feat(report): accomplishment report PDF + shared PDF helpers

- lib/utils/pdf/pdf_letterhead.dart: PdfBrand with load(), letterhead(), theme(), and pageFooter() shared across CRMC PDF documents - lib/widgets/pdf_preview_dialog.dart: showPdfPreviewDialog() with pdfrx PdfViewer.data preview, Print (Printing.layoutPdf) and Download (Printing.sharePdf) buttons - lib/screens/programmer_tasks/report/accomplishment_report_pdf.dart: buildAccomplishmentReportPdf() — A4 MultiPage with letterhead, info box, accomplishment table, footnote, summary, signatures, page footer - test/accomplishment_report_pdf_test.dart: 2 passing tests Co-Authored-By: claude-flow <ruv@ruv.net>
2026-09-28 18:55:45 +08:00
parent 87014d1656
commit 167e208ffa
4 changed files with 579 additions and 0 deletions
@@ -0,0 +1,124 @@
+import 'dart:typed_data';
+import 'package:flutter/material.dart';
+import 'package:pdfrx/pdfrx.dart';
+import 'package:printing/printing.dart';
+
+/// Show a PDF preview dialog with Print and Download buttons.
+///
+/// [buildBytes] is called once and cached; the result is shared between the
+/// preview viewer and the action buttons.
+Future<void> showPdfPreviewDialog(
+  BuildContext context, {
+  required String title,
+  required String filename,
+  required Future<Uint8List> Function() buildBytes,
+}) {
+  return showDialog<void>(
+    context: context,
+    builder: (_) => _PdfPreviewDialog(
+      title: title,
+      filename: filename,
+      buildBytes: buildBytes,
+    ),
+  );
+}
+
+class _PdfPreviewDialog extends StatefulWidget {
+  const _PdfPreviewDialog({
+    required this.title,
+    required this.filename,
+    required this.buildBytes,
+  });
+
+  final String title;
+  final String filename;
+  final Future<Uint8List> Function() buildBytes;
+
+  @override
+  State<_PdfPreviewDialog> createState() => _PdfPreviewDialogState();
+}
+
+class _PdfPreviewDialogState extends State<_PdfPreviewDialog> {
+  late final Future<Uint8List> _future;
+
+  @override
+  void initState() {
+    super.initState();
+    _future = widget.buildBytes();
+  }
+
+  @override
+  Widget build(BuildContext context) {
+    return AlertDialog(
+      contentPadding: EdgeInsets.zero,
+      content: SizedBox(
+        width: 800,
+        height: 900,
+        child: Column(
+          children: [
+            Padding(
+              padding: const EdgeInsets.symmetric(horizontal: 12, vertical: 8),
+              child: Row(
+                children: [
+                  Expanded(
+                    child: Text(
+                      widget.title,
+                      style: const TextStyle(
+                        fontSize: 16,
+                        fontWeight: FontWeight.w600,
+                      ),
+                    ),
+                  ),
+                  IconButton(
+                    tooltip: 'Print',
+                    icon: const Icon(Icons.print),
+                    onPressed: () async {
+                      final bytes = await _future;
+                      await Printing.layoutPdf(
+                        onLayout: (_) async => bytes,
+                        name: widget.filename,
+                      );
+                    },
+                  ),
+                  IconButton(
+                    tooltip: 'Download',
+                    icon: const Icon(Icons.download),
+                    onPressed: () async {
+                      final bytes = await _future;
+                      await Printing.sharePdf(
+                        bytes: bytes,
+                        filename: widget.filename,
+                      );
+                    },
+                  ),
+                  IconButton(
+                    tooltip: 'Close',
+                    icon: const Icon(Icons.close),
+                    onPressed: () => Navigator.of(context).pop(),
+                  ),
+                ],
+              ),
+            ),
+            const Divider(height: 1),
+            Expanded(
+              child: FutureBuilder<Uint8List>(
+                future: _future,
+                builder: (context, snapshot) {
+                  if (snapshot.connectionState == ConnectionState.waiting) {
+                    return const Center(child: CircularProgressIndicator());
+                  }
+                  if (snapshot.hasError) {
+                    return Center(child: Text(snapshot.error.toString()));
+                  }
+                  final data = snapshot.data;
+                  if (data == null) return const SizedBox.shrink();
+                  return PdfViewer.data(data, sourceName: widget.filename);
+                },
+              ),
+            ),
+          ],
+        ),
+      ),
+    );
+  }
+}