selfprivacy.org.app/lib/ui/components/pre_styled_buttons/flash_fab.dart

import 'package:easy_localization/easy_localization.dart';
import 'package:flutter/material.dart';
import 'package:flutter_bloc/flutter_bloc.dart';
import 'package:ionicons/ionicons.dart';
import 'package:selfprivacy/logic/cubit/client_jobs/client_jobs_cubit.dart';
import 'package:selfprivacy/ui/components/jobs_content/jobs_content.dart';

class BrandFab extends StatefulWidget {
  const BrandFab({
    this.extended = false,
    super.key,
  });

  final bool extended;

  @override
  State<BrandFab> createState() => _BrandFabState();
}

class _BrandFabState extends State<BrandFab>
    with SingleTickerProviderStateMixin {
  late AnimationController _animationController;
  late Animation _colorTween;

  @override
  void initState() {
    _animationController = AnimationController(
      vsync: this,
      duration: const Duration(milliseconds: 800),
    );
    super.initState();
  }

  @override
  void dispose() {
    _animationController.dispose();
    super.dispose();
  }

  bool wasPrevStateIsEmpty = true;

  @override
  Widget build(final BuildContext context) {
    _colorTween = ColorTween(
      begin: Theme.of(context).colorScheme.onPrimaryContainer,
      end: Theme.of(context).colorScheme.primary,
    ).animate(_animationController);

    return BlocListener<JobsCubit, JobsState>(
      listener: (final BuildContext context, final JobsState state) {
        if (wasPrevStateIsEmpty && state is! JobsStateEmpty) {
          wasPrevStateIsEmpty = false;
          _animationController.forward();
        } else if (!wasPrevStateIsEmpty && state is JobsStateEmpty) {
          wasPrevStateIsEmpty = true;

          _animationController.reverse();
        }
      },
      child: FloatingActionButton(
        onPressed: () {
          // TODO: Make a hero animation to the screen
          showModalBottomSheet(
            context: context,
            useRootNavigator: true,
            isScrollControlled: true,
            builder: (final BuildContext context) => DraggableScrollableSheet(
              expand: false,
              maxChildSize: 0.9,
              minChildSize: 0.4,
              initialChildSize: 0.6,
              builder: (final context, final scrollController) =>
                  JobsContent(controller: scrollController),
            ),
          );
        },
        isExtended: widget.extended,
        child: Row(
          crossAxisAlignment: CrossAxisAlignment.center,
          mainAxisAlignment: MainAxisAlignment.center,
          children: [
            AnimatedBuilder(
              animation: _colorTween,
              builder: (final BuildContext context, final Widget? child) {
                final double v = _animationController.value;
                final IconData icon =
                    v > 0.5 ? Ionicons.flash : Ionicons.flash_outline;
                return Transform.scale(
                  scale: 1 + (v < 0.5 ? v : 1 - v) * 2,
                  child: Icon(
                    icon,
                    color: _colorTween.value,
                  ),
                );
              },
            ),
            if (widget.extended)
              const SizedBox(
                width: 8,
              ),
            if (widget.extended)
              Text(
                'jobs.title'.tr(),
              ),
          ],
        ),
      ),
    );
  }
}