vue-music 关于Player (播放器组件)--播放和进度条

迷你播放器

1.播放器组件会在各个页面的情况下会打开。 首先在vuex state.js 中定义全局的播放器状态

import {playMode} from 'common/js/config.js';

const state = {
    singer:{},    
    playing:false,    //是否播放
    fullScreen:false,    //是否全屏
    playList:[],   //播放列表
    sequenceList:[],    // 非顺序播放列表
    mode:playMode.sequence,   // 播放模式(顺序0,循环1,随机2)
    currentIndex:-1,  //当前播放索引
}
export default state        


---------------------------------------------
// config.js

export const playMode = {
    sequence:0,
    loop:1,
    random:2
}

 

2.进入播放器页面时获取播放列表数据,改变播放状态   在music-list列表中打开

在song-list 组件中派发事件到父组件,传入当前歌曲的信息和索引

<li @click="selectItem(song,index)" v-for="(song,index) in songs" class="item">

------------------------------
selectItem(item,index){
    this.$emit('select',item,index)
},

在music-list 组件中接受派发事件。

<song-list :rank="rank" :songs="songs" @select="selectItem"></song-list>

 

3. 如果commit 多个状态在actions 里设置

import {playMode} from 'common/js/config.js'

export const selectPlay = function({commit,state},{list,index}){
  commit(types.SET_SEQUENCE_LIST, list)
  commit(types.SET_PLAYLIST, list)
  commit(types.SET_CURRENT_INDEX, index)
  commit(types.SET_FULL_SCREEN, true)
  commit(types.SET_PLAYING_STATE, true)
}

 

4. 在music-list 组件中 用mapActions提交 改变值

import {mapActions} from 'vuex'

methods:{
    selectItem(item,index){
      this.selectPlay({
        list:this.songs,
        index
      })
    },
    ...mapActions([
      'selectPlay'
    ])
  },

 

5.在palyer 中获取vuex 全局状态,赋值状态到相应位置(代码为完整代码,对照后面讲解慢慢理解)

<div class="player" v-show="playList.length>0">    // 如果有列表数据则显示
        <div class="normal-player" v-show="fullScreen">  //如果全屏
          <div class="background">
            <img :src="currentSong.image" alt="" width="100%" height="100%">    //模糊背景图
          </div>
            <div class="top">
              <div class="back" @click="back">
                <i class="icon-back"></i>
              </div>
              <h1 class="title" v-html="currentSong.name"></h1>    //当前歌曲名称
              <h2 class="subtitle" v-html="currentSong.singer"></h2>  //当前歌手名
            </div>
            <div class="middle">
              <div class="middle-l">
                <div class="cd-wrapper">
                  <div class="cd" :class="cdCls">
                    <img :src="currentSong.image" alt="" class="image">    //封面图
                  </div>
                </div>
              </div>
            </div>
            <div class="bottom">
          <div class="progress-wrapper">
            <span class="time time-l">{{ format(currentTime) }}</span>
            <div class="progress-bar-wrapper">
              <progress-bar :percent="percent" @percentChange="onProgressBarChange"></progress-bar>
            </div>
            <span class="time time-r">{{ format(currentSong.duration) }}</span>
          </div>
                 <div class="operators">
                <div class="icon i-left">
                  <i :class="iconMode" @click="changeMode"></i>
                </div>
                    <div class="icon i-left" :class="disableCls">
                        <i @click="prev" class="icon-prev"></i>
                      </div>
                      <div class="icon i-center" :class="disableCls">
                        <i :class="playIcon" @click="togglePlaying"></i>
                      </div>
                      <div class="icon i-right" :class="disableCls">
                        <i @click="next" class="icon-next"></i>
                      </div>
                      <div class="icon i-right">
                        <i class="icon icon-not-favorite"></i>
                      </div>
                </div>
             </div>
         </div>
         </transition>
         <transition name="mini">
              <div class="mini-player" v-show="!fullScreen" @click="open">
                  <div class="icon">
                      <img :src="currentSong.image" alt="" width="40" height="40" :class="cdCls">
                  </div>
                  <div class="text">
                      <h2 class="name" v-html="currentSong.name"></h2>
                      <p class="desc" v-html="currentSong.singer"></p>
                  </div>
                  <div class="control">
                      <i :class="miniIcon" @click.stop="togglePlaying"></i>
                  </div>
                  <div class="control">
                      <i class="icon-playlist"></i>
                  </div>
              </div>
          </transition>
          <audio :src="currentSong.url" ref="audio" @canplay="ready" @error="error" @timeupdate="updateTime" @ended="end"></audio>
  </div>

