753 lines
28 KiB
Dart
753 lines
28 KiB
Dart
import 'dart:math' as math;
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import 'dart:async';
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import 'dart:typed_data';
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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/l10n/app_localizations.dart';
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import 'package:pdfrx/pdfrx.dart';
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import '../../../../data/services/export_providers.dart';
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import '../../../../data/model/model.dart';
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import '../view_model/view_model.dart';
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import '../../../../data/services/preferences_providers.dart';
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import 'signature_drag_data.dart';
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import 'image_editor_dialog.dart';
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class PdfPageArea extends ConsumerStatefulWidget {
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const PdfPageArea({
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super.key,
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required this.pageSize,
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required this.onDragSignature,
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required this.onResizeSignature,
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required this.onConfirmSignature,
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required this.onClearActiveOverlay,
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required this.onSelectPlaced,
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this.viewerController,
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});
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final Size pageSize;
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final PdfViewerController? viewerController;
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final ValueChanged<Offset> onDragSignature;
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final ValueChanged<Offset> onResizeSignature;
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final VoidCallback onConfirmSignature;
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final VoidCallback onClearActiveOverlay;
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final ValueChanged<int?> onSelectPlaced;
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@override
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ConsumerState<PdfPageArea> createState() => _PdfPageAreaState();
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}
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class _PdfPageAreaState extends ConsumerState<PdfPageArea> {
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final Map<int, GlobalKey> _pageKeys = {};
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late final PdfViewerController _viewerController =
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widget.viewerController ?? PdfViewerController();
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// Guards to avoid scroll feedback between provider and viewer
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int? _programmaticTargetPage;
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bool _suppressProviderListen = false;
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int? _visiblePage; // last page reported by viewer
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int? _pendingPage; // pending target for mock ensureVisible retry
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int _scrollRetryCount = 0;
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static const int _maxScrollRetries = 50;
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@override
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void initState() {
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super.initState();
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// If app starts in continuous mode with a loaded PDF, ensure the viewer
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// is instructed to align to the provider's current page once ready.
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WidgetsBinding.instance.addPostFrameCallback((_) {
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if (!mounted) return;
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final mode = ref.read(pageViewModeProvider);
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final pdf = ref.read(pdfProvider);
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if (mode == 'continuous' && pdf.pickedPdfPath != null && pdf.loaded) {
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_scrollToPage(pdf.currentPage);
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}
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});
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}
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// No dispose required for PdfViewerController (managed by owner if any)
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GlobalKey _pageKey(int page) => _pageKeys.putIfAbsent(
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page,
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() => GlobalKey(debugLabel: 'cont_page_$page'),
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);
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void _scrollToPage(int page) {
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WidgetsBinding.instance.addPostFrameCallback((_) {
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if (!mounted) return;
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final pdf = ref.read(pdfProvider);
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final isContinuous = ref.read(pageViewModeProvider) == 'continuous';
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// Real continuous: drive via PdfViewerController
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if (pdf.pickedPdfPath != null && isContinuous) {
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if (_viewerController.isReady) {
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_programmaticTargetPage = page;
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// print("[DEBUG] viewerController Scrolling to page $page");
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_viewerController.goToPage(
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pageNumber: page,
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anchor: PdfPageAnchor.top,
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);
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// Fallback: if no onPageChanged arrives (e.g., same page), don't block future jumps
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// Use post-frame callbacks to avoid scheduling timers in tests.
