It preserves YouTube's progress bar always visible even if the controls are hidden.
// ==UserScript==
// @name YouTube ProgressBar Preserver
// @name:ja YouTube ProgressBar Preserver
// @name:zh-CN YouTube ProgressBar Preserver
// @description It preserves YouTube's progress bar always visible even if the controls are hidden.
// @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。
// @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)。
// @namespace knoa.jp
// @include https://www.youtube.com/*
// @include https://www.youtube-nocookie.com/embed/*
// @exclude https://www.youtube.com/live_chat*
// @exclude https://www.youtube.com/live_chat_replay*
// @version 1.0.2
// @grant none
// ==/UserScript==
(function(){
const SCRIPTID = 'YouTubeProgressBarPreserver';
const SCRIPTNAME = 'YouTube ProgressBar Preserver';
const DEBUG = false;/*
[update]
No updates on code. Just confirmed to work.
[bug]
[todo]
[research]
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
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？
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。
[memo]
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。
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^)／
https://addons.mozilla.org/ja/firefox/addon/progress-bar-for-youtube/
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。
*/
if(window === top && console.time) console.time(SCRIPTID);
const MS = 1, SECOND = 1000*MS, MINUTE = 60*SECOND, HOUR = 60*MINUTE, DAY = 24*HOUR, WEEK = 7*DAY, MONTH = 30*DAY, YEAR = 365*DAY;
const INTERVAL = 1*SECOND;/*for core.checkUrl*/
const SHORTDURATION = 4*MINUTE / 1000;/*short video should have transition*/
const STARTSWITH = [/*for core.checkUrl*/
'https://www.youtube.com/watch?',
'https://www.youtube.com/embed/',
'https://www.youtube-nocookie.com/embed/',
];
let site = {
targets: {
player: () => $('.html5-video-player'),
video: () => $('video[src]'),
time: () => $('.ytp-time-display'),
},
is: {
live: (time) => time.classList.contains('ytp-live'),
},
};
let elements = {}, timers = {};
let core = {
initialize: function(){
elements.html = document.documentElement;
elements.html.classList.add(SCRIPTID);
core.checkUrl();
core.addStyle();
},
checkUrl: function(){
let previousUrl = '';
timers.checkUrl = setInterval(function(){
if(document.hidden) return;
/* The page is visible, so... */
if(location.href === previousUrl) return;
else previousUrl = location.href;
/* The URL has changed, so... */
if(STARTSWITH.some(url => location.href.startsWith(url)) === false) return;
/* This page should be modified, so... */
core.ready();
}, INTERVAL);
},
ready: function(){
core.getTargets(site.targets).then(() => {
log("I'm ready.");
core.appendBar();
core.observeTime();
core.observeVideo();
}).catch(e => {
console.error(`${SCRIPTID}:${e.lineNumber} ${e.name}: ${e.message}`);
});
},
appendBar: function(){
if(elements.bar && elements.bar.isConnected) return;
let bar = elements.bar = createElement(html.bar());
let progress = elements.progress = bar.firstElementChild;
let buffer = elements.buffer = bar.lastElementChild;
elements.player.appendChild(bar);
},
observeTime: function(){
/* detect live for hiding the bar */
let time = elements.time, bar = elements.bar;
let detect = function(time, bar){
if(site.is.live(time)) bar.classList.remove('active');
else bar.classList.add('active');
};
detect(time, bar);
if(time.isObservingAttributes) return;
time.isObservingAttributes = true;
let observer = observe(time, function(records){
detect(time, bar);
}, {attributes: true});
},
observeVideo: function(){
let video = elements.video, progress = elements.progress, buffer = elements.buffer;
if(video.isObservingForProgressBar) return;
video.isObservingForProgressBar = true;
