437 lines
13 KiB
Dart
437 lines
13 KiB
Dart
import 'dart:math';
|
|
|
|
import 'package:flutter/material.dart';
|
|
|
|
class CardSwiper extends StatefulWidget {
|
|
/// list of widgets for the swiper
|
|
final List<Widget?>? cards;
|
|
|
|
/// controller to trigger actions
|
|
final CardSwiperController? controller;
|
|
|
|
/// duration of every animation
|
|
final Duration duration;
|
|
|
|
/// padding of the swiper
|
|
final EdgeInsetsGeometry padding;
|
|
|
|
/// maximum angle the card reaches while swiping
|
|
final double maxAngle;
|
|
|
|
/// threshold from which the card is swiped away
|
|
final int threshold;
|
|
|
|
/// set to true if swiping should be disabled, exception: triggered from the outside
|
|
final bool isDisabled;
|
|
|
|
/// function that gets called with the new index and detected swipe direction when the user swiped or swipe is triggered by controller
|
|
final Function onSwipe;
|
|
|
|
/// function that gets called when there is no widget left to be swiped away
|
|
final Function onEnd;
|
|
|
|
/// function that gets triggered when the swiper is disabled
|
|
final Function onTapDisabled;
|
|
|
|
/// direction in which the card gets swiped when triggered by controller, default set to right
|
|
final CardSwiperDirection direction;
|
|
|
|
const CardSwiper({
|
|
Key? key,
|
|
required this.cards,
|
|
this.controller,
|
|
this.padding = const EdgeInsets.symmetric(horizontal: 20, vertical: 25),
|
|
this.duration = const Duration(milliseconds: 200),
|
|
this.maxAngle = 30,
|
|
this.threshold = 50,
|
|
this.isDisabled = false,
|
|
this.onTapDisabled = emptyFunction,
|
|
this.onSwipe = emptyFunctionIndex,
|
|
this.onEnd = emptyFunction,
|
|
this.direction = CardSwiperDirection.right,
|
|
}) : assert(maxAngle >= 0 && maxAngle <= 360),
|
|
assert(threshold >= 1 && threshold <= 100),
|
|
assert(direction != CardSwiperDirection.none),
|
|
super(key: key);
|
|
|
|
@override
|
|
State createState() => _CardSwiperState();
|
|
}
|
|
|
|
class _CardSwiperState extends State<CardSwiper>
|
|
with SingleTickerProviderStateMixin {
|
|
double _left = 0;
|
|
double _top = 0;
|
|
double _total = 0;
|
|
double _angle = 0;
|
|
double _maxAngle = 0;
|
|
double _scale = 0.9;
|
|
double _difference = 40;
|
|
|
|
int _currentIndex = 0;
|
|
|
|
SwipeType _swipeTyp = SwipeType.none;
|
|
bool _tapOnTop = false; //position of starting drag point on card
|
|
|
|
late AnimationController _animationController;
|
|
late Animation<double> _leftAnimation;
|
|
late Animation<double> _topAnimation;
|
|
late Animation<double> _scaleAnimation;
|
|
late Animation<double> _differenceAnimation;
|
|
|
|
CardSwiperDirection detectedDirection = CardSwiperDirection.none;
|
|
|
|
bool get _isLastCard => _currentIndex == widget.cards!.length - 1;
|
|
int get _nextCardIndex => _isLastCard ? 0 : _currentIndex + 1;
|
|
|
|
@override
|
|
void initState() {
|
|
super.initState();
|
|
|
|
if (widget.controller != null) {
|
|
widget.controller!
