621 lines
21 KiB
Dart
621 lines
21 KiB
Dart
import 'package:cross_file/cross_file.dart';
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import 'package:file_picker/file_picker.dart' as fp;
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import 'package:flutter/foundation.dart';
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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:pdf_signature/data/repositories/preferences_repository.dart';
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import 'package:pdf_signature/l10n/app_localizations.dart';
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import 'package:multi_split_view/multi_split_view.dart';
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import 'package:pdfrx/pdfrx.dart';
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import 'draw_canvas.dart';
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import 'pdf_toolbar.dart';
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import 'pdf_page_area.dart';
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import 'pages_sidebar.dart';
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import 'signatures_sidebar.dart';
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import '../view_model/pdf_export_view_model.dart';
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import 'package:pdf_signature/utils/download.dart';
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import '../view_model/pdf_view_model.dart';
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import 'package:image/image.dart' as img;
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import 'package:pdf_signature/data/repositories/document_repository.dart';
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import 'package:responsive_framework/responsive_framework.dart';
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class PdfSignatureHomePage extends ConsumerStatefulWidget {
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final Future<void> Function() onPickPdf;
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final VoidCallback onClosePdf;
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final XFile currentFile;
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// Optional display name for the currently opened file. On Linux
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// xdg-desktop-portal, XFile.name/path can be a UUID-like value. When
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// available, this name preserves the user-selected filename so we can
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// suggest a proper "signed_*.pdf" on save.
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final String? currentFileName;
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// Optional listener for underlying Pdfrx document change events.
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final void Function(PdfDocument?)? onDocumentChanged;
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const PdfSignatureHomePage({
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super.key,
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required this.onPickPdf,
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required this.onClosePdf,
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required this.currentFile,
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this.currentFileName,
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this.onDocumentChanged,
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});
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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 = Size(676, 960 / 1.4142);
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bool _showPagesSidebar = true;
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bool _showSignaturesSidebar = true;
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int _zoomLevel = 100; // percentage for display only
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// Split view controller to manage resizable sidebars without remounting the center area.
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late final MultiSplitViewController _splitController;
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late final List<Area> _areas;
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double _lastPagesWidth = 160;
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double _lastSignaturesWidth = 220;
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// Configurable sidebar constraints
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final double _pagesMin = 100;
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final double _pagesMax = 250;
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final double _signaturesMin = 140;
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final double _signaturesMax = 250;
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late PdfViewModel _viewModel;
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bool? _lastCanShowPagesSidebar;
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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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ScaffoldMessenger.of(context).showSnackBar(
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SnackBar(
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content: Text(AppLocalizations.of(context).invalidOrUnsupportedFile),
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),
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);
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}
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Future<void> _pickPdf() async {
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await widget.onPickPdf();
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}
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void _closePdf() {
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widget.onClosePdf();
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}
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void _jumpToPage(int page) {
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final controller = _viewModel.controller;
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final current = _viewModel.currentPage;
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final pdf = _viewModel.document;
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int target;
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if (page == -1) {
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target = (current - 1).clamp(1, pdf.pageCount);
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} else {
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target = page.clamp(1, pdf.pageCount);
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}
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// Update reactive page providers so UI/tests reflect navigation even if controller is a stub
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if (current != target) {
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// Also notify view model (if used elsewhere) via its public API
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try {
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_viewModel.jumpToPage(target);
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} catch (_) {
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// ignore if provider not available
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}
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}
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if (controller.isReady) controller.goToPage(pageNumber: target);
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}
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img.Image? _toStdSignatureImage(img.Image? image) {
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if (image == null) return null;
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image.convert(numChannels: 4);
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// Scale down if height > 256 to improve performance
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if (image.height > 256) {
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final newWidth = (image.width * 256) ~/ image.height;
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image = img.copyResize(image, width: newWidth, height: 256);
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}
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return image;
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}
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Future<img.Image?> _loadSignatureFromFile() async {
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final result = await fp.FilePicker.platform.pickFiles(
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type: fp.FileType.custom,
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allowedExtensions: const ['png', 'jpg', 'jpeg', 'webp'],
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withData: true,
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);
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if (result == null || result.files.isEmpty) return null;
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final picked = result.files.single;
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final Uint8List? bytes =
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picked.bytes ??
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(picked.path != null ? await XFile(picked.path!).readAsBytes() : null);
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try {
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if (bytes == null) return null;
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var sigImage = img.decodeImage(bytes);
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return _toStdSignatureImage(sigImage);
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} catch (_) {
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return null;
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}
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}
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Future<img.Image?> _openDrawCanvas() async {
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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.isEmpty) return null;
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// In simplified UI, adding to library isn't implemented
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try {
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var sigImage = img.decodeImage(result);
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return _toStdSignatureImage(sigImage);
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} catch (_) {
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return null;
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}
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}
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Future<void> _saveSignedPdf() async {
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// Show exporting overlay and then run the heavy work asynchronously so
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// the UI thread remains responsive to gestures like page navigation.
