mirror of
https://github.com/zhw2590582/ArtPlayer.git
synced 2026-10-24 23:51:20 -08:00
719 lines
25 KiB
JavaScript
719 lines
25 KiB
JavaScript
import { bilibiliDanmuParseFromUrl } from './bilibili';
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import workerText from 'bundle-text:./worker';
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export default class Danmuku {
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constructor(art, option) {
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const { constructor, template } = art;
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this.utils = constructor.utils; // 工具库
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this.validator = constructor.validator; // 配置校验器
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this.$danmuku = template.$danmuku; // 弹幕层容器
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this.$player = template.$player; // 播放器容器
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this.art = art;
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this.queue = []; // 实际弹幕队列
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this.$refs = []; // 弹幕DOM节点池
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this.isStop = false; // 是否停止
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this.isHide = false; // 是否隐藏
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this.timer = null; // 定时器
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this.index = 0; // 弹幕索引
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// 格式化后的配置项
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this.option = Danmuku.option;
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// 弹幕状态池
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this.states = { wait: [], ready: [], emit: [], stop: [] };
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// 初始化配置
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this.config(option);
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// 创建 Web Worker, 用于计算弹幕的 top 值
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const blob = new Blob([workerText], { type: 'application/javascript' });
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this.worker = new Worker(URL.createObjectURL(blob));
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// 绑定公用事件
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this.start = this.start.bind(this);
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this.stop = this.stop.bind(this);
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this.reset = this.reset.bind(this);
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this.resize = this.resize.bind(this);
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this.destroy = this.destroy.bind(this);
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// 监听事件
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art.on('video:play', this.start);
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art.on('video:playing', this.start);
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art.on('video:pause', this.stop);
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art.on('video:waiting', this.stop);
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art.on('destroy', this.destroy);
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art.on('resize', this.resize);
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// 开始加载弹幕
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this.load();
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}
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// 默认配置
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static get option() {
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return {
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danmuku: [], // 弹幕数据
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speed: 5, // 弹幕持续时间，范围在[1 ~ 10]
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margin: [10, '25%'], // 弹幕上下边距，支持像素数字和百分比
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opacity: 1, // 弹幕透明度，范围在[0 ~ 1]
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color: '#FFFFFF', // 默认弹幕颜色，可以被单独弹幕项覆盖
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mode: 0, // 默认弹幕模式: 0: 滚动，1: 顶部，2: 底部
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modes: [0, 1, 2], // 弹幕可见的模式
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fontSize: 25, // 弹幕字体大小，支持像素数字和百分比
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antiOverlap: true, // 弹幕是否防重叠
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synchronousPlayback: false, // 是否同步播放速度
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mount: undefined, // 弹幕发射器挂载点, 默认为播放器控制栏中部
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heatmap: false, // 是否开启热力图
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width: 512, // 当播放器宽度小于此值时，弹幕发射器置于播放器底部
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points: [], // 热力图数据
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filter: () => true, // 弹幕载入前的过滤器，只支持返回布尔值
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beforeEmit: () => true, // 弹幕发送前的过滤器，支持返回 Promise
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beforeVisible: () => true, // 弹幕显示前的过滤器，支持返回 Promise
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visible: true, // 弹幕层是否可见
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emitter: true, // 是否开启弹幕发射器
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maxLength: 200, // 弹幕输入框最大长度, 范围在[1 ~ 1000]
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lockTime: 5, // 输入框锁定时间，范围在[1 ~ 60]
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theme: 'dark', // 弹幕主题，支持 dark 和 light，只在自定义挂载时生效
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OPACITY: {}, // 不透明度配置项
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FONT_SIZE: {}, // 弹幕字号配置项
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MARGIN: {}, // 显示区域配置项
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SPEED: {}, // 弹幕速度配置项
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COLOR: [], // 颜色列表配置项
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};
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}
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// 配置校验
