<template>
  <div>
  <el-row>
   <el-col :span="4">
    <el-popover
    placement="top-start"
    trigger="hover">
     <div >
      <el-progress 
      color="#67C23A"
      type="circle" 
      :percentage="music.volume"></el-progress><br>
      <el-button 
      @click="changeVolume(-10)"
      icon="el-icon-minus" 
      circle></el-button>
      <el-button 
      @click="changeVolume(10)"
      icon="el-icon-plus" 
      circle></el-button>
     </div>
     <el-button 
     @click="play"
     id="play"
     slot="reference"
     :icon="music.isPlay?'el-icon-refresh':'el-icon-caret-right'" 
     circle></el-button>
    </el-popover>
   </el-col>
   <el-col :span="14" >
    <el-slider
    @change="changeTime"
    :format-tooltip="formatTime"
    :max="music.maxTime"
    v-model="music.currentTime" 
    ></el-slider>
   </el-col>
   <el-col :span="6" >
    {{formatTime(music.currentTime)}}/{{formatTime(music.maxTime)}}
   </el-col>
  </el-row>
  <audio ref="music" loop autoplay> 
   <source src="http://sc1.111ttt.cn:8282/2018/1/03m/13/396131232171.m4a?tflag=1519095601&pin=6cd414115fdb9a950d827487b16b5f97#.mp3" type="audio/mpeg">
  </audio>
 </div>
</template>
<script>
 export default{
  data(){
   return {
    music:{
     isPlay:false,
     currentTime:0,
     maxTime:0,
     volume:100
    }
   }
  },
  mounted(){
   this.$nextTick(()=>{
    setInterval(this.listenMusic,1000)
   })
  },
  methods:{
   listenMusic(){
    if(!this.$refs.music){
     return
    }
    if(this.$refs.music.readyState){
     this.music.maxTime = this.$refs.music.duration
    }
    this.music.isPlay=!this.$refs.music.paused
    this.music.currentTime = this.$refs.music.currentTime
   },
   play(){
    if(this.$refs.music.paused){
     this.$refs.music.play()
    }else{
     this.$refs.music.pause()
    }
    this.music.isPlay=!this.$refs.music.paused
    this.$nextTick(()=>{
     document.getElementById('play').blur()
    })
   },
   changeTime(time){
    this.$refs.music.currentTime = time
   },
   changeVolume(v){
    this.music.volume += v 
    if(this.music.volume>100){
     this.music.volume = 100
    }
    if(this.music.volume<0){
     this.music.volume = 0
    }
    this.$refs.music.volume = this.music.volume/100
   },
   formatTime(time){
    let it = parseInt(time)
    let m = parseInt(it/60)
    let s = parseInt(it%60)
    return (m<10?"0":"")+parseInt(it/60)+":"+(s<10?"0":"")+parseInt(it%60)
   }
  } 
 }
</script>