Rastreador de hábitos: Modo claro y oscuro

Parte de la sección Proyectos del Journey de Flutter de Coddy. Lección 36 de 36.

La gente revisa sus hábitos tarde por la noche, así que la última función es el modo oscuro, con un botón en la barra superior: una luna para activarlo y un sol para volver a desactivarlo.

El tema está en MaterialApp, así que el interruptor también: MyApp se convierte en un StatefulWidget con un bool _dark. MaterialApp recibe ambos temas y elige uno con themeMode:

darkTheme: ThemeData(
  colorScheme: ColorScheme.fromSeed(
    seedColor: Colors.green,
    brightness: Brightness.dark,
  ),
),
themeMode: _dark ? ThemeMode.dark : ThemeMode.light,

El botón está en la pantalla de hábitos, muy por debajo de MyApp. Sube el estado una vez más: HabitScreen recibe dark para elegir su icono y una devolución de llamada onToggleTheme que debe invocar. La pantalla los lee de su widget como widget.dark y widget.onToggleTheme.

Todos los colores de la aplicación procedían del tema, así que las tarjetas, los círculos y el anillo cambian con él. Tus hábitos siguen marcados, ya que están en el estado de la pantalla, no en el tema.

Esta es la última lección de los proyectos del curso. Las comprobaciones usan el rastreador completo: añadir, marcar, racha, eliminar, el anillo y el modo oscuro.

Desafío

Difícil

Añade el modo oscuro:

convierte MyApp en un StatefulWidget con bool _dark = false, proporciona a MaterialApp un darkTheme con la misma semilla verde y Brightness.dark, y establece themeMode a partir de _dark
proporciona a HabitScreen un required bool dark y un VoidCallback onToggleTheme; MyApp pasa _dark y una función que lo invierte dentro de setState
en las actions de la barra superior, un IconButton muestra Icons.dark_mode en el modo claro y Icons.light_mode en el modo oscuro, y llama a widget.onToggleTheme

Pruébalo tú mismo

import 'package:flutter/material.dart';

void main() {
  runApp(const MyApp());
}

class MyApp extends StatelessWidget {
  const MyApp({super.key});

  @override
  Widget build(BuildContext context) {
    return MaterialApp(
      debugShowCheckedModeBanner: false,
      theme: ThemeData(
        colorScheme: ColorScheme.fromSeed(seedColor: Colors.green),
      ),
      home: const HabitScreen(),
    );
  }
}

const List<String> dayNames = ['Mon', 'Tue', 'Wed', 'Thu', 'Fri', 'Sat', 'Sun'];

class Habit {
  Habit(this.name, this.days);

  final String name;
  final List<bool> days;

  int get done => days.where((day) => day).length;

  int get streak {
    int best = 0;
    int run = 0;
    for (bool day in days) {
      if (day) {
        run++;
        if (run > best) best = run;
      } else {
        run = 0;
      }
    }
    return best;
  }
}

class HabitScreen extends StatefulWidget {
  const HabitScreen({super.key});

  @override
  State<HabitScreen> createState() => _HabitScreenState();
}

class _HabitScreenState extends State<HabitScreen> {
  final List<Habit> _habits = [
    Habit('Drink water', [true, true, true, false, true, false, false]),
    Habit('Read 10 pages', [true, false, true, true, false, false, false]),
    Habit('Stretch', List.filled(7, false)),
  ];

  int get _ticks => _habits.fold(0, (sum, habit) => sum + habit.done);
  int get _possible => _habits.length * 7;

  void _toggle(Habit habit, int day) {
    setState(() {
      habit.days[day] = !habit.days[day];
    });
  }

  Future<void> _addHabit() async {
    String name = '';
    final added = await showDialog<bool>(
      context: context,
      builder: (context) => AlertDialog(
        title: const Text('New habit'),
        content: TextField(
          autofocus: true,
          decoration: const InputDecoration(labelText: 'Habit name'),
          onChanged: (value) => name = value,
        ),
        actions: [
          TextButton(
            onPressed: () => Navigator.pop(context, false),
            child: const Text('Cancel'),
          ),
          FilledButton(
            onPressed: () => Navigator.pop(context, true),
            child: const Text('Add'),
          ),
        ],
      ),
    );
    if (added != true || name.trim().isEmpty) return;
    setState(() {
      _habits.add(Habit(name.trim(), List.filled(7, false)));
    });
  }

  Future<void> _deleteHabit(Habit habit) async {
    final delete = await showDialog<bool>(
      context: context,
      builder: (context) => AlertDialog(
        title: Text('Delete ${habit.name}?'),
        content: const Text('Its ticks for this week go with it.'),
        actions: [
          TextButton(
            onPressed: () => Navigator.pop(context, false),
            child: const Text('Cancel'),
          ),
          FilledButton(
            onPressed: () => Navigator.pop(context, true),
            child: const Text('Delete'),
          ),
        ],
      ),
    );
    if (delete != true) return;
    setState(() {
      _habits.remove(habit);
    });
  }

