368 lines
11 KiB
Dart
368 lines
11 KiB
Dart
library swipeable_cards_stack;
|
|
|
|
import 'dart:math';
|
|
|
|
import 'package:flutter/material.dart';
|
|
import 'package:swipeable_cards_stack/swipeable_cards_stack_controller.dart';
|
|
|
|
export 'swipeable_cards_stack_controller.dart';
|
|
|
|
const List<Alignment> cardsAlign = [
|
|
Alignment(0.0, 1.0),
|
|
Alignment(0.0, 0.8),
|
|
Alignment(0.0, 0.0)
|
|
];
|
|
final List<Size> cardsSize = List.filled(3, const Size(1, 1));
|
|
|
|
class SwipeableCardsStack extends StatefulWidget {
|
|
final SwipeableCardsStackController? cardController;
|
|
|
|
//First 3 widgets
|
|
final List<Widget> items;
|
|
final Function? onCardSwiped;
|
|
final double cardWidthTopMul;
|
|
final double cardWidthMiddleMul;
|
|
final double cardWidthBottomMul;
|
|
final double cardHeightTopMul;
|
|
final double cardHeightMiddleMul;
|
|
final double cardHeightBottomMul;
|
|
final Function? appendItemCallback;
|
|
final bool enableSwipeUp;
|
|
final bool enableSwipeDown;
|
|
|
|
SwipeableCardsStack({
|
|
Key? key,
|
|
this.cardController,
|
|
required BuildContext context,
|
|
required this.items,
|
|
this.onCardSwiped,
|
|
this.cardWidthTopMul = 0.9,
|
|
this.cardWidthMiddleMul = 0.85,
|
|
this.cardWidthBottomMul = 0.8,
|
|
this.cardHeightTopMul = 0.6,
|
|
this.cardHeightMiddleMul = 0.55,
|
|
this.cardHeightBottomMul = 0.5,
|
|
this.appendItemCallback,
|
|
this.enableSwipeUp = true,
|
|
this.enableSwipeDown = true,
|
|
}) : super(key: key) {
|
|
cardsSize[0] = Size(
|
|
MediaQuery.of(context).size.width * cardWidthTopMul,
|
|
MediaQuery.of(context).size.height * cardHeightTopMul,
|
|
);
|
|
cardsSize[1] = Size(
|
|
MediaQuery.of(context).size.width * cardWidthMiddleMul,
|
|
MediaQuery.of(context).size.height * cardHeightMiddleMul,
|
|
);
|
|
cardsSize[2] = Size(
|
|
MediaQuery.of(context).size.width * cardWidthBottomMul,
|
|
MediaQuery.of(context).size.height * cardHeightBottomMul,
|
|
);
|
|
}
|
|
|
|
@override
|
|
State<SwipeableCardsStack> createState() => _SwipeableCardsStackState();
|
|
}
|
|
|
|
class _SwipeableCardsStackState extends State<SwipeableCardsStack>
|
|
with SingleTickerProviderStateMixin {
|
|
int cardsCounter = 0;
|
|
int index = 0;
|
|
Widget? appendCard;
|
|
|
|
List<Widget?> cards = [];
|
|
late AnimationController _controller;
|
|
bool enableSwipe = true;
|
|
|
|
final Alignment defaultFrontCardAlign = const Alignment(0.0, 0.0);
|
|
Alignment frontCardAlign = cardsAlign[2];
|
|
double frontCardRot = 0.0;
|
|
|
|
void _triggerSwipe(Direction dir) {
|
|
final swipedCallback = widget.onCardSwiped ?? (_, __, ___) => true;
|
|
bool? shouldAnimate = false;
|
|
if (dir == Direction.left) {
|
|
shouldAnimate = swipedCallback(Direction.left, index, cards[0]);
|
|
frontCardAlign = const Alignment(-0.001, 0.0);
|
|
} else if (dir == Direction.right) {
|
|
shouldAnimate = swipedCallback(Direction.right, index, cards[0]);
|
|
frontCardAlign = const Alignment(0.001, 0.0);
|
|
} else if (dir == Direction.up) {
|
|
shouldAnimate = swipedCallback(Direction.up, index, cards[0]);
|
|
frontCardAlign = const Alignment(0.0, -0.001);
|
|
} else if (dir == Direction.down) {
|
|
shouldAnimate = swipedCallback(Direction.down, index, cards[0]);
|
|
frontCardAlign = const Alignment(0.0, 0.001);
|
|
}
|
|
|
|
shouldAnimate ??= true;
|
|
|
|
if (shouldAnimate) {
|
|
animateCards();
|
|
}
|
|
}
|
|
|
|
void _appendItem(Widget newCard) {
