Candidates for recyclerview-ktx

[osipxd]

Vote for the candidates that should be added to recyclerview-ktx in your opinion

[osipxd]

To prevent memory leaks would be useful to add a delegate for an adapter clearing on view destroy.
Draft:

class AdapterDelegate<T : RecyclerView.Adapter<VH>, VH : RecyclerView.ViewHolder>(
    private val fragment: Fragment,
    private val adapterFactory: () -> T
) : ReadOnlyProperty<Any?, T>, LifecycleObserver {
​
    private var adapter: T? = null
​
    init {
        fragment.viewLifecycleOwnerLiveData.observe(fragment) { lifecycleOwner ->
            lifecycleOwner.lifecycle.addObserver(this)
        }
    }
​
    @OnLifecycleEvent(Lifecycle.Event.ON_DESTROY)
    fun onViewDestroyed() {
        adapter?.clear()
        adapter = null
    }
​
    override fun getValue(thisRef: Any?, property: KProperty<*>): T {
        return adapter ?: createNewAdapter()
    }
​
    private fun createNewAdapter(): T {
        return adapterFactory.invoke().also { adapter = it }
    }
​
}
​
fun <T : RecyclerView.Adapter<VH>, VH : RecyclerView.ViewHolder> Fragment.adapter(
    adapterFactory: () -> T
): ReadOnlyProperty<Any?, T> {
    return AdapterDelegate(this, adapterFactory)
}

[osipxd]

Getters for non-nullable adapter and layout manager.

inline fun RecyclerView.requireAdapter(): RecyclerView.Adapter<RecyclerView.ViewHolder> = checkNotNull(adapter)

inline fun <reified T : RecyclerView.LayoutManager> RecyclerView.requireLayoutManager(): T {
    return checkNotNull(layoutManager) as T
}

[osipxd]

inline fun RecyclerView.setupLinearLayoutManager(
    @RecyclerView.Orientation orientation: Int = RecyclerView.VERTICAL,
    reverseLayout: Boolean = false,
    configure: LinearLayoutManager.() -> Unit = {},
) {
    layoutManager = LinearLayoutManager(context, orientation, reverseLayout).apply(configure)
}