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static get scheme() {
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return {
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danmuku: 'array|function|string',
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speed: 'number',
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margin: 'array',
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opacity: 'number',
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color: 'string',
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mode: 'number',
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modes: 'array',
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fontSize: 'number|string',
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antiOverlap: 'boolean',
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synchronousPlayback: 'boolean',
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mount: '?htmldivelement|string',
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heatmap: 'object|boolean',
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width: 'number',
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points: 'array',
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filter: 'function',
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beforeEmit: 'function',
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beforeVisible: 'function',
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visible: 'boolean',
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emitter: 'boolean',
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maxLength: 'number',
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lockTime: 'number',
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theme: 'string',
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OPACITY: 'object',
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FONT_SIZE: 'object',
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MARGIN: 'object',
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SPEED: 'object',
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COLOR: 'array',
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};
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}
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// 初始弹幕样式
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static get cssText() {
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return `
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user-select: none;
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position: absolute;
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white-space: pre;
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pointer-events: none;
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perspective: 500px;
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display: inline-block;
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will-change: transform;
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font-weight: normal;
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line-height: 1.125;
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visibility: hidden;
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font-family: SimHei, "Microsoft JhengHei", Arial, Helvetica, sans-serif;
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text-shadow: rgb(0, 0, 0) 1px 0px 1px, rgb(0, 0, 0) 0px 1px 1px, rgb(0, 0, 0) 0px -1px 1px, rgb(0, 0, 0) -1px 0px 1px;
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`;
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}
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// 是否在移动端使用了自动旋屏，会影响弹幕的left和top值
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get isRotate() {
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return this.art.plugins?.autoOrientation?.state;
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}
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// 计算上空白边距
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get marginTop() {
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const { clamp } = this.utils;
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const value = this.option.margin[0];
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const { clientHeight } = this.$player;
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if (typeof value === 'number') {
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return clamp(value, 0, clientHeight);
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}
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if (typeof value === 'string' && value.endsWith('%')) {
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const ratio = parseFloat(value) / 100;
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return clamp(clientHeight * ratio, 0, clientHeight);
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}
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return Danmuku.option.margin[0];
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}
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// 计算下空白边距
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get marginBottom() {
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const { clamp } = this.utils;
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const value = this.option.margin[1];
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const { clientHeight } = this.$player;
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if (typeof value === 'number') {
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return clamp(value, 0, clientHeight);
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}
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if (typeof value === 'string' && value.endsWith('%')) {
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const ratio = parseFloat(value) / 100;
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return clamp(clientHeight * ratio, 0, clientHeight);
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}
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return Danmuku.option.margin[1];
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}
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// 计算弹幕字体大小
