// ==UserScript==
// @name         YouTube Preview
// @author       sooqua
// @namespace    https://github.com/sooqua/
// @version      0.9
// @description  A userscript to play youtube videos by hovering over their thumbnails.
// @match        *://*.youtube.com/*
// @run-at       document-end
// @grant        none
// ==/UserScript==
var APIready = new Promise(function(resolve) {
window.onYouTubeIframeAPIReady = resolve;
});
(function() {
'use strict';
function init() {
// requesting api
var scriptTag = document.createElement('script');
scriptTag.src = "https://www.youtube.com/iframe_api";
var firstScriptTag = document.getElementsByTagName('script')[0];
firstScriptTag.parentNode.insertBefore(scriptTag, firstScriptTag);
addGlobalStyle(
".watch-sidebar-section { " +
"z-index: auto !important; " +
"} " +
".yt-lockup-thumbnail:not(.yt-pl-thumb),.thumb-wrapper { " +
"-webkit-transition: all 200ms ease-in !important; " +
"-webkit-transform: scale(1) !important; " +
"-moz-transition: all 200ms ease-in !important; " +
"-moz-transform: scale(1) !important; " +
"transition: all 200ms ease-in !important; " +
"transform: scale(1) !important; " +
"} " +
".yt-lockup-thumbnail:not(.yt-pl-thumb):hover,.thumb-wrapper:hover { " +
"z-index: 9999999999 !important; " +
"box-shadow: 0px 0px 100px #000000 !important; " +
"-webkit-transition: all 200ms ease-in !important; " +
"-webkit-transform: scale(2.0) !important; " +
"-moz-transition: all 200ms ease-in !important; " +
"-moz-transform: scale(2.0) !important; " +
"transition: all 200ms ease-in !important; " +
"transform: scale(2.0) !important; " +
"} " +
".yt-thumb.video-thumb, .yt-uix-simple-thumb-wrap.yt-uix-simple-thumb-related { " +
"background-color: black !important; " +
"} " +
".xspinner { " +
"pointer-events: none; " +
"position: absolute; " +
"top: 0; " +
"right: 0; " +
"bottom: 0; " +
"left: 0; " +
"background: rgba(255,255,255,0.5); " +
"font-size: 14px; " +
"text-align: center; " +
"line-height: 2; " +
"color: rgb(0,0,0); " +
"font-weight: bold; " +
"} ");
initOn(document);
var mo = new MutationObserver(function(muts) {
muts.forEach(function(mut) {
[].forEach.call(mut.addedNodes, function(node) {
if (node instanceof HTMLElement) {
initOn(node);
}
});
});
});
mo.observe(document.body, {childList: true, subtree: true});
}
function initOn(base) {
[].forEach.call(base.querySelectorAll('.yt-lockup-thumbnail:not(.yt-pl-thumb) a[href^="/watch"], .thumb-wrapper a[href^="/watch"]'), function(thumbnail) {
thumbnail.parentNode.addEventListener('mouseover', function() {
if(thumbnail.overlocker) return;
thumbnail.overlocker = new Promise(function (unlock) {
var rect = thumbnail.parentElement.getBoundingClientRect();
var farRight = (rect.right + thumbnail.parentElement.clientWidth/2.0) > window.innerWidth;
var farDown = (rect.bottom + thumbnail.parentElement.clientHeight/2.0) > window.innerHeight;
var farLeft = (rect.left - thumbnail.parentElement.clientWidth/2.0) < 0;
var farUp = (rect.top - thumbnail.parentElement.clientHeight/2.0) < 0;
if(farRight || farDown || farLeft || farUp) {
var transformOrig = (farRight ? 'right ':'') + (farDown ? 'bottom ':'') + (farLeft ? 'left ':'') + (farUp ? 'top ':'');
thumbnail.parentElement.style.webkitTransformOrigin = transformOrig;
thumbnail.parentElement.style.mozTransformOrigin = transformOrig;
thumbnail.parentElement.style.transformOrigin = transformOrig;
}
