Interactive Inline Gallery Carousel with full-res Images for Reddit Search Gallery.
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// ==UserScript==
// @name Reddit Search Preview Inline Interactive Gallery Carousel
// @namespace http://tampermonkey.net/
// @version 1.5
// @description Interactive Inline Gallery Carousel with full-res Images for Reddit Search Gallery.
// @author UniverseDev
// @license GPL-3.0-or-later
// @icon https://www.reddit.com/favicon.ico
// @match *://*.reddit.com/search/*type=media*
// @grant GM_addStyle
// @grant GM.xmlHttpRequest
// ==/UserScript==
(() => {
'use strict';
GM_addStyle(`
.reddit-carousel {
position: relative;
overflow: hidden;
width: 100%;
height: 100%;
cursor: default;
z-index: 1;
}
.reddit-carousel-slide-container {
display: flex;
transition: transform 150ms ease;
will-change: transform;
z-index: 1;
}
.reddit-carousel-slide {
flex: 0 0 100%;
width: 100%;
text-align: center;
display: flex;
justify-content: center;
align-items: center;
position: relative;
}
.reddit-carousel-slide img {
max-height: 100vw;
height: 100%;
width: 100%;
object-fit: contain;
object-position: center center;
margin: 0 auto;
z-index: 1;
}
.reddit-carousel-loading-overlay {
position: absolute;
top: 0;
left: 0;
width: 100%;
height: 100%;
background-color: #000;
z-index: 10;
}
.reddit-carousel-loading-global {
position: absolute;
top: 0;
left: 0;
width: 100%;
height: 100%;
background-color: #000;
z-index: 11;
}
.reddit-carousel-error {
color: red;
font-size: 14px;
padding: 20px;
z-index: 1;
}
.reddit-carousel-arrow {
position: absolute;
top: 50%;
transform: translateY(-50%);
background: rgba(0,0,0,0.7);
border: none;
width: 30px;
height: 30px;
cursor: pointer;
border-radius: 50%;
display: flex;
align-items: center;
justify-content: center;
z-index: 4;
transition: background 0.2s ease, transform 0.15s ease;
color: #fff;
box-shadow: 0 2px 4px rgba(0,0,0,0.4);
pointer-events: auto;
}
.reddit-carousel-arrow:hover {
background: rgba(0,0,0,0.85);
transform: translateY(-50%) scale(1.1);
box-shadow: 0 4px 8px rgba(0,0,0,0.5);
}
.reddit-carousel-arrow:active {
transform: translateY(-50%) scale(0.95);
}
.reddit-carousel-arrow svg {
width: 16px;
height: 16px;
fill: currentColor;
}
.reddit-carousel-arrow.left { left: 10px; display: none; }
.reddit-carousel-arrow.right { right: 10px; display: flex; }
`);
const redditCarousel_animateTransition = (container, start, end, duration, callback) => {
const startTime = performance.now();
const step = now => {
const progress = Math.min((now - startTime) / duration, 1);
const ease = 1 - Math.pow(1 - progress, 3);
container.style.transform = `translate3d(${start + (end - start) * ease}px, 0, 0)`;
if (progress < 1) requestAnimationFrame(step);
else if (callback) callback();
};
requestAnimationFrame(step);
};
function adjustSlideHeight(slide) {
const img = slide.querySelector('img');
if (!img) return;
if (!img.complete || img.naturalWidth === 0) {
img.addEventListener('load', () => adjustSlideHeight(slide));
return;
}
const aspectRatio = img.naturalWidth / img.naturalHeight;
const slideWidth = slide.clientWidth;
slide.style.height = (slideWidth / aspectRatio) + 'px';
}
function adjustAllSlideHeights() {
document.querySelectorAll('.reddit-carousel-slide').forEach(slide => adjustSlideHeight(slide));
centerImages();
}
function centerImages() {
document.querySelectorAll('.reddit-carousel-slide').forEach(slide => {
slide.style.display = 'flex';
slide.style.justifyContent = 'center';
slide.style.alignItems = 'center';
});
}
const redditCarousel_createCarousel = (primaryUrls, fallbackUrls, mediaMeta, altText) => {
if (!primaryUrls?.length) return null;
const carousel = document.createElement('div');
carousel.classList.add('reddit-carousel');
carousel.addEventListener('click', e => { e.stopPropagation(); e.preventDefault(); });
const slideContainer = document.createElement('div');
slideContainer.classList.add('reddit-carousel-slide-container');
carousel.appendChild(slideContainer);
let imagesLoaded = 0;
const totalImages = primaryUrls.length;
const globalOverlay = document.createElement('div');
globalOverlay.classList.add('reddit-carousel-loading-global');
carousel.appendChild(globalOverlay);
primaryUrls.forEach((url, i) => {
const slide = document.createElement('div');
