<template>
 <div>
  <div
   class="iconfont icon-shuaxin"
   :animation='refreshA'
   @click="refresh"
   :style='style'></div>
 </div>
</template>

<script>
export default {
 data () {
  return {
   refreshA: null,
   style: 'color: #eee;',
   // 用来设置存储旋转的度数
   rotate: 0,
   // 存储定时器id
   refreshI: null
  }
 },
 props: ['refreshing']
}
</script>

<script>
export default {
 methods: {
  // 刷新按钮点击
  refresh () {
   // 正在刷新 则跳出，避免在循环动画执行时，再次出发点击刷新事件
   if (this.refreshing) return
   // 否则提交刷新事件
   this.$emit('refresh')
  },
  // 刷新动画结束
  refreshend () {
   // 当动画结束，字体颜色恢复原来
   this.style = 'color: #eee;'
  }
 }
}
</script>

<script>
export default {
 watch: {
  refreshing (newV, oldV) {
   // 没有正在刷新 > 正在刷新 设置循环动画
   if (newV && !oldV) {
    this.style = 'color: #fff;'
    this.refreshI = setInterval(() => {
    // 每次 +360 实现每 300 毫秒旋转 360 度 
     this.rotate += 360
     let animation = wx.createAnimation()
     animation.rotateZ(this.rotate).step()
     this.refreshA = animation.export()
    }, 300)
    return
   }
   // 从正在刷新 > 刷新完成 清空循环定时器动画
   if (!newV && oldV) {
    clearInterval(this.refreshI)
    this.refreshA = null
   }
  }
 }
}
</script>

<template>
 <div>
  <Refresh @refresh='refresh' :refreshing='refreshing'/>
 </div>
</template>

<script>
import Refresh from '@/components/refresh'

export default {
 data: {
  // 初始状态肯定为 false ,点击刷新组件后，在事件函数中再设置为 true
  refreshing: false
 },
 components: {
  Refresh
 },
 methods: {
  async refresh () {
  this.refreshing = true
  // 这里为一个异步请求api
  let data = await api.getData()
  // 请求完成，执行想要操作的代码后，设置动画为 false
  // this.data = data
  this.refreshing = false
  }
 }
}
</script>

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

<template>
 <div>
  <div
   class="iconfont icon-shuaxin"
   :animation='refreshA'
   @click="refresh"
   :style='style'></div>
 </div>
</template>

<script>
export default {
 data () {
  return {
   refreshA: null,
   style: 'color: #eee;',
   rotate: 0,
   refreshI: null
  }
 },
 props: ['refreshing'],
 watch: {
  refreshing (newV, oldV) {
   if (newV && !oldV) {
    this.style = 'color: #fff;'
    this.refreshI = setInterval(() => {
     this.rotate += 360
     let animation = wx.createAnimation()
     animation.rotateZ(this.rotate).step()
     this.refreshA = animation.export()
    }, 300)
    return
   }
   if (!newV && oldV) {
    clearInterval(this.refreshI)
    this.refreshA = null
   }
  }
 },
 methods: {
  refresh () {
   if (this.refreshing) return
   this.$emit('refresh')
  },
  refreshend () {
   this.style = 'color: #eee;'
  }
 }
}
</script>

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