import {get as getBrowserGlobals} from 'app/client/lib/browserGlobals'; import {waitObs} from 'app/common/gutil'; import {Disposable, dom, DomElementArg} from 'grainjs'; import ko from 'knockout'; export interface Player { playVideo(): void; pauseVideo(): void; stopVideo(): void; mute(): void; unMute(): void; setVolume(volume: number): void; getCurrentTime(): number; } export interface PlayerOptions { height?: string; width?: string; origin?: string; playerVars?: PlayerVars; onPlayerReady?(player: Player): void onPlayerStateChange?(player: Player, event: PlayerStateChangeEvent): void; } export interface PlayerVars { controls?: 0 | 1; disablekb?: 0 | 1; fs?: 0 | 1; iv_load_policy?: 1 | 3; modestbranding?: 0 | 1; } export interface PlayerStateChangeEvent { data: PlayerState; } export enum PlayerState { Unstarted = -1, Ended = 0, Playing = 1, Paused = 2, Buffering = 3, VideoCued = 5, } const G = getBrowserGlobals('document', 'window'); /** * Wrapper component for the YouTube IFrame Player API. * * Fetches the JavaScript code for the API if needed, and creates an iframe that * points to a YouTube video with the specified id. * * For more documentation, see https://developers.google.com/youtube/iframe_api_reference. */ export class YouTubePlayer extends Disposable { private _domArgs: DomElementArg[]; private _isLoading: ko.Observable = ko.observable(true); private _playerId = `youtube-player-${this._videoId}`; private _player: Player; constructor( private _videoId: string, private _options: PlayerOptions, ...domArgs: DomElementArg[] ) { super(); this._domArgs = domArgs; if (!G.window.YT) { const tag = document.createElement('script'); tag.src = 'https://www.youtube.com/iframe_api'; const firstScriptTag = document.getElementsByTagName('script')[0]; firstScriptTag?.parentNode?.insertBefore(tag, firstScriptTag); G.window.onYouTubeIframeAPIReady = () => this._handleYouTubeIframeAPIReady(); } else { setTimeout(() => this._handleYouTubeIframeAPIReady(), 0); } } public isLoading() { return this._isLoading(); } public isLoaded() { return waitObs(this._isLoading, (val) => !val); } public play() { this._player.playVideo(); } public setVolume(volume: number) { this._player.setVolume(volume); } public getCurrentTime(): number { return this._player.getCurrentTime(); } public buildDom() { return dom('div', {id: this._playerId}, ...this._domArgs); } private _handleYouTubeIframeAPIReady() { const {onPlayerReady, onPlayerStateChange, playerVars, ...otherOptions} = this._options; this._player = new G.window.YT.Player(this._playerId, { videoId: this._videoId, playerVars, events: { onReady: () => { this._isLoading(false); onPlayerReady?.(this._player); }, onStateChange: (event: PlayerStateChangeEvent) => onPlayerStateChange?.(this._player, event), }, ...otherOptions, }); } }