// ==UserScript== // @name Github图片预览增强 // @name:en Github Image Preview Plus // @namespace https://github.com/Re0XIAOPA/Github-Image-Preview-Plus // @version 0.1.1 // @description 增强GitHub图片浏览体验 - 支持单击丝滑预览（自适应显示/缩放/拖拽/左右切换/下载），双击跳转原图，快捷键操作，兼容多种GitHub页面 // @description:en Enhance GitHub image browsing experience - supports smooth preview with single click (adaptive display/zoom/drag/switch/download), double-click to jump to original image, keyboard shortcuts, compatible with various GitHub pages // @author Re0XIAOPA // @license MIT // @match *://github.com/* // @grant none // @tag Github // @icon data:image/svg+xml;base64,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 // @license MIT // @homepage https://github.com/Re0XIAOPA/Github-Image-Preview-Plus // @supportURL https://github.com/Re0XIAOPA/Github-Image-Preview-Plus/issues // ==/UserScript== /*** * ii. ;9ABH, * SA391, .r9GG35&G * &#ii13Gh; i3X31i;:,rB1 * iMs,:,i5895, .5G91:,:;:s1:8A * 33::::,,;5G5, ,58Si,,:::,sHX;iH1 * Sr.,:;rs13BBX35hh11511h5Shhh5S3GAXS:.,,::,,1AG3i,GG * .G51S511sr;;iiiishS8G89Shsrrsh59S;.,,,,,..5A85Si,h8 * :SB9s:,............................,,,.,,,SASh53h,1G. * .r18S;..,,,,,,,,,,,,,,,,,,,,,,,,,,,,,....,,.1H315199,rX, * ;S89s,..,,,,,,,,,,,,,,,,,,,,,,,....,,.......,,,;r1ShS8,;Xi * i55s:.........,,,,,,,,,,,,,,,,.,,,......,.....,,....r9&5.:X1 * 59;.....,. .,,,,,,,,,,,... .............,..:1;.:&s * s8,..;53S5S3s. .,,,,,,,.,.. i15S5h1:.........,,,..,,:99 * 93.:39s:rSGB@A; ..,,,,..... .SG3hhh9G&BGi..,,,,,,,,,,,,.,83 * G5.G8 9#@@@@@X. .,,,,,,..... iA9,.S&B###@@Mr...,,,,,,,,..,.;Xh * Gs.X8 S@@@@@@@B:..,,,,,,,,,,. rA1 ,A@@@@@@@@@H:........,,,,,,.iX: * ;9. ,8A#@@@@@@#5,.,,,,,,,,,... 9A. 8@@@@@@@@@@M; ....,,,,,,,,S8 * X3 iS8XAHH8s.,,,,,,,,,,...,..58hH@@@@@@@@@Hs ...,,,,,,,:Gs * r8, ,,,...,,,,,,,,,,..... ,h8XABMMHX3r. .,,,,,,,.rX: * :9, . .:,..,:;;;::,.,,,,,.. .,,. ..,,,,,,.59 * .Si ,:.i8HBMMMMMB&5,.... . .,,,,,.sMr * SS :: h@@@@@@@@@@#; . ... . ..,,,,iM5 * 91 . ;:.,1&@@@@@@MXs. . .,,:,:&S * hS .... .:;,,,i3MMS1;..,..... . . ... ..,:,.99 * ,8; ..... .,:,..,8Ms:;,,,... .,::.83 * s&: .... .sS553B@@HX3s;,. .,;13h. .:::&1 * SXr . ...;s3G99XA&X88Shss11155hi. ,;:h&, * iH8: . .. ,;iiii;,::,,,,,. .;irHA * ,8X5; . ....... ,;iihS8Gi * 1831, .,;irrrrrs&@ * ;5A8r. .:;iiiiirrss1H * :X@H3s....... .,:;iii;iiiiirsrh * r#h:;,...,,.. .,,:;;;;;:::,... .:;;;;;;iiiirrss1 * ,M8 ..,....,.....,,::::::,,... . .,;;;iiiiiirss11h * 8B;.,,,,,,,.,..... . .. .:;;;;iirrsss111h * i@5,:::,,,,,,,,.... . . .:::;;;;;irrrss111111 * 9Bi,:,,,,...... ..r91;;;;;iirrsss1ss1111 */ (function () { 'use strict'; // ==================== 1. 注入样式 ==================== // 使用 insertAdjacentHTML 一次性注入所有 CSS，减少 DOM 操作 document.head.insertAdjacentHTML('beforeend', ``); // ==================== 2. 注入 DOM 结构 ==================== document.body.insertAdjacentHTML('beforeend', `
预览图片
`); // ==================== 3. 获取核心元素 ==================== const mask = document.getElementById('gh-img-preview-mask'); const container = document.getElementById('gh-img-preview-container'); const img = document.getElementById('gh-img-preview-img'); const closeBtn = document.getElementById('gh-img-preview-close'); const downloadBtn= document.getElementById('gh-img-preview-download'); const prevBtn = document.getElementById('gh-img-preview-prev'); const nextBtn = document.getElementById('gh-img-preview-next'); // ==================== 4. 状态变量 ==================== let scale = 1, tx = 0, ty = 0; // 缩放比例和平移量 let dragging = false; // 是否正在拖拽 let rafId = null; // requestAnimationFrame ID（拖拽优化用） let images = []; // 当前页面所有可预览图片数组 let currentIdx = 0; // 当前预览图片索引 let clickTimer = null; // 用于区分单击和双击的定时器 // ==================== 5. 核心工具函数 ==================== // 重置图片位置和缩放 const reset = () => { scale = 1; tx = ty = 0; container.style.transform = 'translate(0px,0px) scale(1)'; img.classList.remove('loaded'); }; // 关闭预览弹窗 const close = () => { document.body.classList.remove('img-preview-active'); document.body.style.overflow = ''; setTimeout(reset, 300); // 等待淡出动画完成再重置 }; // 下载当前预览图片 const download = () => { const url = img.src; const name = url.split('/').pop().split('?')