slide.classList.add('reddit-carousel-slide');
const overlay = document.createElement('div');
overlay.classList.add('reddit-carousel-loading-overlay');
slide.appendChild(overlay);
const img = document.createElement('img');
img.src = url;
img.alt = altText;
if (fallbackUrls && fallbackUrls[i]) img.dataset.fallback = fallbackUrls[i];
img.onerror = function() {
if (this.dataset.fallback && this.src !== this.dataset.fallback) this.src = this.dataset.fallback;
else slide.innerHTML = '<div class="reddit-carousel-error">Image failed to load</div>';
};
img.addEventListener('load', () => {
redditCarousel_recalcDimensions();
redditCarousel_updateArrowVisibility();
updateArrowPositions();
adjustSlideHeight(slide);
const ov = slide.querySelector('.reddit-carousel-loading-overlay');
if (ov) ov.remove();
imagesLoaded++;
if (imagesLoaded === totalImages) {
globalOverlay.remove();
}
});
slide.appendChild(img);
slideContainer.appendChild(slide);
});
const carouselCounterWrapper = document.createElement('div');
carouselCounterWrapper.innerHTML = `<div class="absolute inset-0 overflow-visible flex items-right justify-end">
<button rpl="" class="pointer-events-none m-xs leading-4 pl-2xs pr-2xs py-0 text-sm h-fit button-small px-[var(--rem10)] button-media items-center justify-center button inline-flex ">
<span class="flex items-center justify-center">
<span class="carousel-counter flex items-center gap-xs">1/${primaryUrls.length}</span>
</span>
</button>
</div>`;
carousel.appendChild(carouselCounterWrapper);
let redditCarousel_currentIndex = 0, redditCarousel_currentOffset = 0;
const redditCarousel_recalcDimensions = () => {
const containerWidth = slideContainer.clientWidth;
redditCarousel_currentOffset = -redditCarousel_currentIndex * containerWidth;
slideContainer.style.transform = `translate3d(${redditCarousel_currentOffset}px, 0, 0)`;
};
const redditCarousel_updateCounter = () => {
const newCounterText = `${redditCarousel_currentIndex + 1}/${primaryUrls.length}`;
const carouselCounter = carousel.querySelector('.carousel-counter');
if (carouselCounter) carouselCounter.textContent = newCounterText;
};
const redditCarousel_goToSlide = index => {
index = Math.max(0, Math.min(index, primaryUrls.length - 1));
const containerWidth = slideContainer.clientWidth;
const startOffset = redditCarousel_currentOffset;
const endOffset = -index * containerWidth;
redditCarousel_animateTransition(slideContainer, startOffset, endOffset, 150, () => {
redditCarousel_currentOffset = endOffset;
redditCarousel_currentIndex = index;
redditCarousel_updateCounter();
redditCarousel_updateArrowVisibility();
updateArrowPositions();
});
};
let redditCarousel_leftArrow, redditCarousel_rightArrow;
if (primaryUrls.length > 1) {
const redditCarousel_createArrow = dir => {
const btn = document.createElement('button');
btn.classList.add('reddit-carousel-arrow', dir);
btn.addEventListener('click', e => { e.stopPropagation(); e.preventDefault(); });
const svg = document.createElementNS("http://www.w3.org/2000/svg", "svg");
svg.setAttribute("viewBox", "0 0 20 20");
const path = document.createElementNS("http://www.w3.org/2000/svg", "path");
path.setAttribute("d", "M12.793 19.707l-9-9a1 1 0 0 1 0-1.414l9-9 1.414 1.414L5.914 10l8.293 8.293-1.414 1.414Z");
svg.appendChild(path);
if (dir === 'right') svg.style.transform = 'scaleX(-1)';
btn.appendChild(svg);
return btn;
};
redditCarousel_leftArrow = redditCarousel_createArrow('left');
redditCarousel_leftArrow.addEventListener('click', () => { redditCarousel_goToSlide(redditCarousel_currentIndex - 1); });
carousel.appendChild(redditCarousel_leftArrow);
redditCarousel_rightArrow = redditCarousel_createArrow('right');
redditCarousel_rightArrow.addEventListener('click', () => { redditCarousel_goToSlide(redditCarousel_currentIndex + 1); });
carousel.appendChild(redditCarousel_rightArrow);
}
const redditCarousel_updateArrowVisibility = () => {
if (primaryUrls.length <= 1) return;
if (redditCarousel_currentIndex === 0) {
redditCarousel_leftArrow.style.display = 'none';
redditCarousel_rightArrow.style.display = 'flex';
} else if (redditCarousel_currentIndex === primaryUrls.length - 1) {
redditCarousel_leftArrow.style.display = 'flex';
redditCarousel_rightArrow.style.display = 'none';
} else {
redditCarousel_leftArrow.style.display = 'flex';
