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用户:Hehua/filepreview.js
来自Postal Wiki
< 用户:Hehua
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/**
* FilePreview — 文件链接悬停预览脚本
* 鼠标悬停在 File: 蓝色链接上时,弹出浮窗显示:
* - 缩略图预览
* - 文件信息(尺寸、大小、上传者)
* - 分类 (categories)
* - 版权/许可模板 (templates)
*
* 安装方式:将本脚本的内容复制到你的
* User:<你的名字>/common.js 或 MediaWiki:Common.js
* 或通过 importScript 引入。
*/
mw.loader.using(['mediawiki.api', 'mediawiki.util']).then(function () {
'use strict';
var CONFIG = {
delay: 400, // 悬停延迟 (ms)
thumbWidth: 220, // 缩略图宽度
maxPopupWidth: 460,
maxPopupHeight: 520
};
/* ---------- state ---------- */
var state = {
link: null,
fetchTimer: null,
hideTimer: null,
popup: null
};
/* ---------- popup DOM ---------- */
function getPopup() {
if (!state.popup) {
var el = document.createElement('div');
el.id = 'filepreview-popup';
el.style.cssText = [
'display:none',
'position:fixed',
'z-index:9999',
'background:#fff',
'border:1px solid #c8ccd1',
'border-radius:6px',
'box-shadow:0 4px 16px rgba(0,0,0,0.2)',
'padding:14px',
'max-width:' + CONFIG.maxPopupWidth + 'px',
'max-height:' + CONFIG.maxPopupHeight + 'px',
'overflow-y:auto',
'font:13px/1.5 sans-serif',
'color:#222',
'pointer-events:auto'
].join(';');
document.body.appendChild(el);
state.popup = el;
// 鼠标移到浮窗上时不隐藏
el.addEventListener('mouseenter', function () {
clearTimeout(state.hideTimer);
clearTimeout(state.fetchTimer);
});
el.addEventListener('mouseleave', function (e) {
if (e.relatedTarget && e.relatedTarget.closest && e.relatedTarget.closest('a') === state.link) {
return;
}
hidePopup();
});
}
return state.popup;
}
function showPopup(x, y, html) {
var popup = getPopup();
popup.innerHTML = html;
popup.style.display = 'block';
var rect = popup.getBoundingClientRect();
var left = Math.max(6, Math.min(x + 12, window.innerWidth - rect.width - 6));
var top = Math.max(6, Math.min(y + 12, window.innerHeight - rect.height - 6));
popup.style.left = left + 'px';
popup.style.top = top + 'px';
}
function hidePopup() {
clearTimeout(state.hideTimer);
clearTimeout(state.fetchTimer);
if (state.popup) state.popup.style.display = 'none';
state.link = null;
}
/* ---------- helpers ---------- */
function getFileTitle(link) {
var title = link.getAttribute('title') || link.getAttribute('data-title') || '';
var m = title.match(/^(File|Image):(.+)$/i);
if (m) return m[1] + ':' + m[2];
// 后备:从 href 解析
var href = link.getAttribute('href') || '';
m = href.match(/[?&]title=(File|Image):([^&]+)/);
if (m) return m[1] + ':' + decodeURIComponent(m[2].replace(/\+/g, ' '));
return null;
}
function isFileLink(link) {
if (!link || !link.href) return false;
var title = link.getAttribute('title') || '';
if (/^(File|Image):/i.test(title)) return true;
return /[?&]title=(File|Image):/i.test(link.search || link.href);
}
function fmtBytes(b) {
if (!b) return '?';
if (b < 1024) return b + ' B';
if (b < 1048576) return (b / 1024).toFixed(1) + ' KB';
return (b / 1048576).toFixed(1) + ' MB';
}
function esc(s) {
return mw.html.escape(String(s));
}
/* ---------- API ---------- */
function fetchFileData(fileTitle) {
var api = new mw.Api();
return api.get({
action: 'query',
titles: fileTitle,
prop: 'categories|templates|imageinfo|info',
cllimit: 50,
tllimit: 50,
clprop: 'sortkey',
iiprop: 'url|size|user|comment|timestamp|extmetadata',
iiurlwidth: CONFIG.thumbWidth,
format: 'json'
});
}
/* ---------- render ---------- */
function renderPopup(data, x, y) {
var pages = data.query && data.query.pages;
if (!pages) { showPopup(x, y, '<div style="color:#c00;">无法获取数据</div>'); return; }
var id = Object.keys(pages)[0];
var page = pages[id];
if (id === '-1' || !page) {
showPopup(x, y, '<div style="color:#888;">文件页面不存在</div>');
return;
}
var parts = [];
parts.push('<div style="font-weight:bold;font-size:14px;margin-bottom:6px;word-break:break-all;">' + esc(page.title) + '</div>');
// 缩略图
var ii = page.imageinfo && page.imageinfo[0];
