slidable_in_depth_02

slidable_in_depth_02.dart

Widget buildStackActions(BuildContext context, SlidableDelegateContext ctx) {
  return new Positioned.fill(
    child: new LayoutBuilder(builder: (context, constraints) {
      final state = ctx.state;
      final count = state.actionCount;
      final bool showActions = ctx.showActions;
      final Animation<double> actionsMoveAnimation =
          state.actionsMoveAnimation;
      final double actionExtent =
          ctx.getMaxExtent(constraints) * state.widget.actionExtentRatio;
      final SlideActionDelegate actionDelegate = state.actionDelegate;

      final animations = Iterable.generate(count).map((index) {
        return new Tween(
          begin: -actionExtent,
          end: (count - index - 1) * actionExtent,
        ).animate(actionsMoveAnimation);
      }).toList();

      return new AnimatedBuilder(
          animation: actionsMoveAnimation,
          builder: (context, child) {
            return new Stack(
              children: List.generate(count, (index) {
                // For the main actions we have to reverse the order if we want the last item at the bottom of the stack.
                int displayIndex = showActions ? count - index - 1 : index;
                return ctx.createPositioned(
                  position: animations[index].value,
                  extent: actionExtent,
                  child: actionDelegate.build(context, displayIndex,
                      actionsMoveAnimation, SlidableRenderingMode.slide),
                );
              }),
            );
          });
    }),
  );
}