|
|
//swipe widget from the outside
|
|
..addListener(() {
|
|
if (widget.controller!.state == CardSwiperState.swipe) {
|
|
if (widget.cards!.isNotEmpty) {
|
|
switch (widget.direction) {
|
|
case CardSwiperDirection.right:
|
|
_swipeHorizontal(context);
|
|
break;
|
|
case CardSwiperDirection.left:
|
|
_swipeHorizontal(context);
|
|
break;
|
|
case CardSwiperDirection.top:
|
|
_swipeVertical(context);
|
|
break;
|
|
case CardSwiperDirection.bottom:
|
|
_swipeVertical(context);
|
|
break;
|
|
case CardSwiperDirection.none:
|
|
break;
|
|
}
|
|
_animationController.forward();
|
|
}
|
|
}
|
|
})
|
|
//swipe widget left from the outside
|
|
..addListener(() {
|
|
if (widget.controller!.state == CardSwiperState.swipeLeft) {
|
|
if (widget.cards!.isNotEmpty) {
|
|
_left = -1;
|
|
_swipeHorizontal(context);
|
|
_animationController.forward();
|
|
}
|
|
}
|
|
})
|
|
//swipe widget right from the outside
|
|
..addListener(() {
|
|
if (widget.controller!.state == CardSwiperState.swipeRight) {
|
|
if (widget.cards!.isNotEmpty) {
|
|
_left = widget.threshold + 1;
|
|
_swipeHorizontal(context);
|
|
_animationController.forward();
|
|
}
|
|
}
|
|
});
|
|
}
|
|
|
|
if (widget.maxAngle > 0) {
|
|
_maxAngle = widget.maxAngle * (pi / 180);
|
|
}
|
|
|
|
_animationController =
|
|
AnimationController(duration: widget.duration, vsync: this);
|
|
_animationController.addListener(() {
|
|
//when value of controller changes
|
|
if (_animationController.status == AnimationStatus.forward) {
|
|
setState(() {
|
|
_left = _leftAnimation.value;
|
|
_top = _topAnimation.value;
|
|
_scale = _scaleAnimation.value;
|
|
_difference = _differenceAnimation.value;
|
|
});
|
|
}
|
|
});
|
|
|
|
_animationController.addStatusListener((status) {
|
|
//when status of controller changes
|
|
if (status == AnimationStatus.completed) {
|
|
setState(() {
|
|
if (_swipeTyp == SwipeType.swipe) {
|
|
widget.onSwipe(_currentIndex, detectedDirection);
|
|
|
|
if (_isLastCard) {
|
|
widget.onEnd();
|
|
_currentIndex = 0;
|
|
} else {
|
|
_currentIndex++;
|
|
}
|
|
}
|
|
_animationController.reset();
|
|
_left = 0;
|
|
_top = 0;
|
|
_total = 0;
|
|
_angle = 0;
|
|
_scale = 0.9;
|
|
_difference = 40;
|
|
_swipeTyp = SwipeType.none;
|
|
});
|
|
}
|
|
});
|
|
}
|
|
|
|
@override
|
|
void dispose() {
|
|
super.dispose();
|
|
_animationController.dispose();
|
|
}
|
|
|
|
@override
|
|
Widget build(BuildContext context) {
|
|
return LayoutBuilder(
|
|
builder: (BuildContext context, BoxConstraints constraints) {
|
|
return Container(
|
|
padding: widget.padding,
|
|
child: LayoutBuilder(
|
|
builder: (BuildContext context, BoxConstraints constraints) {
|
|
return Stack(
|
|
clipBehavior: Clip.none,
|
|
fit: StackFit.expand,
|
|
children: [
|
|
_backItem(constraints, _nextCardIndex),
|
|
_frontItem(constraints, _currentIndex)
|
|
]);
|
|
},
|
|
),
|
|
);
|
|
},
|
|
);
|
|
}
|
|
|
|
Widget _frontItem(BoxConstraints constraints, int index) {
|
|
return Positioned(
|
|
left: _left,
|
|
top: _top,
