84 lines
2.8 KiB
Kotlin
84 lines
2.8 KiB
Kotlin
package org.pixeldroid.app.posts.feeds.uncachedFeeds
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import android.os.Bundle
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import android.view.LayoutInflater
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import android.view.View
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import android.view.ViewGroup
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import androidx.lifecycle.ViewModel
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import androidx.lifecycle.ViewModelProvider
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import androidx.lifecycle.lifecycleScope
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import androidx.paging.ExperimentalPagingApi
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import androidx.paging.LoadState
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import androidx.paging.PagingDataAdapter
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import androidx.recyclerview.widget.RecyclerView
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import kotlinx.coroutines.Job
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import kotlinx.coroutines.flow.distinctUntilChangedBy
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import kotlinx.coroutines.flow.filter
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import kotlinx.coroutines.launch
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import org.pixeldroid.app.databinding.FragmentFeedBinding
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import org.pixeldroid.app.posts.feeds.initAdapter
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import org.pixeldroid.app.posts.feeds.launch
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import org.pixeldroid.app.utils.BaseFragment
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import org.pixeldroid.app.utils.api.objects.FeedContent
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/**
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* A fragment representing a list of [FeedContent], not backed by a db cache.
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*/
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open class UncachedFeedFragment<T: FeedContent> : BaseFragment() {
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internal lateinit var viewModel: FeedViewModel<T>
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internal lateinit var adapter: PagingDataAdapter<T, RecyclerView.ViewHolder>
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lateinit var binding: FragmentFeedBinding
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private var job: Job? = null
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internal fun launch() {
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job = launch(job, lifecycleScope, viewModel, adapter)
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}
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internal fun initSearch() {
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// Scroll to top when the list is refreshed from network.
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lifecycleScope.launch {
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adapter.loadStateFlow
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// Only emit when REFRESH LoadState for RemoteMediator changes.
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.distinctUntilChangedBy { it.refresh }
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// Only react to cases where Remote REFRESH completes i.e., NotLoading.
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.filter { it.refresh is LoadState.NotLoading }
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.collect { binding.list.scrollToPosition(0) }
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}
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}
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override fun onCreateView(
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inflater: LayoutInflater, container: ViewGroup?,
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savedInstanceState: Bundle?
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): View? {
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super.onCreateView(inflater, container, savedInstanceState)
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binding = FragmentFeedBinding.inflate(layoutInflater)
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initAdapter(
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binding.progressBar, binding.swipeRefreshLayout, binding.list,
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binding.motionLayout, binding.errorLayout, adapter
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)
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return binding.root
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}
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}
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class ViewModelFactory<U: FeedContent> @ExperimentalPagingApi constructor(
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private val searchContentRepository: UncachedContentRepository<U>
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) : ViewModelProvider.Factory {
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override fun <T : ViewModel> create(modelClass: Class<T>): T {
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if (modelClass.isAssignableFrom(FeedViewModel::class.java)) {
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@Suppress("UNCHECKED_CAST")
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return FeedViewModel(searchContentRepository) as T
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}
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throw IllegalArgumentException("Unknown ViewModel class")
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}
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} |