Fully manga list fragments to AdapterDelegates and mvvm

app/src/main/java/org/koitharu/kotatsu/base/ui/list/PaginationScrollListener.kt

@@ -1,5 +1,6 @@
 package org.koitharu.kotatsu.base.ui.list
 
+import androidx.recyclerview.widget.LinearLayoutManager
 import androidx.recyclerview.widget.RecyclerView
 
 class PaginationScrollListener(offset: Int, private val callback: Callback) :
@@ -10,7 +11,7 @@ class PaginationScrollListener(offset: Int, private val callback: Callback) :
 	override fun onScrolledToStart(recyclerView: RecyclerView) = Unit
 
 	override fun onScrolledToEnd(recyclerView: RecyclerView) {
-		val total = callback.getItemsCount()
+		val total = (recyclerView.layoutManager as? LinearLayoutManager)?.itemCount ?: return
 		if (total > lastTotalCount) {
 			lastTotalCount = total
 			callback.onRequestMoreItems(total)
@@ -27,6 +28,7 @@ class PaginationScrollListener(offset: Int, private val callback: Callback) :
 
 		fun onRequestMoreItems(offset: Int)
 
-		fun getItemsCount(): Int
+		@Deprecated("Not in use")
+		fun getItemsCount(): Int = 0
 	}
 }

app/src/main/java/org/koitharu/kotatsu/core/prefs/AppSettings.kt

@@ -22,7 +22,7 @@ class AppSettings private constructor(private val prefs: SharedPreferences) :
 		PreferenceManager.getDefaultSharedPreferences(context)
 	)
 
-	var listMode by IntEnumPreferenceDelegate(
+	var listMode by EnumPreferenceDelegate(
 		ListMode::class.java,
 		KEY_LIST_MODE,
 		ListMode.DETAILED_LIST
@@ -41,7 +41,7 @@ class AppSettings private constructor(private val prefs: SharedPreferences) :
 
 	val isAmoledTheme by BoolPreferenceDelegate(KEY_THEME_AMOLED, defaultValue = false)
 
-	val gridSize by IntPreferenceDelegate(KEY_GRID_SIZE, defaultValue = 100)
+	var gridSize by IntPreferenceDelegate(KEY_GRID_SIZE, defaultValue = 100)
 
 	val readerPageSwitch by StringSetPreferenceDelegate(
 		KEY_READER_SWITCHERS,
@@ -138,7 +138,7 @@ class AppSettings private constructor(private val prefs: SharedPreferences) :
 		const val TRACK_HISTORY = "history"
 		const val TRACK_FAVOURITES = "favourites"
 
-		const val KEY_LIST_MODE = "list_mode"
+		const val KEY_LIST_MODE = "list_mode_2"
 		const val KEY_APP_SECTION = "app_section"
 		const val KEY_THEME = "theme"
 		const val KEY_THEME_AMOLED = "amoled_theme"

app/src/main/java/org/koitharu/kotatsu/favourites/ui/list/FavouritesListViewModel.kt

@@ -4,6 +4,8 @@ import androidx.lifecycle.asLiveData
 import androidx.lifecycle.viewModelScope
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.flow.combine
+import kotlinx.coroutines.flow.onEach
+import kotlinx.coroutines.flow.onStart
 import org.koitharu.kotatsu.core.model.Manga
 import org.koitharu.kotatsu.core.prefs.AppSettings
 import org.koitharu.kotatsu.core.prefs.ListMode
@@ -12,6 +14,7 @@ import org.koitharu.kotatsu.list.ui.MangaListViewModel
 import org.koitharu.kotatsu.list.ui.model.toGridModel
 import org.koitharu.kotatsu.list.ui.model.toListDetailedModel
 import org.koitharu.kotatsu.list.ui.model.toListModel
+import org.koitharu.kotatsu.utils.ext.onFirst
 
 class FavouritesListViewModel(
 	private val categoryId: Long,
@@ -28,6 +31,12 @@ class FavouritesListViewModel(
 			ListMode.DETAILED_LIST -> list.map { it.toListDetailedModel() }
 			ListMode.GRID -> list.map { it.toGridModel() }
 		}
+	}.onEach {
+		isEmptyState.postValue(it.isEmpty())
+	}.onStart {
+		isLoading.postValue(true)
+	}.onFirst {
+		isLoading.postValue(false)
 	}.asLiveData(viewModelScope.coroutineContext + Dispatchers.Default)
 
