yokutango-mobile-reader/lib/screens/flashcard.dart

import 'dart:math';

import 'package:tangocard_reader/components/flashcard.dart';
import 'package:tangocard_reader/models/yokutango_entry.dart';
import 'package:flutter/material.dart';
import 'package:flutter/services.dart';

class FlashcardView extends StatefulWidget {
  final List<YokutangoEntry> cards;
  final int? index;

  const FlashcardView({
    required this.cards,
    this.index,
    Key? key,
  }) : super(key: key);

  @override
  _FlashcardViewState createState() => _FlashcardViewState();
}

const encouragingWords = [
  '頑張れ〜！',
  'できるぞ！',
  'ヨッシャー！',
  'いけいけいけー！',
];

class _FlashcardViewState extends State<FlashcardView> {
  String title = '';
  int currentCard = 0;
  final List<bool> _isSelected = [false, false];

  get isShuffleMode => _isSelected[0];
  get isLanguageSwitchedMode => _isSelected[1];
  get randomCard => Random().nextInt(widget.cards.length);

  @override
  void initState() {
    title = encouragingWords[Random().nextInt(encouragingWords.length)];
    currentCard = widget.index ?? 0;

    final isPhone = MediaQueryData.fromWindow(WidgetsBinding.instance!.window)
            .size
            .shortestSide <
        600;
    if (isPhone) {
      SystemChrome.setPreferredOrientations([
        DeviceOrientation.landscapeLeft,
        DeviceOrientation.landscapeRight,
      ]);
    }

    super.initState();
  }

  @override
  void dispose() {
    SystemChrome.setPreferredOrientations([
      DeviceOrientation.portraitDown,
      DeviceOrientation.portraitUp,
      DeviceOrientation.landscapeLeft,
      DeviceOrientation.landscapeRight,
    ]);
    super.dispose();
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(
        title: Row(
          children: [
            Expanded(child: Container()),
            Text(title),
            Expanded(child: Container()),
            IconButton(
              onPressed: () => setState(() {
                currentCard = 0;
              }),
              icon: const Icon(Icons.repeat),
            ),
            ToggleButtons(
                children: const [
                  Icon(Icons.shuffle),
                  Icon(Icons.translate),
                ],
                isSelected: _isSelected,
                onPressed: (int index) {
                  setState(() {
                    _isSelected[index] = !_isSelected[index];
                  });
                })
          ],
        ),
        centerTitle: true,
      ),
      body: _FlashcardPage(
        card: widget.cards[currentCard],
        index: currentCard,
        languageFlipped: isLanguageSwitchedMode,
        onNextCard: () {
          setState(() {
            currentCard = isShuffleMode ? randomCard : currentCard + 1;
            if (currentCard == widget.cards.length) currentCard = 0;
            title = encouragingWords[Random().nextInt(encouragingWords.length)];
          });
        },
      ),
    );
  }
}

class _FlashcardPage extends StatefulWidget {
  final YokutangoEntry card;
  final Function() onNextCard;
  final bool languageFlipped;
  final int? index;

  const _FlashcardPage({
    required this.card,
    required this.onNextCard,
    this.languageFlipped = false,
    this.index,
    Key? key,
  }) : super(key: key);

  @override
  _FlashcardPageState createState() => _FlashcardPageState();
}

class _FlashcardPageState extends State<_FlashcardPage> {
  bool isPressed = false;

  @override
  Widget build(BuildContext context) {
    return GestureDetector(
      onTap: () {
        if (isPressed) {
          widget.onNextCard();
        }

        setState(() {
          isPressed = !isPressed;
        });
      },
      child: Center(
        child: Row(
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            Flashcard(
              card: widget.card,
              cardIndex: widget.index,
              isLeftSide: true,
              languageFlipped: widget.languageFlipped,
            ),
            const SizedBox(width: 40),
            Flashcard(
              card: isPressed ? widget.card : null,
              cardIndex: widget.index,
              languageFlipped: widget.languageFlipped,
            ),
          ],
        ),
      ),
    );
  }
}