537 lines
18 KiB
Dart
537 lines
18 KiB
Dart
import 'dart:math' as math;
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import 'package:file_selector/file_selector.dart' as fs;
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import 'package:flutter/material.dart';
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import 'package:flutter_riverpod/flutter_riverpod.dart';
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import 'package:pdfrx/pdfrx.dart';
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import 'package:path_provider/path_provider.dart' as pp;
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import 'dart:typed_data';
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import '../share/export_service.dart';
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import 'package:hand_signature/signature.dart' as hand;
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import 'package:meta/meta.dart';
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part 'viewer_state.dart';
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part 'viewer_widgets.dart';
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// Testing hook: allow using a mock viewer instead of pdfrx to avoid async I/O in widget tests
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final useMockViewerProvider = Provider<bool>((_) => false);
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// Export service injection for testability
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final exportServiceProvider = Provider<ExportService>((_) => ExportService());
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// Export DPI setting (points per inch mapping), default 144 DPI
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final exportDpiProvider = StateProvider<double>((_) => 144.0);
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// Controls whether signature overlay is visible (used to hide on non-stamped pages during export)
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final signatureVisibilityProvider = StateProvider<bool>((_) => true);
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// Save path picker (injected for tests)
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final savePathPickerProvider = Provider<Future<String?> Function()>((ref) {
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return () async {
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String? initialDir;
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try {
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final d = await pp.getDownloadsDirectory();
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initialDir = d?.path;
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} catch (_) {}
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if (initialDir == null) {
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try {
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final d = await pp.getApplicationDocumentsDirectory();
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initialDir = d.path;
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} catch (_) {}
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}
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final location = await fs.getSaveLocation(
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suggestedName: 'signed.pdf',
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acceptedTypeGroups: [
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const fs.XTypeGroup(label: 'PDF', extensions: ['pdf']),
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],
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initialDirectory: initialDir,
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);
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if (location == null) return null;
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final path = location.path;
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return path.toLowerCase().endsWith('.pdf') ? path : '$path.pdf';
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};
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});
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class PdfSignatureHomePage extends ConsumerStatefulWidget {
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const PdfSignatureHomePage({super.key});
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@override
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ConsumerState<PdfSignatureHomePage> createState() =>
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_PdfSignatureHomePageState();
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}
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class _PdfSignatureHomePageState extends ConsumerState<PdfSignatureHomePage> {
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static const Size _pageSize = SignatureController.pageSize;
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final GlobalKey _captureKey = GlobalKey();
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// Exposed for tests to trigger the invalid-file SnackBar without UI.
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@visibleForTesting
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void debugShowInvalidSignatureSnackBar() {
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ref.read(signatureProvider.notifier).setInvalidSelected(context);
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}
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Future<void> _pickPdf() async {
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final typeGroup = const fs.XTypeGroup(label: 'PDF', extensions: ['pdf']);
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final file = await fs.openFile(acceptedTypeGroups: [typeGroup]);
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if (file != null) {
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ref.read(pdfProvider.notifier).openPicked(path: file.path);
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ref.read(signatureProvider.notifier).resetForNewPage();
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}
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}
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void _jumpToPage(int page) {
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ref.read(pdfProvider.notifier).jumpTo(page);
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}
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void _toggleMarkForSigning() {
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ref.read(pdfProvider.notifier).toggleMark();
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}
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Future<void> _loadSignatureFromFile() async {
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final pdf = ref.read(pdfProvider);
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if (!pdf.markedForSigning) return;
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final typeGroup = const fs.XTypeGroup(
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label: 'Image',
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extensions: ['png', 'jpg', 'jpeg', 'webp'],
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);
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final file = await fs.openFile(acceptedTypeGroups: [typeGroup]);
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if (file == null) return;
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final bytes = await file.readAsBytes();
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final sig = ref.read(signatureProvider.notifier);
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sig.setImageBytes(bytes);
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}
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// removed invalid loader; not part of normal app
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void _onDragSignature(Offset delta) {
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ref.read(signatureProvider.notifier).drag(delta);
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}
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void _onResizeSignature(Offset delta) {
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ref.read(signatureProvider.notifier).resize(delta);
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}
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Future<void> _openDrawCanvas() async {
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final pdf = ref.read(pdfProvider);
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if (!pdf.markedForSigning) return;
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final result = await showModalBottomSheet<Uint8List>(
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context: context,
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isScrollControlled: true,
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enableDrag: false,