var spinner = document.createElement('div');
spinner.className = 'xspinner';
spinner.textContent = 'Loading...';
var childThumb = thumbnail.querySelector('.yt-thumb.video-thumb, .yt-uix-simple-thumb-wrap.yt-uix-simple-thumb-related');
childThumb.appendChild(spinner);
thumbnail.watchedContainer = [];
for (var el = thumbnail; el; el = el.parentElement) {
if (el.classList.contains('watched')) {
thumbnail.watchedContainer.push(el);
el.classList.remove('watched');
}
}
thumbnail.watchedBadgeContainer = [];
[].forEach.call(thumbnail.parentNode.querySelectorAll('.watched-badge'), function (watchedBadge) {
thumbnail.watchedBadgeContainer.push(watchedBadge);
watchedBadge.style.display = 'none';
});
thumbnail.imageContainer = [];
[].forEach.call(thumbnail.getElementsByTagName('img'), function(img) {
thumbnail.imageContainer.push(img);
img.style.opacity = 0;
});
var vidId = thumbnail.href.split('v=')[1];
thumbnail.PPlayer = new Promise(function (resolve) {
var playerTag = document.createElement('div');
playerTag.id = vidId;
playerTag.style.pointerEvents = 'none';
playerTag.style.position = 'absolute';
childThumb.insertBefore(playerTag, childThumb.firstChild);
APIready.then(function () {
var pplayer = new YT.Player(playerTag.id, {
width: childThumb.offsetWidth,
height: childThumb.offsetHeight,
videoId: vidId,
playerVars: {
'enablejsapi': 1, 'autoplay': 1, 'showinfo': 0, 'controls': 0,
'modestbranding': 1, 'ps': 'docs', 'iv_load_policy': 3, 'rel': 0,
'vq': 'medium'
},
events: {
'onReady': function() { resolve(pplayer); }
}
});
});
});
thumbnail.PPlayer.then(function () {
childThumb.removeChild(spinner);
unlock();
});
});
});
thumbnail.parentNode.addEventListener('mousemove', function(evt) {
if (thumbnail.spinner) return;
if(thumbnail.lastX !== evt.screenX) {
var offsetX = evt.offsetX || evt.layerX - thumbnail.offsetLeft;
if(thumbnail.PPlayer) {
thumbnail.PPlayer.then(function (PPlayer) {
try {
PPlayer.seekTo(PPlayer.getDuration() * offsetX / thumbnail.parentElement.offsetWidth, true);
} catch (e){}
});
}
}
thumbnail.lastX = evt.screenX;
});
thumbnail.parentNode.addEventListener('mouseout', function(evt) {
if(!thumbnail.overlocker) return;
thumbnail.overlocker.then(function () {
if(evt.relatedTarget) {
if (thumbnail.parentElement.contains(evt.relatedTarget)) return;
if (evt.relatedTarget.className.indexOf('yt-uix-tooltip-tip') !== -1) return;
}
if(thumbnail.watchedContainer) {
for (var i = 0; i < thumbnail.watchedContainer.length; i++)
thumbnail.watchedContainer[i].classList.add('watched');
thumbnail.watchedContainer = null;
}
if(thumbnail.watchedBadgeContainer) {
for (var i = 0; i < thumbnail.watchedBadgeContainer.length; i++)
thumbnail.watchedBadgeContainer[i].style.display = null;
thumbnail.watchedBadgeContainer = null;
}
if(thumbnail.imageContainer) {
for (var i = 0; i < thumbnail.imageContainer.length; i++)
thumbnail.imageContainer[i].style.opacity = null;
thumbnail.imageContainer = null;
}
if(thumbnail.PPlayer) {
thumbnail.PPlayer.then(function(PPlayer) {
if(PPlayer.a.parentNode)
PPlayer.a.parentNode.removeChild(PPlayer.a);
thumbnail.PPlayer = null;
thumbnail.overlocker = null;
});
}
else {
thumbnail.overlocker = null;
}
});
});
});
}
function addGlobalStyle(css) {
var head = document.getElementsByTagName('head')[0];
if (!head) { return; }
var style = document.createElement('style');
style.type = 'text/css';
style.innerHTML = css;
head.appendChild(style);
}
init();
})();