part of 'pre_styled_buttons.dart'; class _BrandFlashButton extends StatefulWidget { _BrandFlashButton({Key? key}) : super(key: key); @override _BrandFlashButtonState createState() => _BrandFlashButtonState(); } class _BrandFlashButtonState extends State<_BrandFlashButton> with SingleTickerProviderStateMixin { late AnimationController _animationController; late Animation _colorTween; @override void initState() { _animationController = AnimationController(vsync: this, duration: Duration(milliseconds: 800)); _colorTween = ColorTween( begin: BrandColors.black, end: BrandColors.primary, ).animate(_animationController); super.initState(); WidgetsBinding.instance.addPostFrameCallback(_afterLayout); } void _afterLayout(_) { if (Theme.of(context).brightness == Brightness.dark) { setState(() { _colorTween = ColorTween( begin: BrandColors.white, end: BrandColors.primary, ).animate(_animationController); }); } } @override void dispose() { _animationController.dispose(); super.dispose(); } bool wasPrevStateIsEmpty = true; @override Widget build(BuildContext context) { return BlocListener( listener: (context, state) { if (wasPrevStateIsEmpty && state is! JobsStateEmpty) { wasPrevStateIsEmpty = false; _animationController.forward(); } else if (!wasPrevStateIsEmpty && state is JobsStateEmpty) { wasPrevStateIsEmpty = true; _animationController.reverse(); } }, child: IconButton( onPressed: () { showBrandBottomSheet( context: context, builder: (context) => BrandBottomSheet( isExpended: true, child: JobsContent(), ), ); }, icon: AnimatedBuilder( animation: _colorTween, builder: (context, child) { var v = _animationController.value; var 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, ), ); }), ), ); } }