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builder: (_) => const DrawCanvas(),
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);
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if (result != null && result.isNotEmpty) {
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// Use the drawn image as signature content
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ref.read(signatureProvider.notifier).setImageBytes(result);
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}
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}
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Future<void> _saveSignedPdf() async {
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final pdf = ref.read(pdfProvider);
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final sig = ref.read(signatureProvider);
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if (!pdf.loaded || sig.rect == null) {
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ScaffoldMessenger.of(context).showSnackBar(
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const SnackBar(
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content: Text('Nothing to save yet'),
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), // guard per use-case
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);
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return;
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}
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final pick = ref.read(savePathPickerProvider);
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final path = await pick();
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if (path == null || path.trim().isEmpty) return;
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final fullPath = _ensurePdfExtension(path.trim());
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final exporter = ref.read(exportServiceProvider);
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final targetDpi = ref.read(exportDpiProvider);
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// Multi-page export: iterate pages by navigating the viewer
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final controller = ref.read(pdfProvider.notifier);
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final current = pdf.currentPage;
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final targetPage = pdf.signedPage; // may be null if not marked
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final ok = await exporter.exportMultiPageFromBoundary(
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boundaryKey: _captureKey,
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outputPath: fullPath,
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pageCount: pdf.pageCount,
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targetDpi: targetDpi,
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onGotoPage: (p) async {
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controller.jumpTo(p);
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// Show overlay only on the signed page (if any)
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// If a target page is specified, show overlay only on that page.
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// If not specified, keep overlay visible (backwards compatible single-page case).
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final show = targetPage == null ? true : (targetPage == p);
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ref.read(signatureVisibilityProvider.notifier).state = show;
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// Allow build to occur
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await Future<void>.delayed(const Duration(milliseconds: 20));
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},
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);
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// Restore page
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controller.jumpTo(current);
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// Restore visibility
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ref.read(signatureVisibilityProvider.notifier).state = true;
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if (ok) {
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ScaffoldMessenger.of(
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context,
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).showSnackBar(SnackBar(content: Text('Saved: $fullPath')));
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} else {
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ScaffoldMessenger.of(
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context,
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).showSnackBar(const SnackBar(content: Text('Failed to save PDF')));
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}
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}
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// Removed manual full-path dialog; using file_selector.getSaveLocation via provider
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String _ensurePdfExtension(String name) {
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if (!name.toLowerCase().endsWith('.pdf')) return '$name.pdf';
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return name;
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}
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@override
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Widget build(BuildContext context) {
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final pdf = ref.watch(pdfProvider);
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return Scaffold(
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appBar: AppBar(title: const Text('PDF Signature')),
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body: Padding(
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padding: const EdgeInsets.all(12),
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child: Column(
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children: [
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_buildToolbar(pdf),
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const SizedBox(height: 8),
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Expanded(child: _buildPageArea(pdf)),
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Consumer(
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builder: (context, ref, _) {
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final sig = ref.watch(signatureProvider);
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return sig.rect != null
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? _buildAdjustmentsPanel(sig)
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: const SizedBox.shrink();
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},
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),
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],
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),
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),
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);
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}
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Widget _buildToolbar(PdfState pdf) {
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final dpi = ref.watch(exportDpiProvider);
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final pageInfo = 'Page ${pdf.currentPage}/${pdf.pageCount}';
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return Wrap(
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spacing: 8,
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runSpacing: 8,
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crossAxisAlignment: WrapCrossAlignment.center,
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children: [
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OutlinedButton(
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key: const Key('btn_open_pdf_picker'),
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onPressed: _pickPdf,
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child: const Text('Open PDF...'),
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),
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if (pdf.loaded) ...[
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Row(
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mainAxisSize: MainAxisSize.min,
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children: [
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IconButton(
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key: const Key('btn_prev'),
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onPressed: () => _jumpToPage(pdf.currentPage - 1),
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icon: const Icon(Icons.chevron_left),
