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YouTube ProgressBar Preserver

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)。

当前为 2020-06-14 提交的版本，查看 最新版本。

  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     1.0.0
  14. // @grant       none
  15. // ==/UserScript==
  16.  
  17. (function(){
  18.   const SCRIPTID = 'YouTubeProgressBarPreserver';
  19.   const SCRIPTNAME = 'YouTube ProgressBar Preserver';
  20.   const DEBUG = false;/*
  21. [update] 1.0.0
  22. Added slight shadow for better visibility.
  23.  
  24. [bug]
  25. buffered.end(0) エラー？
  26.  
  27. [todo]
  28.  
  29. [research]
  30. 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
  31. 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？
  32. 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。
  33.  
  34. [memo]
  35. 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。
  36. 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^)／
  37. https://addons.mozilla.org/ja/firefox/addon/progress-bar-for-youtube/
  38. 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。
  39.   */
  40.   if(window === top && console.time) console.time(SCRIPTID);
  41.   const MS = 1, SECOND = 1000*MS, MINUTE = 60*SECOND, HOUR = 60*MINUTE, DAY = 24*HOUR, WEEK = 7*DAY, MONTH = 30*DAY, YEAR = 365*DAY;
  42.   const INTERVAL = 1*SECOND;/*for core.checkUrl*/
  43.   const SHORTDURATION = 4*MINUTE / 1000;/*short video should have transition*/
  44.   const STARTSWITH = [/*for core.checkUrl*/
  45.     'https://www.youtube.com/watch?',
  46.     'https://www.youtube.com/embed/',
  47.     'https://www.youtube-nocookie.com/embed/',
  48.   ];
  49.   let site = {
  50.     targets: {
  51.       player: () => $('.html5-video-player'),
  52.       video: () => $('video[src]'),
  53.       time: () => $('.ytp-time-display'),
  54.     },
  55.     is: {
  56.       live: (time) => time.classList.contains('ytp-live'),
  57.     },
  58.   };
  59.   let elements = {}, timers = {};
  60.   let core = {
  61.     initialize: function(){
  62.       elements.html = document.documentElement;
  63.       elements.html.classList.add(SCRIPTID);
  64.       core.checkUrl();
  65.       core.addStyle();
  66.     },
  67.     checkUrl: function(){
  68.       let previousUrl = '';
  69.       timers.checkUrl = setInterval(function(){
  70.         if(document.hidden) return;
  71.         /* The page is visible, so... */
  72.         if(location.href === previousUrl) return;
  73.         else previousUrl = location.href;
  74.         /* The URL has changed, so... */
  75.         if(STARTSWITH.some(url => location.href.startsWith(url)) === false) return;
  76.         /* This page should be modified, so... */
  77.         core.ready();
  78.       }, INTERVAL);
  79.     },
  80.     ready: function(){
  81.       core.getTargets(site.targets).then(() => {
  82.         log("I'm ready.");
  83.         core.appendBar();
  84.         core.observeTime();
  85.         core.observeVideo();
  86.       }).catch(e => {
  87.         console.error(`${SCRIPTID}:${e.lineNumber} ${e.name}: ${e.message}`);
  88.       });
  89.     },
  90.     appendBar: function(){
  91.       if(elements.bar && elements.bar.isConnected) return;
  92.       let bar = elements.bar = createElement(html.bar());
  93.       let progress = elements.progress = bar.firstElementChild;
  94.       let buffer = elements.buffer = bar.lastElementChild;
  95.       elements.player.appendChild(bar);
  96.     },
  97.     observeTime: function(){
  98.       /* detect live for hiding the bar */
  99.       let time = elements.time, bar = elements.bar;
