Migrate details to AdapterDelegates and mvvm

app/src/main/java/org/koitharu/kotatsu/base/domain/MangaDataRepository.kt

@@ -32,6 +32,12 @@ class MangaDataRepository(private val db: MangaDatabase) {
 		return db.mangaDao.find(mangaId)?.toManga()
 	}
 
+	suspend fun resolveIntent(intent: MangaIntent): Manga? = when {
+		intent.manga != null -> intent.manga
+		intent.mangaId != MangaIntent.ID_NONE -> db.mangaDao.find(intent.mangaId)?.toManga()
+		else -> null // TODO resolve uri
+	}
+
 	suspend fun storeManga(manga: Manga) {
 		val tags = manga.tags.map(TagEntity.Companion::fromMangaTag)
 		db.withTransaction {

app/src/main/java/org/koitharu/kotatsu/base/domain/MangaIntent.kt

@@ -0,0 +1,33 @@
+package org.koitharu.kotatsu.base.domain
+
+import android.content.Intent
+import android.net.Uri
+import android.os.Bundle
+import org.koitharu.kotatsu.core.model.Manga
+
+data class MangaIntent(
+	val manga: Manga?,
+	val mangaId: Long,
+	val uri: Uri?
+) {
+
+	companion object {
+
+		fun from(intent: Intent?) = MangaIntent(
+			manga = intent?.getParcelableExtra(KEY_MANGA),
+			mangaId = intent?.getLongExtra(KEY_ID, ID_NONE) ?: ID_NONE,
+			uri = intent?.data
+		)
+
+		fun from(args: Bundle?) = MangaIntent(
+			manga = args?.getParcelable(KEY_MANGA),
+			mangaId = args?.getLong(KEY_ID, ID_NONE) ?: ID_NONE,
+			uri = null
+		)
+
+		const val ID_NONE = 0L
+
+		const val KEY_MANGA = "manga"
+		const val KEY_ID = "id"
+	}
+}

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

@@ -6,6 +6,8 @@ import androidx.lifecycle.viewModelScope
 import kotlinx.coroutines.*
 import org.koitharu.kotatsu.BuildConfig
 import org.koitharu.kotatsu.utils.SingleLiveEvent
+import kotlin.coroutines.CoroutineContext
+import kotlin.coroutines.EmptyCoroutineContext
 
 abstract class BaseViewModel : ViewModel() {
 
@@ -13,19 +15,21 @@ abstract class BaseViewModel : ViewModel() {
 	val isLoading = MutableLiveData(false)
 
 	protected fun launchJob(
+		context: CoroutineContext = EmptyCoroutineContext,
 		start: CoroutineStart = CoroutineStart.DEFAULT,
 		block: suspend CoroutineScope.() -> Unit
-	): Job = viewModelScope.launch(createErrorHandler(), start, block)
+	): Job = viewModelScope.launch(context + createErrorHandler(), start, block)
 
 	protected fun launchLoadingJob(
+		context: CoroutineContext = EmptyCoroutineContext,
 		start: CoroutineStart = CoroutineStart.DEFAULT,
 		block: suspend CoroutineScope.() -> Unit
-	): Job = viewModelScope.launch(createErrorHandler(), start) {
-		isLoading.value = true
+	): Job = viewModelScope.launch(context + createErrorHandler(), start) {
+		isLoading.postValue(true)
 		try {
 			block()
 		} finally {
-			isLoading.value = false
+			isLoading.postValue(false)
 		}
 	}
 
@@ -34,7 +38,7 @@ abstract class BaseViewModel : ViewModel() {
 			throwable.printStackTrace()
 		}
 		if (throwable !is CancellationException) {
-			onError.call(throwable)
+			onError.postCall(throwable)
 		}
 	}
 }

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

@@ -5,6 +5,7 @@ import androidx.recyclerview.widget.RecyclerView
 import org.koin.core.component.KoinComponent
 import org.koitharu.kotatsu.utils.ext.replaceWith
 
+@Deprecated("", replaceWith = ReplaceWith("AsyncListDifferDelegationAdapter"))
 abstract class BaseRecyclerAdapter<T, E>(private val onItemClickListener: OnRecyclerItemClickListener<T>? = null) :
 	RecyclerView.Adapter<BaseViewHolder<T, E>>(),
 	KoinComponent {

app/src/main/java/org/koitharu/kotatsu/details/DetailsModule.kt

@@ -2,10 +2,13 @@ package org.koitharu.kotatsu.details
 
 import org.koin.android.viewmodel.dsl.viewModel
 import org.koin.dsl.module
+import org.koitharu.kotatsu.base.domain.MangaIntent
 import org.koitharu.kotatsu.details.ui.DetailsViewModel
 