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get fontSize() {
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const { clamp } = this.utils;
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const { clientHeight } = this.$player;
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const fontSize = this.option.fontSize;
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if (typeof fontSize === 'number') {
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return Math.round(clamp(fontSize, 12, clientHeight));
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}
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if (typeof fontSize === 'string' && fontSize.endsWith('%')) {
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const ratio = parseFloat(fontSize) / 100;
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return Math.round(clamp(clientHeight * ratio, 12, clientHeight));
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}
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return Danmuku.option.fontSize;
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}
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// 获取弹幕DOM节点
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get $ref() {
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const $ref = this.$refs.pop() || document.createElement('div');
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$ref.style.cssText = Danmuku.cssText;
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$ref.dataset.mode = '';
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$ref.className = '';
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return $ref;
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}
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// 获取准备好发送的弹幕
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get readys() {
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const { currentTime } = this.art;
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const result = [];
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// 有的是ready状态：之前因为弹幕太多而暂停发送的弹幕
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this.filter('ready', (danmu) => result.push(danmu));
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// 有的是wait状态：符合时间范围的弹幕
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this.filter('wait', (danmu) => {
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if (currentTime + 0.1 >= danmu.time && danmu.time >= currentTime - 0.1) {
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result.push(danmu);
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}
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});
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return result;
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}
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// 可见的弹幕的数据，用于计算下一个弹幕的top值
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get visibles() {
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const result = [];
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const { clientWidth } = this.$player;
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const clientLeft = this.getLeft(this.$player);
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this.filter('emit', (danmu) => {
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const top = danmu.$ref.offsetTop;
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const left = this.getLeft(danmu.$ref) - clientLeft;
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const height = danmu.$ref.clientHeight;
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const width = danmu.$ref.clientWidth;
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const distance = left + width;
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const right = clientWidth - distance;
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const speed = distance / danmu.$restTime;
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const emit = {};
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emit.top = top;
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emit.left = left;
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emit.height = height;
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emit.width = width;
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emit.right = right;
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emit.speed = speed;
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emit.distance = distance;
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emit.time = danmu.$restTime;
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emit.mode = danmu.mode;
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result.push(emit);
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});
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return result;
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}
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// 计算弹幕速度
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get speed() {
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return this.option.synchronousPlayback && this.art.playbackRate
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? this.option.speed / Number(this.art.playbackRate)
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: this.option.speed;
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}
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// 加载弹幕
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async load(danmuku) {
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const { errorHandle } = this.utils;
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let danmus = [];
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const target = danmuku || this.option.danmuku;
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try {
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if (typeof target === 'function') {
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danmus = await target(); // 异步函数获取
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} else if (target instanceof Promise) {
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danmus = await target; // 从 Promise 对象获取