if (ii) {
if (ii.thumburl) {
parts.push('<div style="text-align:center;margin-bottom:8px;"><a href="' + esc(ii.url) + '" target="_blank">' +
'<img src="' + esc(ii.thumburl) + '" alt="" style="max-width:100%;border:1px solid #eaecf0;border-radius:3px;"></a></div>');
}
var meta = [];
if (ii.width && ii.height) meta.push(ii.width + '×' + ii.height + ' (' + fmtBytes(ii.size) + ')');
if (ii.user) meta.push('上传者: ' + esc(ii.user));
if (meta.length) parts.push('<div style="color:#555;margin-bottom:4px;font-size:12px;">' + meta.join(' | ') + '</div>');
// 许可信息 (extmetadata)
if (ii.extmetadata) {
var licField = ii.extmetadata.LicenseShortName || ii.extmetadata.License || ii.extmetadata.Copyright;
if (licField) {
var licVal = licField.value || licField;
parts.push('<div style="color:#555;margin-bottom:4px;font-size:12px;">许可: ' + esc(String(licVal)) + '</div>');
}
}
}
// 分类
if (page.categories && page.categories.length) {
parts.push('<div style="margin-top:8px;font-weight:bold;font-size:13px;">分类</div>');
parts.push('<ul style="margin:2px 0 0 14px;padding:0;list-style:none;">');
var cats = page.categories.slice(0, 25);
cats.forEach(function (c) {
parts.push('<li style="padding:1px 0;font-size:12px;">• ' + esc(c.title.replace(/^Category:/, '')) + '</li>');
});
if (page.categories.length > 25) {
parts.push('<li style="color:#888;font-size:12px;">… 还有 ' + (page.categories.length - 25) + ' 个</li>');
}
parts.push('</ul>');
} else {
parts.push('<div style="margin-top:6px;color:#888;font-size:12px;">无分类</div>');
}
// 模板(含版权模板)
if (page.templates && page.templates.length) {
parts.push('<div style="margin-top:8px;font-weight:bold;font-size:13px;">模板 (含版权/许可)</div>');
parts.push('<div style="margin:2px 0 0;max-height:130px;overflow-y:auto;">');
var tpls = page.templates.slice(0, 40);
tpls.forEach(function (t) {
var name = t.title.replace(/^Template:/, '');
parts.push('<span style="display:inline-block;background:#f0f2f5;border:1px solid #d4d8dd;border-radius:3px;padding:1px 5px;margin:1px 2px;font:12px monospace;color:#333;">{{' + esc(name) + '}}</span>');
});
if (page.templates.length > 40) {
parts.push('<span style="color:#888;font-size:11px;"> …+' + (page.templates.length - 40) + '</span>');
}
parts.push('</div>');
}
// 底部链接
var url = mw.config.get('wgScript') || '/wiki/';
var target = page.title.replace(/ /g, '_');
parts.push('<div style="margin-top:10px;border-top:1px solid #eaecf0;padding-top:6px;text-align:right;font-size:12px;">' +
'<a href="' + url + esc(target) + '" target="_blank">打开文件页 →</a></div>');
showPopup(x, y, parts.join(''));
}
/* ---------- hover handlers ---------- */
function onLinkOver(e) {
var link = e.target.closest ? e.target.closest('a[href]') : null;
if (!link || !isFileLink(link)) return;
if (link === state.link) return;
clearTimeout(state.fetchTimer);
clearTimeout(state.hideTimer);
state.link = link;
var title = getFileTitle(link);
if (!title) return;
state.fetchTimer = setTimeout(function () {
showPopup(e.clientX, e.clientY, '<div style="color:#888;font-size:13px;">加载中… ' + esc(title) + '</div>');
fetchFileData(title).then(function (data) {
if (state.link === link) renderPopup(data, e.clientX, e.clientY);
}).catch(function (err) {
if (state.link === link) showPopup(e.clientX, e.clientY, '<div style="color:#c00;">请求失败: ' + esc(String(err)) + '</div>');
});
}, CONFIG.delay);
}
function onLinkOut(e) {
var link = e.target.closest ? e.target.closest('a[href]') : null;
if (!link || !isFileLink(link)) return;
if (link !== state.link) return;
// 如果鼠标进入浮窗则不隐藏
clearTimeout(state.fetchTimer);
state.hideTimer = setTimeout(function () {
hidePopup();
}, 200);
}
/* ---------- install ---------- */
document.addEventListener('mouseover', onLinkOver, true);
document.addEventListener('mouseout', onLinkOut, true);
// 滚动时隐藏
window.addEventListener('scroll', function () { hidePopup(); }, true);
});