if(video.duration < SHORTDURATION) progress.classList.add('transition');
progress.style.transform = 'scaleX(0)';
video.addEventListener('durationchange', function(e){
if(video.duration < SHORTDURATION) progress.classList.add('transition');
else progress.classList.remove('transition');
});
video.addEventListener('timeupdate', function(e){
progress.style.transform = `scaleX(${video.currentTime / video.duration})`;
});
let renderBuffer = function(e){
for(let i = video.buffered.length - 1; 0 <= i; i--){
if(video.currentTime < video.buffered.start(i)) continue;
buffer.style.transform = `scaleX(${video.buffered.end(i) / video.duration})`;
break;
}
};
video.addEventListener('progress', renderBuffer);
video.addEventListener('seeking', renderBuffer);
},
getTarget: function(selector, retry = 10, interval = 1*SECOND){
const key = selector.name;
const get = function(resolve, reject){
let selected = selector();
if(selected && selected.length > 0) selected.forEach((s) => s.dataset.selector = key);/* elements */
else if(selected instanceof HTMLElement) selected.dataset.selector = key;/* element */
else if(--retry) return log(`Not found: ${key}, retrying... (${retry})`), setTimeout(get, interval, resolve, reject);
else return reject(new Error(`Not found: ${selector.name}, I give up.`));
elements[key] = selected;
resolve(selected);
};
return new Promise(function(resolve, reject){
get(resolve, reject);
});
},
getTargets: function(selectors, retry = 10, interval = 1*SECOND){
return Promise.all(Object.values(selectors).map(selector => core.getTarget(selector, retry, interval)));
},
addStyle: function(name = 'style'){
if(html[name] === undefined) return;
let style = createElement(html[name]());
document.head.appendChild(style);
if(elements[name] && elements[name].isConnected) document.head.removeChild(elements[name]);
elements[name] = style;
},
};
const html = {
bar: () => `<div id="${SCRIPTID}-bar"><div id="${SCRIPTID}-progress"></div><div id="${SCRIPTID}-buffer"></div></div>`,
style: () => `
<style type="text/css">
/* preserved bar */
#${SCRIPTID}-bar{
--height: 3px;
--background: rgba(255,255,255,.2);
--filter: drop-shadow(0px 0px calc(var(--height)/2) rgba(0,0,0,.5));
--color: #f00;
--ad-color: #fc0;
--buffer-color: rgba(255,255,255,.4);
--transition-bar: opacity .25s cubic-bezier(0.0,0.0,0.2,1);
--transition-progress: transform .25s linear;
--z-index: 100;
}
#${SCRIPTID}-bar{
width: 100%;
height: var(--height);
background: var(--background);
position: absolute;
bottom: 0;
transition: var(--transition-bar);
opacity: 0;
z-index: var(--z-index);
}
#${SCRIPTID}-progress,
#${SCRIPTID}-buffer{
width: 100%;
height: var(--height);
transform-origin: 0 0;
position: absolute;
}
#${SCRIPTID}-progress.transition,
#${SCRIPTID}-buffer{
transition: var(--transition-progress);
}
#${SCRIPTID}-progress{
background: var(--color);
filter: var(--filter);
z-index: 1;
}
#${SCRIPTID}-buffer{
background: var(--buffer-color);
}
.ad-interrupting/*advertisement*/ #${SCRIPTID}-progress{
background: var(--ad-color);
}
/* replace the original bar */
.ytp-autohide #${SCRIPTID}-bar.active{
opacity: 1;
}
/* replace the bar for an ad */
.ytp-ad-persistent-progress-bar-container/*YouTube offers progress bar only when an ad is showing, but it doesn't have transition animation*/{
display: none
}
</style>
`,
};
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);
const alert = window.alert.bind(window), confirm = window.confirm.bind(window), getComputedStyle = window.getComputedStyle.bind(window), fetch = window.fetch.bind(window);
if(!('isConnected' in Node.prototype)) Object.defineProperty(Node.prototype, 'isConnected', {get: function(){return document.contains(this)}});
const $ = function(s, f){
