网易云歌词居中滚动、点击/滑动进度条对应滚动、当前播放歌词高亮

短命女 2021-07-24 12:38 740阅读 0赞

当前播放歌词高亮:
    	根据当前播放时间,和歌词时间对比,获得当前歌词行数索引
    
    正常居中滚动、点击/滑动进度条对应滚动:
    	(1)因为这几种方式都是改变当前播放时间,所以只需要根据当前播放时间操作即可
    	
    	(2)根据当前播放时间,得到当前歌词行数,因为设置歌词和空白高度都是一定的,所以可以根据行数确定居中位置
    	
    	(3)当行数小于指定行或大于指定行时,滚动顶部/底部,在其中居中
    		居中方式:将滚动条移动=当前行到顶部的距离(-90是因为父元素到滑动区域的距离有90)-行高度*在多少(n)行就可居中

效果图:  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzI5NDU2MA_size_16_color_FFFFFF_t_70_pic_center]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzI5NDU2MA_size_16_color_FFFFFF_t_70_pic_center 1]  
![在这里插入图片描述][watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzI5NDU2MA_size_16_color_FFFFFF_t_70_pic_center 2]  
代码示例:

<template>
       <div class='s'>
        <div class='scale' @click="scale">
             <span><a-icon type="fullscreen-exit" /></span>
        </div>
         <div class='b-i'>
             <img height="100px" :src="imgUrl" alt="">
         </div> 
    
         <div class='c-c' :class={ done:!isplay,on:isplay}>
             <img :src="imgUrl" alt="">
         </div> 
    
         <div class='c-l'>
             <div class='c-i'>
                <p>海阔天空</p>
                <div>歌手: beyond</div>
             </div>
             <div class='c-lyr' ref='scroll' >
                 <ul ref='ul'>
                     
                     
                         
                     <li v-for="(item,index) in lyrs" :key='index'  :class='{hight:index==highlightLine}'>
                         { { item.lyr}}
                     </li>
                 </ul>
             </div>
         </div>
    
       </div>
    </template>
    
    <script>
    import axios from 'axios';
    
    export default { 
      name:'song',
      props:['isplay','time'],
      data(){ 
        return{ 
          imgUrl:'',
          lyric:'',
          lyrs:[],
          lis:[],
          tops:[],
          highlightLine:0
        }
      },
      methods:{ 
          scale()
          { 
              this.$emit('mini')
          },
          //正则处理歌词
          regRex(str)
          { 
    
            // var reg= /(ru)n(oob)/i
            //获取歌词贡献者
              let regUser=/\[(.*)\]\n/igm
    
              let user=regUser.exec(str);
              str=str.substring(user[0].length,str.length);
            
            //匹配歌词
              let reg=/\[(.*)\](.*)\n/igm
              let res;
              while(res=reg.exec(str))
              { 
    
                this.lyrs.push({ time:this._timeForm(res[1]),lyr:res[2]});
              }
              console.log(this.lyrs);
          },
          //将字符串xx:xx的时间格式处理成秒
          _timeForm(time)
          { 
              let index=time.indexOf(':');
              let min=time.substring(0,index);
              let seconds=time.substring(index+1,time.length);
              return min*60+seconds*1
        
          },
          //获取每一个歌词li的高度
          _initTops(arr)
          { 
              let tops=[];
              Array.from(arr).forEach((item,index)=>{ 
                
                tops.push(item.offsetTop);
                
              })
              this.tops=tops;
              console.log(this.tops);
          },
          //监听任意方式得到的当前播放时间,来进行对象滚动,当index在歌词前五行和后无行时,进行居中
          //歌词和空白都是固定高度,所以可以通过歌词的行数来确定居中
          //居中方式:当前行到顶部的距离(-90是因为父元素到滑动区域的距离有90)-在多少行就可以居中
          _scrollTo(index)
          { 
            console.log(index);
            if(index<5)
            { 
                this.$refs.scroll.scrollTop=0;
            }else if(index>=(this.lyrs.length-5))
            { 
                this.$refs.scroll.scrollTop=this.$refs.scroll.scrollHeight;
            }else{ 
                this.$refs.scroll.scrollTop=this.tops[index]-90-(this.tops[index+1]-this.tops[index])*4
            }
         }
      },
      computed()
      { 
          song()
          { 
            // if
          }
      },
        async mounted () { 
            let imgRes=await axios.get('https://api.imjad.cn/cloudmusic/?type=detail&id=346089');
            let lyricRes=await axios.get('https://api.imjad.cn/cloudmusic/?type=lyric&id=346089');
            this.imgUrl=imgRes.data.songs[0].al.picUrl;
            this.lyric=lyricRes.data.lrc.lyric;
            this.regRex(this.lyric);
    