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} else if (typeof target === 'string') {
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danmus = await bilibiliDanmuParseFromUrl(target); // 从B站xml链接解析
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} else if (Array.isArray(target)) {
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danmus = target; // 直接传入数组
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}
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errorHandle(Array.isArray(danmus), 'Danmuku need return an array as result');
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// 假如没有传入弹幕参数，则清空弹幕，否则追加弹幕
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if (danmuku === undefined) {
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this.reset(); // 重置弹幕
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this.queue = []; // 清空弹幕队列
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this.states = { wait: [], ready: [], emit: [], stop: [] }; // 清空弹幕状态池
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this.$refs = []; // 清空弹幕DOM节点池
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this.$danmuku.innerText = ''; // 清空弹幕层
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}
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// 逐个验证原始弹幕并转换到弹幕队列
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for (let index = 0; index < danmus.length; index++) {
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const danmu = danmus[index];
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await this.emit(danmu);
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}
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this.art.emit('artplayerPluginDanmuku:loaded', this.queue);
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} catch (error) {
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this.art.emit('artplayerPluginDanmuku:error', error);
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throw error;
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}
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return this;
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}
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// 把原始弹幕转换到弹幕队列
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async emit(danmu) {
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const { clamp } = this.utils;
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this.validator(danmu, {
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text: 'string', // 弹幕文本
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mode: '?number', // 弹幕模式: 0: 滚动，1: 顶部，2: 底部
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color: '?string', // 弹幕颜色
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time: '?number', // 弹幕时间
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border: '?boolean', // 弹幕是否有边框
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style: '?object', // 弹幕额外样式
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});
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// 弹幕文本为空则直接忽略
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if (!danmu.text.trim()) return this;
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// 设置弹幕时间，如果没有则默认为当前时间加 0.5 秒
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if (danmu.time) {
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danmu.time = clamp(danmu.time, 0, Infinity);
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} else {
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danmu.time = this.art.currentTime + 0.5;
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}
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// 设置弹幕模式，如果没有则默认为全局配置
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if (danmu.mode === undefined) {
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danmu.mode = this.option.mode;
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}
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// 设置弹幕单独样式，如果没有则默认为空对象
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if (danmu.style === undefined) {
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danmu.style = {};
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}
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// 设置弹幕颜色，如果没有则默认为全局配置
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if (danmu.color === undefined) {
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danmu.color = this.option.color;
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}
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// 弹幕模式只能是 0, 1, 2
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if (![0, 1, 2].includes(danmu.mode)) return this;
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// 自定义弹幕过滤函数
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if (!this.option.filter(danmu)) return this;
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// 添加自定义属性
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const item = {
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...danmu,
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$state: 'wait', // 弹幕初始状态
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$id: this.index++, // 弹幕唯一标识
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$ref: null, // 弹幕 DOM 节点
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$restTime: 0, // 弹幕剩余时间
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$lastStartTime: 0, // 弹幕上次开始时间
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};
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// 转换为wait状态
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this.setState(item, 'wait');
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// 添加到实际弹幕队列
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this.queue.push(item);
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// 弹幕有四个状态：
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// - wait: 弹幕还未开始显示，没有被添加到 DOM 中
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// - ready: 弹幕准备好显示，没有被添加到 DOM 中
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// - emit: 弹幕正在显示，已经被添加到 DOM 中
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// - stop: 弹幕正在停止显示，已经被添加到 DOM 中
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return this;
