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YouTube ProgressBar Preserver

It preserves YouTube's progress bar always visible even if the controls are hidden.

  1. // ==UserScript==
  2. // @name        YouTube ProgressBar Preserver
  3. // @name:ja     YouTube ProgressBar Preserver
  4. // @name:zh-CN  YouTube ProgressBar Preserver
  5. // @description It preserves YouTube's progress bar always visible even if the controls are hidden.
  6. // @description:ja YouTubeのプログレスバー(再生時刻の割合を示す赤いバー)を、隠さず常に表示させるようにします。
  7. // @description:zh-CN 让你恒常地显示油管上的进度条(显示播放时间比例的红色条)。
  8. // @namespace   knoa.jp
  9. // @include     https://www.youtube.com/*
  10. // @include     https://www.youtube-nocookie.com/embed/*
  11. // @exclude     https://www.youtube.com/live_chat*
  12. // @exclude     https://www.youtube.com/live_chat_replay*
  13. // @version     1.0.2
  14. // @grant       none
  15. // ==/UserScript==
  16.  
  17. (function(){
  18.   const SCRIPTID = 'YouTubeProgressBarPreserver';
  19.   const SCRIPTNAME = 'YouTube ProgressBar Preserver';
  20.   const DEBUG = false;/*
  21. [update]
  22. No updates on code. Just confirmed to work.
  23.  
  24. [bug]
  25.  
  26. [todo]
  27.  
  28. [research]
  29. timeupdateの間隔ぶんだけ遅れてしまうのはうまく改善できるかどうか
  30. timeupdateきっかけで250ms(前回との差？)をキープするような仕組みでいける？
  31. もっとも、時間の短い広告時くらいしか知覚できないけど。
  32.  
  33. [memo]
  34. YouTubeによって隠されているときはオリジナルのバーは更新されないので、独自に作るほうがラク。
  35. 0.9完成後、youtube progressbar で検索したところすでに存在していることを発見＼(^o^)／
  36. https://addons.mozilla.org/ja/firefox/addon/progress-bar-for-youtube/
  37. カスタマイズできるが、生放送に対応していない。プログレスが最低0.5秒単位でtransitionもない。
  38.   */
  39.   if(window === top && console.time) console.time(SCRIPTID);
  40.   const MS = 1, SECOND = 1000*MS, MINUTE = 60*SECOND, HOUR = 60*MINUTE, DAY = 24*HOUR, WEEK = 7*DAY, MONTH = 30*DAY, YEAR = 365*DAY;
  41.   const INTERVAL = 1*SECOND;/*for core.checkUrl*/
  42.   const SHORTDURATION = 4*MINUTE / 1000;/*short video should have transition*/
  43.   const STARTSWITH = [/*for core.checkUrl*/
  44.     'https://www.youtube.com/watch?',
  45.     'https://www.youtube.com/embed/',
  46.     'https://www.youtube-nocookie.com/embed/',
  47.   ];
  48.   let site = {
  49.     targets: {
  50.       player: () => $('.html5-video-player'),
  51.       video: () => $('video[src]'),
  52.       time: () => $('.ytp-time-display'),
  53.     },
  54.     is: {
  55.       live: (time) => time.classList.contains('ytp-live'),
  56.     },
  57.   };
  58.   let elements = {}, timers = {};
  59.   let core = {
  60.     initialize: function(){
  61.       elements.html = document.documentElement;
  62.       elements.html.classList.add(SCRIPTID);
  63.       core.checkUrl();
  64.       core.addStyle();
  65.     },
  66.     checkUrl: function(){
  67.       let previousUrl = '';
  68.       timers.checkUrl = setInterval(function(){
  69.         if(document.hidden) return;
  70.         /* The page is visible, so... */
  71.         if(location.href === previousUrl) return;
  72.         else previousUrl = location.href;
  73.         /* The URL has changed, so... */
  74.         if(STARTSWITH.some(url => location.href.startsWith(url)) === false) return;
  75.         /* This page should be modified, so... */
  76.         core.ready();
  77.       }, INTERVAL);
  78.     },
  79.     ready: function(){
  80.       core.getTargets(site.targets).then(() => {
  81.         log("I'm ready.");
  82.         core.appendBar();
  83.         core.observeTime();
  84.         core.observeVideo();
  85.       }).catch(e => {
  86.         console.error(`${SCRIPTID}:${e.lineNumber} ${e.name}: ${e.message}`);
  87.       });
  88.     },
  89.     appendBar: function(){
  90.       if(elements.bar && elements.bar.isConnected) return;
