Documentação
This commit is contained in:
Carlos Correia
326
lib/quiz/quiz_question_screen.dart
Normal file
326
lib/quiz/quiz_question_screen.dart
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@@ -0,0 +1,326 @@
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import 'dart:math' as math;
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import 'package:flutter/material.dart';
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import 'package:lottie/lottie.dart';
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typedef QuizNextBuilder = Route<void> Function(BuildContext context, int nextScore);
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class QuizAnswer {
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const QuizAnswer({required this.title, required this.description, required this.weight});
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final String title;
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final String description;
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final int weight;
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}
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class QuizQuestionScreen extends StatefulWidget {
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const QuizQuestionScreen({
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super.key,
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required this.title,
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required this.question,
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required this.answers,
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required this.nextRoute,
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this.currentScore = 0,
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this.onFinished,
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this.isFinal = false,
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this.showBackButton = false,
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});
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final String title;
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final String question;
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final List<QuizAnswer> answers;
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final QuizNextBuilder nextRoute;
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final int currentScore;
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final VoidCallback? onFinished;
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final bool isFinal;
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final bool showBackButton;
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@override
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State<QuizQuestionScreen> createState() => _QuizQuestionScreenState();
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}
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class _QuizQuestionScreenState extends State<QuizQuestionScreen> {
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int? _selected;
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@override
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Widget build(BuildContext context) {
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final size = MediaQuery.sizeOf(context);
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final bool canProceed = _selected != null;
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return Scaffold(
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body: Stack(
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clipBehavior: Clip.none,
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children: [
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Positioned.fill(
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child: Container(
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decoration: const BoxDecoration(
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gradient: LinearGradient(
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begin: Alignment.topCenter,
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end: Alignment.bottomCenter,
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colors: [
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Color(0xFFFFE6F1),
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Color(0xFFFFC9DF),
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],
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),
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),
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),
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),
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Positioned(
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left: -size.width * 0.40,
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bottom: -size.width * 0.45,
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child: IgnorePointer(
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child: SizedBox(
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width: size.width * 1.05,
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height: size.width * 1.05,
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child: Transform.rotate(
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angle: 35 * math.pi / 180,
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child: Opacity(
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opacity: 0.95,
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child: Lottie.asset(
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'lottie/Liquid waves.json',
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fit: BoxFit.cover,
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repeat: true,
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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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SafeArea(
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child: Center(
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child: ConstrainedBox(
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constraints: const BoxConstraints(maxWidth: 520),
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child: Column(
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crossAxisAlignment: CrossAxisAlignment.stretch,
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children: [
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Padding(
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padding: const EdgeInsets.fromLTRB(20, 18, 20, 10),
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child: Column(
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crossAxisAlignment: CrossAxisAlignment.stretch,
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children: [
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Text(
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widget.title,
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textAlign: TextAlign.center,
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style: TextStyle(
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color: Colors.black.withValues(alpha: 0.55),
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fontWeight: FontWeight.w800,
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),
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),
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const SizedBox(height: 6),
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Text(
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widget.question,
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textAlign: TextAlign.center,
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style: const TextStyle(
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fontSize: 18,
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fontWeight: FontWeight.w900,
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color: Color(0xFFFF55A7),
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height: 1.2,
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),
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),
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const SizedBox(height: 8),
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Text(
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'Escolha apenas uma opção',
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textAlign: TextAlign.center,
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style: TextStyle(
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color: Colors.black.withValues(alpha: 0.55),
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fontWeight: FontWeight.w700,
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),
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),
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],
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),
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),
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Expanded(
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child: Padding(
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padding: const EdgeInsets.symmetric(horizontal: 20),
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child: ListView.separated(
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padding: const EdgeInsets.only(bottom: 12),
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itemCount: widget.answers.length,
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separatorBuilder: (context, index) => const SizedBox(height: 12),
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itemBuilder: (context, i) {
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return _QuizAnswerTile(
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answer: widget.answers[i],
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selected: _selected == i,
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onTap: () => setState(() => _selected = i),
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);
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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.fromLTRB(20, 8, 20, 18),
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child: Column(
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children: [
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SizedBox(
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width: size.width * 0.62,
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height: 46,
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child: FilledButton(
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style: FilledButton.styleFrom(
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backgroundColor: const Color(0xFF2F9E94),
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foregroundColor: Colors.white,
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shape: const StadiumBorder(),
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textStyle: const TextStyle(fontWeight: FontWeight.w900),
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).copyWith(