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ref.read(pdfExportViewModelProvider.notifier).setExporting(true);
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// ignore: avoid_print
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debugPrint('_saveSignedPdf: exporting flag set true');
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final weakContext = context;
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Future<void>(() async {
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try {
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// ignore: avoid_print
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debugPrint('_saveSignedPdf: async export task started');
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final pdf = _viewModel.document;
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final messenger = ScaffoldMessenger.of(weakContext);
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if (!pdf.loaded) {
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// ignore: avoid_print
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debugPrint('_saveSignedPdf: document not loaded');
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messenger.showSnackBar(
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SnackBar(
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content: Text(AppLocalizations.of(weakContext).nothingToSaveYet),
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),
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);
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return;
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}
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// get DPI from preferences
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final targetDpi = ref.read(preferencesRepositoryProvider).exportDpi;
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bool ok = false;
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String? savedPath;
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// Derive a suggested filename based on the opened file.
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final display = widget.currentFileName;
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final originalName =
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(display != null && display.trim().isNotEmpty)
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? display.trim()
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: widget.currentFile.name.isNotEmpty
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? widget.currentFile.name
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: widget.currentFile.path.isNotEmpty
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? widget.currentFile.path.split('/').last.split('\\').last
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: 'document.pdf';
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final suggested = _suggestSignedName(originalName);
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if (!kIsWeb) {
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final path = await ref
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.read(pdfExportViewModelProvider)
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.pickSavePathWithSuggestedName(suggested);
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if (path == null || path.trim().isEmpty) return;
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final fullPath = _ensurePdfExtension(path.trim());
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savedPath = fullPath;
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// ignore: avoid_print
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debugPrint('_saveSignedPdf: picked save path ' + fullPath);
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ok = await ref
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.read(pdfExportViewModelProvider)
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.exportToPath(
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outputPath: fullPath,
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uiPageSize: _pageSize,
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signatureImageBytes: null,
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targetDpi: targetDpi,
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);
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// ignore: avoid_print
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debugPrint('_saveSignedPdf: saveBytesToFile ok=' + ok.toString());
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} else {
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// Web: export and trigger browser download
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final out = await ref
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.read(documentRepositoryProvider.notifier)
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.exportDocumentToBytes(
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uiPageSize: _pageSize,
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signatureImageBytes: null,
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targetDpi: targetDpi,
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);
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if (out != null) {
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ok = await downloadBytes(out, filename: suggested);
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savedPath = suggested;
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} else {
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debugPrint('_saveSignedPdf: export to bytes failed');
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}
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}
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if (!kIsWeb) {
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messenger.showSnackBar(
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SnackBar(
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content: Text(
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ok
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? AppLocalizations.of(
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weakContext,
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).savedWithPath(savedPath ?? '')
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: AppLocalizations.of(weakContext).failedToSavePdf,
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),
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),
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);
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debugPrint('_saveSignedPdf: SnackBar shown ok=' + ok.toString());
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} else {
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messenger.showSnackBar(
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SnackBar(
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content: Text(
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ok
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? AppLocalizations.of(
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weakContext,
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).savedWithPath(savedPath ?? 'signed.pdf')
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: AppLocalizations.of(weakContext).failedToSavePdf,
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),
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),
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);
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}
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} finally {
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if (mounted) {
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ref.read(pdfExportViewModelProvider.notifier).setExporting(false);
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// ignore: avoid_print
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debugPrint('_saveSignedPdf: exporting flag set false');
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}
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}
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});
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}
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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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String _suggestSignedName(String original) {
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// Normalize to a base filename
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final base = original.split('/').last.split('\\').last;
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if (base.toLowerCase().endsWith('.pdf')) {
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return 'signed_' + base;
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}
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return 'signed_' + base + '.pdf';
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}
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void _onControllerChanged() {
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if (mounted) {
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if (_viewModel.controller.isReady) {
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final newZoomLevel = (_viewModel.controller.currentZoom * 100)
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.round()
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.clamp(10, 800);
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if (newZoomLevel != _zoomLevel) {
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setState(() {
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_zoomLevel = newZoomLevel;
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});
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}
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} else {
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// Reset to default zoom level when controller is not ready
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if (_zoomLevel != 100) {
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setState(() {
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_zoomLevel = 100;
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});
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}
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}
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}
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}
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@override
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void initState() {
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super.initState();
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// Build areas once with builders; keep these instances stable.