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WidgetsBinding.instance.addPostFrameCallback((_) {
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if (!mounted) return;
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WidgetsBinding.instance.addPostFrameCallback((_) {
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if (!mounted) return;
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if (_programmaticTargetPage == page) {
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_programmaticTargetPage = null;
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}
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});
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});
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_pendingPage = null;
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_scrollRetryCount = 0;
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} else {
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_pendingPage = page;
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if (_scrollRetryCount < _maxScrollRetries) {
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_scrollRetryCount += 1;
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WidgetsBinding.instance.addPostFrameCallback((_) {
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if (!mounted) return;
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final p = _pendingPage;
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if (p == null) return;
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_scrollToPage(p);
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});
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}
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}
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return;
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}
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// print("[DEBUG] Mock Scrolling to page $page");
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// Mock continuous: try ensureVisible on the page container
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final ctx = _pageKey(page).currentContext;
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if (ctx != null) {
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try {
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final scrollable = Scrollable.of(ctx);
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final position = scrollable.position;
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final targetBox = ctx.findRenderObject() as RenderBox?;
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final scrollBox = scrollable.context.findRenderObject() as RenderBox?;
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if (targetBox != null && scrollBox != null) {
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final offsetInViewport = targetBox.localToGlobal(
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Offset.zero,
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ancestor: scrollBox,
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);
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final desiredTop = scrollBox.size.height * 0.1;
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final newPixels =
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(position.pixels + offsetInViewport.dy - desiredTop)
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.clamp(position.minScrollExtent, position.maxScrollExtent)
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.toDouble();
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position.jumpTo(newPixels);
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return;
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}
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} catch (_) {
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// Fallback to ensureVisible if any calculation fails
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Scrollable.ensureVisible(
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ctx,
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alignment: 0.1,
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duration: Duration.zero,
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curve: Curves.linear,
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);
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return;
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}
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return;
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}
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_pendingPage = page;
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if (_scrollRetryCount < _maxScrollRetries) {
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_scrollRetryCount += 1;
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WidgetsBinding.instance.addPostFrameCallback((_) {
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if (!mounted) return;
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final p = _pendingPage;
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if (p == null) return;
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_scrollToPage(p);
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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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Widget build(BuildContext context) {
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final pdf = ref.watch(pdfProvider);
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final pageViewMode = ref.watch(pageViewModeProvider);
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// React to provider currentPage changes (e.g., user tapped overview)
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ref.listen(pdfProvider, (prev, next) {
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final mode = ref.read(pageViewModeProvider);
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if (_suppressProviderListen) return;
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if (mode == 'continuous' && (prev?.currentPage != next.currentPage)) {
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final target = next.currentPage;
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// If we're already navigating to this target, ignore; otherwise allow new target.
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if (_programmaticTargetPage != null &&
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_programmaticTargetPage == target) {
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return;
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}
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// Only navigate if target differs from what viewer shows
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if (_visiblePage != target) {
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_scrollToPage(target);
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}
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}
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});
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// When switching to continuous, bring current page into view
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ref.listen<String>(pageViewModeProvider, (prev, next) {
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if (next == 'continuous') {
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// Skip initial auto-scroll in mock mode to avoid fighting with
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// early provider-driven jumps during tests.
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final isMock = ref.read(useMockViewerProvider);
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if (isMock) return;
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final p = ref.read(pdfProvider).currentPage;
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if (_visiblePage != p) {
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_scrollToPage(p);
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}
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}
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});
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if (!pdf.loaded) {
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return Center(child: Text(AppLocalizations.of(context).noPdfLoaded));
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}
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final useMock = ref.watch(useMockViewerProvider);
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final isContinuous = pageViewMode == 'continuous';
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// Mock continuous: ListView with prebuilt children, no controller
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if (useMock && isContinuous) {
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final count = pdf.pageCount > 0 ? pdf.pageCount : 1;
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return Builder(
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builder: (ctx) {
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// Defer processing of any pending jump until after the tree is mounted.