 	fun removeFromFavourites(manga: Manga) {

app/src/main/java/org/koitharu/kotatsu/history/ui/HistoryListViewModel.kt

@@ -6,6 +6,8 @@ import androidx.lifecycle.asLiveData
 import androidx.lifecycle.viewModelScope
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.flow.combine
+import kotlinx.coroutines.flow.onEach
+import kotlinx.coroutines.flow.onStart
 import org.koitharu.kotatsu.core.model.Manga
 import org.koitharu.kotatsu.core.prefs.AppSettings
 import org.koitharu.kotatsu.core.prefs.ListMode
@@ -16,6 +18,7 @@ import org.koitharu.kotatsu.list.ui.model.toListDetailedModel
 import org.koitharu.kotatsu.list.ui.model.toListModel
 import org.koitharu.kotatsu.utils.MangaShortcut
 import org.koitharu.kotatsu.utils.SingleLiveEvent
+import org.koitharu.kotatsu.utils.ext.onFirst
 
 class HistoryListViewModel(
 	private val repository: HistoryRepository,
@@ -34,6 +37,12 @@ class HistoryListViewModel(
 			ListMode.DETAILED_LIST -> list.map { it.toListDetailedModel() }
 			ListMode.GRID -> list.map { it.toGridModel() }
 		}
+	}.onEach {
+		isEmptyState.postValue(it.isEmpty())
+	}.onStart {
+		isLoading.postValue(true)
+	}.onFirst {
+		isLoading.postValue(false)
 	}.asLiveData(viewModelScope.coroutineContext + Dispatchers.Default)
 
 	fun clearHistory() {

app/src/main/java/org/koitharu/kotatsu/list/ui/ListModeSelectDialog.kt

@@ -2,6 +2,7 @@ package org.koitharu.kotatsu.list.ui
 
 import android.os.Bundle
 import android.view.View
+import android.widget.SeekBar
 import androidx.appcompat.app.AlertDialog
 import androidx.fragment.app.FragmentManager
 import kotlinx.android.synthetic.main.dialog_list_mode.*
@@ -11,19 +12,23 @@ import org.koitharu.kotatsu.base.ui.AlertDialogFragment
 import org.koitharu.kotatsu.core.prefs.AppSettings
 import org.koitharu.kotatsu.core.prefs.ListMode
 
-class ListModeSelectDialog : AlertDialogFragment(R.layout.dialog_list_mode), View.OnClickListener {
+class ListModeSelectDialog : AlertDialogFragment(R.layout.dialog_list_mode), View.OnClickListener,
+	SeekBar.OnSeekBarChangeListener {
 
 	private val settings by inject<AppSettings>()
 
-	private lateinit var mode: ListMode
+	private var mode: ListMode = ListMode.GRID
+	private var pendingGridSize: Int = 100
 
 	override fun onCreate(savedInstanceState: Bundle?) {
 		super.onCreate(savedInstanceState)
 		mode = settings.listMode
+		pendingGridSize = settings.gridSize
 	}
 
 	override fun onBuildDialog(builder: AlertDialog.Builder) {
 		builder.setTitle(R.string.list_mode)
+			.setPositiveButton(R.string.done, null)
 			.setCancelable(true)
 	}
 
@@ -33,22 +38,33 @@ class ListModeSelectDialog : AlertDialogFragment(R.layout.dialog_list_mode), Vie
 		button_list_detailed.isChecked = mode == ListMode.DETAILED_LIST
 		button_grid.isChecked = mode == ListMode.GRID
 
-		button_ok.setOnClickListener(this)
+		with(seekbar_grid) {
+			progress = pendingGridSize - 50
+			setOnSeekBarChangeListener(this@ListModeSelectDialog)
+		}
+
 		button_list.setOnClickListener(this)
 		button_grid.setOnClickListener(this)
 		button_list_detailed.setOnClickListener(this)
 	}
 
+	override fun onProgressChanged(seekBar: SeekBar?, progress: Int, fromUser: Boolean) {
+		pendingGridSize = progress + 50
+	}
+
+	override fun onStartTrackingTouch(seekBar: SeekBar?) = Unit
+
+	override fun onStopTrackingTouch(seekBar: SeekBar?) {
+		settings.gridSize = pendingGridSize
+	}
+
 	override fun onClick(v: View) {
 		when (v.id) {
-			R.id.button_ok -> {
-				settings.listMode = mode
-				dismiss()
-			}
 			R.id.button_list -> mode = ListMode.LIST
 			R.id.button_list_detailed -> mode = ListMode.DETAILED_LIST
 			R.id.button_grid -> mode = ListMode.GRID
 		}
+		settings.listMode = mode
 	}
 