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}
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// 动态配置
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config(option) {
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const { clamp } = this.utils;
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const { $controlsCenter } = this.art.template;
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// 判断配置项是否有变化
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const changed = Object.keys(option).some(
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(key) => JSON.stringify(this.option[key]) !== JSON.stringify(option[key]),
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);
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// 没有变化则直接返回
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if (!changed) return this;
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// 更新配置项
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this.option = Object.assign({}, Danmuku.option, this.option, option);
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this.validator(this.option, Danmuku.scheme);
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this.option.mode = clamp(this.option.mode, 0, 2);
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this.option.speed = clamp(this.option.speed, 1, 10);
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this.option.opacity = clamp(this.option.opacity, 0, 1);
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this.option.lockTime = clamp(this.option.lockTime, 1, 60);
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this.option.maxLength = clamp(this.option.maxLength, 1, 1000);
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this.option.mount = this.option.mount || $controlsCenter;
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// 动态配置有字体大小，需要重新渲染
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if (option.fontSize) {
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this.reset();
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}
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// 通过配置项控制弹幕的显示和隐藏
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if (this.option.visible) {
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this.show();
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} else {
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this.hide();
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}
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this.art.emit('artplayerPluginDanmuku:config', this.option);
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return this;
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}
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// 计算DOM的left值，受到旋屏影响
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getLeft($ref) {
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const rect = $ref.getBoundingClientRect();
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return this.isRotate ? rect.top : rect.left;
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}
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// 复杂运算交给 Web Worker 处理
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postMessage(message = {}) {
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return new Promise((resolve) => {
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message.id = Date.now(); // 生成唯一标识
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this.worker.postMessage(message);
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this.worker.onmessage = (event) => {
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const { data } = event;
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// 判断是否是当前的消息
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if (data.id === message.id) {
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resolve(data);
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}
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};
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});
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}
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// 根据状态获取弹幕
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filter(state, callback) {
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const danmus = this.states[state] || [];
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for (let index = 0; index < danmus.length; index++) {
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callback(danmus[index]);
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}
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return danmus;
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}
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// 设置弹幕状态
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setState(danmu, state) {
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// 从原状态池中删除
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this.states[danmu.$state] = this.states[danmu.$state].filter((item) => item !== danmu);
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// 设置新状态
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danmu.$state = state;
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// 设置DOM节点状态
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if (danmu.$ref) {
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danmu.$ref.dataset.state = state;
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}
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// 添加到新状态池中
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this.states[state].push(danmu);
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}
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// 重置弹幕到wait状态，回收弹幕DOM节点
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makeWait(danmu) {
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this.setState(danmu, 'wait');
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if (danmu.$ref) {
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danmu.$ref.style.cssText = Danmuku.cssText;
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danmu.$ref.style.visibility = 'hidden';
|
|
danmu.$ref.style.marginLeft = '0px';
|
|
danmu.$ref.style.transform = 'translateX(0px)';
