feat: add pin lock / fix performance on history view
This commit is contained in:
@@ -0,0 +1,331 @@
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import 'package:flutter/material.dart';
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import 'package:provider/provider.dart';
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import '../viewmodels/pin_lock_view_model.dart';
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enum PinEntryMode { unlock, create }
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const _pinLength = 4;
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/// Full-screen PIN entry. In [PinEntryMode.unlock] it verifies a PIN
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/// against the one already saved. In [PinEntryMode.create] it walks the
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/// person through entering a new PIN twice before saving it.
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class PinEntryView extends StatefulWidget {
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final PinEntryMode mode;
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final VoidCallback? onSuccess;
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const PinEntryView({
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super.key,
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required this.mode,
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this.onSuccess,
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});
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@override
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State<PinEntryView> createState() => _PinEntryViewState();
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}
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class _PinEntryViewState extends State<PinEntryView> {
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String _digits = '';
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String? _firstEntry;
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bool _isConfirmStep = false;
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bool _isSubmitting = false;
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String? _localError;
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bool _shake = false;
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bool get _isCreateFlow => widget.mode == PinEntryMode.create;
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String get _title {
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if (!_isCreateFlow) return 'Enter PIN';
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return _isConfirmStep ? 'Confirm PIN' : 'Create a PIN';
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}
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String? get _subtitle {
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if (!_isCreateFlow) return null;
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return _isConfirmStep
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? 'Enter the same PIN again'
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: 'Youʼll use this to unlock the app';
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}
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void _onDigitPressed(String digit) {
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if (_isSubmitting || _digits.length >= _pinLength) return;
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setState(() {
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_digits += digit;
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_localError = null;
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});
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if (_digits.length == _pinLength) {
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_handleComplete();
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}
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}
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void _onBackspacePressed() {
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if (_isSubmitting || _digits.isEmpty) return;
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setState(() {
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_digits = _digits.substring(0, _digits.length - 1);
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});
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}
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Future<void> _handleComplete() async {
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final viewModel = context.read<PinLockViewModel>();
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if (_isCreateFlow && !_isConfirmStep) {
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// First entry of a new PIN — stash it, then ask for confirmation.
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final entered = _digits;
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setState(() {
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_firstEntry = entered;
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_isConfirmStep = true;
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_digits = '';
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});
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return;
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}
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if (_isCreateFlow && _isConfirmStep) {
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if (_digits != _firstEntry) {
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setState(() {
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_firstEntry = null;
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_isConfirmStep = false;
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});
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_fail('PINs didnʼt match. Try again.');
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return;
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}
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setState(() => _isSubmitting = true);
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final ok = await viewModel.setPin(_digits);
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if (!mounted) return;
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setState(() => _isSubmitting = false);
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if (ok) {
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widget.onSuccess?.call();
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} else {
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setState(() {
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_firstEntry = null;
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_isConfirmStep = false;
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});
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_fail(viewModel.errorMessage ?? 'Something went wrong.');
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}
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return;
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}
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// Unlock flow.