 	companion object {

app/src/main/java/org/koitharu/kotatsu/list/ui/MangaListFragment.kt

@@ -32,8 +32,10 @@ import org.koitharu.kotatsu.details.ui.DetailsActivity
 import org.koitharu.kotatsu.list.ui.adapter.MangaListAdapter
 import org.koitharu.kotatsu.list.ui.filter.FilterAdapter
 import org.koitharu.kotatsu.list.ui.filter.OnFilterChangedListener
-import org.koitharu.kotatsu.utils.UiUtils
-import org.koitharu.kotatsu.utils.ext.*
+import org.koitharu.kotatsu.utils.ext.clearItemDecorations
+import org.koitharu.kotatsu.utils.ext.getDisplayMessage
+import org.koitharu.kotatsu.utils.ext.hasItems
+import org.koitharu.kotatsu.utils.ext.toggleDrawer
 
 abstract class MangaListFragment : BaseFragment(R.layout.fragment_list),
 	PaginationScrollListener.Callback, OnListItemClickListener<Manga>, OnFilterChangedListener,
@@ -41,7 +43,8 @@ abstract class MangaListFragment : BaseFragment(R.layout.fragment_list),
 
 	private var adapter: MangaListAdapter? = null
 	private var paginationListener: PaginationScrollListener? = null
-	private val spanResolver: MangaListSpanResolver? = null
+	private val spanResolver = MangaListSpanResolver()
+	private val spanSizeLookup = SpanSizeLookup()
 	protected var isSwipeRefreshEnabled = true
 
 	protected abstract val viewModel: MangaListViewModel
@@ -70,11 +73,13 @@ abstract class MangaListFragment : BaseFragment(R.layout.fragment_list),
 		viewModel.isLoading.observe(viewLifecycleOwner, ::onLoadingStateChanged)
 		viewModel.listMode.observe(viewLifecycleOwner, ::onListModeChanged)
 		viewModel.gridScale.observe(viewLifecycleOwner, ::onGridScaleChanged)
+		viewModel.isEmptyState.observe(viewLifecycleOwner, ::onEmptyStateChanged)
 	}
 
 	override fun onDestroyView() {
 		adapter = null
 		paginationListener = null
+		spanSizeLookup.invalidateCache()
 		super.onDestroyView()
 	}
 
@@ -126,24 +131,15 @@ abstract class MangaListFragment : BaseFragment(R.layout.fragment_list),
 	}
 
 	private fun onListChanged(list: List<Any>) {
+		spanSizeLookup.invalidateCache()
 		adapter?.items = list
-		if (list.isEmpty()) {
-			setUpEmptyListHolder()
-			layout_holder.isVisible = true
-		} else {
-			layout_holder.isVisible = false
-		}
-		recyclerView.callOnScrollListeners()
 	}
 
 	private fun onError(e: Throwable) {
 		if (e is CloudFlareProtectedException) {
 			CloudFlareDialog.newInstance(e.url).show(childFragmentManager, CloudFlareDialog.TAG)
 		}
-		if (recyclerView.hasItems) {
-			Snackbar.make(recyclerView, e.getDisplayMessage(resources), Snackbar.LENGTH_SHORT)
-				.show()
-		} else {
+		if (viewModel.isEmptyState.value == true) {
 			textView_holder.text = e.getDisplayMessage(resources)
 			textView_holder.setCompoundDrawablesRelativeWithIntrinsicBounds(
 				0,
@@ -152,21 +148,29 @@ abstract class MangaListFragment : BaseFragment(R.layout.fragment_list),
 				0
 			)
 			layout_holder.isVisible = true
+		} else {
+			Snackbar.make(recyclerView, e.getDisplayMessage(resources), Snackbar.LENGTH_SHORT)
+				.show()
 		}
 	}
 
 	@CallSuper
 	protected open fun onLoadingStateChanged(isLoading: Boolean) {
 		val hasItems = recyclerView.hasItems
-		progressBar.isVisible = isLoading && !hasItems
+		progressBar.isVisible = isLoading && !hasItems && viewModel.isEmptyState.value != true
 		swipeRefreshLayout.isEnabled = isSwipeRefreshEnabled && !progressBar.isVisible
-		if (isLoading) {
-			layout_holder.isVisible = false
-		} else {
+		if (!isLoading) {
 			swipeRefreshLayout.isRefreshing = false
 		}
 	}
 
