JorgeCastilloPrz

import androidx.compose.Composable
import androidx.ui.core.Modifier
import androidx.ui.core.tag
import androidx.ui.foundation.Text
import androidx.ui.foundation.drawBackground
import androidx.ui.graphics.Color
import androidx.ui.layout.ConstraintLayout
import androidx.ui.layout.ConstraintSet
import androidx.ui.layout.fillMaxWidth
import androidx.ui.layout.padding

JorgeCastilloPrz

// Persistence.kt will end up looking like this after exercises 1 and 2.

fun stubPersistence(defaultAccounts: List<User>? = null, pool: CoroutineContext = IOPool) =
  object : AccountPersistence {
    private var accounts = defaultAccounts ?: emptyList()

    private lateinit var updateTrigger: () -> Unit

    override fun loadAccountsFromDatabase(): Stream<List<User>> = Stream(
      Stream.async {

JorgeCastilloPrz

class MyApp extends StatelessWidget {
  @override
  Widget build(BuildContext context) {
    return MaterialApp(
        title: 'FabLoader Demo',
        theme: ThemeData(
          primarySwatch: Colors.blue,
        ),
        home: Scaffold(
          appBar: AppBar(

JorgeCastilloPrz

class _FabLoadingWidget extends State<FabLoader>
    with SingleTickerProviderStateMixin {
  final Widget child;
  final double strokeWidth;

  AnimationController _controller;

  _FabLoadingWidget({@required this.strokeWidth, @required this.child});

  @override

JorgeCastilloPrz

final Animatable<double> _kRotationTween = CurveTween(curve: const SawTooth(5));

JorgeCastilloPrz

final Animatable<int> _kStepTween = StepTween(begin: 0, end: 5);

JorgeCastilloPrz

final Animatable<double> _kStrokeTailTween = CurveTween(
  curve: const Interval(0.5, 1.0, curve: Curves.fastOutSlowIn),
).chain(CurveTween(
  curve: const SawTooth(5),
));

JorgeCastilloPrz

final Animatable<double> _kStrokeHeadTween = CurveTween(
  curve: const Interval(0.0, 0.5, curve: Curves.fastOutSlowIn),
).chain(CurveTween(
  curve: const SawTooth(5),
));

JorgeCastilloPrz

class ArcPainter extends CustomPainter {
  // ...
  
  @override
  void paint(Canvas canvas, Size size) {
    if (backgroundColor != null) {
      final Paint backgroundPaint = Paint()
        ..color = backgroundColor
        ..strokeWidth = strokeWidth
        ..style = PaintingStyle.stroke;

JorgeCastilloPrz

class ArcPainter extends CustomPainter {
  // ...
  
  @override
  void paint(Canvas canvas, Size size) {
    if (backgroundColor != null) {
      final Paint backgroundPaint = Paint()
        ..color = backgroundColor
        ..strokeWidth = strokeWidth
        ..style = PaintingStyle.stroke;