// 获取视频加载进度
videoProgress(e){
       var bf = this.$refs.videoPlayer.buffered;  
       var time = this.$refs.videoPlayer.currentTime;
       if ( bf.length != 0 ){
           var range = 0;
           while( !( bf.start(range) <= time && time <= bf.end(range) ) ) {
               range += 1;
           }
           var loadEndPercentage = ( bf.end(range) / this.playerVideo.duration ) * 100;  // 结束加载的百分比
           this.persentLoad = loadEndPercentage;
       }
},

<template>
    <video 
      ref="videoPlayer" 
      @progress="videoProgress($event)"
      @timeupdate="videoTimeUpdate()"
    >
      您的浏览器不支持video
    </video>

    // 视频播放、加载进度条
    <ProgressLine 
      :presentT="presentT" 
      :totalT="totalT" 
      :persentLoad="persentLoad" 
      @changeCurrentTime="changeCurrentTime($event)"
      @changeCurrentWord="changeCurrentWord($event)"
    >
    </ProgressLine>

    // 播放时长、视频总时长
    <p>
      <span id="currentTime" ref="progressTimer">{{ videoCurrentTime }}</span>
      <span style="color: #ffffff;opacity: 0.3;">&nbsp;/&nbsp;</span>
      <span id="durationTime" ref="durationTimer">{{ videoTotalTime }}</span>
    </p>
</template>

import ProgressLine from './ProgressLine.vue';
export default {
    name: 'videoPage',
    components: {
        ProgressLine
    },
    data(){
        return{
            presentT: 0,  // 进度条的当前值，必须为number
            totalT: 0,    // 进度条的最大值，必须为number
            persentLoad: 0, // 视频加载进度 
            videoCurrentTime: '00:00', // 当前视频已播放时长
            videoTotalTime: '00:00',  // 视频总时长
        }
    },
    methods:{
        // 子组件传入的时间修改
        changeCurrentTime(data) {
            this.$refs.videoPlayer.currentTime = data;  // 点击进度条设置视频当前播放点
        },
        changeCurrentWord(data) {
            this.videoCurrentTime = this.formatTime(data);  // 当前播放时间显示文字
        },
        // 获取视频加载进度
        videoProgress(e){
            var bf = this.playerVideo.buffered;  
            var time = this.playerVideo.currentTime;
            if ( bf.length != 0 ){
                var range = 0;
                while( !( bf.start(range) <= time && time <= bf.end(range) ) ) {
                    range += 1; 
                }
                
                var loadEndPercentage = ( bf.end(range) / this.playerVideo.duration ) * 100;    // 结束加载的百分比
                this.persentLoad = loadEndPercentage;
            }
        },
        // 视频自动播放时
        videoTimeUpdate(){
            this.presentT = this.playerVideo.currentTime;   // 获取当前播放时长
            this.videoCurrentTime = this.formatTime(this.presentT);  // 时间格式化
        },
        // 时间格式化
        formatTime(t) {
            var m = parseInt(t % 3600 / 60)
            m = m < 10 ? '0' + m : m
            var s = parseInt(t % 60)
            s = s < 10 ? '0' + s : s
            return m + ':' + s
        },
    }
}

// ProgressLine.vue 进度条组件
<template>
    <div>
        <div class="line-background">
            <div class="time-line" @click="adjustProgress($event)">
                <div class="progress-round" ref="progressRound">
                    <div class="loading" ref="persentLoad" style="width: 0;"></div>   <!-- 加载进度条 -->
                    <div class="progress" ref="progress" @click="adjustProgress"></div>
                    <div class="round" ref="round" @mousedown="roundDrag"></div>
                </div>
            </div>
        </div>
    </div>
</template>
<script>
export default {
    name: 'ProgressLine',
    props: {
        presentT: {},
        totalT: {},
        persentLoad: { default : 0 }
    },
    data() {
        return {
            // 进度条拖拽
            dragClick: false,
            // 鼠标/手指按下
            clickDown: false,
        }
    },
    created() {