 

打开播放器的状态

import {mapGetters,mapMutations} from 'vuex';

...mapGetters([
    'fullScreen',
    'playList',
    'currentSong',
    'playing',
    'currentIndex',
])

 

注意:不可在组件中直接赋值改版vuex 中的状态 this.fullScreen = false 需要通过mutations 改变,定义mutation-types 和mutations 然后 用vuex的 mapMutations 代理方法调用

[types.SET_FULL_SCREEN](state, flag) {
    state.fullScreen = flag
  },

import {mapGetters,mapMutations} from 'vuex'; methods:{ ...mapMutations({ setFullScreen:
"SET_FULL_SCREEN", }), back(){ this.setFullScreen(false) }, }

 

设置点击播放按钮方法

 <i :class="playIcon" @click="togglePlaying"></i>
togglePlaying(){
    this.setPlayingState(!this.playing);    //改变全局变量playing 的属性
},

// 然后watch 监听playing 操作实际的audio 标签的播放暂停
watch:{
      playing(newPlaying){
          let audio = this.$refs.audio;
          this.$nextTick(() => {
              newPlaying ? audio.play():audio.pause();
          })
      }
  },

// 用计算属性改变相应的播放暂停图标
playIcon(){
    return this.playing? 'icon-pause':'icon-play'
},

 

设置点击播放上一首和下一首按钮方法。用mapGetters 获取currentIndex 的值(加一或减一) 并改变,从而改变 currentSong 的状态,监听切换播放。判断播放列表界限重置,

prev(){

    if(!this.songReady){
      return;
    }

    let index = this.currentIndex - 1;
    if(index === -1){    //判断播放列表界限重置
        index = this.playList.length-1;
    }
    this.setCurrentIndex(index);
    if(!this.playing){  //判断是否播放改变播放暂停的icon
        this.togglePlaying();
    }
    this.songReady = false;
},
next(){
    if(!this.songReady){
    return;
   }
let index = this.currentIndex + 1; if(index === this.playList.length){    //判断播放列表界限重置 index = 0; } this.setCurrentIndex(index); if(!this.playing){ this.togglePlaying(); } this.songReady = false; },

 

监听audio 元素标签的canpaly 事件,当歌曲加载就绪 和 error 事件,当歌曲发生错误的时候,做用户体验,防止用户快速切换导致报错。

设置songReady 标志位 如果歌曲没有准备就绪,点击下一首的时候直接return false

data(){
    return {
        songReady:false,
    }
},

ready(){
    this.songReady = true;
},
error(){
    this.songReady = true;
},

 

进度条

audio元素监听 timeupdate 事件获取当前播放时间的 可读写属性 时间戳。用formt做格式化时间处理,(_pad 为补零函数 )

获取音频总时长 currentSong.duration 

<div class="progress-wrapper">
  <span class="time time-l">{{ format(currentTime) }}</span>
  <div class="progress-bar-wrapper">
    <progress-bar :percent="percent" @percentChange="onProgressBarChange"></progress-bar>
  </div>
  <span class="time time-r">{{ format(currentSong.duration) }}</span>
</div>

<audio :src="currentSong.url" ref="audio" @canplay="ready" @error="error" @timeupdate="updateTime" @ended="end"></audio>
updateTime(e){
  this.currentTime = e.target.currentTime;    // 获取当前播放时间段
},

format(interval){
  interval = interval | 0;
  const minute = interval/60 | 0;
  const second = this._pad(interval % 60);
  return `${minute}:${second}`;      
},