  91.       let bar = elements.bar = createElement(html.bar());
  92.       let progress = elements.progress = bar.firstElementChild;
  93.       let buffer = elements.buffer = bar.lastElementChild;
  94.       elements.player.appendChild(bar);
  95.     },
  96.     observeTime: function(){
  97.       /* detect live for hiding the bar */
  98.       let time = elements.time, bar = elements.bar;
  99.       let detect = function(time, bar){
  100.         if(site.is.live(time)) bar.classList.remove('active');
  101.         else bar.classList.add('active');
  102.       };
  103.       detect(time, bar);
  104.       if(time.isObservingAttributes) return;
  105.       time.isObservingAttributes = true;
  106.       let observer = observe(time, function(records){
  107.         detect(time, bar);
  108.       }, {attributes: true});
  109.     },
  110.     observeVideo: function(){
  111.       let video = elements.video, progress = elements.progress, buffer = elements.buffer;
  112.       if(video.isObservingForProgressBar) return;
  113.       video.isObservingForProgressBar = true;
  114.       if(video.duration < SHORTDURATION) progress.classList.add('transition');
  115.       progress.style.transform = 'scaleX(0)';
  116.       video.addEventListener('durationchange', function(e){
  117.         if(video.duration < SHORTDURATION) progress.classList.add('transition');
  118.         else progress.classList.remove('transition');
  119.       });
  120.       video.addEventListener('timeupdate', function(e){
  121.         progress.style.transform = `scaleX(${video.currentTime / video.duration})`;
  122.       });
  123.       let renderBuffer = function(e){
  124.         for(let i = video.buffered.length - 1; 0 <= i; i--){
  125.           if(video.currentTime < video.buffered.start(i)) continue;
  126.           buffer.style.transform = `scaleX(${video.buffered.end(i) / video.duration})`;
  127.           break;
  128.         }
  129.       };
  130.       video.addEventListener('progress', renderBuffer);
  131.       video.addEventListener('seeking', renderBuffer);
  132.     },
  133.     getTarget: function(selector, retry = 10, interval = 1*SECOND){
  134.       const key = selector.name;
  135.       const get = function(resolve, reject){
  136.         let selected = selector();
  137.         if(selected && selected.length > 0) selected.forEach((s) => s.dataset.selector = key);/* elements */
  138.         else if(selected instanceof HTMLElement) selected.dataset.selector = key;/* element */
  139.         else if(--retry) return log(`Not found: ${key}, retrying... (${retry})`), setTimeout(get, interval, resolve, reject);
  140.         else return reject(new Error(`Not found: ${selector.name}, I give up.`));
  141.         elements[key] = selected;
  142.         resolve(selected);
  143.       };
  144.       return new Promise(function(resolve, reject){
  145.         get(resolve, reject);
  146.       });
  147.     },
  148.     getTargets: function(selectors, retry = 10, interval = 1*SECOND){
  149.       return Promise.all(Object.values(selectors).map(selector => core.getTarget(selector, retry, interval)));
  150.     },
  151.     addStyle: function(name = 'style'){
  152.       if(html[name] === undefined) return;
  153.       let style = createElement(html[name]());
  154.       document.head.appendChild(style);
  155.       if(elements[name] && elements[name].isConnected) document.head.removeChild(elements[name]);
  156.       elements[name] = style;
  157.     },
  158.   };
  159.   const html = {
  160.     bar: () => `<div id="${SCRIPTID}-bar"><div id="${SCRIPTID}-progress"></div><div id="${SCRIPTID}-buffer"></div></div>`,
  161.     style: () => `
  162.       <style type="text/css">
  163.         /* preserved bar */
  164.         #${SCRIPTID}-bar{