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if (_pendingPage != null) {
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WidgetsBinding.instance.addPostFrameCallback((_) {
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if (!mounted) return;
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final p = _pendingPage;
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if (p != null) {
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_pendingPage = null;
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_scrollRetryCount = 0;
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// Schedule via microtask to avoid test timers remaining pending
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scheduleMicrotask(() {
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if (!mounted) return;
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_scrollToPage(p);
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});
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}
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});
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}
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final content = SingleChildScrollView(
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key: const Key('pdf_continuous_mock_list'),
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padding: const EdgeInsets.symmetric(vertical: 8),
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child: Column(
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children: List.generate(count, (idx) {
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final pageNum = idx + 1;
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return Center(
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child: Padding(
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key: _pageKey(pageNum),
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padding: const EdgeInsets.symmetric(vertical: 8),
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child: AspectRatio(
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aspectRatio:
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widget.pageSize.width / widget.pageSize.height,
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child: Stack(
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key: ValueKey('page_stack_$pageNum'),
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children: [
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Container(
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color: Colors.grey.shade200,
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child: Center(
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child: Text(
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AppLocalizations.of(
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context,
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).pageInfo(pageNum, count),
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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(
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signatureVisibilityProvider,
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);
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return visible
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? _buildPageOverlays(
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context,
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ref,
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sig,
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pageNum,
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)
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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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return content;
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},
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);
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}
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// Real continuous mode (pdfrx): copy example patterns
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// https://github.com/espresso3389/pdfrx/blob/2cc32c1e2aa2a054602d20a5e7cf60bcc2d6a889/packages/pdfrx/example/viewer/lib/main.dart
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if (pdf.pickedPdfPath != null && isContinuous) {
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final viewer = PdfViewer.file(
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pdf.pickedPdfPath!,
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controller: _viewerController,
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params: PdfViewerParams(
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pageAnchor: PdfPageAnchor.top,
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keyHandlerParams: PdfViewerKeyHandlerParams(autofocus: true),
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maxScale: 8,
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scrollByMouseWheel: 0.6,
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// Add overlay scroll thumbs (vertical on right, horizontal on bottom)
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viewerOverlayBuilder:
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(context, size, handleLinkTap) => [
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PdfViewerScrollThumb(
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controller: _viewerController,
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orientation: ScrollbarOrientation.right,
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thumbSize: const Size(40, 24),
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thumbBuilder:
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(context, thumbSize, pageNumber, controller) => Container(
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color: Colors.black.withValues(alpha: 0.7),
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child: Center(
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child: Text(
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pageNumber.toString(),
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style: const TextStyle(color: Colors.white),
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),
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),
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),
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),
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PdfViewerScrollThumb(
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controller: _viewerController,
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orientation: ScrollbarOrientation.bottom,
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thumbSize: const Size(40, 24),
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thumbBuilder:
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(context, thumbSize, pageNumber, controller) => Container(
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color: Colors.black.withValues(alpha: 0.7),
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child: Center(
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child: Text(
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pageNumber.toString(),
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style: const TextStyle(color: Colors.white),
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),
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),
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),
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),
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],
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onViewerReady: (doc, controller) {
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if (pdf.pageCount != doc.pages.length) {
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ref.read(pdfProvider.notifier).setPageCount(doc.pages.length);
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}
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final target = _pendingPage ?? pdf.currentPage;
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_pendingPage = null;
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_scrollRetryCount = 0;
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// Defer navigation to the next frame to ensure controller state is fully ready.