|
|
child: GestureDetector(
|
|
child: Transform.rotate(
|
|
angle: _angle,
|
|
child: Container(
|
|
constraints: constraints,
|
|
child: widget.cards![index],
|
|
),
|
|
),
|
|
onTap: () {
|
|
if (widget.isDisabled) {
|
|
widget.onTapDisabled();
|
|
}
|
|
},
|
|
onPanStart: (tapInfo) {
|
|
if (!widget.isDisabled) {
|
|
RenderBox renderBox = context.findRenderObject() as RenderBox;
|
|
Offset position = renderBox.globalToLocal(tapInfo.globalPosition);
|
|
|
|
if (position.dy < renderBox.size.height / 2) _tapOnTop = true;
|
|
}
|
|
},
|
|
onPanUpdate: (tapInfo) {
|
|
if (!widget.isDisabled) {
|
|
setState(() {
|
|
_left += tapInfo.delta.dx;
|
|
_top += tapInfo.delta.dy;
|
|
_total = _left + _top;
|
|
_calculateAngle();
|
|
_calculateScale();
|
|
_calculateDifference();
|
|
});
|
|
}
|
|
},
|
|
onPanEnd: (tapInfo) {
|
|
if (!widget.isDisabled) {
|
|
_tapOnTop = false;
|
|
_onEndAnimation();
|
|
_animationController.forward();
|
|
}
|
|
},
|
|
),
|
|
);
|
|
}
|
|
|
|
Widget _backItem(BoxConstraints constraints, int index) {
|
|
return Visibility(
|
|
visible: widget.cards!.length - index <= 2,
|
|
child: Positioned(
|
|
top: _difference,
|
|
left: 0,
|
|
child: Container(
|
|
color: Colors.transparent,
|
|
child: Transform.scale(
|
|
scale: _scale,
|
|
child: Container(
|
|
constraints: constraints,
|
|
child: widget.cards![index],
|
|
),
|
|
),
|
|
),
|
|
),
|
|
);
|
|
}
|
|
|
|
void _calculateAngle() {
|
|
if (_angle <= _maxAngle && _angle >= -_maxAngle) {
|
|
(_tapOnTop == true)
|
|
? _angle = (_maxAngle / 100) * (_left / 10)
|
|
: _angle = (_maxAngle / 100) * (_left / 10) * -1;
|
|
}
|
|
}
|
|
|
|
void _calculateScale() {
|
|
if (_scale <= 1.0 && _scale >= 0.9) {
|
|
_scale =
|
|
(_total > 0) ? 0.9 + (_total / 5000) : 0.9 + -1 * (_total / 5000);
|
|
}
|
|
}
|
|
|
|
void _calculateDifference() {
|
|
if (_difference >= 0 && _difference <= _difference) {
|
|
_difference = (_total > 0) ? 40 - (_total / 10) : 40 + (_total / 10);
|
|
}
|
|
}
|
|
|
|
void _onEndAnimation() {
|
|
if (_left < -widget.threshold || _left > widget.threshold) {
|
|
_swipeHorizontal(context);
|
|
} else if (_top < -widget.threshold || _top > widget.threshold) {
|
|
_swipeVertical(context);
|
|
} else {
|
|
_goBack(context);
|
|
}
|
|
}
|
|
|
|
//moves the card away to the left or right
|
|
void _swipeHorizontal(BuildContext context) {
|
|
setState(() {
|
|
_swipeTyp = SwipeType.swipe;
|
|
_leftAnimation = Tween<double>(
|
|
begin: _left,
|
|
end: (_left == 0)
|
|
? (widget.direction == CardSwiperDirection.right)
|
|
? MediaQuery.of(context).size.width
|
|
: -MediaQuery.of(context).size.width
|
|
: (_left > widget.threshold)
|
|
? MediaQuery.of(context).size.width
|
|
: -MediaQuery.of(context).size.width,
|
|
).animate(_animationController);
|
|
_topAnimation = Tween<double>(
|
|
begin: _top,
|
|
end: _top + _top,
|
|
).animate(_animationController);
|
|
_scaleAnimation = Tween<double>(
|
|
begin: _scale,
|
|
end: 1.0,
|
|
).animate(_animationController);
|
|