[0] || 'github-image.png'; fetch(url) .then(r => r.blob()) .then(blob => { const a = document.createElement('a'); a.href = URL.createObjectURL(blob); a.download = name; a.click(); URL.revokeObjectURL(a.href); }); }; // 更新左右切换按钮状态 const updateNav = () => { prevBtn.classList.toggle('disabled', currentIdx === 0); nextBtn.classList.toggle('disabled', currentIdx === images.length - 1); }; // 加载指定索引的图片 const load = (idx) => { if (idx < 0 || idx >= images.length) return; currentIdx = idx; const el = images[idx]; img.src = el.dataset.src || el.src; reset(); img.onload = () => img.classList.add('loaded'); updateNav(); }; // 打开预览（传入被点击的图片元素） const open = (clickedEl) => { // 重新收集当前页面所有可预览图片（支持动态加载） images = Array.from(document.querySelectorAll('.markdown-body img, .comment-body img, .blob-wrapper img')) .filter(el => el.src && !el.src.endsWith('.svg') && !el.closest('[data-lightbox]')); currentIdx = images.indexOf(clickedEl); if (currentIdx === -1) currentIdx = 0; load(currentIdx); document.body.classList.add('img-preview-active'); document.body.style.overflow = 'hidden'; updateNav(); }; // ==================== 6. 事件监听 ==================== // 点击遮罩背景或关闭按钮 → 关闭预览 mask.onclick = e => e.target === mask && close(); closeBtn.onclick = close; // 下载按钮 downloadBtn.onclick = download; // 左右切换 prevBtn.onclick = () => load(currentIdx - 1); nextBtn.onclick = () => load(currentIdx + 1); // 键盘支持（Esc 关闭，左右箭头切换） document.onkeydown = e => { if (!document.body.classList.contains('img-preview-active')) return; if (e.key === 'Escape') close(); if (e.key === 'ArrowLeft') load(currentIdx - 1); if (e.key === 'ArrowRight') load(currentIdx + 1); }; // 鼠标滚轮缩放（以鼠标位置为中心） container.onwheel = e => { e.preventDefault(); const rect = container.getBoundingClientRect(); const ox = e.clientX - rect.left - rect.width / 2; const oy = e.clientY - rect.top - rect.height / 2; const delta = e.deltaY < 0 ? 1.15 : 0.85; // 向上滚轮放大 const newScale = Math.max(0.3, Math.min(8, scale * delta)); tx = e.clientX - rect.left - rect.width / 2 - (ox / scale) * newScale; ty = e.clientY - rect.top - rect.height / 2 - (oy / scale) * newScale; scale = newScale; container.style.transform = `translate(${tx}px,${ty}px) scale(${scale})`; }; // 鼠标拖拽移动图片（使用 RAF 提高流畅度） container.onmousedown = e => { if (e.button !== 0) return; // 只响应左键 e.preventDefault(); dragging = true; const startX = e.clientX - tx; const startY = e.clientY - ty; container.style.cursor = 'grabbing'; const move = e => { tx = e.clientX - startX; ty = e.clientY - startY; cancelAnimationFrame(rafId); rafId = requestAnimationFrame(() => { container.style.transform = `translate(${tx}px,${ty}px) scale(${scale})`; }); }; const up = () => { dragging = false; container.style.cursor = 'move'; document.removeEventListener('mousemove', move); document.removeEventListener('mouseup', up); }; document.addEventListener('mousemove', move); document.addEventListener('mouseup', up); }; // 双击图片容器 → 复位到初始状态 container.ondblclick = reset; // ==================== 7. 图片点击事件绑定 ==================== const bind = () => { document.querySelectorAll('.markdown-body img, .comment-body img, .blob-wrapper img').forEach(el => { // 避免重复绑定、排除 SVG 和 GitHub 自带灯箱图片 if (el.dataset.bound || el.src.endsWith('.svg') || el.closest('[data-lightbox]')) return; el.dataset.bound = '1'; el.dataset.src = el.currentSrc || el.src; // 优先使用高清 src el.onclick = e => { e.preventDefault(); e.stopPropagation(); // 如果短时间内点击两次 → 视为双击，跳转到原图页面 if (clickTimer) { clearTimeout(clickTimer); clickTimer = null; const link = el.closest('a'); window.location.href = link?.href || el.src; return; } // 单击：延迟 300ms 后打开预览（给双击留出判断时间） clickTimer = setTimeout(() => { clickTimer = null; open(el); }, 300); }; }); }; // ==================== 8. 动态监听新加载的图片 ==================== new MutationObserver(bind).observe(document.body, { childList: true, subtree: true }); // ==================== 9. 初始化 ==================== bind(); // 页面加载完成立即绑定已有图片 })();