  @override
  Widget build(BuildContext context) {
    return Scaffold(
      appBar: AppBar(title: const Text('Habits')),
      floatingActionButton: FloatingActionButton(
        onPressed: _addHabit,
        child: const Icon(Icons.add),
      ),
      body: ListView(
        padding: const EdgeInsets.fromLTRB(16, 8, 16, 88),
        children: [
          ProgressCard(ticks: _ticks, possible: _possible),
          for (Habit habit in _habits)
            HabitCard(
              habit: habit,
              onToggle: (day) => _toggle(habit, day),
              onLongPress: () => _deleteHabit(habit),
            ),
        ],
      ),
    );
  }
}

class ProgressCard extends StatelessWidget {
  const ProgressCard({super.key, required this.ticks, required this.possible});

  final int ticks;
  final int possible;

  @override
  Widget build(BuildContext context) {
    final colors = Theme.of(context).colorScheme;
    final textTheme = Theme.of(context).textTheme;
    final progress = possible == 0 ? 0.0 : ticks / possible;
    return Card(
      margin: EdgeInsets.zero,
      color: colors.primaryContainer,
      child: Padding(
        padding: const EdgeInsets.all(20),
        child: Row(
          children: [
            SizedBox(
              width: 72,
              height: 72,
              child: Stack(
                fit: StackFit.expand,
                children: [
                  CircularProgressIndicator(
                    value: progress,
                    strokeWidth: 8,
                    strokeCap: StrokeCap.round,
                    backgroundColor: colors.surface,
                  ),
                  Center(
                    child: Text(
                      '${(progress * 100).round()}%',
                      style: textTheme.titleMedium?.copyWith(fontWeight: FontWeight.bold),
                    ),
                  ),
                ],
              ),
            ),
            const SizedBox(width: 20),
            Expanded(
              child: Column(
                crossAxisAlignment: CrossAxisAlignment.start,
                children: [
                  Text('This week', style: textTheme.titleLarge),
                  const SizedBox(height: 4),
                  Text('$ticks of $possible ticks'),
                ],
              ),
            ),
          ],
        ),
      ),
    );
  }
}

class HabitCard extends StatelessWidget {
  const HabitCard({
    super.key,
    required this.habit,
    required this.onToggle,
    required this.onLongPress,
  });

  final Habit habit;
  final void Function(int day) onToggle;
  final VoidCallback onLongPress;

  @override
  Widget build(BuildContext context) {
    final textTheme = Theme.of(context).textTheme;
    return Card(
      margin: const EdgeInsets.only(top: 12),
      clipBehavior: Clip.antiAlias,
      child: InkWell(
        onLongPress: onLongPress,
        child: Padding(
          padding: const EdgeInsets.all(16),
          child: Column(
            crossAxisAlignment: CrossAxisAlignment.start,
            children: [
              Row(
                children: [
                  Expanded(child: Text(habit.name, style: textTheme.titleMedium)),
                  Text('${habit.done} of 7 days', style: textTheme.bodySmall),
                ],
              ),
              const SizedBox(height: 12),
              Row(
                mainAxisAlignment: MainAxisAlignment.spaceBetween,
                children: [
                  for (int i = 0; i < 7; i++)
                    DayCircle(
                      label: dayNames[i],
                      done: habit.days[i],
                      onTap: () => onToggle(i),
                    ),
                ],
              ),
              const SizedBox(height: 12),
              Row(
                children: [
                  Icon(
                    Icons.local_fire_department,
                    size: 20,
                    color: habit.streak > 0 ? Colors.orange : Theme.of(context).colorScheme.outline,
                  ),
                  const SizedBox(width: 4),
                  Text(habit.streak == 0 ? 'No streak yet' : '${habit.streak} day streak'),
                ],
              ),
            ],
          ),
        ),
      ),
    );
  }
}

class DayCircle extends StatelessWidget {
  const DayCircle({super.key, required this.label, required this.done, required this.onTap});

  final String label;
  final bool done;
  final VoidCallback onTap;

  @override
  Widget build(BuildContext context) {
    final colors = Theme.of(context).colorScheme;
    return GestureDetector(
      onTap: onTap,
      child: Container(
        width: 40,
        height: 40,
        alignment: Alignment.center,
        decoration: BoxDecoration(
          shape: BoxShape.circle,
          color: done ? colors.primary : colors.surfaceContainerHighest,
        ),
        child: Text(
          label,
          style: TextStyle(
            fontSize: 11,
            fontWeight: FontWeight.bold,
            color: done ? colors.onPrimary : colors.onSurfaceVariant,
          ),
        ),
      ),
    );
  }
}