_differenceAnimation = Tween<double>(
|
|
begin: _difference,
|
|
end: 0,
|
|
).animate(_animationController);
|
|
});
|
|
if (_left > widget.threshold ||
|
|
_left == 0 && widget.direction == CardSwiperDirection.right) {
|
|
detectedDirection = CardSwiperDirection.right;
|
|
} else {
|
|
detectedDirection = CardSwiperDirection.left;
|
|
}
|
|
}
|
|
|
|
//moves the card away to the top or bottom
|
|
void _swipeVertical(BuildContext context) {
|
|
setState(() {
|
|
_swipeTyp = SwipeType.swipe;
|
|
_leftAnimation = Tween<double>(
|
|
begin: _left,
|
|
end: _left + _left,
|
|
).animate(_animationController);
|
|
_topAnimation = Tween<double>(
|
|
begin: _top,
|
|
end: (_top == 0)
|
|
? (widget.direction == CardSwiperDirection.bottom)
|
|
? MediaQuery.of(context).size.height
|
|
: -MediaQuery.of(context).size.height
|
|
: (_top > widget.threshold)
|
|
? MediaQuery.of(context).size.height
|
|
: -MediaQuery.of(context).size.height,
|
|
).animate(_animationController);
|
|
_scaleAnimation = Tween<double>(
|
|
begin: _scale,
|
|
end: 1.0,
|
|
).animate(_animationController);
|
|
_differenceAnimation = Tween<double>(
|
|
begin: _difference,
|
|
end: 0,
|
|
).animate(_animationController);
|
|
});
|
|
if (_top > widget.threshold ||
|
|
_top == 0 && widget.direction == CardSwiperDirection.bottom) {
|
|
detectedDirection = CardSwiperDirection.bottom;
|
|
} else {
|
|
detectedDirection = CardSwiperDirection.top;
|
|
}
|
|
}
|
|
|
|
//moves the card back to starting position
|
|
void _goBack(BuildContext context) {
|
|
setState(() {
|
|
_swipeTyp = SwipeType.back;
|
|
_leftAnimation = Tween<double>(
|
|
begin: _left,
|
|
end: 0,
|
|
).animate(_animationController);
|
|
_topAnimation = Tween<double>(
|
|
begin: _top,
|
|
end: 0,
|
|
).animate(_animationController);
|
|
_scaleAnimation = Tween<double>(
|
|
begin: _scale,
|
|
end: 0.9,
|
|
).animate(_animationController);
|
|
_differenceAnimation = Tween<double>(
|
|
begin: _difference,
|
|
end: 40,
|
|
).animate(_animationController);
|
|
});
|
|
}
|
|
}
|
|
|
|
//for null safety
|
|
void emptyFunction() {}
|
|
void emptyFunctionIndex(int index, CardSwiperDirection direction) {}
|
|
|
|
//to call the swipe function from outside of the appinio swiper
|
|
class CardSwiperController extends ChangeNotifier {
|
|
CardSwiperState? state;
|
|
|
|
//swipe the card by changing the status of the controller
|
|
void swipe() {
|
|
state = CardSwiperState.swipe;
|
|
notifyListeners();
|
|
}
|
|
|
|
//swipe the card to the left side by changing the status of the controller
|
|
void swipeLeft() {
|
|
state = CardSwiperState.swipeLeft;
|
|
notifyListeners();
|
|
}
|
|
|
|
//swipe the card to the right side by changing the status of the controller
|
|
void swipeRight() {
|
|
state = CardSwiperState.swipeRight;
|
|
notifyListeners();
|
|
}
|
|
}
|
|
|
|
enum CardSwiperState { swipe, swipeLeft, swipeRight }
|
|
|
|
enum CardSwiperDirection { none, left, right, top, bottom }
|
|
|
|
enum SwipeType { none, swipe, back }
|