+	private fun onEmptyStateChanged(isEmpty: Boolean) {
+		if (isEmpty) {
+			setUpEmptyListHolder()
+		}
+		layout_holder.isVisible = isEmpty
+	}
+
 	protected fun onInitFilter(config: MangaFilterConfig) {
 		recyclerView_filter.adapter = FilterAdapter(
 			sortOrders = config.sortOrders,
@@ -198,12 +202,15 @@ abstract class MangaListFragment : BaseFragment(R.layout.fragment_list),
 	}
 
 	private fun onGridScaleChanged(scale: Float) {
-		UiUtils.SpanCountResolver.update(recyclerView)
+		spanSizeLookup.invalidateCache()
+		spanResolver.setGridSize(scale, recyclerView)
 	}
 
 	private fun onListModeChanged(mode: ListMode) {
+		spanSizeLookup.invalidateCache()
 		with(recyclerView) {
 			clearItemDecorations()
+			removeOnLayoutChangeListener(spanResolver)
 			when (mode) {
 				ListMode.LIST -> {
 					layoutManager = LinearLayoutManager(context)
@@ -216,52 +223,27 @@ abstract class MangaListFragment : BaseFragment(R.layout.fragment_list),
 				}
 				ListMode.DETAILED_LIST -> {
 					layoutManager = LinearLayoutManager(context)
-				}
-				ListMode.GRID -> {
-					layoutManager = GridLayoutManager(context, 3)
 					addItemDecoration(
 						SpacingItemDecoration(
 							resources.getDimensionPixelOffset(R.dimen.grid_spacing)
 						)
 					)
 				}
-			}
-		}
-	}
-
-	private fun initListMode(mode: ListMode) {
-		val ctx = context ?: return
-		recyclerView.layoutManager = null
-		recyclerView.clearItemDecorations()
-		recyclerView.removeOnLayoutChangeListener(UiUtils.SpanCountResolver)
-		recyclerView.layoutManager = when (mode) {
-			ListMode.GRID -> {
-				GridLayoutManager(ctx, UiUtils.resolveGridSpanCount(ctx)).apply {
-					spanSizeLookup = object : GridLayoutManager.SpanSizeLookup() {
-						override fun getSpanSize(position: Int) = if (position < getItemsCount())
-							1 else this@apply.spanCount
+				ListMode.GRID -> {
+					layoutManager = GridLayoutManager(context, spanResolver.spanCount).also {
+						it.spanSizeLookup = spanSizeLookup
 					}
+					addItemDecoration(
+						SpacingItemDecoration(
+							resources.getDimensionPixelOffset(R.dimen.grid_spacing)
+						)
+					)
+					addOnLayoutChangeListener(spanResolver)
 				}
 			}
-			else -> LinearLayoutManager(ctx)
 		}
-		recyclerView.addItemDecoration(
-			when (mode) {
-				ListMode.LIST -> DividerItemDecoration(ctx, RecyclerView.VERTICAL)
-				ListMode.DETAILED_LIST,
-				ListMode.GRID -> SpacingItemDecoration(
-					resources.getDimensionPixelOffset(R.dimen.grid_spacing)
-				)
-			}
-		)
-		if (mode == ListMode.GRID) {
-			recyclerView.addOnLayoutChangeListener(UiUtils.SpanCountResolver)
-		}
-		adapter?.notifyDataSetChanged()
 	}
 
-	override fun getItemsCount() = adapter?.itemCount ?: 0
-
 	final override fun isSection(position: Int): Boolean {
 		return position == 0 || recyclerView_filter.adapter?.run {
 			getItemViewType(position) != getItemViewType(position - 1)
@@ -279,4 +261,25 @@ abstract class MangaListFragment : BaseFragment(R.layout.fragment_list),
 	protected open fun onCreatePopupMenu(inflater: MenuInflater, menu: Menu, data: Manga) = Unit
 
 	protected open fun onPopupMenuItemSelected(item: MenuItem, data: Manga) = false
+
+	private inner class SpanSizeLookup : GridLayoutManager.SpanSizeLookup() {
+
+		init {
+			isSpanIndexCacheEnabled = true
+			isSpanGroupIndexCacheEnabled = true
+		}
+
+		override fun getSpanSize(position: Int): Int {
+			val total = (recyclerView.layoutManager as? GridLayoutManager)?.spanCount ?: return 1
+			return when(adapter?.getItemViewType(position)) {
+				MangaListAdapter.ITEM_TYPE_PROGRESS -> total
+				else -> 1
+			}
+		}
+
+		fun invalidateCache() {
+			invalidateSpanGroupIndexCache()
+			invalidateSpanIndexCache()
+		}
+	}
 }

app/src/main/java/org/koitharu/kotatsu/list/ui/MangaListSpanResolver.kt

@@ -1,26 +1,20 @@
 package org.koitharu.kotatsu.list.ui
 
-import android.content.Context
 import android.view.View
 import androidx.recyclerview.widget.GridLayoutManager
 import androidx.recyclerview.widget.RecyclerView
 import org.koitharu.kotatsu.R
-import org.koitharu.kotatsu.list.ui.adapter.MangaListAdapter
 import kotlin.math.abs
 import kotlin.math.roundToInt
 
