// 視圖切換動畫邏輯
let history = window.sessionStorage
let historyCount = history.getItem('count') * 1 || 0
function routerTransition (to, from) {
 const toIndex = history.getItem(to.name)
 const fromIndex = history.getItem(from.name)
 let direction = 'forward'
 if (toIndex) {
 if (toIndex >= fromIndex || !fromIndex) {
  store.commit('UPDATE_DIRECTION', {direction})
 } else {
  direction = 'reverse'
  store.commit('UPDATE_DIRECTION', {direction})
 }
 } else {
 ++historyCount
 history.setItem('count', historyCount)
 to.path !== '/' && history.setItem(to.name, historyCount)
 direction = 'forward'
 store.commit('UPDATE_DIRECTION', {direction})
 }
}
router.beforeEach(function (to, from, next) {
 routerTransition(to, from)
 next()
})

<template>
 <div id="app">
  <div v-transfer-dom >
  <loading :show="isLoading" :transition="''"></loading>
  </div>
  <transition :name="viewAnimate">
    <router-view v-if="isNetworkOnline"></router-view>
    <no-network v-if="!isNetworkOnline"></no-network>
  </transition>
 </div>
</template>

<script>
import '@/assets/iconfont/iconfont.css'
import { Loading, TransferDom } from 'vux'
import {mapState} from 'vuex'
import noNetwork from '@/page/system/callback/noNetwork.vue'
export default {
 directives: {
 TransferDom
 },
 computed: {
 ...mapState({
  isLoading: state => state.isLoading,
  direction: state => state.direction,
  isNetworkOnline: state => state.isNetworkOnline
 })
 },
 // dynamically set transition based on route change
 watch: {
 '$route' (to, from) {
  if (this.direction === 'forward') {
  this.viewAnimate = 'slide-left'
  } else {
  this.viewAnimate = 'slide-right'
  }
 }
 },
 data () {
 return {
  viewAnimate: 'slide-left'
 }
 },
 components: {
 Loading,
 noNetwork
 }
}
</script>

<style lang="less">
@import '~vux/src/styles/reset.less';
@import '~vux/src/styles/close.less';
@import '~@/styles/common.less';
body {
 background-color: #fbf9fe;
}
@keyframes slideInLeft {
 from {
  transform: translate3d(100%, 0, 0);
  opacity: 1;
 }
 to {
  transform: translate3d(0, 0, 0);
    opacity: 1;
 }
}
@keyframes slideInRight {
 from {
  transform: translate3d(-100%, 0, 0);
  opacity: 1;
 }
 to {
  transform: translate3d(0, 0, 0);
    opacity: 1;
 }
}
@keyframes slideLeftOut {
 from {
  transform: translate3d(0, 0, 0);
  opacity: 0;
 }
 to {
  transform: translate3d(100%, 0, 0);
  opacity: 0;
 }
}
@keyframes slideRightOut {
 from {
  transform: translate3d(0, 0, 0);
  opacity: 0;
 }
 to {
  transform: translate3d(-100%, 0, 0);
  opacity: 0;
 }
} 
.slide-left-enter-active {
 animation: slideInLeft .3s forwards;
 z-index:5;
}

.slide-left-leave-active {
 animation: slideLeftOut .3s forwards;
 z-index:3;
}
 .slide-right-enter-active {
 animation: slideInRight .3s forwards;
 z-index:5;
}

.slide-right-leave-active {
 animation: slideRightOut .3s forwards;
 z-index:3;
} 
</style>