override fun onItemRangeInserted()

in build-android-start/app/src/main/java/com/google/firebase/codelab/friendlychat/MyScrollToBottomObserver.kt [27:39]

• 10 lines of code
• 4 McCabe index (conditional complexity)

    override fun onItemRangeInserted(positionStart: Int, itemCount: Int) {
        super.onItemRangeInserted(positionStart, itemCount)
        val count = adapter.itemCount
        val lastVisiblePosition = manager.findLastCompletelyVisibleItemPosition()
        // If the recycler view is initially being loaded or the
        // user is at the bottom of the list, scroll to the bottom
        // of the list to show the newly added message.
        val loading = lastVisiblePosition == -1
        val atBottom = positionStart >= count - 1 && lastVisiblePosition == positionStart - 1
        if (loading || atBottom) {
            recycler.scrollToPosition(positionStart)
        }
    }