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tooltip: 'Prev',
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),
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Text(pageInfo, key: const Key('lbl_page_info')),
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IconButton(
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key: const Key('btn_next'),
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onPressed: () => _jumpToPage(pdf.currentPage + 1),
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icon: const Icon(Icons.chevron_right),
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tooltip: 'Next',
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),
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],
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),
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Row(
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mainAxisSize: MainAxisSize.min,
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children: [
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const Text('Go to:'),
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SizedBox(
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width: 60,
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child: TextField(
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key: const Key('txt_goto'),
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keyboardType: TextInputType.number,
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onSubmitted: (v) {
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final n = int.tryParse(v);
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if (n != null) _jumpToPage(n);
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},
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),
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),
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],
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),
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Row(
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mainAxisSize: MainAxisSize.min,
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children: [
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const Text('DPI:'),
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const SizedBox(width: 8),
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DropdownButton<double>(
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key: const Key('ddl_export_dpi'),
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value: dpi,
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items:
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const [96.0, 144.0, 200.0, 300.0]
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.map(
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(v) => DropdownMenuItem(
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value: v,
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child: Text(v.toStringAsFixed(0)),
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),
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)
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.toList(),
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onChanged: (v) {
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if (v != null) {
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ref.read(exportDpiProvider.notifier).state = v;
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}
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},
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),
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],
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),
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ElevatedButton(
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key: const Key('btn_mark_signing'),
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onPressed: _toggleMarkForSigning,
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child: Text(
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pdf.markedForSigning ? 'Unmark Signing' : 'Mark for Signing',
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),
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),
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if (pdf.loaded)
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ElevatedButton(
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key: const Key('btn_save_pdf'),
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onPressed: _saveSignedPdf,
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child: const Text('Save Signed PDF'),
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),
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if (pdf.markedForSigning) ...[
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OutlinedButton(
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key: const Key('btn_load_signature_picker'),
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onPressed: _loadSignatureFromFile,
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child: const Text('Load Signature from file'),
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),
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ElevatedButton(
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key: const Key('btn_draw_signature'),
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onPressed: _openDrawCanvas,
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child: const Text('Draw Signature'),
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),
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],
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],
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],
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);
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}
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Widget _buildPageArea(PdfState pdf) {
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if (!pdf.loaded) {
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return const Center(child: Text('No PDF loaded'));
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}
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final useMock = ref.watch(useMockViewerProvider);
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if (useMock) {
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return Center(
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child: AspectRatio(
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aspectRatio: _pageSize.width / _pageSize.height,
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child: RepaintBoundary(
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key: _captureKey,
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child: Stack(
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key: const Key('page_stack'),
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children: [
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Container(
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key: const Key('pdf_page'),
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color: Colors.grey.shade200,
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child: Center(
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child: Text(
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'Page ${pdf.currentPage}/${pdf.pageCount}',
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style: const TextStyle(
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fontSize: 24,
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color: Colors.black54,
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),
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),
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),
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),
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Consumer(
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builder: (context, ref, _) {
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final sig = ref.watch(signatureProvider);
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final visible = ref.watch(signatureVisibilityProvider);
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return sig.rect != null && visible
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? _buildSignatureOverlay(sig)
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: const SizedBox.shrink();
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},
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),
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],
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),
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),
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),
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);
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}
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// If a real PDF path is selected, show actual viewer. Otherwise, keep mock sample.