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WidgetsBinding.instance.addPostFrameCallback((_) {
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if (!mounted) return;
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_scrollToPage(target);
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});
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},
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onPageChanged: (n) {
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if (n == null) return;
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_visiblePage = n;
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// Programmatic navigation: wait until target reached
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if (_programmaticTargetPage != null) {
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if (n == _programmaticTargetPage) {
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if (n != ref.read(pdfProvider).currentPage) {
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_suppressProviderListen = true;
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ref.read(pdfProvider.notifier).jumpTo(n);
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WidgetsBinding.instance.addPostFrameCallback((_) {
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_suppressProviderListen = false;
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});
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}
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_programmaticTargetPage = null;
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}
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return;
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}
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// User scroll -> reflect page to provider without re-triggering scroll
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if (n != ref.read(pdfProvider).currentPage) {
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_suppressProviderListen = true;
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ref.read(pdfProvider.notifier).jumpTo(n);
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WidgetsBinding.instance.addPostFrameCallback((_) {
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_suppressProviderListen = false;
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});
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}
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},
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),
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);
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// Accept drops of signature card over the viewer
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final drop = DragTarget<Object>(
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onWillAcceptWithDetails: (details) => details.data is SignatureDragData,
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onAcceptWithDetails: (details) {
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// Map the local position to UI page coordinates of the visible page
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final box = context.findRenderObject() as RenderBox?;
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if (box == null) return;
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final local = box.globalToLocal(details.offset);
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final size = box.size;
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// Assume drop targets the current visible page; compute relative center
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final cx = (local.dx / size.width) * widget.pageSize.width;
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final cy = (local.dy / size.height) * widget.pageSize.height;
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final data = details.data;
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if (data is SignatureDragData && data.assetId != null) {
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// Set current overlay to use this asset
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ref
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.read(signatureProvider.notifier)
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.setImageFromLibrary(assetId: data.assetId!);
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}
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ref.read(signatureProvider.notifier).placeAtCenter(Offset(cx, cy));
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ref
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.read(pdfProvider.notifier)
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.setSignedPage(ref.read(pdfProvider).currentPage);
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},
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builder:
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(context, candidateData, rejected) => Stack(
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fit: StackFit.expand,
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children: [
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viewer,
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if (candidateData.isNotEmpty)
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Container(color: Colors.blue.withValues(alpha: 0.08)),
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],
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),
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);
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return drop;
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}
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return const SizedBox.shrink();
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}
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// Context menu for already placed signatures
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void _showContextMenuForPlaced({
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required BuildContext context,
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required WidgetRef ref,
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required Offset globalPos,
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required int index,
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required int page,
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}) {
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final l = AppLocalizations.of(context);
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showMenu<String>(
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context: context,
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position: RelativeRect.fromLTRB(
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globalPos.dx,
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globalPos.dy,
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globalPos.dx,
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globalPos.dy,
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),
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items: [
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PopupMenuItem<String>(
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key: const Key('ctx_placed_delete'),
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value: 'delete',
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child: Text(l.delete),
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),
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const PopupMenuItem<String>(
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key: Key('ctx_placed_adjust'),
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value: 'adjust',
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child: Text('Adjust graphic'),
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),
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],
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).then((choice) {
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switch (choice) {
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case 'delete':
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ref
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.read(pdfProvider.notifier)
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.removePlacement(page: page, index: index);
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break;
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case 'adjust':
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showDialog(
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context: context,
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builder: (ctx) => const ImageEditorDialog(),
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);
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break;
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default:
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break;
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}
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});
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}
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Widget _buildPageOverlays(
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BuildContext context,
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WidgetRef ref,
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SignatureState sig,
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int pageNumber,
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) {
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final pdf = ref.watch(pdfProvider);
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final placed = pdf.placementsByPage[pageNumber] ?? const <Rect>[];
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final widgets = <Widget>[];
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for (int i = 0; i < placed.length; i++) {
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final r = placed[i];
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widgets.add(
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_buildSignatureOverlay(
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context,
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ref,
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sig,
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r,
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interactive: false,
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placedIndex: i,
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pageNumber: pageNumber,
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),
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);
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}
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// Only show the active (interactive) signature overlay on the current page
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// in continuous mode, so tests can reliably find a single overlay.
