Flutterをやってみる

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part of 'playback_bloc.dart';

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part of 'playback_bloc.dart';
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@Freezed()
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class PlaybackEvent with _$PlaybackEvent {}

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extension DurationString on String {
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  /// Assumes a string (roughly) of the format '\d{1,2}:\d{2}'
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  Duration toDuration() => switch (split(':')) {
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        [var minutes, var seconds] => Duration(
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            minutes: int.parse(minutes.trim()),
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            seconds: int.parse(seconds.trim()),
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          ),
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        [var hours, var minutes, var seconds] => Duration(
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            hours: int.parse(hours.trim()),
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            minutes: int.parse(minutes.trim()),
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            seconds: int.parse(seconds.trim()),
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          ),
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        _ => throw Exception('Invalid duration string: $this'),
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      };
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}

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final _songs = <RankedSong>[
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  RankedSong(
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    1,
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    'Before You',
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    ArtistsProvider.shared.getArtist('jmo')!,
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    '2:45'.toDuration(),
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    const MyArtistImage(
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      image: 'assets/images/albums/artist6-album1.jpg',
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      sourceLink: 'https://unsplash.com/photos/cTKGZJTMJQU',
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      sourceName: 'Drew Dizzy Graham',
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    ),
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  ),
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]

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<!-- 文字列クラスに新しいメソッドを追加する例 -->
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<!-- Palindrome means 回文 -->
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extension StringExtension on String {
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  bool get isPalindrome {
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    String normalized = this.toLowerCase().replaceAll(RegExp(r'[\W_]+'), '');
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    return normalized == normalized.split('').reversed.join('');
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  }
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}
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void main() {
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  String text = 'A man a plan a canal Panama';
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  print(text.isPalindrome); // true
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}

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import 'package:flutter/material.dart';
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class ThemeProvider extends InheritedWidget {
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  <!-- ... -->
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  final pageTransitionsTheme = const PageTransitionsTheme(
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    builders: <TargetPlatform, PageTransitionsBuilder>{
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      TargetPlatform.android: FadeUpwardsPageTransitionsBuilder(),
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      TargetPlatform.iOS: CupertinoPageTransitionsBuilder(),
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      TargetPlatform.linux: NoAnimationPageTransitionsBuilder(),
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      TargetPlatform.macOS: NoAnimationPageTransitionsBuilder(),
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      TargetPlatform.windows: NoAnimationPageTransitionsBuilder(),
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    },
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  );
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  <!-- ... -->
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}

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val batteryStatus: Intent? = IntentFilter(Intent.ACTION_BATTERY_CHANGED).let { ifilter ->
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    context.registerReceiver(null, ifilter)
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}

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val status: Int = batteryStatus?.getIntExtra(BatteryManager.EXTRA_STATUS, -1) ?: -1
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val isCharging: Boolean = status == BatteryManager.BATTERY_STATUS_CHARGING
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        || status == BatteryManager.BATTERY_STATUS_FULL
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// How are we charging?
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val chargePlug: Int = batteryStatus?.getIntExtra(BatteryManager.EXTRA_PLUGGED, -1) ?: -1
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val usbCharge: Boolean = chargePlug == BatteryManager.BATTERY_PLUGGED_USB
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val acCharge: Boolean = chargePlug == BatteryManager.BATTERY_PLUGGED_AC

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private fun getBatteryLevel(): Int {
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    val batteryLevel: Int
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    if (VERSION.SDK_INT >= VERSION_CODES.LOLLIPOP) {
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      val batteryManager = getSystemService(Context.BATTERY_SERVICE) as BatteryManager
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      batteryLevel = batteryManager.getIntProperty(BatteryManager.BATTERY_PROPERTY_CAPACITY)
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    } else {
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      // val intent = ContextWrapper(applicationContext).registerReceiver(null, IntentFilter(Intent.ACTION_BATTERY_CHANGED))
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      // val level: Int = intent!!.getIntExtra(BatteryManager.EXTRA_LEVEL, -1)
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      // val scale: Int = intent.getIntExtra(BatteryManager.EXTRA_SCALE, -1)
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      // batteryLevel = level * 100 / scale
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      // https://developer.android.com/training/monitoring-device-state/battery-monitoring?hl=ja#kotlin
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      val batteryStatus: Intent? = IntentFilter(Intent.ACTION_BATTERY_CHANGED).let { ifilter ->
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        context.registerReceiver(null, ifilter)
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      }
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      val batteryPct: Float? = batteryStatus?.let { intent ->
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        val level: Int = intent.getIntExtra(BatteryManager.EXTRA_LEVEL, -1)
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        val scale: Int = intent.getIntExtra(BatteryManager.EXTRA_SCALE, -1)
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        level * 100 / scale.toFloat()
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      }
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      batteryLevel = batteryPct as Int
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    }
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    return batteryLevel
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  }