From 79a015b77af9fae83fdae82307a5446a9ba7ed75 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?=E9=A9=AC=E4=B8=80=E4=B8=81?= <1769123563@qq.com>
Date: Sat, 15 Nov 2025 02:37:01 +0800
Subject: [PATCH] Improve PDF Export
---
ReportEngine/renderers/html_renderer.py | 218 +++++++++++++++++++++---
1 file changed, 198 insertions(+), 20 deletions(-)
diff --git a/ReportEngine/renderers/html_renderer.py b/ReportEngine/renderers/html_renderer.py
index a3d3199..2b8b47e 100644
--- a/ReportEngine/renderers/html_renderer.py
+++ b/ReportEngine/renderers/html_renderer.py
@@ -193,10 +193,22 @@ class HTMLRenderer:
chapters = "".join(self._render_chapter(chapter) for chapter in self.chapters)
widget_scripts = "\n".join(self.widget_scripts)
hydration = self._hydration_script()
+ overlay = """
+
+""".strip()
return f"""
{header}
+{overlay}
{cover}
{hero}
@@ -1524,6 +1536,75 @@ body {{
.action-btn:hover {{
transform: translateY(-1px);
}}
+body.exporting {{
+ cursor: progress;
+}}
+.export-overlay {{
+ position: fixed;
+ inset: 0;
+ background: rgba(3, 9, 26, 0.55);
+ backdrop-filter: blur(2px);
+ display: flex;
+ align-items: center;
+ justify-content: center;
+ opacity: 0;
+ pointer-events: none;
+ transition: opacity 0.3s ease;
+ z-index: 999;
+}}
+.export-overlay.active {{
+ opacity: 1;
+ pointer-events: all;
+}}
+.export-dialog {{
+ background: rgba(12, 19, 38, 0.92);
+ padding: 24px 32px;
+ border-radius: 18px;
+ color: #fff;
+ text-align: center;
+ min-width: 280px;
+ box-shadow: 0 16px 40px rgba(0,0,0,0.45);
+}}
+.export-spinner {{
+ width: 48px;
+ height: 48px;
+ border-radius: 50%;
+ border: 3px solid rgba(255,255,255,0.2);
+ border-top-color: var(--secondary-color);
+ margin: 0 auto 16px;
+ animation: export-spin 1s linear infinite;
+}}
+.export-status {{
+ margin: 0;
+ font-size: 1rem;
+}}
+.export-progress {{
+ width: 220px;
+ height: 6px;
+ background: rgba(255,255,255,0.25);
+ border-radius: 999px;
+ overflow: hidden;
+ margin: 20px auto 0;
+ position: relative;
+}}
+.export-progress-bar {{
+ position: absolute;
+ top: 0;
+ bottom: 0;
+ width: 45%;
+ border-radius: inherit;
+ background: linear-gradient(90deg, var(--primary-color), var(--secondary-color));
+ animation: export-progress 1.4s ease-in-out infinite;
+}}
+@keyframes export-spin {{
+ from {{ transform: rotate(0deg); }}
+ to {{ transform: rotate(360deg); }}
+}}
+@keyframes export-progress {{
+ 0% {{ left: -45%; }}
+ 50% {{ left: 20%; }}
+ 100% {{ left: 110%; }}
+}}
main {{
max-width: {container_width};
margin: 40px auto;
@@ -1777,6 +1858,23 @@ pre.code-block {{
box-shadow: none;
margin: 0;
}}
+ .chapter > *,
+ .hero-section,
+ .callout,
+ .chart-card,
+ .kpi-grid,
+ .table-wrap,
+ figure,
+ blockquote {{
+ break-inside: avoid;
+ page-break-inside: avoid;
+ }}
+ .chapter h2,
+ .chapter h3,
+ .chapter h4 {{
+ break-after: avoid;
+ page-break-after: avoid;
+ }}
}}
"""
@@ -2103,32 +2201,112 @@ function hydrateCharts() {
});
}
+function getExportOverlayParts() {
+ const overlay = document.getElementById('export-overlay');
+ if (!overlay) {
+ return null;
+ }
+ return {
+ overlay,
+ status: overlay.querySelector('.export-status')
+ };
+}
+
+function showExportOverlay(message) {