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setState(() => _isSubmitting = true);
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final ok = await viewModel.verify(_digits);
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if (!mounted) return;
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setState(() => _isSubmitting = false);
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if (ok) {
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widget.onSuccess?.call();
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} else {
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_fail(viewModel.errorMessage ?? 'Incorrect PIN.');
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}
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}
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void _fail(String message) {
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setState(() {
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_localError = message;
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_digits = '';
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_shake = true;
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});
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Future.delayed(const Duration(milliseconds: 350), () {
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if (mounted) setState(() => _shake = false);
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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 scheme = Theme.of(context).colorScheme;
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return Scaffold(
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body: SafeArea(
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child: Padding(
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padding: const EdgeInsets.symmetric(horizontal: 24),
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child: Column(
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children: [
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const Spacer(flex: 2),
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Icon(Icons.lock_outline_rounded, size: 36, color: scheme.primary),
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const SizedBox(height: 16),
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Text(_title, style: Theme.of(context).textTheme.headlineMedium),
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if (_subtitle != null) ...[
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const SizedBox(height: 6),
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Text(
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_subtitle!,
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textAlign: TextAlign.center,
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style: Theme.of(context).textTheme.bodyMedium,
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),
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],
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const SizedBox(height: 28),
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AnimatedContainer(
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duration: const Duration(milliseconds: 60),
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transform: Matrix4.translationValues(_shake ? 8 : 0, 0, 0),
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child: _PinDots(filled: _digits.length, total: _pinLength),
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),
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const SizedBox(height: 16),
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SizedBox(
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height: 20,
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child: _localError != null
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? Text(
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_localError!,
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style: TextStyle(color: scheme.error, fontSize: 13),
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)
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: const SizedBox.shrink(),
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),
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const Spacer(flex: 2),
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_PinKeypad(
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enabled: !_isSubmitting,
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onDigit: _onDigitPressed,
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onBackspace: _onBackspacePressed,
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),
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const Spacer(),
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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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class _PinDots extends StatelessWidget {
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final int filled;
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final int total;
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const _PinDots({required this.filled, required this.total});
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@override
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Widget build(BuildContext context) {
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final scheme = Theme.of(context).colorScheme;
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return Row(
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mainAxisSize: MainAxisSize.min,
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children: List.generate(total, (index) {
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final isFilled = index < filled;
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return Container(
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margin: const EdgeInsets.symmetric(horizontal: 8),
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width: 16,
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height: 16,
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decoration: BoxDecoration(
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shape: BoxShape.circle,
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color: isFilled ? scheme.primary : Colors.transparent,
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border: Border.all(
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color: isFilled ? scheme.primary : scheme.onSurface.withOpacity(0.3),
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width: 1.4,
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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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class _PinKeypad extends StatelessWidget {
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final bool enabled;
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final ValueChanged<String> onDigit;
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final VoidCallback onBackspace;
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const _PinKeypad({
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required this.enabled,
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required this.onDigit,
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required this.onBackspace,
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});
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static const _rows = [
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['1', '2', '3'],
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['4', '5', '6'],
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['7', '8', '9'],
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];
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@override
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Widget build(BuildContext context) {
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return Column(
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mainAxisSize: MainAxisSize.min,
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children: [
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for (final row in _rows)
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Padding(
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padding: const EdgeInsets.symmetric(vertical: 6),
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child: Row(
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spacing: 16,
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mainAxisAlignment: MainAxisAlignment.center,
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children: [
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for (final digit in row)
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_KeypadButton(
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label: digit,
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onTap: enabled ? () => onDigit(digit) : null,
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),
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],
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),
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),
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Padding(
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padding: const EdgeInsets.symmetric(vertical: 6),
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child: Row(
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spacing: 16,
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mainAxisAlignment: MainAxisAlignment.center,
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children: [
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const _KeypadButton(isSpacer: true, onTap: null),
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_KeypadButton(
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label: '0',
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onTap: enabled ? () => onDigit('0') : null,
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),
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_KeypadButton(
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icon: Icons.backspace_outlined,
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onTap: enabled ? onBackspace : null,
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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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class _KeypadButton extends StatelessWidget {
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final String? label;
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final IconData? icon;
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final VoidCallback? onTap;
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final bool isSpacer;
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const _KeypadButton({
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this.label,
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this.icon,
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required this.onTap,
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this.isSpacer = false,
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});
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@override
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Widget build(BuildContext context) {
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if (isSpacer) {
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return const SizedBox(width: 72, height: 72);
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}
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final scheme = Theme.of(context).colorScheme;
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return SizedBox(
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width: 72,
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height: 72,
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child: Material(
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color: scheme.onSurface.withOpacity(0.04),
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shape: const CircleBorder(),
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child: InkWell(
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customBorder: const CircleBorder(),
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onTap: onTap,
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child: Center(
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child: icon != null
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? Icon(icon, color: scheme.onSurface.withOpacity(0.8))
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: Text(
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label!,
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style: TextStyle(
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fontSize: 24,
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fontWeight: FontWeight.w600,
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color: onTap == null
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? scheme.onSurface.withOpacity(0.3)
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: scheme.onSurface,
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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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