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if (pdf.pickedPdfPath != null) {
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return PdfDocumentViewBuilder.file(
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pdf.pickedPdfPath!,
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builder: (context, document) {
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if (document == null) {
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return const Center(child: CircularProgressIndicator());
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}
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final pages = document.pages;
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final pageNum = pdf.currentPage.clamp(1, pages.length);
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final page = pages[pageNum - 1];
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final aspect = page.width / page.height;
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// Update page count in state if needed (post-frame to avoid build loop)
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if (pdf.pageCount != pages.length) {
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WidgetsBinding.instance.addPostFrameCallback((_) {
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if (mounted) {
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ref.read(pdfProvider.notifier).setPageCount(pages.length);
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}
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});
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}
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return Center(
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child: AspectRatio(
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aspectRatio: aspect,
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child: RepaintBoundary(
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key: _captureKey,
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child: Stack(
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key: const Key('page_stack'),
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children: [
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PdfPageView(
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document: document,
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pageNumber: pageNum,
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alignment: Alignment.center,
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),
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Consumer(
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builder: (context, ref, _) {
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final sig = ref.watch(signatureProvider);
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final visible = ref.watch(signatureVisibilityProvider);
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return sig.rect != null && visible
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? _buildSignatureOverlay(sig)
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: const SizedBox.shrink();
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},
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),
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],
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),
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),
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),
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);
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},
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);
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}
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// Fallback should not occur when not using mock; still return empty view
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return const SizedBox.shrink();
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}
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Widget _buildSignatureOverlay(SignatureState sig) {
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final r = sig.rect!;
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return LayoutBuilder(
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builder: (context, constraints) {
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final scaleX = constraints.maxWidth / _pageSize.width;
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final scaleY = constraints.maxHeight / _pageSize.height;
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final left = r.left * scaleX;
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final top = r.top * scaleY;
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final width = r.width * scaleX;
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final height = r.height * scaleY;
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return Stack(
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children: [
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Positioned(
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left: left,
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top: top,
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width: width,
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height: height,
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child: GestureDetector(
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key: const Key('signature_overlay'),
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behavior: HitTestBehavior.opaque,
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onPanStart: (_) {},
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onPanUpdate:
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(d) => _onDragSignature(
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Offset(d.delta.dx / scaleX, d.delta.dy / scaleY),
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),
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child: DecoratedBox(
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decoration: BoxDecoration(
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color: Colors.black.withOpacity(
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0.05 + math.min(0.25, (sig.contrast - 1.0).abs()),
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),
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border: Border.all(color: Colors.indigo, width: 2),
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),
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child: Stack(
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children: [
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if (sig.imageBytes != null)
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Image.memory(sig.imageBytes!, fit: BoxFit.contain)
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else
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const Center(child: Text('Signature')),
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Positioned(
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right: 0,
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bottom: 0,
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child: GestureDetector(
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key: const Key('signature_handle'),
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behavior: HitTestBehavior.opaque,
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onPanUpdate:
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(d) => _onResizeSignature(
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Offset(
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d.delta.dx / scaleX,
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d.delta.dy / scaleY,
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),
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),
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child: const Icon(Icons.open_in_full, size: 20),
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),
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),
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],
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),
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),
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),
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),
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],
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);
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},
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);
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}
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Widget _buildAdjustmentsPanel(SignatureState sig) {
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return Column(
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key: const Key('adjustments_panel'),
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children: [
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Row(
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children: [
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Checkbox(
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key: const Key('chk_aspect_lock'),
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value: sig.aspectLocked,
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onChanged:
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(v) => ref
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.read(signatureProvider.notifier)
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.toggleAspect(v ?? false),
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),
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const Text('Lock aspect ratio'),
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const SizedBox(width: 16),
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Switch(
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key: const Key('swt_bg_removal'),
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value: sig.bgRemoval,
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onChanged:
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(v) => ref.read(signatureProvider.notifier).setBgRemoval(v),
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),
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const Text('Background removal'),
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],
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),
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Row(
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children: [
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const Text('Contrast'),
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Expanded(
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child: Slider(
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key: const Key('sld_contrast'),
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min: 0.0,
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max: 2.0,
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value: sig.contrast,
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onChanged:
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(v) => ref.read(signatureProvider.notifier).setContrast(v),
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),
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),
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Text(sig.contrast.toStringAsFixed(2)),
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],
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),
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Row(
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children: [
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const Text('Brightness'),
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Expanded(
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child: Slider(
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key: const Key('sld_brightness'),
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min: -1.0,
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max: 1.0,
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value: sig.brightness,
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onChanged:
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(v) =>
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ref.read(signatureProvider.notifier).setBrightness(v),
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),
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),
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Text(sig.brightness.toStringAsFixed(2)),
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],
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),
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],
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);
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}
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}
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