  100.       let detect = function(time, bar){
  101.         if(site.is.live(time)) bar.classList.remove('active');
  102.         else bar.classList.add('active');
  103.       };
  104.       detect(time, bar);
  105.       if(time.isObservingAttributes) return;
  106.       time.isObservingAttributes = true;
  107.       let observer = observe(time, function(records){
  108.         detect(time, bar);
  109.       }, {attributes: true});
  110.     },
  111.     observeVideo: function(){
  112.       let video = elements.video, progress = elements.progress, buffer = elements.buffer;
  113.       if(video.isObservingForProgressBar) return;
  114.       video.isObservingForProgressBar = true;
  115.       if(video.duration < SHORTDURATION) progress.classList.add('transition');
  116.       progress.style.transform = 'scaleX(0)';
  117.       video.addEventListener('durationchange', function(e){
  118.         if(video.duration < SHORTDURATION) progress.classList.add('transition');
  119.         else progress.classList.remove('transition');
  120.       });
  121.       video.addEventListener('timeupdate', function(e){
  122.         progress.style.transform = `scaleX(${video.currentTime / video.duration})`;
  123.       });
  124.       video.addEventListener('progress', function(e){
  125.         for(let i = video.buffered.length - 1; 0 <= i; i--){
  126.           if(video.currentTime < video.buffered.start(i)) continue;
  127.           buffer.style.transform = `scaleX(${video.buffered.end(i) / video.duration})`;
  128.           break;
  129.         }
  130.       });
  131.       video.addEventListener('seeking', function(e){
  132.         if(video.buffered.end(0) === video.duration) return;
  133.         buffer.style.transform = `scaleX(0)`;
  134.       });
  135.     },
  136.     getTarget: function(selector, retry = 10, interval = 1*SECOND){
  137.       const key = selector.name;
  138.       const get = function(resolve, reject){
  139.         let selected = selector();
  140.         if(selected && selected.length > 0) selected.forEach((s) => s.dataset.selector = key);/* elements */
  141.         else if(selected instanceof HTMLElement) selected.dataset.selector = key;/* element */
  142.         else if(--retry) return log(`Not found: ${key}, retrying... (${retry})`), setTimeout(get, interval, resolve, reject);
  143.         else return reject(new Error(`Not found: ${selector.name}, I give up.`));
  144.         elements[key] = selected;
  145.         resolve(selected);
  146.       };
  147.       return new Promise(function(resolve, reject){
  148.         get(resolve, reject);
  149.       });
  150.     },
  151.     getTargets: function(selectors, retry = 10, interval = 1*SECOND){
  152.       return Promise.all(Object.values(selectors).map(selector => core.getTarget(selector, retry, interval)));
  153.     },
  154.     addStyle: function(name = 'style'){
  155.       if(html[name] === undefined) return;
  156.       let style = createElement(html[name]());
  157.       document.head.appendChild(style);
  158.       if(elements[name] && elements[name].isConnected) document.head.removeChild(elements[name]);
  159.       elements[name] = style;
  160.     },
  161.   };
  162.   const html = {
  163.     bar: () => `<div id="${SCRIPTID}-bar"><div id="${SCRIPTID}-progress"></div><div id="${SCRIPTID}-buffer"></div></div>`,
  164.     style: () => `
  165.       <style type="text/css">
  166.         /* preserved bar */
  167.         #${SCRIPTID}-bar{
  168.           --height: 3px;
  169.           --background: rgba(255,255,255,.2);