-class MangaListSpanResolver(
-	context: Context,
-	private val adapter: MangaListAdapter
-) : GridLayoutManager.SpanSizeLookup(), View.OnLayoutChangeListener {
+class MangaListSpanResolver : View.OnLayoutChangeListener {
 
-	private val gridWidth = context.resources.getDimension(R.dimen.preferred_grid_width)
+	var spanCount = 3
+		private set
+
+	private var gridWidth = -1f
 	private var cellWidth = -1f
 
-	override fun getSpanSize(position: Int) = when(adapter.getItemViewType(position)) {
-		else -> 1
-	}
-
 	override fun onLayoutChange(
 		v: View?,
 		left: Int,
@@ -36,20 +30,33 @@ class MangaListSpanResolver(
 			return
 		}
 		val rv = v as? RecyclerView ?: return
+		if (gridWidth < 0f) {
+			gridWidth = rv.resources.getDimension(R.dimen.preferred_grid_width)
+		}
 		val width = abs(right - left)
 		if (width == 0) {
 			return
 		}
-		(rv.layoutManager as? GridLayoutManager)?.spanCount = resolveGridSpanCount(width)
+		resolveGridSpanCount(width)
+		(rv.layoutManager as? GridLayoutManager)?.spanCount = spanCount
 	}
 
-	fun setGridSize(gridSize: Int) {
-		val scaleFactor = gridSize / 100f
+	fun setGridSize(scaleFactor: Float, rv: RecyclerView?) {
+		if (gridWidth < 0f) {
+			gridWidth = (rv ?: return).resources.getDimension(R.dimen.preferred_grid_width)
+		}
 		cellWidth = gridWidth * scaleFactor
+		if (rv != null) {
+			val width = rv.width
+			if (width != 0) {
+				resolveGridSpanCount(width)
+				(rv.layoutManager as? GridLayoutManager)?.spanCount = spanCount
+			}
+		}
 	}
 
-	private fun resolveGridSpanCount(width: Int): Int {
+	private fun resolveGridSpanCount(width: Int) {
 		val estimatedCount = (width / cellWidth).roundToInt()
-		return estimatedCount.coerceAtLeast(2)
+		spanCount = estimatedCount.coerceAtLeast(2)
 	}
 }

app/src/main/java/org/koitharu/kotatsu/list/ui/MangaListViewModel.kt

@@ -15,11 +15,13 @@ abstract class MangaListViewModel(
 ) : BaseViewModel() {
 
 	abstract val content: LiveData<List<Any>>
+	val isEmptyState = MutableLiveData(false)
 	val filter = MutableLiveData<MangaFilterConfig>()
 	val listMode = MutableLiveData<ListMode>()
 	val gridScale = settings.observe()
 		.filter { it == AppSettings.KEY_GRID_SIZE }
 		.map { settings.gridSize / 100f }
+		.onStart { emit(settings.gridSize / 100f) }
 		.asLiveData(viewModelScope.coroutineContext + Dispatchers.IO)
 
 	protected fun createListModeFlow() = settings.observe()

app/src/main/java/org/koitharu/kotatsu/list/ui/adapter/MangaListAdapter.kt

@@ -14,16 +14,16 @@ import kotlin.jvm.internal.Intrinsics
 class MangaListAdapter(
 	coil: ImageLoader,
 	clickListener: OnListItemClickListener<Manga>
-) : AsyncListDifferDelegationAdapter<Any>(DiffCallback) {
+) : AsyncListDifferDelegationAdapter<Any>(DiffCallback()) {
 
 	init {
-		delegatesManager.addDelegate(mangaListItemAD(coil, clickListener))
-			.addDelegate(mangaListDetailedItemAD(coil, clickListener))
-			.addDelegate(mangaGridItemAD(coil, clickListener))
-			.addDelegate(indeterminateProgressAD())
+		delegatesManager.addDelegate(ITEM_TYPE_MANGA_LIST, mangaListItemAD(coil, clickListener))
+			.addDelegate(ITEM_TYPE_MANGA_LIST_DETAILED, mangaListDetailedItemAD(coil, clickListener))
+			.addDelegate(ITEM_TYPE_MANGA_GRID, mangaGridItemAD(coil, clickListener))
+			.addDelegate(ITEM_TYPE_PROGRESS, indeterminateProgressAD())
 	}
 