  165.           --height: 3px;
  166.           --background: rgba(255,255,255,.2);
  167.           --filter: drop-shadow(0px 0px calc(var(--height)/2) rgba(0,0,0,.5));
  168.           --color: #f00;
  169.           --ad-color: #fc0;
  170.           --buffer-color: rgba(255,255,255,.4);
  171.           --transition-bar: opacity .25s cubic-bezier(0.0,0.0,0.2,1);
  172.           --transition-progress: transform .25s linear;
  173.           --z-index: 100;
  174.         }
  175.         #${SCRIPTID}-bar{
  176.           width: 100%;
  177.           height: var(--height);
  178.           background: var(--background);
  179.           position: absolute;
  180.           bottom: 0;
  181.           transition: var(--transition-bar);
  182.           opacity: 0;
  183.           z-index: var(--z-index);
  184.         }
  185.         #${SCRIPTID}-progress,
  186.         #${SCRIPTID}-buffer{
  187.           width: 100%;
  188.           height: var(--height);
  189.           transform-origin: 0 0;
  190.           position: absolute;
  191.         }
  192.         #${SCRIPTID}-progress.transition,
  193.         #${SCRIPTID}-buffer{
  194.           transition: var(--transition-progress);
  195.         }
  196.         #${SCRIPTID}-progress{
  197.           background: var(--color);
  198.           filter: var(--filter);
  199.           z-index: 1;
  200.         }
  201.         #${SCRIPTID}-buffer{
  202.           background: var(--buffer-color);
  203.         }
  204.         .ad-interrupting/*advertisement*/ #${SCRIPTID}-progress{
  205.           background: var(--ad-color);
  206.         }
  207.         /* replace the original bar */
  208.         .ytp-autohide #${SCRIPTID}-bar.active{
  209.           opacity: 1;
  210.         }
  211.         /* replace the bar for an ad */
  212.         .ytp-ad-persistent-progress-bar-container/*YouTube offers progress bar only when an ad is showing, but it doesn't have transition animation*/{
  213.           display: none
  214.         }
  215.       </style>
  216.     `,
  217.   };
  218.   const setTimeout = window.setTimeout.bind(window), clearTimeout = window.clearTimeout.bind(window), setInterval = window.setInterval.bind(window), clearInterval = window.clearInterval.bind(window), requestAnimationFrame = window.requestAnimationFrame.bind(window);
  219.   const alert = window.alert.bind(window), confirm = window.confirm.bind(window), getComputedStyle = window.getComputedStyle.bind(window), fetch = window.fetch.bind(window);
  220.   if(!('isConnected' in Node.prototype)) Object.defineProperty(Node.prototype, 'isConnected', {get: function(){return document.contains(this)}});
  221.   const $ = function(s, f){
  222.     let target = document.querySelector(s);
  223.     if(target === null) return null;
  224.     return f ? f(target) : target;
  225.   };
  226.   const $$ = function(s, f){
  227.     let targets = document.querySelectorAll(s);
  228.     return f ? Array.from(targets).map(t => f(t)) : targets;
  229.   };
  230.   const createElement = function(html = '<span></span>'){
  231.     let outer = document.createElement('div');
  232.     outer.innerHTML = html;
  233.     return outer.firstElementChild;
  234.   };
  235.   const observe = function(element, callback, options = {childList: true, attributes: false, characterData: false, subtree: false}){
  236.     let observer = new MutationObserver(callback.bind(element));
  237.     observer.observe(element, options);
  238.     return observer;
  239.   };
  240.   const log = function(){
  241.     if(!DEBUG) return;
  242.     let l = log.last = log.now || new Date(), n = log.now = new Date();
  243.     let error = new Error(), line = log.format.getLine(error), callers = log.format.getCallers(error);
