rmyhal

@Composable
private fun FabContainer(
  modifier: Modifier = Modifier,
) {
  var containerState by remember { mutableStateOf(ContainerState.Fab) }
  val transition = updateTransition(targetState = containerState)
  val backgroundColor by transition.animateColor { state ->
    when (state) {
      ContainerState.Fab -> Colors.fabContainerColor
      ContainerState.Fullscreen -> Colors.surface

rmyhal

@Composable
private fun FabContent(
  modifier: Modifier = Modifier,
) {
  var containerState by remember { mutableStateOf(ContainerState.Fab) }
  AnimatedContent(
    modifier = modifier,
    targetState = containerState,
    label = "container transform",
  ) { state ->

rmyhal

Box(
    modifier = Modifier
        .fillMaxSize()
) {
    var containerState by remember { mutableStateOf(ContainerState.Fab) }
    HotTakesContent()
    when (containerState) {
        ContainerState.Fab -> Fab(
            modifier = Modifier
                .align(Aligment.BottomEnd)

rmyhal

override fun onBindViewHolder(
    holder: FragmentViewHolder,
    position: Int,
    payloads: MutableList<Any>
) {
    if (payloads.isNotEmpty()) {
        val tag = "f" + holder.itemId
        val fragment = activity.supportFragmentManager.findFragmentByTag(tag)
        // safe check, but fragment should not be null here
        if (fragment != null) {

rmyhal

class PagerDiffUtil(private val oldList: List<PagerItem>, private val newList: List<PagerItem>) : DiffUtil.Callback() {

    enum class PayloadKey {
        VALUE
    }

    override fun getOldListSize() = oldList.size

    override fun getNewListSize() = newList.size

rmyhal

class PagerAdapter(private val activity: FragmentActivity) : FragmentStateAdapter(activity) {

    private val items: ArrayList<PagerItem> = arrayListOf()

    override fun createFragment(position: Int): Fragment =
        PagerFragment.newInstance(items[position])

    override fun getItemCount() = items.size

    override fun getItemId(position: Int): Long {

rmyhal

class MainActivity : AppCompatActivity(R.layout.activity_main) {

    private lateinit var pagerAdapter: PagerAdapter

    override fun onCreate(savedInstanceState: Bundle?) {
        super.onCreate(savedInstanceState)
        pagerAdapter = PagerAdapter(this)
        viewPager.adapter = pagerAdapter

        pagerAdapter.setItems(generatePagerItems())

rmyhal

class PagerAdapter(private val activity: FragmentActivity) : FragmentStateAdapter(activity) {

    private val items: ArrayList<PagerItem> = arrayListOf()

    override fun createFragment(position: Int): Fragment =
        PagerFragment.newInstance(items[position])

    override fun getItemCount() = items.size

    fun setItems(newItems: List<PagerItem>) {

rmyhal

override fun onCreate(savedInstanceState: Bundle?) {
    setupKoinFragmentFactory()
    super.onCreate(savedInstanceState)
    setContentView(R.layout.activity_main)
}

rmyhal

class KoinFragmentFactory : FragmentFactory() {

    override fun instantiate(classLoader: ClassLoader, className: String): Fragment {
        val clazz = Class.forName(className).kotlin
        val instance = getKoin().getOrNull<Fragment>(clazz)
        return instance ?: super.instantiate(classLoader, className)
    }

}