swipable_stack

A widget for stacking cards, which users can swipe horizontally and vertically with beautiful animations.

Usage

builder

A SwipableStack uses a builder to display widgets.

SwipableStack(
  builder: (context, index, constraints) {
    return Image.asset(imagePath);
  },
),

onSwipeCompleted

You can get completion event with onSwipeCompleted.

SwipableStack(
  onSwipeCompleted: (index, direction) {
    print('$index, $direction');
  },
)

overlayBuilder

You can show overlay on the front card with overlayBuilder.

SwipableStack(
  overlayBuilder: (constraints, direction, valuePerThreshold) {
    final opacity = min(valuePerThreshold, 1.0);
    final isRight = direction == SwipeDirection.right;
    return Opacity(
      opacity: isRight ? opacity : 0,
      child: CardLabel.right(),
    );
  },
)

controller

SwipableStackController allows you to control swipe action & also rewind recent action.

final controller = SwipableStackController();

SwipableStack(
  controller:controller,
  builder: (context, index, constraints) {
    return Image.asset(imagePath);
  },
);
controller.next(
  swipeDirection: SwipeDirection.right,
);
controller.rewind();

SwipableStackController provides to access currentIndex of SwipableStack.

final controller = SwipableStackController();
controller.addListener(() {
  print('${_controller.currentIndex}');
});

onWillMoveNext

You can also restrict user actions according to index or action with onWillMoveNext.

SwipableStack(
  onWillMoveNext: (index, direction) {
    final allowedActions = [
      SwipeDirection.right,
      SwipeDirection.left,
    ];
    return allowedActions.contains(direction);
  },
);

Libraries

swipable_stack