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FaceBook 贴文悬浮截图按钮

在贴文右上新增一个悬浮截图按钮，按下后可以对贴文进行截图保存，方便与其他人分享

当前为 2025-06-27 提交的版本，查看 最新版本。

// ==UserScript==
// @name         Floating Screenshot Button for Facebook Posts
// @name:zh-TW   FaceBook 貼文懸浮截圖按鈕
// @name:zh-CN   FaceBook 贴文悬浮截图按钮
// @namespace    http://tampermonkey.net/
// @version      2.5
// @description  A floating screenshot button is added to the top-right corner of the post. When clicked, it allows users to capture and save a screenshot of the post, making it easier to share with others.
// @description:zh-TW 在貼文右上新增一個懸浮截圖按鈕，按下後可以對貼文進行截圖保存，方便與其他人分享
// @description:zh-CN 在贴文右上新增一个悬浮截图按钮，按下后可以对贴文进行截图保存，方便与其他人分享
// @author       chatgpt
// @match        https://www.facebook.com/*
// @grant        none
// @require      https://cdn.jsdelivr.net/npm/[email protected]/dist/html-to-image.min.js
// @license MIT
// ==/UserScript==

(function () {
  'use strict';

  // ===== 禁用聚焦樣式，移除藍框或陰影 =====
  const style = document.createElement('style');
  style.textContent = `
    *:focus, *:focus-visible, *:focus-within {
      outline: none !important;
      box-shadow: none !important;
    }
  `;
  document.head.appendChild(style);

  let lastRun = 0; // 上一次主頁按鈕建立的時間
  const debounceDelay = 1000; // 間隔時間（毫秒）

  // ===== 從貼文中取得 fbid（供檔名使用）=====
  function getFbidFromPost(post) {
    const links = Array.from(post.querySelectorAll('a[href*="fbid="], a[href*="story_fbid="]'));
    for (const a of links) {
      try {
        const url = new URL(a.href);
        const fbid = url.searchParams.get('fbid') || url.searchParams.get('story_fbid');
        if (fbid) return fbid;
      } catch (e) { }
    }
    try {
      const dataFt = post.getAttribute('data-ft');
      if (dataFt) {
        const match = dataFt.match(/"top_level_post_id":"(\d+)"/);
        if (match) return match[1];
      }
    } catch (e) { }
    try {
      const url = new URL(window.location.href);
      const fbid = url.searchParams.get('fbid') || url.searchParams.get('story_fbid');
      if (fbid) return fbid;
    } catch (e) { }
    return 'unknownFBID';
  }

  // ===== 主頁貼文的截圖按鈕觀察器 =====
  const observer = new MutationObserver(() => {
    const now = Date.now();
    if (now - lastRun < debounceDelay) return;
    lastRun = now;

    document.querySelectorAll('div.x1lliihq').forEach(post => {
      if (post.dataset.sbtn === '1') return;

      let btnGroup = post.querySelector('div[role="group"]')
        || post.querySelector('div.xqcrz7y')
        || post.querySelector('div.x1qx5ct2');
      if (!btnGroup) return;

      post.dataset.sbtn = '1'; // 標記已處理
      btnGroup.style.position = 'relative';

      // 建立截圖按鈕
      const btn = document.createElement('div');
      btn.textContent = '📸';
      btn.title = '截圖貼文';
      Object.assign(btn.style, {
        position: 'absolute',
        left: '-40px',
        top: '0',
        width: '32px',
        height: '32px',
        display: 'flex',
        alignItems: 'center',
        justifyContent: 'center',
        borderRadius: '50%',
        backgroundColor: '#3A3B3C',
        color: 'white',
        cursor: 'pointer',
        zIndex: '9999',
        transition: 'background .2s',
      });

      btn.addEventListener('mouseenter', () => btn.style.backgroundColor = '#4E4F50');
      btn.addEventListener('mouseleave', () => btn.style.backgroundColor = '#3A3B3C');

      // 按下後進行截圖
      btn.addEventListener('click', async e => {
        e.stopPropagation();
        btn.textContent = '⏳';
        btn.style.pointerEvents = 'none';

        try {
          // 嘗試展開貼文內的「查看更多」
          const seeMoreCandidates = post.querySelectorAll('span, a, div, button');
          let clicked = false;
          for (const el of seeMoreCandidates) {
            const text = el.innerText?.trim() || el.textContent?.trim();
            if (!text) continue;
            if (text === '查看更多' || text === 'See more' || text === 'See More' || text === '…更多') {
              try {
                el.dispatchEvent(new MouseEvent('click', { bubbles: true, cancelable: true }));
                clicked = true;
                console.log('已點擊查看更多：', el);
              } catch (err) {
                console.warn('點擊查看更多失敗：', err);
              }
            }
          }
          if (clicked) await new Promise(r => setTimeout(r, 1000));

