SwipeDecorator.Kt

private val itemTouchHelperCallback = object : SimpleCallback(
        0, LEFT or RIGHT
    ) {
        override fun onMove(
            recyclerView: RecyclerView,
            viewHolder: ViewHolder,
            target: ViewHolder
        ): Boolean {
            return false
        }

        override fun onSwiped(viewHolder: ViewHolder, direction: Int) {
            val position = viewHolder.layoutPosition
            val semester = semesterAdapter.differ.currentList[position]
            if (direction == LEFT) {
                homeViewModel.deleteSemester(semester.id)
                Snackbar.make(
                    requireView(), "semester deleted",
                    Snackbar.LENGTH_LONG
                ).apply {
                    setAction("Undo") {
                        homeViewModel.insertSemester(semester)
                        homeViewModel.deleteLocallyDeletedSemesterId(semester.id)
                    }
                    show()
                }
            } else if (direction == RIGHT) {
                homeViewModel.observeSemesterById(semester.id).observe(viewLifecycleOwner,
                    Observer {
                        it?.let { semester ->
                            currentSemester = semester
                        }
                    })
                showAddOwnerToSemesterDialog()
            }

        }

        override fun onChildDraw(
            c: Canvas,
            recyclerView: RecyclerView,
            viewHolder: ViewHolder,
            dX: Float,
            dY: Float,
            actionState: Int,
            isCurrentlyActive: Boolean
        ) {
            if (actionState == ACTION_STATE_SWIPE) {
                swipingItem.postValue(isCurrentlyActive)
            }
            setupDecorator(
                c, recyclerView, viewHolder,
                dX, dY, actionState,
                isCurrentlyActive
            )

            super.onChildDraw(
                c,
                recyclerView,
                viewHolder,
                dX / 4,
                dY,
                actionState,
                isCurrentlyActive
            )

        }


    }
fun setupDecorator(
        c: Canvas, recyclerView: RecyclerView,
        viewHolder: RecyclerView.ViewHolder,
        dX: Float, dY: Float, actionState: Int,
        isCurrentlyActive: Boolean
    ) {
        RecyclerViewSwipeDecorator.Builder(
            c,
            recyclerView,
            viewHolder,
            dX,
            dY,
            actionState,
            isCurrentlyActive
        ).addSwipeRightActionIcon(R.drawable.ic_email)
            .addSwipeLeftActionIcon(R.drawable.ic_baseline_delete_24)
            .setSwipeLeftLabelColor(Color.WHITE)
            .setSwipeRightLabelColor(Color.WHITE)
            .addSwipeLeftBackgroundColor(Color.RED)
            .addSwipeRightBackgroundColor(Color.GREEN)
            .create()
            .decorate()
    }
/*swipe decoration library
  implementation 'it.xabaras.android:recyclerview-swipedecorator:1.2.2'
*remember to attach it to the recycleview with 
*ItemTouchHelper(itemTouchHelperCallback) .attachToRecyclerView(this) 
*dx/4 reduces the the width of the backgroun drawn, that is, it won't show the fully drawn background
*ignore my viewmodel code :) */