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Lets you preview images in full resolution when hovering the thumbnail
// ==UserScript==
// @name r34 Image Previewer
// @namespace ImgPreview
// @version 1.0
// @description Lets you preview images in full resolution when hovering the thumbnail
// @author haruusyren
// @source https://github.com/innocence-studios/image-preview
// @license MIT
// @match *://rule34.xxx/*
// @icon data:image/png;base64,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
// @run-at document-end
// ==/UserScript==
(async function() {
'use strict';
document.querySelector('#post-list > span').remove(); // Removes the right container
document.querySelector('.image-list').style = 'width: 56dvw'; // Resizes the main container
let con = document.createElement('div');
con.style = 'width: stretch';
document.querySelector('#post-list').appendChild(con); // Creates the preview container
let extensions = [ 'png', 'jpg', 'jpeg', 'gif' ]; // Supported extensions
let targets = [];
let style = document.createElement('style'); // Usescript stylesheet
style.id = 'previewStylesheet';
document.head.appendChild(style);
style.sheet.insertRule('.prev { position: fixed; max-height: 100dvh; object-fit: cover; width: stretch; top: 50%; transform: translateY(-50%); }', style.sheet.cssRules.length);
style.sheet.insertRule('.loader { animation: l1 1s infinite; aspect-ratio: 1; border-radius: 50%; border: 8px solid; border-color: #000 #0000; width: 50px; margin: auto; }', style.sheet.cssRules.length);
style.sheet.insertRule('@keyframes l1 { to { transform: rotate(.5turn) } }', style.sheet.cssRules.length);
let loaderParent = document.createElement('div'); // Loading animation
loaderParent.className = 'prev';
con.appendChild(loaderParent);
let loader = document.createElement('div');
loader.className = 'loader';
loader.style.display = 'none'
loaderParent.appendChild(loader);
for (let i in extensions){
let target = document.createElement('img'); // One element per extension
target.className = 'prev';
target.alt = '';
con.appendChild(target);
targets.push(target);
}
for (let el of document.querySelectorAll('.thumb')){ // Adds event for each thumbnail
el.addEventListener('mouseover', () => {
loader.style.display = '';
let url = el.querySelector('img').src.replace('thumbnails', 'images').replace('thumbnail_', '').replace('.jpg', '.EXTENSION');
for (let i in targets) targets[i].src = url.replace('.EXTENSION', `.${extensions[i]}`);
});
el.addEventListener('mouseleave', () => {
loader.style.display = 'none';
for (let i in targets) targets[i].src = '';
});
}
})();