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Create A Simple Animated FloatingActionButton in Flutter
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import 'package:flutter/material.dart'; | |
class FancyFab extends StatefulWidget { | |
@override | |
_FancyFabState createState() => _FancyFabState(); | |
} | |
class _FancyFabState extends State<FancyFab> | |
with SingleTickerProviderStateMixin { | |
bool isOpened = false; | |
AnimationController _animationController; | |
Animation<Color> _animateColor; | |
Animation<double> _animateIcon; | |
Curve _curve = Curves.easeOut; | |
@override | |
initState() { | |
_animationController = | |
AnimationController(vsync: this, duration: Duration(milliseconds: 500)) | |
..addListener(() { | |
setState(() {}); | |
}); | |
_animateIcon = | |
Tween<double>(begin: 0.0, end: 1.0).animate(_animationController); | |
_animateColor = ColorTween( | |
begin: Colors.blue, | |
end: Colors.red, | |
).animate(CurvedAnimation( | |
parent: _animationController, | |
curve: Interval( | |
0.00, | |
1.00, | |
curve: _curve, | |
), | |
)); | |
super.initState(); | |
} | |
@override | |
dispose() { | |
_animationController.dispose(); | |
super.dispose(); | |
} | |
animate() { | |
if (!isOpened) { | |
_animationController.forward(); | |
} else { | |
_animationController.reverse(); | |
} | |
isOpened = !isOpened; | |
} | |
Widget toggle() { | |
return FloatingActionButton( | |
backgroundColor: _animateColor.value, | |
onPressed: animate, | |
tooltip: 'Toggle', | |
child: AnimatedIcon( | |
icon: AnimatedIcons.menu_close, | |
progress: _animateIcon, | |
), | |
); | |
} | |
@override | |
Widget build(BuildContext context) { | |
return toggle(); | |
} | |
} |
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