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Flutter Fancy Button
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| import 'package:flutter/material.dart'; | |
| class FancyButton extends StatefulWidget { | |
| const FancyButton({ | |
| Key? key, | |
| required this.child, | |
| required this.size, | |
| required this.color, | |
| this.duration = const Duration(milliseconds: 160), | |
| this.onPressed, | |
| }) : super(key: key); | |
| final Widget child; | |
| final Color color; | |
| final Duration duration; | |
| final VoidCallback? onPressed; | |
| final double size; | |
| @override | |
| _FancyButtonState createState() => _FancyButtonState(); | |
| } | |
| class _FancyButtonState extends State<FancyButton> with TickerProviderStateMixin { | |
| AnimationController? _animationController; | |
| Animation<double>? _pressedAnimation; | |
| TickerFuture? _downTicker; | |
| double get buttonDepth => widget.size * 0.2; | |
| @override | |
| void initState() { | |
| super.initState(); | |
| _setupAnimation(); | |
| } | |
| void _setupAnimation() { | |
| _animationController?.stop(); | |
| final oldControllerValue = _animationController?.value ?? 0; | |
| _animationController?.dispose(); | |
| _animationController = AnimationController( | |
| duration: Duration(microseconds: widget.duration.inMicroseconds ~/ 2), | |
| vsync: this, | |
| value: oldControllerValue, | |
| ); | |
| _pressedAnimation = Tween<double>(begin: -buttonDepth, end: 0.0).animate( | |
| CurvedAnimation(parent: _animationController!, curve: Curves.easeInOut), | |
| ); | |
| } | |
| @override | |
| void didUpdateWidget(FancyButton oldWidget) { | |
| super.didUpdateWidget(oldWidget); | |
| if (oldWidget.duration != widget.duration) { | |
| _setupAnimation(); | |
| } | |
| } | |
| @override | |
| void dispose() { | |
| _animationController?.dispose(); | |
| super.dispose(); | |
| } | |
| void _onTapDown(TapDownDetails _) { | |
| if (widget.onPressed != null) { | |
| _downTicker = _animationController?.animateTo(1.0); | |
| } | |
| } | |
| void _onTapUp(TapUpDetails _) { | |
| if (widget.onPressed != null) { | |
| _downTicker?.whenComplete(() { | |
| _animationController?.animateTo(0.0); | |
| widget.onPressed?.call(); | |
| }); | |
| } | |
| } | |
| void _onTapCancel() { | |
| if (widget.onPressed != null) { | |
| _animationController?.reset(); | |
| } | |
| } | |
| @override | |
| Widget build(BuildContext context) { | |
| final vertPadding = widget.size * 0.25; | |
| final horzPadding = widget.size * 0.50; | |
| final radius = BorderRadius.circular(horzPadding * 0.5); | |
| return Container( | |
| padding: widget.onPressed != null ? EdgeInsets.only(bottom: 2, left: 0.5, right: 0.5) : null, | |
| decoration: BoxDecoration( | |
| color: Colors.black87, | |
| borderRadius: radius, | |
| ), | |
| width: double.infinity, | |
| child: GestureDetector( | |
| onTapDown: _onTapDown, | |
| onTapUp: _onTapUp, | |
| onTapCancel: _onTapCancel, | |
| child: IntrinsicWidth( | |
| child: IntrinsicHeight( | |
| child: Stack( | |
| children: <Widget>[ | |
| Container( | |
| decoration: BoxDecoration( | |
| color: _hslRelativeColor(s: -0.20, l: -0.20), | |
| borderRadius: radius, | |
| ), | |
| ), | |
| _pressedAnimation != null ? AnimatedBuilder( | |
| animation: _pressedAnimation!, | |
| builder: (BuildContext context, Widget? child) { | |
| return Transform.translate( | |
| offset: Offset(0.0, _pressedAnimation!.value), | |
| child: child, | |
| ); | |
| }, | |
| child: Stack( | |
| clipBehavior: Clip.none, // Updated from Overflow.visible | |
| children: <Widget>[ | |
| ClipRRect( | |
| borderRadius: radius, | |
| child: Stack( | |
| children: <Widget>[ | |
| DecoratedBox( | |
| decoration: BoxDecoration( | |
| color: _hslRelativeColor(l: 0.06), | |
| borderRadius: radius, | |
| ), | |
| child: SizedBox.expand(), | |
| ), | |
| Transform.translate( | |
| offset: Offset(0.0, vertPadding * 2), | |
| child: DecoratedBox( | |
| decoration: BoxDecoration( | |
| color: _hslRelativeColor(), | |
| borderRadius: radius, | |
| ), | |
| child: SizedBox.expand(), | |
| ), | |
| ), | |
| ], | |
| ), | |
| ), | |
| Padding( | |
| padding: EdgeInsets.symmetric( | |
| vertical: vertPadding, | |
| horizontal: horzPadding, | |
| ), | |
| child: Center( | |
| child: widget.child, | |
| ), | |
| ) | |
| ], | |
| ), | |
| ) : SizedBox(), | |
| ], | |
| ), | |
| ), | |
| ), | |
| ), | |
| ); | |
| } | |
| Color _hslRelativeColor({double h = 0.0, double s = 0.0, double l = 0.0}) { | |
| final hslColor = HSLColor.fromColor(widget.color); | |
| h = (hslColor.hue + h).clamp(0.0, 360.0); | |
| s = (hslColor.saturation + s).clamp(0.0, 1.0); | |
| l = (hslColor.lightness + l).clamp(0.0, 1.0); | |
| return HSLColor.fromAHSL(hslColor.alpha, h, s, l).toColor(); | |
| } | |
| } |
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