}

// 滑动切换
swiperTab (e) {
 // 如果是触摸滑动切换
 if (e.mp.detail.source === 'touch') {
  if (this.currentTab === e.mp.detail.current) {
   return false;
  } else {
   this.currentTab = e.mp.detail.current
   this.isLoading = false
   this.allLoaded = false
   this.pageNum = 1
   this.loadTips = '上拉加载更多'
   this.getDataList(this.loadTips);
  }
 }
},
// 点击切换
clickTab (tab) {
 if (this.currentTab === tab) {
  return false;
 } else {
  this.currentTab = tab
  this.allLoaded = false
  this.pageNum = 1
  this.loadTips = '上拉加载更多'
  this.getDataList(this.loadTips);
 }
},

// 索引定位(滑动开始) @touchstart="handlerStart"
handlerStart (e) {
 this.targetIndex = e.mp.target.id
},
// 索引定位(滑动过程) @touchmove="handlerMove"
handlerMove(e) {
 let keyList = this.keyList;
 // 手指滑动垂直距离
 let moveY = e.mp.touches[0].clientY;
 let rY = moveY - this.offsetTop;
 if (rY >= 0) {
  // apHeight为字母表indexList中单个字母块高度，计算结果向上取整
  let index = Math.ceil((rY - this.apHeight) / this.apHeight);
  if (index >= 0 && index < keyList.length) {
   this.targetIndex = keyList[index];
  }
 } else {
  this.targetIndex = keyList[0]
 }
},