let target = document.querySelector(s);
if(target === null) return null;
return f ? f(target) : target;
};
const $$ = function(s, f){
let targets = document.querySelectorAll(s);
return f ? Array.from(targets).map(t => f(t)) : targets;
};
const createElement = function(html = '<span></span>'){
let outer = document.createElement('div');
outer.innerHTML = html;
return outer.firstElementChild;
};
const observe = function(element, callback, options = {childList: true, attributes: false, characterData: false, subtree: false}){
let observer = new MutationObserver(callback.bind(element));
observer.observe(element, options);
return observer;
};
const log = function(){
if(!DEBUG) return;
let l = log.last = log.now || new Date(), n = log.now = new Date();
let error = new Error(), line = log.format.getLine(error), callers = log.format.getCallers(error);
//console.log(error.stack);
console.log(
(SCRIPTID || '') + ':',
/* 00:00:00.000 */ n.toLocaleTimeString() + '.' + n.getTime().toString().slice(-3),
/* +0.000s */ '+' + ((n-l)/1000).toFixed(3) + 's',
/* :00 */ ':' + line,
/* caller.caller */ (callers[2] ? callers[2] + '() => ' : '') +
/* caller */ (callers[1] || '') + '()',
...arguments
);
};
log.formats = [{
name: 'Firefox Scratchpad',
detector: /MARKER@Scratchpad/,
getLine: (e) => e.stack.split('\n')[1].match(/([0-9]+):[0-9]+$/)[1],
getCallers: (e) => e.stack.match(/^[^@]*(?=@)/gm),
}, {
name: 'Firefox Console',
detector: /MARKER@debugger/,
getLine: (e) => e.stack.split('\n')[1].match(/([0-9]+):[0-9]+$/)[1],
getCallers: (e) => e.stack.match(/^[^@]*(?=@)/gm),
}, {
name: 'Firefox Greasemonkey 3',
detector: /\/gm_scripts\//,
getLine: (e) => e.stack.split('\n')[1].match(/([0-9]+):[0-9]+$/)[1],
getCallers: (e) => e.stack.match(/^[^@]*(?=@)/gm),
}, {
name: 'Firefox Greasemonkey 4+',
detector: /MARKER@user-script:/,
getLine: (e) => e.stack.split('\n')[1].match(/([0-9]+):[0-9]+$/)[1] - 500,
getCallers: (e) => e.stack.match(/^[^@]*(?=@)/gm),
}, {
name: 'Firefox Tampermonkey',
detector: /MARKER@moz-extension:/,
getLine: (e) => e.stack.split('\n')[1].match(/([0-9]+):[0-9]+$/)[1] - 6,
getCallers: (e) => e.stack.match(/^[^@]*(?=@)/gm),
}, {
name: 'Chrome Console',
detector: /at MARKER \(<anonymous>/,
getLine: (e) => e.stack.split('\n')[2].match(/([0-9]+):[0-9]+\)?$/)[1],
getCallers: (e) => e.stack.match(/[^ ]+(?= \(<anonymous>)/gm),
}, {
name: 'Chrome Tampermonkey',
detector: /at MARKER \(chrome-extension:.*?\/userscript.html\?id=/,
getLine: (e) => e.stack.split('\n')[2].match(/([0-9]+):[0-9]+\)?$/)[1] - 6,
getCallers: (e) => e.stack.match(/[^ ]+(?= \(chrome-extension:)/gm),
}, {
name: 'Chrome Extension',
detector: /at MARKER \(chrome-extension:/,
getLine: (e) => e.stack.split('\n')[2].match(/([0-9]+):[0-9]+\)?$/)[1],
getCallers: (e) => e.stack.match(/[^ ]+(?= \(chrome-extension:)/gm),
}, {
name: 'Edge Console',
detector: /at MARKER \(eval/,
getLine: (e) => e.stack.split('\n')[2].match(/([0-9]+):[0-9]+\)$/)[1],
getCallers: (e) => e.stack.match(/[^ ]+(?= \(eval)/gm),
}, {
name: 'Edge Tampermonkey',
detector: /at MARKER \(Function/,
getLine: (e) => e.stack.split('\n')[2].match(/([0-9]+):[0-9]+\)$/)[1] - 4,
getCallers: (e) => e.stack.match(/[^ ]+(?= \(Function)/gm),
}, {
name: 'Safari',
detector: /^MARKER$/m,
getLine: (e) => 0,/*e.lineが用意されているが最終呼び出し位置のみ*/
getCallers: (e) => e.stack.split('\n'),
}, {
name: 'Default',
detector: /./,
getLine: (e) => 0,
getCallers: (e) => [],
}];
log.format = log.formats.find(function MARKER(f){
if(!f.detector.test(new Error().stack)) return false;
//console.log('////', f.name, 'wants', 0/*line*/, '\n' + new Error().stack);
return true;
});
core.initialize();
if(window === top && console.timeEnd) console.timeEnd(SCRIPTID);
})();