-	private companion object DiffCallback : DiffUtil.ItemCallback<Any>() {
+	private class DiffCallback : DiffUtil.ItemCallback<Any>() {
 
 		override fun areItemsTheSame(oldItem: Any, newItem: Any) = when {
 			oldItem is MangaListModel && newItem is MangaListModel -> {
@@ -44,6 +44,13 @@ class MangaListAdapter(
 		override fun areContentsTheSame(oldItem: Any, newItem: Any): Boolean {
 			return Intrinsics.areEqual(oldItem, newItem)
 		}
+	}
 
+	companion object {
+
+		const val ITEM_TYPE_MANGA_LIST = 0
+		const val ITEM_TYPE_MANGA_LIST_DETAILED = 1
+		const val ITEM_TYPE_MANGA_GRID = 2
+		const val ITEM_TYPE_PROGRESS = 3
 	}
 }

app/src/main/java/org/koitharu/kotatsu/local/ui/LocalListViewModel.kt

@@ -55,7 +55,7 @@ class LocalListViewModel(
 	fun importFile(uri: Uri) {
 		launchLoadingJob {
 			val contentResolver = context.contentResolver
-			val list = withContext(Dispatchers.Default) {
+			withContext(Dispatchers.Default) {
 				val name = MediaStoreCompat.getName(contentResolver, uri)
 					?: throw IOException("Cannot fetch name from uri: $uri")
 				if (!LocalMangaRepository.isFileSupported(name)) {
@@ -92,7 +92,9 @@ class LocalListViewModel(
 	private fun loadList() {
 		launchLoadingJob {
 			withContext(Dispatchers.Default) {
-				mangaList.value = repository.getList(0)
+				val list = repository.getList(0)
+				mangaList.value = list
+				isEmptyState.postValue(list.isEmpty())
 			}
 		}
 	}

app/src/main/java/org/koitharu/kotatsu/reader/ui/ReaderConfigDialog.kt

@@ -4,7 +4,6 @@ import android.os.Bundle
 import android.view.View
 import androidx.appcompat.app.AlertDialog
 import androidx.fragment.app.FragmentManager
-import kotlinx.android.synthetic.main.dialog_list_mode.button_ok
 import kotlinx.android.synthetic.main.dialog_reader_config.*
 import org.koitharu.kotatsu.R
 import org.koitharu.kotatsu.base.ui.AlertDialogFragment

app/src/main/java/org/koitharu/kotatsu/remotelist/ui/RemoteListViewModel.kt

@@ -3,8 +3,11 @@ package org.koitharu.kotatsu.remotelist.ui
 import androidx.lifecycle.asLiveData
 import androidx.lifecycle.viewModelScope
 import kotlinx.coroutines.Dispatchers
+import kotlinx.coroutines.Job
 import kotlinx.coroutines.flow.MutableStateFlow
 import kotlinx.coroutines.flow.combine
+import kotlinx.coroutines.flow.drop
+import kotlinx.coroutines.flow.onEach
 import kotlinx.coroutines.withContext
 import org.koitharu.kotatsu.BuildConfig
 import org.koitharu.kotatsu.core.model.Manga
@@ -27,13 +30,16 @@ class RemoteListViewModel(
 	private val mangaList = MutableStateFlow<List<Manga>>(emptyList())
 	private val hasNextPage = MutableStateFlow(false)
 	private var appliedFilter: MangaFilter? = null
+	private var loadingJob: Job? = null
 
-	override val content = combine(mangaList, createListModeFlow()) { list, mode ->
+	override val content = combine(mangaList.drop(1), createListModeFlow()) { list, mode ->
 		when(mode) {
 			ListMode.LIST -> list.map { it.toListModel() }
 			ListMode.DETAILED_LIST -> list.map { it.toListDetailedModel() }
 			ListMode.GRID -> list.map { it.toGridModel() }
 		}
+	}.onEach {
+		isEmptyState.postValue(it.isEmpty())
 	}.combine(hasNextPage) { list, isHasNextPage ->
 		if (isHasNextPage && list.isNotEmpty()) list + IndeterminateProgress else list
 	}.asLiveData(viewModelScope.coroutineContext + Dispatchers.Default)
@@ -44,7 +50,10 @@ class RemoteListViewModel(
 	}
 
 	fun loadList(offset: Int) {
-		launchLoadingJob {
+		if (loadingJob?.isActive == true) {
+			return
+		}
+		loadingJob = launchLoadingJob {
 			withContext(Dispatchers.Default) {
 				val list = repository.getList(
 					offset = offset,