_pad(num,n=2){
  let len = num.toString().length;
  while(len<n){
    num = '0' + num;
    len ++;
  }
  return num;
},

 

建立progress-bar 组件 接收pencent 进度参数,设置进度条宽度和小球的位置。player组件 设置计算属性percent

percent(){
  return this.currentTime / this.currentSong.duration            // 当前时长除以总时长
},

progress-bar 组件

<div class="progress-bar" ref="progressBar" @click="progressClick">
    <div class="bar-inner">
      <div class="progress" ref="progress"></div>
      <div class="progress-btn-wrapper" ref="progressBtn"
            @touchstart.prevent="progressTouchStart"
            @touchmove.prevent="progressTouchMove"
            @touchend="progressTouchEnd"      
      >
        <div class="progress-btn"></div>
      </div>
    </div>
  </div>
const progressBtnWidth = 16    //小球宽度

props:{
  percent:{
    type:Number,
    default:0
  }
},


watch:{
  percent(newPercent){
    if(newPercent>=0 && !this.touch.initated){    
      const barWidth = this.$refs.progressBar.clientWidth - progressBtnWidth;
      const offsetWidth = newPercent * barWidth;
      this.$refs.progress.style.width = `${offsetWidth}px`;
      this.$refs.progressBtn.style.transform=`translate3d(${offsetWidth}px,0,0)`
    }
  }
}

设置拖动

在进度条小按钮progressBtn 上添加touchstart,touchmove,touchend 事件监听方法,事件添加 prevent 防止拖动默认浏览器行为,获取拖动的信息进行计算

在实例上创建一个touch 对象维护不同的回调之间的通讯共享状态信息。  touchstart事件方法中 ,首先设置this.touch.initated为true,表示拖动开始。  记录开始点击位置 e.touches[0].pageX 存到 touch 对象上,记录当前的进度宽度。

在touchmove 中首先判断 是否先进入了 touchstart 方法,计算得到 移动的位置 减去 点击开始的位置的 偏移量长度。 let deltax = e.touches[0].pageX - this.touch.startX 

就可以 设置进度条 已有的长度加上偏移量长度。最大不能超过父级progressbar 的宽度

调用this._offset(offsetWidth) 方法设置进度条宽度

在touchend 事件方法中将 this.touch.initated 设置为false,表示拖动结束,并派发事件到player 组件将audio的currentTime 值设置为正确值,参数为pencent

在progressbar 中增加点击事件,调用this._offset(e.offsetX),并且派发事件


  created(){
    this.touch = {};
  },

methods:{
  progressTouchStart(e){
    this.touch.initiated = true;
    this.touch.startX = e.touches[0].pageX;
    this.touch.left = this.$refs.progress.clientWidth;
  },
  progressTouchMove(e){
    if(!this.touch.initiated){
      return;
    }
    let deltaX = e.touches[0].pageX - this.touch.startX;
    let offsetWidth = Math.min(this.$refs.progressBar.clientWidth - progressBtnWidth,Math.max(0,this.touch.left + deltaX));
    this._offset(offsetWidth);
  },
  progressTouchEnd(e){
    this.touch.initiated = false;
    this._triggerPercent();
  },
  progressClick(e){
    const rect = this.$refs.progressBar.getBoundingClientRect();
    const offsetWidth = e.pageX - rect.left;
    this._offset(offsetWidth);
    // this._offset(e.offsetX);
    this._triggerPercent();
  },
  _offset(offsetWidth){
    this.$refs.progress.style.width = `${offsetWidth}px`;
    this.$refs.progressBtn.style[transform] = `translate3d(${offsetWidth}px,0,0)`;
  },
  _triggerPercent(){
    const barWidth = this.$refs.progressBar.clientWidth - progressBtnWidth;
    const percent = this.$refs.progress.clientWidth / barWidth;
    this.$emit("percentChange",percent)
  }
},

 

posted @ 2017-11-28 11:47  ankle  阅读(7462)  评论(1编辑  收藏  举报