          // 滾動至貼文中央
          post.scrollIntoView({ behavior: 'smooth', block: 'center' });
          await new Promise(r => setTimeout(r, 500));

          const fbid = getFbidFromPost(post);
          const nowDate = new Date();
          const pad = n => n.toString().padStart(2, '0');
          const datetimeStr =
            nowDate.getFullYear().toString() +
            pad(nowDate.getMonth() + 1) +
            pad(nowDate.getDate()) + '_' +
            pad(nowDate.getHours()) + '_' +
            pad(nowDate.getMinutes()) + '_' +
            pad(nowDate.getSeconds());

          // 執行截圖
          const dataUrl = await window.htmlToImage.toPng(post, {
            backgroundColor: '#1c1c1d',
            pixelRatio: 2,
            cacheBust: true,
          });

          // 儲存圖片
          const filename = `${fbid}_${datetimeStr}.png`;
          const link = document.createElement('a');
          link.href = dataUrl;
          link.download = filename;
          link.click();

          btn.textContent = '✅';
        } catch (err) {
          console.error('截圖錯誤：', err);
          alert('截圖失敗，請稍後再試');
          btn.textContent = '❌';
        }

        // 一秒後還原按鈕狀態
        setTimeout(() => {
          btn.textContent = '📸';
          btn.style.pointerEvents = 'auto';
        }, 1000);
      });

      btnGroup.appendChild(btn);
    });
  });

  observer.observe(document.body, { childList: true, subtree: true });

// ====== 社團截圖按鈕功能 ======
let groupObserver = null;
function initGroupPostObserver() {
  if (groupObserver) return;
  groupObserver = new MutationObserver(() => {
    document.querySelectorAll('div.x1yztbdb.x1n2onr6.xh8yej3.x1ja2u2z').forEach(post => {
      if (post.dataset.sbtn === '1') return;
      let btnParent = post.querySelector('div.xqcrz7y.x78zum5.x1qx5ct2') ||
        post.closest('div.xqcrz7y.x78zum5.x1qx5ct2');
      if (!btnParent) return;
      post.dataset.sbtn = '1';
      btnParent.style.position = 'relative';

      const btn = document.createElement('div');
      btn.textContent = '📸';
      btn.title = '截圖社團貼文';
      Object.assign(btn.style, {
        position: 'absolute', left: '-40px', top: '0',
        width: '32px', height: '32px', display: 'flex',
        alignItems: 'center', justifyContent: 'center',
        borderRadius: '50%', backgroundColor: '#3A3B3C',
        color: 'white', cursor: 'pointer', zIndex: '9999',
        transition: 'background .2s',
      });

      btn.addEventListener('mouseenter', () => btn.style.backgroundColor = '#4E4F50');
      btn.addEventListener('mouseleave', () => btn.style.backgroundColor = '#3A3B3C');
      btn.addEventListener('click', async e => {
        e.stopPropagation();
        btn.textContent = '⏳'; btn.style.pointerEvents = 'none';

        try {
          post.querySelectorAll('span,a,div,button').forEach(el => {
            const txt = el.innerText?.trim() || el.textContent?.trim();
            if (['查看更多', 'See more', 'See More', '…更多'].includes(txt)) {
              el.dispatchEvent(new MouseEvent('click', { bubbles: true }));
            }
          });
          await new Promise(r => setTimeout(r, 1000));
          post.scrollIntoView({ behavior: 'smooth', block: 'center' });
          await new Promise(r => setTimeout(r, 500));

          const groupId = location.pathname.match(/^\/groups\/(\d+)/)?.[1] || 'unknownGroup';
          const now = new Date();
          const pad = n => n.toString().padStart(2, '0');
          const ts = `${now.getFullYear()}${pad(now.getMonth()+1)}${pad(now.getDate())}_${pad(now.getHours())}_${pad(now.getMinutes())}_${pad(now.getSeconds())}`;
          const filename = `${groupId}_${ts}.png`;

          const dataUrl = await htmlToImage.toPng(post, {
            backgroundColor: '#1c1c1d', pixelRatio: 2, cacheBust: true
          });
          const link = document.createElement('a');
          link.href = dataUrl; link.download = filename; link.click();

          btn.textContent = '✅';
        } catch (err) {
          console.error('社團截圖錯誤：', err);
          alert('截圖失敗，請稍後再試');
          btn.textContent = '❌';
        }
        setTimeout(() => { btn.textContent = '📸'; btn.style.pointerEvents = 'auto'; }, 1000);
      });

      btnParent.appendChild(btn);
    });
  });
  groupObserver.observe(document.body, { childList: true, subtree: true });
  console.log('[腳本] 社團觀察器已啟動');
}

function stopGroupPostObserver() {
  if (groupObserver) {
    groupObserver.disconnect(); groupObserver = null;
    console.log('[腳本] 社團觀察器已停止');
  }
}

