按住 Ctrl/Option 点击 GitHub 页面中的图片，即可在当前页面预览原图，支持滚轮缩放
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// ==UserScript==
// @name Git Image Preview (Ctrl/Option Click)
// @namespace https://github.com/stuarthua/git-image-preview
// @version 1.0.1
// @description 按住 Ctrl/Option 点击 GitHub 页面中的图片，即可在当前页面预览原图，支持滚轮缩放
// @author stuarthua
// @match https://github.com/*
// @icon https://raw.githubusercontent.com/stuarthua/git-image-preview/main/images/icon.png
// @homepageURL https://github.com/stuarthua/git-image-preview
// @license MIT
// @grant GM_addStyle
// ==/UserScript==
(function () {
'use strict';
// Add custom CSS for the modal
GM_addStyle(`
.image-preview-overlay {
position: fixed;
top: 0;
left: 0;
width: 100%;
height: 100%;
background: rgba(0, 0, 0, 0.8);
display: flex;
justify-content: center;
align-items: center;
z-index: 9999;
}
.image-preview-overlay img {
max-width: 90%;
max-height: 90%;
box-shadow: 0 0 20px black;
transition: transform 0.2s ease;
}
.image-preview-overlay .close-button {
position: absolute;
top: 20px;
right: 20px;
color: white;
font-size: 30px;
cursor: pointer;
}
`);
function showImagePreview(src) {
const overlay = document.createElement('div');
overlay.className = 'image-preview-overlay';
const img = document.createElement('img');
img.src = src;
let scale = 1;
overlay.addEventListener('wheel', (e) => {
e.preventDefault();
scale += e.deltaY < 0 ? 0.1 : -0.1;
scale = Math.min(Math.max(scale, 0.5), 5);
img.style.transform = `scale(${scale})`;
});
const closeButton = document.createElement('span');
closeButton.className = 'close-button';
closeButton.textContent = '×';
closeButton.onclick = () => document.body.removeChild(overlay);
overlay.appendChild(img);
overlay.appendChild(closeButton);
overlay.onclick = (e) => {
if (e.target === overlay) {
document.body.removeChild(overlay);
}
};
document.body.appendChild(overlay);
}
// Listen in capture phase to intercept before default behavior
document.addEventListener('click', function (e) {
const link = e.target.closest('a');
if (!link || !link.querySelector('img')) return;
const img = link.querySelector('img');
const isInMarkdown = link.closest('.markdown-body');
const isCtrlOrOptionPressed = e.ctrlKey || e.altKey || e.metaKey;
if (img && isInMarkdown && isCtrlOrOptionPressed) {
e.preventDefault();
e.stopImmediatePropagation();
showImagePreview(img.src);
}
}, true);
})();