|
|
appendCard = newCard;
|
|
}
|
|
|
|
void _enableSwipe(bool isSwipeEnabled) {
|
|
setState(() {
|
|
enableSwipe = isSwipeEnabled;
|
|
});
|
|
}
|
|
|
|
@override
|
|
void initState() {
|
|
super.initState();
|
|
|
|
final cardController = widget.cardController;
|
|
if (cardController != null) {
|
|
cardController.listener = _triggerSwipe;
|
|
cardController.addItem = _appendItem;
|
|
cardController.enableSwipeListener = _enableSwipe;
|
|
}
|
|
|
|
// Init cards
|
|
for (cardsCounter = 0; cardsCounter < 3; cardsCounter++) {
|
|
if (widget.items.isNotEmpty && cardsCounter < widget.items.length) {
|
|
cards.add(widget.items[cardsCounter]);
|
|
} else {
|
|
cards.add(null);
|
|
}
|
|
}
|
|
|
|
frontCardAlign = cardsAlign[2];
|
|
|
|
// Init the animation controller
|
|
_controller = AnimationController(
|
|
duration: const Duration(milliseconds: 700),
|
|
vsync: this,
|
|
);
|
|
_controller.addListener(() => setState(() {}));
|
|
_controller.addStatusListener((AnimationStatus status) {
|
|
if (status == AnimationStatus.completed) changeCardsOrder();
|
|
});
|
|
}
|
|
|
|
@override
|
|
Widget build(BuildContext context) {
|
|
return Expanded(
|
|
child: IgnorePointer(
|
|
ignoring: !enableSwipe,
|
|
child: Stack(
|
|
children: <Widget>[
|
|
if (cards[2] != null) backCard(),
|
|
if (cards[1] != null) middleCard(),
|
|
if (cards[0] != null) frontCard(),
|
|
// Prevent swiping if the cards are animating
|
|
if (_controller.status != AnimationStatus.forward)
|
|
SizedBox.expand(
|
|
child: GestureDetector(
|
|
// While dragging the first card
|
|
onPanUpdate: (DragUpdateDetails details) {
|
|
// Add what the user swiped in the last frame to the alignment of the card
|
|
setState(() {
|
|
frontCardAlign = Alignment(
|
|
frontCardAlign.x +
|
|
20 *
|
|
details.delta.dx /
|
|
MediaQuery.of(context).size.width,
|
|
frontCardAlign.y +
|
|
20 *
|
|
details.delta.dy /
|
|
MediaQuery.of(context).size.height,
|
|
);
|
|
|
|
frontCardRot = frontCardAlign.x; // * rotation speed;
|
|
});
|
|
},
|
|
// When releasing the first card
|
|
onPanEnd: (_) {
|
|
// If the front card was swiped far enough to count as swiped
|
|
final onCardSwiped =
|
|
widget.onCardSwiped ?? (_, __, ___) => true;
|
|
bool? shouldAnimate = false;
|
|
if (frontCardAlign.x > 3.0) {
|
|
shouldAnimate =
|
|
onCardSwiped(Direction.right, index, cards[0]);
|
|
} else if (frontCardAlign.x < -3.0) {
|
|
shouldAnimate =
|
|
onCardSwiped(Direction.left, index, cards[0]);
|
|
} else if (frontCardAlign.y < -3.0 &&
|
|
widget.enableSwipeUp) {
|
|
shouldAnimate =
|
|
onCardSwiped(Direction.up, index, cards[0]);
|
|
} else if (frontCardAlign.y > 3.0 &&
|
|
widget.enableSwipeDown) {
|
|
shouldAnimate =
|
|
onCardSwiped(Direction.down, index, cards[0]);
|
|
} else {
|
|
// Return to the initial rotation and alignment
|
|
setState(() {
|
|
frontCardAlign = defaultFrontCardAlign;
|
|
frontCardRot = 0.0;
|
|
});
|
|
}
|
|
|
|
shouldAnimate ??= true;
|
|
|
|
if (shouldAnimate) {
|
|
animateCards();
|
|
}
|
|
},
|
|
),
|
|
)
|
|
else
|
|
const SizedBox(),
|
|
],
|
|
),
|
|
),
|
|
);
|
|
}
|
|
|
|
Widget backCard() {
|
|
return Align(
|
|
alignment: _controller.status == AnimationStatus.forward
|
|
? CardsAnimation.backCardAlignmentAnim(_controller).value
|
|
: cardsAlign[0],
|
|
child: SizedBox.fromSize(
|
|
size: _controller.status == AnimationStatus.forward
|
|
? CardsAnimation.backCardSizeAnim(_controller).value