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_viewModel = ref.read(pdfViewModelProvider.notifier);
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// Add listener to update zoom level when controller zoom changes
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_viewModel.controller.addListener(_onControllerChanged);
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_areas = [
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Area(
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size: _lastPagesWidth,
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min: _pagesMin,
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max: _pagesMax,
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builder:
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(context, area) => Offstage(
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offstage: () {
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try {
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return !(ResponsiveBreakpoints.of(
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context,
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).largerThan(MOBILE) &&
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_showPagesSidebar);
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} catch (_) {
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// In test environments without ResponsiveBreakpoints, default to showing
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return !_showPagesSidebar;
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}
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}(),
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child: Consumer(
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builder: (context, ref, child) {
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final pdfViewModel = ref.watch(pdfViewModelProvider);
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final pdf = pdfViewModel.document;
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final documentRef =
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pdf.loaded && pdf.pickedPdfBytes != null
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? PdfDocumentRefData(
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pdf.pickedPdfBytes!,
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sourceName: pdfViewModel.documentSourceName,
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)
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: null;
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return PagesSidebar(
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documentRef: documentRef,
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controller: _viewModel.controller,
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currentPage: _viewModel.currentPage,
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);
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},
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),
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),
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),
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Area(
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flex: 1,
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builder:
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(context, area) => RepaintBoundary(
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child: PdfPageArea(
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controller: _viewModel.controller,
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key: const ValueKey('pdf_page_area'),
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pageSize: _pageSize,
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onDocumentChanged: widget.onDocumentChanged,
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),
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),
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),
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Area(
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size: _lastSignaturesWidth,
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min: _signaturesMin,
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max: _signaturesMax,
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builder:
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(context, area) => Offstage(
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offstage: !_showSignaturesSidebar,
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child: SignaturesSidebar(
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onLoadSignatureFromFile: _loadSignatureFromFile,
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onOpenDrawCanvas: _openDrawCanvas,
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onSave: _saveSignedPdf,
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),
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),
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),
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];
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_splitController = MultiSplitViewController(areas: _areas);
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// Apply initial collapse if needed
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_applySidebarVisibility();
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}
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@override
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void didChangeDependencies() {
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super.didChangeDependencies();
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// Detect breakpoint changes from Responsive Framework and update areas once.
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bool canShowPagesSidebar = true;
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try {
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canShowPagesSidebar = ResponsiveBreakpoints.of(
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context,
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).largerThan(MOBILE);
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} catch (_) {
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canShowPagesSidebar = true;
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}
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if (_lastCanShowPagesSidebar != canShowPagesSidebar) {
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_lastCanShowPagesSidebar = canShowPagesSidebar;
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_applySidebarVisibility();
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}
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}
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@override
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void dispose() {
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_viewModel.controller.removeListener(_onControllerChanged);
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_splitController.dispose();
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super.dispose();
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}
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void _applySidebarVisibility() {
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// Respect responsive layout: disable Pages sidebar on MOBILE.
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bool canShowPagesSidebar = true;
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try {
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canShowPagesSidebar = ResponsiveBreakpoints.of(
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context,
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).largerThan(MOBILE);
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} catch (_) {
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// If ResponsiveBreakpoints isn't available yet (e.g., during early init),
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// fall back to allowing sidebars to avoid crashes; builders also guard.
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canShowPagesSidebar = true;
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}
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// Left pages sidebar
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final left = _splitController.areas[0];
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final wantPagesVisible = _showPagesSidebar && canShowPagesSidebar;
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final isPagesHidden =
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(left.max == 1 && left.min == 0 && (left.size ?? 1) == 1);
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if (wantPagesVisible) {
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// Only expand if currently hidden; otherwise keep user's size.
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if (isPagesHidden) {
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left.max = _pagesMax;
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left.min = _pagesMin;
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left.size = _lastPagesWidth.clamp(_pagesMin, _pagesMax);
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} else {
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left.max = _pagesMax;
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left.min = _pagesMin;
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// Preserve current size (user may have adjusted it).
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_lastPagesWidth = left.size ?? _lastPagesWidth;
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}
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} else {
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// Only collapse if currently visible; remember current size for restore.