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animationDuration: const Duration(milliseconds: 180),
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splashFactory: InkSparkle.splashFactory,
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overlayColor: WidgetStateProperty.resolveWith<Color?>(
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(states) {
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if (states.contains(WidgetState.pressed)) {
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return Colors.white.withValues(alpha: 0.14);
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}
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if (states.contains(WidgetState.hovered) || states.contains(WidgetState.focused)) {
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return Colors.white.withValues(alpha: 0.08);
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}
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return null;
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},
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),
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),
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onPressed: !canProceed
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? null
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: () {
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final picked = widget.answers[_selected!];
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final nextScore = widget.currentScore + picked.weight;
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if (widget.isFinal) {
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widget.onFinished?.call();
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Navigator.of(context).popUntil((r) => r.isFirst);
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return;
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}
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Navigator.of(context).push(widget.nextRoute(context, nextScore));
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},
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child: Text(widget.isFinal ? 'Concluir' : 'Avançar'),
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),
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),
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if (widget.showBackButton) ...[
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const SizedBox(height: 10),
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SizedBox(
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width: size.width * 0.62,
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height: 42,
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child: FilledButton(
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style: FilledButton.styleFrom(
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backgroundColor: const Color(0xFF2F9E94),
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foregroundColor: Colors.white,
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shape: const StadiumBorder(),
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textStyle: const TextStyle(fontWeight: FontWeight.w900),
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).copyWith(
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animationDuration: const Duration(milliseconds: 180),
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splashFactory: InkSparkle.splashFactory,
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overlayColor: WidgetStateProperty.resolveWith<Color?>(
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(states) {
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if (states.contains(WidgetState.pressed)) {
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return Colors.white.withValues(alpha: 0.14);
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}
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if (states.contains(WidgetState.hovered) || states.contains(WidgetState.focused)) {
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return Colors.white.withValues(alpha: 0.08);
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}
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return null;
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},
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),
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),
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onPressed: () => Navigator.of(context).maybePop(),
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child: const Text('Voltar'),
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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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),
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);
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}
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}
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class _QuizAnswerTile extends StatelessWidget {
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const _QuizAnswerTile({required this.answer, required this.selected, required this.onTap});
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final QuizAnswer answer;
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final bool selected;
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final VoidCallback onTap;
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@override
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Widget build(BuildContext context) {
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final borderColor = selected ? const Color(0xFF2F9E94) : Colors.black.withValues(alpha: 0.12);
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final bg = selected ? Colors.white.withValues(alpha: 0.88) : Colors.white.withValues(alpha: 0.70);
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return AnimatedContainer(
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duration: const Duration(milliseconds: 220),
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curve: Curves.easeOutCubic,
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decoration: BoxDecoration(
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color: bg,
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borderRadius: BorderRadius.circular(16),
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border: Border.all(color: borderColor, width: selected ? 1.4 : 1.0),
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boxShadow: [
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BoxShadow(
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color: Colors.black.withValues(alpha: 0.06),
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blurRadius: 18,
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offset: const Offset(0, 10),
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),
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],
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),
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child: Material(
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color: Colors.transparent,
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child: InkWell(
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borderRadius: BorderRadius.circular(16),
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onTap: onTap,
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splashFactory: InkSparkle.splashFactory,
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child: Padding(
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padding: const EdgeInsets.symmetric(horizontal: 16, vertical: 14),
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child: Column(
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crossAxisAlignment: CrossAxisAlignment.start,
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children: [
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Row(
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children: [
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Expanded(
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child: Text(
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answer.title,
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style: const TextStyle(
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fontWeight: FontWeight.w900,
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fontSize: 15,
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color: Color(0xFF2F9E94),
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),
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),
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),
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AnimatedRotation(
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turns: selected ? 0.5 : 0.0,
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duration: const Duration(milliseconds: 220),
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curve: Curves.easeOutCubic,
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child: Icon(
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Icons.expand_more_rounded,
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color: Colors.black.withValues(alpha: 0.55),
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),
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),
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],
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),
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AnimatedCrossFade(
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firstChild: const SizedBox.shrink(),
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secondChild: Padding(
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padding: const EdgeInsets.only(top: 10),
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child: Text(
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answer.description,
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style: TextStyle(
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color: Colors.black.withValues(alpha: 0.72),
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fontWeight: FontWeight.w600,
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height: 1.25,
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),
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),
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),
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crossFadeState: selected ? CrossFadeState.showSecond : CrossFadeState.showFirst,
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duration: const Duration(milliseconds: 220),
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firstCurve: Curves.easeIn,
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secondCurve: Curves.easeOut,
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sizeCurve: Curves.easeOutCubic,
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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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