        
        },
        watch:{ 
            lyrs()
            { 
                this.$nextTick(()=>{ 
      
                    this._initTops(this.$refs.ul.children);
                    
                    console.log(this.$refs.ul.children);
    
                })
            },
            //监听当前播放时间,和转换后的歌词时间进行对比,获得当前时间对应的歌词行数
            //第一行时间之前,直接制顶,否则会因为findIndex找不到从而获取到最后一行的索引
            time(time)
            { 
                if(time<this.lyrs[0].time)
                { 
                    this.$refs.scroll.scrollTop=0;
                    return ;
                }
                let index=this.lyrs.findIndex((item,index)=>{ 
                    if(index<this.lyrs.length-1)
                    { 
                        return item.time<=time&&this.lyrs[index+1].time>=time
                    }else{ 
    
                        return true;
                    }
    
                    
                })
                console.log('第二个');
                this._scrollTo(index);
                this.highlightLine=index;
            }
    
        },
    
    
    }
    </script>
    
    <style scoped lang='less'>
        .s{ 
            position: relative;
            height: 500px;
            width: 100%;
            >.scale{ 
                position: absolute;
                right: 40px;
                top:40px;
                width: 30px;
                height: 20px;
                border:solid 1px #ccc;
                border-radius: 4px;
                text-align: center;
                line-height: 20px;
                cursor: pointer;
            }
            .b-i{ 
                position: absolute;
                left: 25%;
                >img{ 
                    width: 400px;
                    height: 400px;
                    filter:blur(20px) opacity(0.5);
                }
            }
            .c-c{ 
                height: 300px;
                width: 300px;
                border-radius: 300px;
                background: #2B2C2F;
                text-align: center;
                line-height: 300px;
                position: absolute;
                left: 0;
                margin: 80px 80px;
                animation: rot 20s linear infinite;
                >img{ 
                    height: 200px;
                    width: 200px;
                    border-radius: 200px;
                    
                }
            }
            .on{ 
                animation-play-state:running;
            }
            .done{ 
                animation-play-state:paused;
            }
    
            @keyframes rot { 
                from { 
                    transform: rotate(0deg);
                }
                to{ 
                    transform: rotate(360deg);
                }
            }
            .c-l{ 
                height: 450px;
                width: 400px;
                position: absolute;
                overflow: hidden;
                right: 70px;
                top:40px;
                box-sizing: border-box;
                display: flex;
                flex-direction: column;
                .c-i{ 
                    flex: 1;
                    >p{ 
                        font-weight: 500;
                        font-size:20px;
                        margin-bottom:10px;
                        
                    }
                    margin-bottom:30px;
                }
                .c-lyr{ 
                    flex:8;
                    width: 100%;
                    overflow-y:scroll ;
                    >ul{ 
                        height: 100%;
                        list-style: none;
    
                        li{ 
                            height: 35px;
                            // padding: 7px 0;
                            line-height: 35px;
                            color: #555254;
                        }
                        .hight{ 
                            color:white;
                        }
    
                    }
                }
                .c-lyr::-webkit-scrollbar { 
                    width: 8px;
                    background-color:#FAFAFA;
                }
                .c-lyr::-webkit-scrollbar-thumb { 
                    border-radius: 10px;
                    background-color:#E1E1E2;
                }
            }
    
    
        }
    </style>

[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzI5NDU2MA_size_16_color_FFFFFF_t_70_pic_center]: /images/20210724/76fade4f6ac74fde9c00c4f134e75074.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzI5NDU2MA_size_16_color_FFFFFF_t_70_pic_center 1]: /images/20210724/794d2845f410483a9a2644b8ee24db5d.png
[watermark_type_ZmFuZ3poZW5naGVpdGk_shadow_10_text_aHR0cHM6Ly9ibG9nLmNzZG4ubmV0L3dlaXhpbl80MzI5NDU2MA_size_16_color_FFFFFF_t_70_pic_center 2]: /images/20210724/2fbbe197960642fcbbd4de92bc877d40.png