  170.           --filter: drop-shadow(0px 0px var(--height) rgba(0,0,0,.5));
  171.           --color: #f00;
  172.           --ad-color: #fc0;
  173.           --buffer-color: rgba(255,255,255,.4);
  174.           --transition-bar: opacity .25s cubic-bezier(0.0,0.0,0.2,1);
  175.           --transition-progress: transform .25s linear;
  176.           --z-index: 100;
  177.         }
  178.         #${SCRIPTID}-bar{
  179.           width: 100%;
  180.           height: var(--height);
  181.           background: var(--background);
  182.           position: absolute;
  183.           bottom: 0;
  184.           transition: var(--transition-bar);
  185.           opacity: 0;
  186.           z-index: var(--z-index);
  187.         }
  188.         #${SCRIPTID}-progress,
  189.         #${SCRIPTID}-buffer{
  190.           width: 100%;
  191.           height: var(--height);
  192.           transform-origin: 0 0;
  193.           position: absolute;
  194.         }
  195.         #${SCRIPTID}-progress.transition,
  196.         #${SCRIPTID}-buffer{
  197.           transition: var(--transition-progress);
  198.         }
  199.         #${SCRIPTID}-progress{
  200.           background: var(--color);
  201.           filter: var(--filter);
  202.           z-index: 1;
  203.         }
  204.         #${SCRIPTID}-buffer{
  205.           background: var(--buffer-color);
  206.         }
  207.         .ad-interrupting/*advertisement*/ #${SCRIPTID}-progress{
  208.           background: var(--ad-color);
  209.         }
  210.         /* replace the original bar */
  211.         .ytp-autohide #${SCRIPTID}-bar.active{
  212.           opacity: 1;
  213.         }
  214.         /* replace the bar for an ad */
  215.         .ytp-ad-persistent-progress-bar-container/*YouTube offers progress bar only when an ad is showing, but it doesn't have transition animation*/{
  216.           display: none
  217.         }
  218.       </style>
  219.     `,
  220.   };
  221.   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);
  222.   const alert = window.alert.bind(window), confirm = window.confirm.bind(window), getComputedStyle = window.getComputedStyle.bind(window), fetch = window.fetch.bind(window);
  223.   if(!('isConnected' in Node.prototype)) Object.defineProperty(Node.prototype, 'isConnected', {get: function(){return document.contains(this)}});
  224.   const $ = function(s, f){
  225.     let target = document.querySelector(s);
  226.     if(target === null) return null;
  227.     return f ? f(target) : target;
  228.   };
  229.   const $$ = function(s, f){
  230.     let targets = document.querySelectorAll(s);
  231.     return f ? Array.from(targets).map(t => f(t)) : targets;
  232.   };
  233.   const createElement = function(html = '<span></span>'){
  234.     let outer = document.createElement('div');
  235.     outer.innerHTML = html;
  236.     return outer.firstElementChild;
  237.   };
  238.   const observe = function(element, callback, options = {childList: true, attributes: false, characterData: false, subtree: false}){
  239.     let observer = new MutationObserver(callback.bind(element));
  240.     observer.observe(element, options);
  241.     return observer;
  242.   };
  243.   const log = function(){
  244.     if(!DEBUG) return;
  245.     let l = log.last = log.now || new Date(), n = log.now = new Date();
  246.     let error = new Error(), line = log.format.getLine(error), callers = log.format.getCallers(error);
  247.     //console.log(error.stack);
  248.     console.log(
  249.       (SCRIPTID || '') + ':',
  250.       /* 00:00:00.000  */ n.toLocaleTimeString() + '.' + n.getTime().toString().slice(-3),