+ const parts = getExportOverlayParts();
+ if (!parts) return;
+ if (message && parts.status) {
+ parts.status.textContent = message;
+ }
+ parts.overlay.classList.add('active');
+ document.body.classList.add('exporting');
+}
+
+function updateExportOverlay(message) {
+ if (!message) return;
+ const parts = getExportOverlayParts();
+ if (parts && parts.status) {
+ parts.status.textContent = message;
+ }
+}
+
+function hideExportOverlay(delay) {
+ const parts = getExportOverlayParts();
+ if (!parts) return;
+ const close = () => {
+ parts.overlay.classList.remove('active');
+ document.body.classList.remove('exporting');
+ };
+ if (delay && delay > 0) {
+ setTimeout(close, delay);
+ } else {
+ close();
+ }
+}
+
function exportPdf() {
const target = document.querySelector('main');
- if (!target || typeof html2canvas === 'undefined' || typeof jspdf === 'undefined') {
+ if (!target || typeof jspdf === 'undefined' || typeof jspdf.jsPDF !== 'function') {
alert('PDF导出依赖未就绪');
return;
}
- html2canvas(target, {scale: 2}).then(canvas => {
- const imgData = canvas.toDataURL('image/png');
- const pdf = new jspdf.jsPDF('p', 'mm', 'a4');
- const pageWidth = pdf.internal.pageSize.getWidth();
- const pageHeight = pdf.internal.pageSize.getHeight();
- const imgHeight = canvas.height * pageWidth / canvas.width;
- let heightLeft = imgHeight;
- let position = 0;
-
- pdf.addImage(imgData, 'PNG', 0, position, pageWidth, imgHeight);
- heightLeft -= pageHeight;
-
- while (heightLeft > 0) {
- position = heightLeft - imgHeight;
- pdf.addPage();
- pdf.addImage(imgData, 'PNG', 0, position, pageWidth, imgHeight);
- heightLeft -= pageHeight;
+ const exportBtn = document.getElementById('export-btn');
+ if (exportBtn) {
+ exportBtn.disabled = true;
+ }
+ showExportOverlay('正在导出PDF，请稍候...');
+ const pdf = new jspdf.jsPDF('p', 'mm', 'a4');
+ const pageWidth = pdf.internal.pageSize.getWidth();
+ const pxWidth = Math.max(target.scrollWidth, document.documentElement.scrollWidth);
+ const restoreButton = () => {
+ if (exportBtn) {
+ exportBtn.disabled = false;
}
- pdf.save('report.pdf');
- });
+ };
+ let renderTask;
+ try {
+ renderTask = pdf.html(target, {
+ x: 8,
+ y: 12,
+ width: pageWidth - 16,
+ margin: [12, 12, 20, 12],
+ autoPaging: 'text',
+ windowWidth: pxWidth,
+ pagebreak: {
+ mode: ['css', 'legacy'],
+ avoid: ['.chapter > *', '.callout', '.chart-card', '.table-wrap', '.kpi-grid', '.hero-section']
+ },
+ html2canvas: {
+ scale: 0.72,
+ useCORS: true,
+ logging: false
+ },
+ callback: (doc) => doc.save('report.pdf')
+ });
+ } catch (err) {
+ console.error('PDF 导出失败', err);
+ updateExportOverlay('导出失败，请稍后重试');
+ hideExportOverlay(1200);
+ restoreButton();
+ alert('PDF导出失败，请稍后重试');
+ return;
+ }
+ if (renderTask && typeof renderTask.then === 'function') {
+ renderTask.then(() => {
+ updateExportOverlay('导出完成，正在保存...');
+ hideExportOverlay(800);
+ restoreButton();
+ }).catch(err => {
+ console.error('PDF 导出失败', err);
+ updateExportOverlay('导出失败，请稍后重试');
+ hideExportOverlay(1200);
+ restoreButton();
+ alert('PDF导出失败，请稍后重试');
+ });
+ } else {
+ hideExportOverlay();
+ restoreButton();
+ }
}
document.addEventListener('DOMContentLoaded', () => {