redditCarousel_rightArrow.style.display = 'flex';
}
};
const updateArrowPositions = () => {
requestAnimationFrame(() => {
const rect = carousel.getBoundingClientRect();
const arrowTop = (rect.height - 30) / 2;
if (redditCarousel_leftArrow) redditCarousel_leftArrow.style.top = arrowTop + 'px';
if (redditCarousel_rightArrow) redditCarousel_rightArrow.style.top = arrowTop + 'px';
});
};
updateArrowPositions();
let redditCarousel_resizeTimeout;
window.addEventListener('resize', () => {
clearTimeout(redditCarousel_resizeTimeout);
redditCarousel_resizeTimeout = setTimeout(() => {
redditCarousel_recalcDimensions();
redditCarousel_updateArrowVisibility();
updateArrowPositions();
adjustAllSlideHeights();
}, 100);
});
redditCarousel_updateArrowVisibility();
return carousel;
};
const redditCarousel_fetchAndProcessGallery = (postURL, container) => {
GM.xmlHttpRequest({
url: `${postURL}.json`,
method: 'GET',
onload: response => {
if (response.status >= 200 && response.status < 300) {
try {
const jsonData = JSON.parse(response.responseText);
const postData = jsonData[0]?.data?.children[0]?.data;
if (!postData) return;
const altText = postData.title || "Reddit Gallery Image";
let fullResUrls = [];
let previewUrls = [];
let mediaMeta = {};
if (postData.gallery_data && postData.media_metadata) {
mediaMeta = postData.media_metadata;
const { items } = postData.gallery_data;
fullResUrls = items.reduce((acc, item) => {
const meta = mediaMeta[item.media_id];
if (meta && meta.id && meta.m) {
let ext = "jpg";
if (meta.m.includes("png")) ext = "png";
else if (meta.m.includes("webp")) ext = "webp";
acc.push(`https://i.redd.it/${meta.id}.${ext}`);
}
return acc;
}, []);
previewUrls = items.reduce((acc, item) => {
const meta = mediaMeta[item.media_id];
let url;
if (meta && meta.p) {
if (Array.isArray(meta.p) && meta.p.length > 0) {
url = meta.p[meta.p.length - 1].u;
} else if (meta.p.u) {
url = meta.p.u;
}
if (url) {
url = url.replace(/&/g, '&');
acc.push(url);
}
}
return acc;
}, []);
}
let primaryUrls = [];
let fallbackUrls = [];
if (fullResUrls.length > 0) {
primaryUrls = fullResUrls;
fallbackUrls = previewUrls;
} else {
primaryUrls = previewUrls;
}
const carousel = redditCarousel_createCarousel(primaryUrls, fallbackUrls, mediaMeta, altText);
if (carousel) {
const targetElement = container.querySelector('.relative.w-full.h-full');
if (targetElement) {
targetElement.innerHTML = '';
targetElement.appendChild(carousel);
const parentLink = targetElement.closest('a');
if (parentLink) {
parentLink.addEventListener('click', e => { e.stopPropagation(); e.preventDefault(); });
}
}
}
} catch (error) {
console.error("JSON parse error:", error);
}
}
},
onerror: err => console.error("Request failed:", err)
});
};
const redditCarousel_galleryObserver = new IntersectionObserver((entries, observer) => {
entries.forEach(entry => {
if (entry.isIntersecting) {
const container = entry.target;
if (!container.hasAttribute('data-gallery-intersected')) {
container.setAttribute('data-gallery-intersected', 'true');
const postUnit = container.closest('div[data-id="search-media-post-unit"]');
const postLink = postUnit?.querySelector('a.no-underline');
const target = container || postUnit;
if (postLink?.href && target) redditCarousel_fetchAndProcessGallery(postLink.href, target);
}
observer.unobserve(container);
}
});
}, { threshold: 0.1 });
const redditCarousel_processSearchResults = () => {
document.querySelectorAll('div[data-id="search-media-post-unit"]').forEach(post => {
if (post.hasAttribute('data-gallery-checked')) return;
post.setAttribute('data-gallery-checked', 'true');
const indicator = post.querySelector('div.absolute.inset-0.overflow-visible.flex.items-right.justify-end button span');
if (indicator?.textContent.includes('/')) {
const container = post.querySelector('shreddit-aspect-ratio') || post;
if (container) redditCarousel_galleryObserver.observe(container);
}
});
};
let redditCarousel_ticking = false;
window.addEventListener('scroll', () => {
if (!redditCarousel_ticking) {
requestAnimationFrame(() => {
redditCarousel_processSearchResults();
redditCarousel_ticking = false;
});
redditCarousel_ticking = true;
}
});
window.addEventListener('load', redditCarousel_processSearchResults);
window.addEventListener('load', adjustAllSlideHeights);
})();