app/src/main/java/org/koitharu/kotatsu/settings/MainSettingsFragment.kt

@@ -9,7 +9,6 @@ import android.provider.Settings
 import android.text.InputType
 import android.view.View
 import androidx.appcompat.app.AppCompatDelegate
-import androidx.collection.arrayMapOf
 import androidx.preference.*
 import com.google.android.material.snackbar.Snackbar
 import kotlinx.coroutines.launch
@@ -22,7 +21,6 @@ import org.koitharu.kotatsu.core.model.MangaSource
 import org.koitharu.kotatsu.core.model.ZoomMode
 import org.koitharu.kotatsu.core.prefs.AppSettings
 import org.koitharu.kotatsu.core.prefs.ListMode
-import org.koitharu.kotatsu.list.ui.ListModeSelectDialog
 import org.koitharu.kotatsu.settings.utils.MultiSummaryProvider
 import org.koitharu.kotatsu.tracker.work.TrackWorker
 import org.koitharu.kotatsu.utils.ext.getStorageName
@@ -38,12 +36,6 @@ class MainSettingsFragment : BasePreferenceFragment(R.string.settings),
 
 	override fun onCreatePreferences(savedInstanceState: Bundle?, rootKey: String?) {
 		addPreferencesFromResource(R.xml.pref_main)
-	}
-
-	override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
-		super.onViewCreated(view, savedInstanceState)
-		findPreference<Preference>(AppSettings.KEY_LIST_MODE)?.summary =
-			LIST_MODES[settings.listMode]?.let(::getString)
 		findPreference<SeekBarPreference>(AppSettings.KEY_GRID_SIZE)?.run {
 			summary = "%d%%".format(value)
 			setOnPreferenceChangeListener { preference, newValue ->
@@ -55,6 +47,18 @@ class MainSettingsFragment : BasePreferenceFragment(R.string.settings),
 			MultiSummaryProvider(R.string.gestures_only)
 		findPreference<MultiSelectListPreference>(AppSettings.KEY_TRACK_SOURCES)?.summaryProvider =
 			MultiSummaryProvider(R.string.dont_check)
+		findPreference<ListPreference>(AppSettings.KEY_ZOOM_MODE)?.run {
+			entryValues = ZoomMode.values().names()
+			setDefaultValue(ZoomMode.FIT_CENTER.name)
+		}
+		findPreference<ListPreference>(AppSettings.KEY_LIST_MODE)?.run {
+			entryValues = ListMode.values().names()
+			setDefaultValue(ListMode.GRID.name)
+		}
+	}
+
+	override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
+		super.onViewCreated(view, savedInstanceState)
 		findPreference<Preference>(AppSettings.KEY_APP_UPDATE_AUTO)?.run {
 			isVisible = AppUpdateChecker.isUpdateSupported(context)
 		}
@@ -62,10 +66,6 @@ class MainSettingsFragment : BasePreferenceFragment(R.string.settings),
 			summary = settings.getStorageDir(context)?.getStorageName(context)
 				?: getString(R.string.not_available)
 		}
-		findPreference<ListPreference>(AppSettings.KEY_ZOOM_MODE)?.let {
-			it.entryValues = ZoomMode.values().names()
-			it.setDefaultValue(ZoomMode.FIT_CENTER.name)
-		}
 		findPreference<SwitchPreference>(AppSettings.KEY_PROTECT_APP)?.isChecked =
 			!settings.appPassword.isNullOrEmpty()
 		findPreference<Preference>(AppSettings.KEY_APP_VERSION)?.run {
@@ -82,8 +82,6 @@ class MainSettingsFragment : BasePreferenceFragment(R.string.settings),
 
 	override fun onSharedPreferenceChanged(sharedPreferences: SharedPreferences, key: String?) {
 		when (key) {
-			AppSettings.KEY_LIST_MODE -> findPreference<Preference>(key)?.summary =
-				LIST_MODES[settings.listMode]?.let(::getString)
 			AppSettings.KEY_THEME -> {
 				AppCompatDelegate.setDefaultNightMode(settings.theme)
 			}
@@ -111,10 +109,6 @@ class MainSettingsFragment : BasePreferenceFragment(R.string.settings),
 
 	override fun onPreferenceTreeClick(preference: Preference?): Boolean {
 		return when (preference?.key) {
-			AppSettings.KEY_LIST_MODE -> {
-				ListModeSelectDialog.show(childFragmentManager)
-				true
-			}
 			AppSettings.KEY_NOTIFICATIONS_SETTINGS -> {
 				if (Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
 					val intent = Intent(Settings.ACTION_CHANNEL_NOTIFICATION_SETTINGS)
@@ -224,13 +218,4 @@ class MainSettingsFragment : BasePreferenceFragment(R.string.settings),
 			}
 		}
 	}
-
-	private companion object {
-
-		val LIST_MODES = arrayMapOf(
-			ListMode.DETAILED_LIST to R.string.detailed_list,
-			ListMode.GRID to R.string.grid,
-			ListMode.LIST to R.string.list
-		)
-	}
 }