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if (sig.rect != null &&
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sig.editingEnabled &&
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(pdf.signedPage == null || pdf.signedPage == pageNumber) &&
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pdf.currentPage == pageNumber) {
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widgets.add(
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_buildSignatureOverlay(
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context,
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ref,
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sig,
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sig.rect!,
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interactive: true,
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pageNumber: pageNumber,
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),
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);
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}
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return Stack(children: widgets);
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}
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Widget _buildSignatureOverlay(
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BuildContext context,
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WidgetRef ref,
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SignatureState sig,
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Rect r, {
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bool interactive = true,
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int? placedIndex,
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required int pageNumber,
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}) {
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return LayoutBuilder(
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builder: (context, constraints) {
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final scaleX = constraints.maxWidth / widget.pageSize.width;
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final scaleY = constraints.maxHeight / widget.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: Builder(
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builder: (context) {
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final selectedIdx =
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ref.read(pdfProvider).selectedPlacementIndex;
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final bool isPlaced = placedIndex != null;
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final bool isSelected =
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isPlaced && selectedIdx == placedIndex;
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final Color borderColor =
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isPlaced ? Colors.red : Colors.indigo;
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final double borderWidth =
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isPlaced ? (isSelected ? 3.0 : 2.0) : 2.0;
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Widget content = DecoratedBox(
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decoration: BoxDecoration(
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color: Color.fromRGBO(
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0,
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0,
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0,
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|
0.05 + math.min(0.25, (sig.contrast - 1.0).abs()),
|
|
),
|
|
border: Border.all(
|
|
color: borderColor,
|
|
width: borderWidth,
|
|
),
|
|
),
|
|
child: Stack(
|
|
children: [
|
|
Consumer(
|
|
builder: (context, ref, _) {
|
|
Uint8List? bytes;
|
|
if (interactive) {
|
|
final processed = ref.watch(
|
|
processedSignatureImageProvider,
|
|
);
|
|
bytes = processed ?? sig.imageBytes;
|
|
} else if (placedIndex != null) {
|
|
// Use the image assigned to this placement
|
|
final imgId = ref
|
|
.read(pdfProvider)
|
|
.placementImageByPage[pageNumber]