// ====== 粉絲專頁截圖按鈕功能 ======
let pageObserver = null;
function initPagePostObserver() {
  if (pageObserver) return;
  pageObserver = new MutationObserver(() => {
    document.querySelectorAll('div.x1yztbdb.x1n2onr6.xh8yej3.x1ja2u2z').forEach(post => {
      if (post.dataset.sbtn === '1') return;
      let btnParent = post.querySelector('div.xqcrz7y.x78zum5.x1qx5ct2.x1y1aw1k.xf159sx.xwib8y2.xmzvs34.xw4jnvo') ||
        post.closest('div.xqcrz7y.x78zum5.x1qx5ct2.x1y1aw1k.xf159sx.xwib8y2.xmzvs34.xw4jnvo');
      if (!btnParent) return;
      post.dataset.sbtn = '1';
      btnParent.style.position = 'relative';

      const btn = document.createElement('div');
      btn.textContent = '📸';
      btn.title = '截圖粉專貼文';
      Object.assign(btn.style, {
        position: 'absolute', left: '-40px', top: '0',
        width: '32px', height: '32px', display: 'flex',
        alignItems: 'center', justifyContent: 'center',
        borderRadius: '50%', backgroundColor: '#3A3B3C',
        color: 'white', cursor: 'pointer', zIndex: '9999',
        transition: 'background .2s',
      });

      btn.addEventListener('mouseenter', () => btn.style.backgroundColor = '#4E4F50');
      btn.addEventListener('mouseleave', () => btn.style.backgroundColor = '#3A3B3C');
      btn.addEventListener('click', async e => {
        e.stopPropagation();
        btn.textContent = '⏳'; btn.style.pointerEvents = 'none';

        try {
          post.querySelectorAll('span,a,div,button').forEach(el => {
            const txt = el.innerText?.trim() || el.textContent?.trim();
            if (['查看更多', 'See more', 'See More', '…更多'].includes(txt)) {
              el.dispatchEvent(new MouseEvent('click', { bubbles: true }));
            }
          });
          await new Promise(r => setTimeout(r, 1000));
          post.scrollIntoView({ behavior: 'smooth', block: 'center' });
          await new Promise(r => setTimeout(r, 500));

          const now = new Date();
          const pad = n => n.toString().padStart(2, '0');
          const ts = `${now.getFullYear()}${pad(now.getMonth()+1)}${pad(now.getDate())}_${pad(now.getHours())}_${pad(now.getMinutes())}_${pad(now.getSeconds())}`;
          const pageName = location.pathname.split('/').filter(Boolean)[0] || 'page';
          const filename = `${pageName}_${ts}.png`;

          const dataUrl = await htmlToImage.toPng(post, {
            backgroundColor: '#1c1c1d', pixelRatio: 2, cacheBust: true
          });
          const link = document.createElement('a');
          link.href = dataUrl; link.download = filename; link.click();

          btn.textContent = '✅';
        } catch (err) {
          console.error('粉專截圖錯誤：', err);
          alert('截圖失敗，請稍後再試');
          btn.textContent = '❌';
        }
        setTimeout(() => { btn.textContent = '📸'; btn.style.pointerEvents = 'auto'; }, 1000);
      });

      btnParent.appendChild(btn);
    });
  });
  pageObserver.observe(document.body, { childList: true, subtree: true });
  console.log('[腳本] 粉專觀察器已啟動');
}

function stopPagePostObserver() {
  if (pageObserver) {
    pageObserver.disconnect();
    pageObserver = null;
    console.log('[腳本] 粉專觀察器已停止');
  }
}

let lastPathname = location.pathname;

// 判斷是否為社團頁面
function isGroupPage(path) {
  return path.startsWith('/groups/');
}

// 判斷是否為粉專頁面（排除常見非粉專頁）
function isPagePage(path) {
  if (isGroupPage(path)) return false;
  const segments = path.split('/').filter(Boolean);
  if (segments.length === 0) return false;

  // 排除非粉專常見路徑，例如 marketplace、gaming、watch 等
  const excluded = ['watch', 'gaming', 'marketplace', 'groups', 'friends', 'notifications', 'messages'];
  return !excluded.includes(segments[0]);
}

// 根據路徑切換對應的觀察器
function handlePathChange(newPath) {
  stopGroupPostObserver();
  stopPagePostObserver();

  if (isGroupPage(newPath)) {
    initGroupPostObserver();
  } else if (isPagePage(newPath)) {
    initPagePostObserver();
  } else {
    console.log(`[腳本] 非支援的頁面類型：${newPath}`);
  }
}

// 初次執行（初次載入）
handlePathChange(location.pathname);

// 每秒偵測路徑變化並切換觀察器
setInterval(() => {
  const currentPath = location.pathname;
  if (currentPath !== lastPathname) {
    lastPathname = currentPath;
    handlePathChange(currentPath);
  }
}, 1000);

})();

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