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if (!isPagesHidden) {
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_lastPagesWidth = left.size ?? _lastPagesWidth;
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left.min = 0;
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left.max = 1;
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left.size = 1; // effectively hidden
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}
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}
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// Right signatures sidebar
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final right = _splitController.areas[2];
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final isSignaturesHidden =
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(right.max == 1 && right.min == 0 && (right.size ?? 1) == 1);
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if (_showSignaturesSidebar) {
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if (isSignaturesHidden) {
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right.max = _signaturesMax;
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right.min = _signaturesMin;
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right.size = _lastSignaturesWidth.clamp(_signaturesMin, _signaturesMax);
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} else {
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right.max = _signaturesMax;
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right.min = _signaturesMin;
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_lastSignaturesWidth = right.size ?? _lastSignaturesWidth;
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}
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} else {
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if (!isSignaturesHidden) {
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_lastSignaturesWidth = right.size ?? _lastSignaturesWidth;
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right.min = 0;
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right.max = 1;
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right.size = 1;
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}
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}
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}
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@override
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Widget build(BuildContext context) {
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return _buildScaffold(context);
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}
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Widget _buildScaffold(BuildContext context) {
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final isExporting = ref.watch(pdfExportViewModelProvider).exporting;
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final l = AppLocalizations.of(context);
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// Defensive flag for tests not wrapped in ResponsiveBreakpoints
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bool largerThanMobile;
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try {
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largerThanMobile = ResponsiveBreakpoints.of(context).largerThan(MOBILE);
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} catch (_) {
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largerThanMobile = true;
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}
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return Scaffold(
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body: Padding(
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padding: const EdgeInsets.all(12),
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child: Stack(
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children: [
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Column(
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children: [
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// Full-width toolbar row
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PdfToolbar(
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|
disabled: isExporting,
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onPickPdf: _pickPdf,
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onClosePdf: _closePdf,
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onJumpToPage: _jumpToPage,
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onZoomOut: () {
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if (_viewModel.controller.isReady) {
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_viewModel.controller.zoomDown();
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// Update display zoom level after controller zoom
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WidgetsBinding.instance.addPostFrameCallback((_) {
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if (mounted) {
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setState(() {
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_zoomLevel = (_viewModel.controller.currentZoom *
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100)
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.round()
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.clamp(10, 800);
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});
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}
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});
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}
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},
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onZoomIn: () {
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if (_viewModel.controller.isReady) {
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_viewModel.controller.zoomUp();
|
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// Update display zoom level after controller zoom
|
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WidgetsBinding.instance.addPostFrameCallback((_) {
|
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if (mounted) {
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setState(() {
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_zoomLevel = (_viewModel.controller.currentZoom *
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100)
|
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.round()
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.clamp(10, 800);
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});
|
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}
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});
|
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}
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},
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zoomLevel: _zoomLevel,
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filePath: widget.currentFile.path,
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showPagesSidebar: _showPagesSidebar,
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showSignaturesSidebar: _showSignaturesSidebar,
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onTogglePagesSidebar:
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() => setState(() {
|
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_showPagesSidebar = !_showPagesSidebar;
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_applySidebarVisibility();
|
|
}),
|
|
onToggleSignaturesSidebar:
|
|
() => setState(() {
|
|
_showSignaturesSidebar = !_showSignaturesSidebar;
|
|
_applySidebarVisibility();
|
|
}),
|
|
),
|
|
// Optional quick toggle for pages sidebar on larger screens
|
|
if (largerThanMobile)
|
|
Align(
|
|
alignment: Alignment.centerLeft,
|
|
child: SizedBox(
|
|
height: 0,
|
|
width: 0,
|
|
child: Offstage(
|
|
offstage: true,
|
|
child: IconButton(
|
|
key: const Key('btn_toggle_pages_sidebar_hidden'),
|
|
onPressed: () {
|
|
setState(() {
|
|
_showPagesSidebar = !_showPagesSidebar;
|
|
_applySidebarVisibility();
|
|
});
|
|
},
|
|
icon: const Icon(Icons.view_sidebar),
|
|
),
|
|
),
|
|
),
|
|
),
|
|
// Expose a compact signature drawer trigger area for tests when sidebar hidden
|
|
if (!_showSignaturesSidebar)
|
|
Align(
|
|
alignment: Alignment.centerLeft,
|
|
child: SizedBox(
|
|
height:
|
|
0, // zero-height container exposing buttons offstage
|
|
width: 0,
|
|
child: Offstage(
|
|
offstage: true,
|
|
child: SignaturesSidebar(
|
|
onLoadSignatureFromFile: _loadSignatureFromFile,
|
|
onOpenDrawCanvas: _openDrawCanvas,
|
|
onSave: _saveSignedPdf,
|
|
),
|
|
),
|
|
),
|
|
),
|
|
const SizedBox(height: 8),
|
|
Expanded(
|
|
child: MultiSplitView(
|
|
controller: _splitController,
|
|
axis: Axis.horizontal,
|
|
),
|
|
),
|
|
],
|
|
),
|
|
if (isExporting)
|
|
Positioned.fill(
|
|
child: Container(
|
|
color: Colors.black45,
|
|
child: Center(
|
|
child: Column(
|
|
mainAxisSize: MainAxisSize.min,
|
|
children: [
|
|
const CircularProgressIndicator(),
|
|
const SizedBox(height: 12),
|
|
Text(
|
|
l.exportingPleaseWait,
|
|
style: const TextStyle(color: Colors.white),
|
|
),
|
|
],
|
|
),
|
|
),
|
|
),
|
|
),
|
|
],
|
|
),
|
|
),
|
|
);
|
|
}
|
|
}
|