|
|
?.elementAt(placedIndex);
|
|
if (imgId != null) {
|
|
final lib = ref.watch(signatureLibraryProvider);
|
|
for (final a in lib) {
|
|
if (a.id == imgId) {
|
|
bytes = a.bytes;
|
|
break;
|
|
}
|
|
}
|
|
}
|
|
// Fallback to current processed
|
|
bytes ??=
|
|
ref.read(processedSignatureImageProvider) ??
|
|
sig.imageBytes;
|
|
}
|
|
if (bytes == null) {
|
|
return Center(
|
|
child: Text(
|
|
AppLocalizations.of(context).signature,
|
|
),
|
|
);
|
|
}
|
|
Widget im = Image.memory(
|
|
bytes,
|
|
fit: BoxFit.contain,
|
|
);
|
|
if (sig.rotation % 360 != 0) {
|
|
im = Transform.rotate(
|
|
angle: sig.rotation * math.pi / 180.0,
|
|
child: im,
|
|
);
|
|
}
|
|
return im;
|
|
},
|
|
),
|
|
if (interactive)
|
|
Positioned(
|
|
right: 0,
|
|
bottom: 0,
|
|
child: GestureDetector(
|
|
key: const Key('signature_handle'),
|
|
behavior: HitTestBehavior.opaque,
|
|
onPanUpdate:
|
|
(d) => widget.onResizeSignature(
|
|
Offset(
|
|
d.delta.dx / scaleX,
|
|
d.delta.dy / scaleY,
|
|
),
|
|
),
|
|
child: const Icon(Icons.open_in_full, size: 20),
|
|
),
|
|
),
|
|
],
|
|
),
|
|
);
|
|
if (interactive && sig.editingEnabled) {
|
|
content = GestureDetector(
|
|
key: const Key('signature_overlay'),
|
|
behavior: HitTestBehavior.opaque,
|
|
onPanStart: (_) {},
|
|
onPanUpdate:
|
|
(d) => widget.onDragSignature(
|
|
Offset(d.delta.dx / scaleX, d.delta.dy / scaleY),
|
|
),
|
|
onSecondaryTapDown: (d) {
|
|
final pos = d.globalPosition;
|
|
showMenu<String>(
|
|
context: context,
|
|
position: RelativeRect.fromLTRB(
|
|
pos.dx,
|
|
pos.dy,
|
|
pos.dx,
|
|
pos.dy,
|
|
),
|
|
items: [
|
|
PopupMenuItem<String>(
|
|
key: Key('ctx_active_confirm'),
|
|
value: 'confirm',
|
|
child: Text(AppLocalizations.of(context).confirm),
|
|
),
|
|
PopupMenuItem<String>(
|
|
key: Key('ctx_active_delete'),
|
|
value: 'delete',
|
|
child: Text(AppLocalizations.of(context).delete),
|
|
),
|
|
const PopupMenuItem<String>(
|
|
key: Key('ctx_active_adjust'),
|
|
value: 'adjust',
|
|
child: Text('Adjust graphic'),
|
|
),
|
|
],
|
|
).then((choice) {
|
|
if (choice == 'confirm') {
|
|
widget.onConfirmSignature();
|
|
} else if (choice == 'delete') {
|
|
widget.onClearActiveOverlay();
|
|
} else if (choice == 'adjust') {
|
|
showDialog(
|
|
context: context,
|
|
builder: (_) => const ImageEditorDialog(),
|
|
);
|
|
}
|
|
});
|
|
},
|
|
onLongPressStart: (d) {
|
|
final pos = d.globalPosition;
|
|
showMenu<String>(
|
|
context: context,
|
|
position: RelativeRect.fromLTRB(
|
|
pos.dx,
|
|
pos.dy,
|
|
pos.dx,
|
|
pos.dy,
|
|
),
|
|
items: [
|
|
PopupMenuItem<String>(
|
|
key: Key('ctx_active_confirm_lp'),
|
|
value: 'confirm',
|
|
child: Text(AppLocalizations.of(context).confirm),
|
|
),
|
|
PopupMenuItem<String>(
|
|
key: Key('ctx_active_delete_lp'),
|
|
value: 'delete',
|
|
child: Text(AppLocalizations.of(context).delete),
|
|
),
|
|
const PopupMenuItem<String>(
|
|
key: Key('ctx_active_adjust_lp'),
|
|
value: 'adjust',
|
|
child: Text('Adjust graphic'),
|
|
),
|
|
],
|
|
).then((choice) {
|
|
if (choice == 'confirm') {
|
|
widget.onConfirmSignature();
|
|
} else if (choice == 'delete') {
|
|
widget.onClearActiveOverlay();
|
|
} else if (choice == 'adjust') {
|
|
showDialog(
|
|
context: context,
|
|
builder: (_) => const ImageEditorDialog(),
|
|
);
|
|
}
|
|
});
|
|
},
|
|
child: content,
|
|
);
|
|
} else {
|
|
content = GestureDetector(
|
|
key: Key('placed_signature_${placedIndex ?? 'x'}'),
|
|
behavior: HitTestBehavior.opaque,
|
|
onTap: () => widget.onSelectPlaced(placedIndex),
|
|
onSecondaryTapDown: (d) {
|
|
if (placedIndex != null) {
|
|
_showContextMenuForPlaced(
|
|
context: context,
|
|
ref: ref,
|
|
globalPos: d.globalPosition,
|
|
index: placedIndex,
|
|
page: pageNumber,
|
|
);
|
|
}
|
|
},
|
|
onLongPressStart: (d) {
|
|
if (placedIndex != null) {
|
|
_showContextMenuForPlaced(
|
|
context: context,
|
|
ref: ref,
|
|
globalPos: d.globalPosition,
|
|
index: placedIndex,
|
|
page: pageNumber,
|
|
);
|
|
}
|
|
},
|
|
child: content,
|
|
);
|
|
}
|
|
return content;
|
|
},
|
|
),
|
|
),
|
|
],
|
|
);
|
|
},
|
|
);
|
|
}
|
|
}
|
|
|
|
// Zoom controls removed with single-page mode; continuous viewer manages zoom.
|