app/src/main/java/org/koitharu/kotatsu/settings/ReaderSettingsFragment.kt

@@ -1,7 +1,6 @@
 package org.koitharu.kotatsu.settings
 
 import android.os.Bundle
-import android.view.View
 import androidx.preference.ListPreference
 import androidx.preference.MultiSelectListPreference
 import org.koitharu.kotatsu.R
@@ -15,10 +14,6 @@ class ReaderSettingsFragment : BasePreferenceFragment(R.string.reader_settings)
 
 	override fun onCreatePreferences(savedInstanceState: Bundle?, rootKey: String?) {
 		addPreferencesFromResource(R.xml.pref_reader)
-	}
-
-	override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
-		super.onViewCreated(view, savedInstanceState)
 		findPreference<MultiSelectListPreference>(AppSettings.KEY_READER_SWITCHERS)?.let {
 			it.summaryProvider = MultiSummaryProvider(R.string.gestures_only)
 		}

app/src/main/res/layout/dialog_list_mode.xml

@@ -2,14 +2,15 @@
 <LinearLayout
 	xmlns:android="http://schemas.android.com/apk/res/android"
 	xmlns:app="http://schemas.android.com/apk/res-auto"
+	xmlns:tools="http://schemas.android.com/tools"
 	android:layout_width="match_parent"
 	android:layout_height="wrap_content"
-	android:padding="16dp"
 	android:orientation="vertical">
 
 	<com.google.android.material.button.MaterialButtonToggleGroup
 		android:layout_width="match_parent"
 		android:layout_height="wrap_content"
+		android:layout_margin="16dp"
 		android:orientation="vertical"
 		app:selectionRequired="true"
 		app:singleSelection="true">
@@ -40,12 +41,21 @@
 
 	</com.google.android.material.button.MaterialButtonToggleGroup>
 
-	<com.google.android.material.button.MaterialButton
-		android:id="@+id/button_ok"
-		style="@style/Widget.MaterialComponents.Button"
-		android:layout_width="wrap_content"
+	<TextView
+		style="?android:attr/windowTitleStyle"
+		android:layout_width="match_parent"
 		android:layout_height="wrap_content"
-		android:layout_marginTop="16dp"
-		android:layout_gravity="center_horizontal"
-		android:text="@android:string/ok" />
+		android:paddingLeft="?attr/dialogPreferredPadding"
+		android:paddingRight="?attr/dialogPreferredPadding"
+		android:singleLine="true"
+		android:text="@string/grid_size" />
+
+	<SeekBar
+		android:id="@+id/seekbar_grid"
+		android:layout_width="match_parent"
+		android:layout_height="wrap_content"
+		android:layout_margin="16dp"
+		android:max="100"
+		tools:progress="50" />
+
 </LinearLayout>

app/src/main/res/values/arrays.xml

@@ -19,4 +19,9 @@
 		<item>@string/favourites</item>
 		<item>@string/history</item>
 	</string-array>
+	<string-array name="list_modes">
+		<item>@string/list</item>
+		<item>@string/detailed_list</item>
+		<item>@string/grid</item>
+	</string-array>
 </resources>

app/src/main/res/values/styles.xml

@@ -8,6 +8,13 @@
 		<item name="android:paddingBottom">10dp</item>
 	</style>
 
+	<style name="AppToggleButton.Vertical" parent="Widget.MaterialComponents.Button.OutlinedButton">
+		<item name="android:checkable">true</item>
+		<item name="android:gravity">center_horizontal</item>
+		<item name="iconPadding">6dp</item>
+		<item name="iconGravity">top</item>
+	</style>
+
 	<style name="AppPopupTheme" parent="ThemeOverlay.MaterialComponents.Light" />
 
 	<style name="AppToolbarTheme" parent="ThemeOverlay.MaterialComponents.Dark.ActionBar">

app/src/main/res/xml/pref_main.xml

@@ -20,10 +20,11 @@
 		android:title="@string/black_dark_theme"
 		app:iconSpaceReserved="false" />
 
-	<Preference
-		android:key="list_mode"
-		android:persistent="false"
+	<ListPreference
+		android:key="list_mode_2"
+		android:entries="@array/list_modes"
 		android:title="@string/list_mode"
+		app:useSimpleSummaryProvider="true"
 		app:allowDividerAbove="true"
 		app:iconSpaceReserved="false" />