    },
    watch: {
        // 侦听当前播放时长设置进度条
        presentT: {
            handler(newValue, oldValue) {
                // 未点击进度条
                if (this.dragClick == false && this.clickDown == false) {
                    this.$refs.progress.style.width = newValue / this.totalT * 100 + '%'
                    if ((newValue / this.totalT * 100 - 1.23) < 0) {
                        this.$refs.round.style.left = 0 + '%'
                    } else {
                        this.$refs.round.style.left = (newValue / this.totalT * 100) - 1.23 + '%'
                    }
                } else if (this.dragClick == true) {
                    this.dealWidth()
                    this.dragClick = false
                }
            }
        },
        persentLoad: {
            handler(newValue, oldValue) {
                this.$refs.persentLoad.style.width = ( newValue / 100 ) * 1300 + 'px'; 
            }
        }
    },
    methods: {
        progressData(data) {
            this.$emit('changeCurrentTime', data)
            this.$emit('changeCurrentWord', data)
        },
        // 进度条位置和圆点定位处理
        dealWidth() {
            this.$refs.progress.style.width = this.progressWidth / this.$refs.progressRound.offsetWidth * 100 + '%'
            if ((this.progressWidth / this.$refs.progressRound.offsetWidth * 100) - 1.23 < 0) {  // 圆点定位
                this.$refs.round.style.left = 0 + '%'
            } else {
                this.$refs.round.style.left = (this.progressWidth / this.$refs.progressRound.offsetWidth * 100) - 1.23 + '%'
            }
        },
        // 进度条点击
        adjustProgress(e) {
            this.dragClick = true
            e.preventDefault()
            const { left, width } = this.$refs.progressRound.getBoundingClientRect()  // 进度条到屏幕距离及进度条的宽度
            this.progressWidth = e.clientX - left
            if (this.progressWidth < 0) {//进度条边界值计算情况
                this.progressWidth = 0
            } else if (this.progressWidth >= width) {
                this.progressWidth = width
            } else {
                this.progressWidth = e.clientX - left // e.clientX：鼠标点击的位置到屏幕最左侧的距离
            }
            this.dealWidth()
            this.progressData((this.progressWidth / width) * this.totalT)
        },
        // 进度条圆点拖拽
        roundDrag(event) {
            event.preventDefault()
            const offsetX = event.offsetX
            this.dragClick = true
            this.clickDown = true  // 解决圆点拖拽进度条长度抖动
            document.onmousemove = (e) => {  // 给圆点添加移动事件
                e.preventDefault()// 阻止进度条拖拽时屏幕原有的滑动功能
                const X = e.clientX  // 获取圆点离屏幕的距离
                const { left, width } = this.$refs.progressRound.getBoundingClientRect()
                const ml = X - left  // 进度条长度：圆点离屏幕的距离减去进度条最左边离屏幕的距离
                if (ml <= 0) {  // 进度条长度最小和最大值的界定
                    this.progressWidth = 0
                } else if (ml >= width) {
                    this.progressWidth = width
                } else {
                    this.progressWidth = ml
                }
                this.progressData((this.progressWidth / width) * this.totalT)  //视频播放时间
                this.dealWidth()
            }
            // 抬起鼠标，结束移动事件
            document.onmouseup = () => {
                document.onmousemove = null
                document.onmouseup = null
                this.clickDown = false
            }
        },
    }
}
</script>
<style lang="less" scoped>
.line-background {
    width: 100%;
    height: 10px;
    background-color: rgba(255, 255, 255, 0.3);

    .time-line {
        width: 100%;
        height: 10px;
        background-color: #565651;

        .progress-round {
            cursor: pointer;
            width: 100%;
            position: relative;
            display: flex;

            .loading {
                height: 10px;
                background-color: rgba(255, 255, 255, 0.3);
            }

            .progress {
                position: absolute;
                top: 0;
                left: 0;
                width: 00%;
                height: 10px;
                background-color: #3d7eff;
            }

            .round {
                position: absolute;
                top: 50%;
                left: 0;
                transform: translateY(-50%);
                width: 16px;
                height: 16px;
                border-radius: 16px;
                background: #ffffff;
                box-shadow: -2px 0px 2px 2px rgba(3, 0, 0, 0.30);
            }
        }
    }
}
</style>

// 在视频中禁用右键（禁止用户下载）
contextmenu(e){
    e.returnValue = false;
},