|
|
danmu.$ref.style.transition = 'transform 0s linear 0s';
|
|
this.$refs.push(danmu.$ref);
|
|
danmu.$ref = null;
|
|
}
|
|
}
|
|
|
|
// 实时更新弹幕
|
|
update() {
|
|
const { setStyles } = this.utils;
|
|
|
|
this.timer = window.requestAnimationFrame(async () => {
|
|
if (this.art.playing && !this.isHide) {
|
|
// 实时计算弹幕的剩余显示时间
|
|
this.filter('emit', (danmu) => {
|
|
const emitTime = (Date.now() - danmu.$lastStartTime) / 1000;
|
|
danmu.$restTime -= emitTime;
|
|
danmu.$lastStartTime = Date.now();
|
|
// 超过时间即重置弹幕
|
|
if (danmu.$restTime <= 0) {
|
|
this.makeWait(danmu);
|
|
}
|
|
});
|
|
|
|
// 获取准备好发送的弹幕，可能包含ready和wait状态的弹幕
|
|
const readys = this.readys;
|
|
|
|
for (let index = 0; index < readys.length; index++) {
|
|
const danmu = readys[index];
|
|
|
|
// 弹幕发送前的过滤器
|
|
const state = await this.option.beforeVisible(danmu);
|
|
|
|
if (state) {
|
|
const { clientWidth, clientHeight } = this.$player;
|
|
danmu.$ref = this.$ref; // 获取弹幕DOM节点
|
|
danmu.$ref.innerText = danmu.text; // 设置弹幕文本
|
|
|
|
// 提前添加到弹幕层中，用于计算top值
|
|
this.$danmuku.appendChild(danmu.$ref);
|
|
|
|
// 设置初始弹幕样式
|
|
danmu.$ref.style.opacity = this.option.opacity;
|
|
danmu.$ref.style.fontSize = `${this.fontSize}px`;
|
|
danmu.$ref.style.color = danmu.color;
|
|
danmu.$ref.style.border = danmu.border ? `1px solid ${danmu.color}` : null;
|
|
danmu.$ref.style.backgroundColor = danmu.border ? 'rgb(0 0 0 / 50%)' : null;
|
|
|
|
// 设置单独弹幕样式
|
|
setStyles(danmu.$ref, danmu.style);
|
|
|
|
// 记录弹幕时间戳
|
|
danmu.$lastStartTime = Date.now();
|
|
|
|
// 计算弹幕剩余时间
|
|
danmu.$restTime = this.speed;
|
|
|
|
// 计算弹幕滚动的距离
|
|
const distance = clientWidth + danmu.$ref.clientWidth;
|
|
|
|
// 计算弹幕的top值
|
|
const { result: top } = await this.postMessage({
|
|
type: 'getDanmuTop',
|
|
target: {
|
|
mode: danmu.mode,
|
|
height: danmu.$ref.clientHeight,
|
|
speed: distance / danmu.$restTime,
|
|
}, // 当前弹幕信息
|
|
visibles: this.visibles, // 可见的弹幕的数据
|
|
antiOverlap: this.option.antiOverlap,
|
|
clientWidth: clientWidth,
|
|
clientHeight: clientHeight,
|
|
marginBottom: this.marginBottom,
|
|
marginTop: this.marginTop,
|
|
});
|
|
|
|
if (danmu.$ref) {
|
|
if (!this.isStop && top !== undefined) {
|
|
this.setState(danmu, 'emit'); // 转换为emit状态
|
|
danmu.$ref.style.top = `${top}px`;
|
|
danmu.$ref.style.visibility = 'visible';
|
|
danmu.$ref.dataset.mode = danmu.mode; // CSS控制模式的显示和隐藏
|
|
|
|
switch (danmu.mode) {
|
|
// 滚动的弹幕
|
|
case 0: {
|
|
danmu.$ref.style.left = `${clientWidth}px`;
|
|
danmu.$ref.style.marginLeft = '0px';
|
|
danmu.$ref.style.transform = `translateX(${-distance}px)`;
|
|
danmu.$ref.style.transition = `transform ${danmu.$restTime}s linear 0s`;
|
|
break;
|
|
}
|
|
case 1:
|
|
// falls through
|
|
case 2:
|
|
danmu.$ref.style.left = '50%';
|
|
danmu.$ref.style.marginLeft = `-${danmu.$ref.clientWidth / 2}px`;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
|
|
this.art.emit('artplayerPluginDanmuku:visible', danmu);
|
|
} else {
|
|
// 假如弹幕已经停止或者没有 top 值，则重置弹幕为ready状态，回收弹幕DOM节点，等待下次发送
|
|
this.setState(danmu, 'ready');
|
|
this.$refs.push(danmu.$ref);
|
|
danmu.$ref = null;
|
|
}
|
|
}
|
|
}
|
|
}
|
|
}
|
|
|
|
// 递归调用
|
|
if (!this.isStop) {
|
|
this.update();
|
|
}
|
|
});
|
|
return this;
|
|
}
|
|
|
|
// 重置正在显示的弹幕: stop/emit 状态的弹幕
|
|
resize() {
|
|
const { clientWidth } = this.$player;
|
|
|
|
this.filter('stop', (danmu) => {
|
|
switch (danmu.mode) {
|
|
// 滚动的弹幕
|
|
case 0:
|
|
danmu.$ref.style.left = `${clientWidth}px`;
|
|
break;
|
|
default:
|
|
break;
|
|
}
|
|
});
|
|
|
|
this.filter('emit', (danmu) => {
|
|
danmu.$lastStartTime = Date.now();
|
|
switch (danmu.mode) {
|
|
// 滚动的弹幕
|
|
case 0: {
|
|
const distance = clientWidth + danmu.$ref.clientWidth;
|
|
danmu.$ref.style.left = `${clientWidth}px`;
|
|
danmu.$ref.style.transform = `translateX(${-distance}px)`;
|
|
danmu.$ref.style.transition = `transform ${danmu.$restTime}s linear 0s`;
|
|
break;
|
|
}
|
|
default:
|
|
break;
|
|
}
|
|
});
|
|
}
|
|
|
|
// 继续弹幕
|
|
continue() {
|
|
const { clientWidth } = this.$player;
|
|
this.filter('stop', (danmu) => {
|
|
this.setState(danmu, 'emit'); // 转换为emit状态
|
|
danmu.$lastStartTime = Date.now();
|
|
switch (danmu.mode) {
|
|
// 继续滚动的弹幕
|
|
case 0: {
|
|
const distance = clientWidth + danmu.$ref.clientWidth;
|
|
danmu.$ref.style.transform = `translateX(${-distance}px)`;
|
|
danmu.$ref.style.transition = `transform ${danmu.$restTime}s linear 0s`;
|
|
break;
|
|
}
|
|
default:
|
|
break;
|
|
}
|
|
});
|
|
|
|
return this;
|
|
}
|
|
|
|
// 暂停弹幕
|
|
suspend() {
|
|
const { clientWidth } = this.$player;
|
|
this.filter('emit', (danmu) => {
|
|
this.setState(danmu, 'stop'); // 转换为stop状态
|
|
switch (danmu.mode) {
|
|
// 停止滚动的弹幕
|
|
case 0: {
|
|
const translateX = clientWidth - (this.getLeft(danmu.$ref) - this.getLeft(this.$player));
|
|
danmu.$ref.style.transform = `translateX(${-translateX}px)`;
|
|
danmu.$ref.style.transition = 'transform 0s linear 0s';
|
|
break;
|
|
}
|
|
default:
|
|
break;
|
|
}
|
|
});
|
|
|
|
return this;
|
|
}
|
|
|
|
stop() {
|
|
this.isStop = true;
|
|
this.suspend();
|
|
window.cancelAnimationFrame(this.timer);
|
|
this.art.emit('artplayerPluginDanmuku:stop');
|
|
return this;
|
|
}
|
|
|
|
start() {
|
|
this.isStop = false;
|
|
this.continue();
|
|
this.update();
|
|
this.art.emit('artplayerPluginDanmuku:start');
|
|
return this;
|
|
}
|
|
|
|
reset() {
|
|
this.queue.forEach((danmu) => this.makeWait(danmu));
|
|
this.art.emit('artplayerPluginDanmuku:reset');
|
|
return this;
|
|
}
|
|
|
|
show() {
|
|
this.isHide = false;
|
|
this.$danmuku.style.opacity = 1;
|
|
this.option.visible = true;
|
|
this.art.emit('artplayerPluginDanmuku:show');
|
|
return this;
|
|
}
|
|
|
|
hide() {
|
|
this.isHide = true;
|
|
this.$danmuku.style.opacity = 0;
|
|
this.option.visible = false;
|
|
this.art.emit('artplayerPluginDanmuku:hide');
|
|
return this;
|
|
}
|
|
|
|
destroy() {
|
|
this.stop();
|
|
this.worker.terminate();
|
|
this.art.off('video:play', this.start);
|
|
this.art.off('video:playing', this.start);
|
|
this.art.off('video:pause', this.stop);
|
|
this.art.off('video:waiting', this.stop);
|
|
this.art.off('resize', this.reset);
|
|
this.art.off('destroy', this.destroy);
|
|
this.art.emit('artplayerPluginDanmuku:destroy');
|
|
}
|
|
}
|