  244.     //console.log(error.stack);
  245.     console.log(
  246.       (SCRIPTID || '') + ':',
  247.       /* 00:00:00.000  */ n.toLocaleTimeString() + '.' + n.getTime().toString().slice(-3),
  248.       /* +0.000s       */ '+' + ((n-l)/1000).toFixed(3) + 's',
  249.       /* :00           */ ':' + line,
  250.       /* caller.caller */ (callers[2] ? callers[2] + '() => ' : '') +
  251.       /* caller        */ (callers[1] || '') + '()',
  252.       ...arguments
  253.     );
  254.   };
  255.   log.formats = [{
  256.       name: 'Firefox Scratchpad',
  257.       detector: /MARKER@Scratchpad/,
  258.       getLine: (e) => e.stack.split('\n')[1].match(/([0-9]+):[0-9]+$/)[1],
  259.       getCallers: (e) => e.stack.match(/^[^@]*(?=@)/gm),
  260.     }, {
  261.       name: 'Firefox Console',
  262.       detector: /MARKER@debugger/,
  263.       getLine: (e) => e.stack.split('\n')[1].match(/([0-9]+):[0-9]+$/)[1],
  264.       getCallers: (e) => e.stack.match(/^[^@]*(?=@)/gm),
  265.     }, {
  266.       name: 'Firefox Greasemonkey 3',
  267.       detector: /\/gm_scripts\//,
  268.       getLine: (e) => e.stack.split('\n')[1].match(/([0-9]+):[0-9]+$/)[1],
  269.       getCallers: (e) => e.stack.match(/^[^@]*(?=@)/gm),
  270.     }, {
  271.       name: 'Firefox Greasemonkey 4+',
  272.       detector: /MARKER@user-script:/,
  273.       getLine: (e) => e.stack.split('\n')[1].match(/([0-9]+):[0-9]+$/)[1] - 500,
  274.       getCallers: (e) => e.stack.match(/^[^@]*(?=@)/gm),
  275.     }, {
  276.       name: 'Firefox Tampermonkey',
  277.       detector: /MARKER@moz-extension:/,
  278.       getLine: (e) => e.stack.split('\n')[1].match(/([0-9]+):[0-9]+$/)[1] - 6,
  279.       getCallers: (e) => e.stack.match(/^[^@]*(?=@)/gm),
  280.     }, {
  281.       name: 'Chrome Console',
  282.       detector: /at MARKER \(<anonymous>/,
  283.       getLine: (e) => e.stack.split('\n')[2].match(/([0-9]+):[0-9]+\)?$/)[1],
  284.       getCallers: (e) => e.stack.match(/[^ ]+(?= \(<anonymous>)/gm),
  285.     }, {
  286.       name: 'Chrome Tampermonkey',
  287.       detector: /at MARKER \(chrome-extension:.*?\/userscript.html\?id=/,
  288.       getLine: (e) => e.stack.split('\n')[2].match(/([0-9]+):[0-9]+\)?$/)[1] - 6,
  289.       getCallers: (e) => e.stack.match(/[^ ]+(?= \(chrome-extension:)/gm),
  290.     }, {
  291.       name: 'Chrome Extension',
  292.       detector: /at MARKER \(chrome-extension:/,
  293.       getLine: (e) => e.stack.split('\n')[2].match(/([0-9]+):[0-9]+\)?$/)[1],
  294.       getCallers: (e) => e.stack.match(/[^ ]+(?= \(chrome-extension:)/gm),
  295.     }, {
  296.       name: 'Edge Console',
  297.       detector: /at MARKER \(eval/,
  298.       getLine: (e) => e.stack.split('\n')[2].match(/([0-9]+):[0-9]+\)$/)[1],
  299.       getCallers: (e) => e.stack.match(/[^ ]+(?= \(eval)/gm),
  300.     }, {
  301.       name: 'Edge Tampermonkey',
  302.       detector: /at MARKER \(Function/,
  303.       getLine: (e) => e.stack.split('\n')[2].match(/([0-9]+):[0-9]+\)$/)[1] - 4,
  304.       getCallers: (e) => e.stack.match(/[^ ]+(?= \(Function)/gm),
  305.     }, {
  306.       name: 'Safari',
  307.       detector: /^MARKER$/m,
  308.       getLine: (e) => 0,/*e.lineが用意されているが最終呼び出し位置のみ*/
  309.       getCallers: (e) => e.stack.split('\n'),
  310.     }, {
  311.       name: 'Default',
  312.       detector: /./,
  313.       getLine: (e) => 0,
  314.       getCallers: (e) => [],
  315.     }];
  316.   log.format = log.formats.find(function MARKER(f){
  317.     if(!f.detector.test(new Error().stack)) return false;
  318.     //console.log('////', f.name, 'wants', 0/*line*/, '\n' + new Error().stack);
  319.     return true;
  320.   });
  321.   core.initialize();
  322.   if(window === top && console.timeEnd) console.timeEnd(SCRIPTID);
  323. })();