116 lines
3.7 KiB
Dart
116 lines
3.7 KiB
Dart
import 'dart:math' as math;
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import 'dart:typed_data';
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import 'package:flutter/material.dart';
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import 'package:pdf_signature/l10n/app_localizations.dart';
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import 'package:hand_signature/signature.dart' as hand;
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class DrawCanvas extends StatefulWidget {
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const DrawCanvas({
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super.key,
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this.control,
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this.onConfirm,
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this.debugBytesSink,
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});
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final hand.HandSignatureControl? control;
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final ValueChanged<Uint8List?>? onConfirm;
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// For tests: allows observing exported bytes without relying on Navigator
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@visibleForTesting
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final ValueNotifier<Uint8List?>? debugBytesSink;
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@override
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State<DrawCanvas> createState() => _DrawCanvasState();
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}
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class _DrawCanvasState extends State<DrawCanvas> {
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late final hand.HandSignatureControl _control =
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widget.control ??
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hand.HandSignatureControl(
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initialSetup: const hand.SignaturePathSetup(
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threshold: 3.0,
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smoothRatio: 0.7,
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velocityRange: 2.0,
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pressureRatio: 0.0,
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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 l = AppLocalizations.of(context);
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return SafeArea(
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child: Padding(
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padding: const EdgeInsets.all(12),
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child: Column(
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mainAxisSize: MainAxisSize.min,
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children: [
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Row(
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children: [
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ElevatedButton(
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key: const Key('btn_canvas_confirm'),
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onPressed: () async {
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// Export signature to PNG bytes
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final data = await _control.toImage(
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color: Colors.black,
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background: Colors.transparent,
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fit: true,
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width: 1024,
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height: 512,
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);
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final bytes = data?.buffer.asUint8List();
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widget.debugBytesSink?.value = bytes;
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if (widget.onConfirm != null) {
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widget.onConfirm!(bytes);
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} else {
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if (context.mounted) {
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Navigator.of(context).pop(bytes);
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}
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}
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},
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child: Text(l.confirm),
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),
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const SizedBox(width: 8),
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OutlinedButton(
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key: const Key('btn_canvas_undo'),
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onPressed: () => _control.stepBack(),
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child: Text(l.undo),
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),
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const SizedBox(width: 8),
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OutlinedButton(
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key: const Key('btn_canvas_clear'),
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onPressed: () => _control.clear(),
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child: Text(l.clear),
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),
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],
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),
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const SizedBox(height: 8),
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SizedBox(
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key: const Key('draw_canvas'),
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height: math.max(MediaQuery.of(context).size.height * 0.6, 350),
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child: AspectRatio(
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aspectRatio: 10 / 3,
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child: Container(
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constraints: const BoxConstraints.expand(),
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color: Colors.white,
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child: Listener(
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behavior: HitTestBehavior.opaque,
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onPointerDown: (_) {},
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child: hand.HandSignature(
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key: const Key('hand_signature_pad'),
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control: _control,
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drawer: const hand.ShapeSignatureDrawer(
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color: Colors.black,
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width: 1.5,
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maxWidth: 6.0,
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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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