|
|
: cardsSize[2],
|
|
child: cards[2],
|
|
),
|
|
);
|
|
}
|
|
|
|
Widget middleCard() {
|
|
return Align(
|
|
alignment: _controller.status == AnimationStatus.forward
|
|
? CardsAnimation.middleCardAlignmentAnim(_controller).value
|
|
: cardsAlign[1],
|
|
child: SizedBox.fromSize(
|
|
size: _controller.status == AnimationStatus.forward
|
|
? CardsAnimation.middleCardSizeAnim(_controller).value
|
|
: cardsSize[1],
|
|
child: cards[1],
|
|
),
|
|
);
|
|
}
|
|
|
|
Widget frontCard() {
|
|
return Align(
|
|
alignment: _controller.status == AnimationStatus.forward
|
|
? CardsAnimation.frontCardDisappearAlignmentAnim(
|
|
_controller,
|
|
frontCardAlign,
|
|
).value
|
|
: frontCardAlign,
|
|
child: Transform.rotate(
|
|
angle: (pi / 180.0) * frontCardRot,
|
|
child: SizedBox.fromSize(size: cardsSize[0], child: cards[0]),
|
|
),
|
|
);
|
|
}
|
|
|
|
void changeCardsOrder() {
|
|
setState(() {
|
|
// Swap cards (back card becomes the middle card; middle card becomes the front card)
|
|
cards[0] = cards[1];
|
|
cards[1] = cards[2];
|
|
cards[2] = appendCard;
|
|
appendCard = null;
|
|
|
|
cardsCounter++;
|
|
index++;
|
|
|
|
frontCardAlign = defaultFrontCardAlign;
|
|
frontCardRot = 0.0;
|
|
});
|
|
}
|
|
|
|
void animateCards() {
|
|
_controller
|
|
..stop()
|
|
..value = 0.0
|
|
..forward();
|
|
}
|
|
}
|
|
|
|
class CardsAnimation {
|
|
static Animation<Alignment> backCardAlignmentAnim(
|
|
AnimationController parent,
|
|
) {
|
|
return AlignmentTween(begin: cardsAlign[0], end: cardsAlign[1]).animate(
|
|
CurvedAnimation(
|
|
parent: parent,
|
|
curve: const Interval(0.4, 0.7, curve: Curves.easeIn),
|
|
),
|
|
);
|
|
}
|
|
|
|
static Animation<Size?> backCardSizeAnim(AnimationController parent) {
|
|
return SizeTween(begin: cardsSize[2], end: cardsSize[1]).animate(
|
|
CurvedAnimation(
|
|
parent: parent,
|
|
curve: const Interval(0.4, 0.7, curve: Curves.easeIn),
|
|
),
|
|
);
|
|
}
|
|
|
|
static Animation<Alignment> middleCardAlignmentAnim(
|
|
AnimationController parent,
|
|
) {
|
|
return AlignmentTween(begin: cardsAlign[1], end: cardsAlign[2]).animate(
|
|
CurvedAnimation(
|
|
parent: parent,
|
|
curve: const Interval(0.2, 0.5, curve: Curves.easeIn),
|
|
),
|
|
);
|
|
}
|
|
|
|
static Animation<Size?> middleCardSizeAnim(AnimationController parent) {
|
|
return SizeTween(begin: cardsSize[1], end: cardsSize[0]).animate(
|
|
CurvedAnimation(
|
|
parent: parent,
|
|
curve: const Interval(0.2, 0.5, curve: Curves.easeIn),
|
|
),
|
|
);
|
|
}
|
|
|
|
static Animation<Alignment> frontCardDisappearAlignmentAnim(
|
|
AnimationController parent,
|
|
Alignment beginAlign,
|
|
) {
|
|
if (beginAlign.x == -0.001 ||
|
|
beginAlign.x == 0.001 ||
|
|
beginAlign.x > 3.0 ||
|
|
beginAlign.x < -3.0) {
|
|
return AlignmentTween(
|
|
begin: beginAlign,
|
|
end: Alignment(
|
|
beginAlign.x > 0 ? beginAlign.x + 30.0 : beginAlign.x - 30.0,
|
|
0.0,
|
|
), // Has swiped to the left or right?
|
|
).animate(
|
|
CurvedAnimation(
|
|
parent: parent,
|
|
curve: const Interval(0.0, 0.5, curve: Curves.easeIn),
|
|
),
|
|
);
|
|
} else {
|
|
return AlignmentTween(
|
|
begin: beginAlign,
|
|
end: Alignment(
|
|
0.0,
|
|
beginAlign.y > 0 ? beginAlign.y + 30.0 : beginAlign.y - 30.0,
|
|
), // Has swiped to the top or bottom?
|
|
).animate(
|
|
CurvedAnimation(
|
|
parent: parent,
|
|
curve: const Interval(0.0, 0.5, curve: Curves.easeIn),
|
|
),
|
|
);
|
|
}
|
|
}
|
|
}
|