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feat: PDF对比用PDF.js渲染+滚动同步

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coder
2026-04-17 10:05:47 +08:00
parent 30527a5ce6
commit 5157561e83
2 changed files with 121 additions and 7 deletions
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98
templates/translation.html
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@@ -7,6 +7,7 @@
<link rel="icon" href="/static/img/favicon.svg" type="image/svg+xml">
<link href="https://cdn.jsdelivr.net/npm/bootstrap@5.3.0/dist/css/bootstrap.min.css" rel="stylesheet">
<link href="/static/css/style.css" rel="stylesheet">
<script src="https://cdnjs.cloudflare.com/ajax/libs/pdf.js/3.11.174/pdf.min.js"></script>
</head>
<body>
<nav class="navbar navbar-expand-lg navbar-dark bg-primary">
@@ -76,6 +77,9 @@
}
// 切换对比视图
let syncScrollEnabled = true;
let pdfDoc = null;
document.getElementById('toggleCompare').addEventListener('click', async function() {
showCompare = !showCompare;
@@ -84,29 +88,40 @@
const response = await fetch(`/api/compare/${translationId}`);
const result = await response.json();
// 原文面板：如果有PDF URL用iframe显示，否则显示提取的文本
// 原文面板：如果有PDF URL用PDF.js渲染，否则显示提取的文本
let originalHtml = '';
if (result.original_pdf_url) {
originalHtml = `<iframe src="${result.original_pdf_url}" style="width:100%;height:500px;border:none;"></iframe>`;
originalHtml = '<canvas id="pdfCanvas"></canvas><div id="pdfPages"></div>';
} else if (result.original && result.original.length > 0) {
originalHtml = `<div style="white-space:pre-wrap;font-family:monospace;">${escapeHtml(result.original)}</div>`;
originalHtml = `<div class="original-text" style="white-space:pre-wrap;font-family:monospace;">${escapeHtml(result.original)}</div>`;
} else {
originalHtml = '<div class="text-muted">原文内容未找到（可能PDF已被删除）</div>';
}
document.getElementById('resultContent').innerHTML = `
<div class="compare-container">
<div class="compare-panel original">
<div class="compare-panel original" id="originalPanel">
<h5>原文 PDF</h5>
${originalHtml}
<div id="pdfContainer">${originalHtml}</div>
</div>
<div class="compare-panel translated">
<div class="compare-panel translated" id="translatedPanel">
<h5>译文</h5>
<div>${renderMarkdown(result.translated)}</div>
<div class="translated-content">${renderMarkdown(result.translated)}</div>
</div>
</div>
<div class="text-center mt-2">
<small class="text-muted">💡 左右滚动同步，方便逐页对比</small>
</div>
`;
// 如果有PDF，用PDF.js渲染
if (result.original_pdf_url) {
renderPDF(result.original_pdf_url);
}
// 启用滚动同步
setTimeout(enableSyncScroll, 300);
} catch (error) {
alert('加载对比失败: ' + error.message);
}
@@ -115,6 +130,75 @@
}
});
// PDF.js渲染PDF
async function renderPDF(url) {
pdfjsLib.GlobalWorkerOptions.workerSrc = 'https://cdnjs.cloudflare.com/ajax/libs/pdf.js/3.11.174/pdf.worker.min.js';
try {
const pdf = await pdfjsLib.getDocument(url).promise;
pdfDoc = pdf;
const container = document.getElementById('pdfPages');
container.innerHTML = '';
// 渲染所有页面
for (let i = 1; i <= pdf.numPages; i++) {
const page = await pdf.getPage(i);
const canvas = document.createElement('canvas');
canvas.className = 'pdf-page-canvas';
canvas.style.width = '100%';
canvas.style.display = 'block';
canvas.style.marginBottom = '20px';
const context = canvas.getContext('2d');
const viewport = page.getViewport({ scale: 1.5 });
canvas.height = viewport.height;
canvas.width = viewport.width;
await page.render({
canvasContext: context,
viewport: viewport
}).promise;
container.appendChild(canvas);
// 添加页码标识
const pageNum = document.createElement('div');
pageNum.className = 'text-center text-muted mb-3';
pageNum.textContent = `— 第 ${i} 页 —`;
container.appendChild(pageNum);
}
} catch (error) {
document.getElementById('pdfContainer').innerHTML =
'<div class="text-danger">PDF加载失败: ' + error.message + '</div>';
}
}
// 滚动同步
function enableSyncScroll() {
const originalPanel = document.getElementById('originalPanel');
const translatedPanel = document.getElementById('translatedPanel');
if (!originalPanel || !translatedPanel) return;
originalPanel.addEventListener('scroll', function() {
if (!syncScrollEnabled) return;
syncScrollEnabled = false;
const ratio = this.scrollTop / (this.scrollHeight - this.clientHeight);
translatedPanel.scrollTop = ratio * (translatedPanel.scrollHeight - translatedPanel.clientHeight);
setTimeout(() => syncScrollEnabled = true, 50);
});
translatedPanel.addEventListener('scroll', function() {
if (!syncScrollEnabled) return;
syncScrollEnabled = false;
const ratio = this.scrollTop / (this.scrollHeight - this.clientHeight);
originalPanel.scrollTop = ratio * (originalPanel.scrollHeight - originalPanel.clientHeight);
setTimeout(() => syncScrollEnabled = true, 50);
});
}
// 重新翻译
document.getElementById('retranslateBtn')?.addEventListener('click', async function() {
const instruction = document.getElementById('retranslateInstruction').value;