  251.       /* +0.000s       */ '+' + ((n-l)/1000).toFixed(3) + 's',
  252.       /* :00           */ ':' + line,
  253.       /* caller.caller */ (callers[2] ? callers[2] + '() => ' : '') +
  254.       /* caller        */ (callers[1] || '') + '()',
  255.       ...arguments
  256.     );
  257.   };
  258.   log.formats = [{
  259.       name: 'Firefox Scratchpad',
  260.       detector: /MARKER@Scratchpad/,
  261.       getLine: (e) => e.stack.split('\n')[1].match(/([0-9]+):[0-9]+$/)[1],
  262.       getCallers: (e) => e.stack.match(/^[^@]*(?=@)/gm),
  263.     }, {
  264.       name: 'Firefox Console',
  265.       detector: /MARKER@debugger/,
  266.       getLine: (e) => e.stack.split('\n')[1].match(/([0-9]+):[0-9]+$/)[1],
  267.       getCallers: (e) => e.stack.match(/^[^@]*(?=@)/gm),
  268.     }, {
  269.       name: 'Firefox Greasemonkey 3',
  270.       detector: /\/gm_scripts\//,
  271.       getLine: (e) => e.stack.split('\n')[1].match(/([0-9]+):[0-9]+$/)[1],
  272.       getCallers: (e) => e.stack.match(/^[^@]*(?=@)/gm),
  273.     }, {
  274.       name: 'Firefox Greasemonkey 4+',
  275.       detector: /MARKER@user-script:/,
  276.       getLine: (e) => e.stack.split('\n')[1].match(/([0-9]+):[0-9]+$/)[1] - 500,
  277.       getCallers: (e) => e.stack.match(/^[^@]*(?=@)/gm),
  278.     }, {
  279.       name: 'Firefox Tampermonkey',
  280.       detector: /MARKER@moz-extension:/,
  281.       getLine: (e) => e.stack.split('\n')[1].match(/([0-9]+):[0-9]+$/)[1] - 6,
  282.       getCallers: (e) => e.stack.match(/^[^@]*(?=@)/gm),
  283.     }, {
  284.       name: 'Chrome Console',
  285.       detector: /at MARKER \(<anonymous>/,
  286.       getLine: (e) => e.stack.split('\n')[2].match(/([0-9]+):[0-9]+\)?$/)[1],
  287.       getCallers: (e) => e.stack.match(/[^ ]+(?= \(<anonymous>)/gm),
  288.     }, {
  289.       name: 'Chrome Tampermonkey',
  290.       detector: /at MARKER \(chrome-extension:.*?\/userscript.html\?id=/,
  291.       getLine: (e) => e.stack.split('\n')[2].match(/([0-9]+):[0-9]+\)?$/)[1] - 6,
  292.       getCallers: (e) => e.stack.match(/[^ ]+(?= \(chrome-extension:)/gm),
  293.     }, {
  294.       name: 'Chrome Extension',
  295.       detector: /at MARKER \(chrome-extension:/,
  296.       getLine: (e) => e.stack.split('\n')[2].match(/([0-9]+):[0-9]+\)?$/)[1],
  297.       getCallers: (e) => e.stack.match(/[^ ]+(?= \(chrome-extension:)/gm),
  298.     }, {
  299.       name: 'Edge Console',
  300.       detector: /at MARKER \(eval/,
  301.       getLine: (e) => e.stack.split('\n')[2].match(/([0-9]+):[0-9]+\)$/)[1],
  302.       getCallers: (e) => e.stack.match(/[^ ]+(?= \(eval)/gm),
  303.     }, {
  304.       name: 'Edge Tampermonkey',
  305.       detector: /at MARKER \(Function/,
  306.       getLine: (e) => e.stack.split('\n')[2].match(/([0-9]+):[0-9]+\)$/)[1] - 4,
  307.       getCallers: (e) => e.stack.match(/[^ ]+(?= \(Function)/gm),
  308.     }, {
  309.       name: 'Safari',
  310.       detector: /^MARKER$/m,
  311.       getLine: (e) => 0,/*e.lineが用意されているが最終呼び出し位置のみ*/
  312.       getCallers: (e) => e.stack.split('\n'),
  313.     }, {
  314.       name: 'Default',
  315.       detector: /./,
  316.       getLine: (e) => 0,
  317.       getCallers: (e) => [],
  318.     }];
  319.   log.format = log.formats.find(function MARKER(f){
  320.     if(!f.detector.test(new Error().stack)) return false;
  321.     //console.log('////', f.name, 'wants', 0/*line*/, '\n' + new Error().stack);
  322.     return true;
  323.   });
  324.   core.initialize();
  325.   if(window === top && console.timeEnd) console.timeEnd(SCRIPTID);
  326. })();