 val detailsModule
 	get() = module {
 
-		viewModel { DetailsViewModel(get(), get(), get(), get(), get()) }
+		viewModel { (intent: MangaIntent) ->
+			DetailsViewModel(intent, get(), get(), get(), get(), get())
+		}
 	}

app/src/main/java/org/koitharu/kotatsu/details/ui/ChaptersAdapter.kt

@@ -1,93 +0,0 @@
-package org.koitharu.kotatsu.details.ui
-
-import android.view.ViewGroup
-import androidx.recyclerview.widget.RecyclerView
-import org.koitharu.kotatsu.base.ui.list.BaseRecyclerAdapter
-import org.koitharu.kotatsu.base.ui.list.OnRecyclerItemClickListener
-import org.koitharu.kotatsu.core.model.MangaChapter
-import org.koitharu.kotatsu.history.domain.ChapterExtra
-
-class ChaptersAdapter(onItemClickListener: OnRecyclerItemClickListener<MangaChapter>) :
-	BaseRecyclerAdapter<MangaChapter, ChapterExtra>(onItemClickListener) {
-
-	private val checkedIds = HashSet<Long>()
-
-	val checkedItemsCount: Int
-		get() = checkedIds.size
-
-	val checkedItemsIds: Set<Long>
-		get() = checkedIds
-
-	var currentChapterId: Long? = null
-		set(value) {
-			field = value
-			updateCurrentPosition()
-		}
-
-	var newChaptersCount: Int = 0
-		set(value) {
-			val updated = maxOf(field, value)
-			field = value
-			notifyItemRangeChanged(itemCount - updated, updated)
-		}
-
-	var currentChapterPosition = RecyclerView.NO_POSITION
-		private set
-
-	fun clearChecked() {
-		checkedIds.clear()
-		notifyDataSetChanged()
-	}
-
-	fun checkAll() {
-		for (item in dataSet) {
-			checkedIds.add(item.id)
-		}
-		notifyDataSetChanged()
-	}
-
-	fun setItemIsChecked(itemId: Long, isChecked: Boolean) {
-		if ((isChecked && checkedIds.add(itemId)) || (!isChecked && checkedIds.remove(itemId))) {
-			val pos = findItemPositionById(itemId)
-			if (pos != RecyclerView.NO_POSITION) {
-				notifyItemChanged(pos)
-			}
-		}
-	}
-
-	fun toggleItemChecked(itemId: Long) {
-		setItemIsChecked(itemId, itemId !in checkedIds)
-	}
-
-	override fun onCreateViewHolder(parent: ViewGroup) = ChapterHolder(parent)
-
-	override fun onGetItemId(item: MangaChapter) = item.id
-
-	override fun getExtra(item: MangaChapter, position: Int): ChapterExtra = when {
-		item.id in checkedIds -> ChapterExtra.CHECKED
-		currentChapterPosition == RecyclerView.NO_POSITION
-				|| currentChapterPosition < position -> if (position >= itemCount - newChaptersCount) {
-			ChapterExtra.NEW
-		} else {
-			ChapterExtra.UNREAD
-		}
-		currentChapterPosition == position -> ChapterExtra.CURRENT
-		currentChapterPosition > position -> ChapterExtra.READ
-		else -> ChapterExtra.UNREAD
-	}
-
-	override fun onDataSetChanged() {
-		super.onDataSetChanged()
-		updateCurrentPosition()
-	}
-
-	private fun updateCurrentPosition() {
-		val pos = currentChapterId?.let {
-			dataSet.indexOfFirst { x -> x.id == it }
-		} ?: RecyclerView.NO_POSITION
-		if (pos != currentChapterPosition) {
-			currentChapterPosition = pos
-			notifyDataSetChanged()
-		}
-	}
-}

app/src/main/java/org/koitharu/kotatsu/details/ui/ChaptersFragment.kt

@@ -9,75 +9,66 @@ import androidx.appcompat.app.AppCompatActivity
 import androidx.appcompat.view.ActionMode
 import androidx.core.view.isVisible
 import androidx.recyclerview.widget.DividerItemDecoration
-import androidx.recyclerview.widget.LinearLayoutManager
 import androidx.recyclerview.widget.RecyclerView
 import kotlinx.android.synthetic.main.fragment_chapters.*
 import org.koin.android.viewmodel.ext.android.sharedViewModel
 import org.koitharu.kotatsu.R
 import org.koitharu.kotatsu.base.ui.BaseFragment
-import org.koitharu.kotatsu.base.ui.list.OnRecyclerItemClickListener
-import org.koitharu.kotatsu.core.model.Manga
+import org.koitharu.kotatsu.base.ui.list.OnListItemClickListener
 import org.koitharu.kotatsu.core.model.MangaChapter
-import org.koitharu.kotatsu.core.model.MangaHistory
 import org.koitharu.kotatsu.core.model.MangaSource
+import org.koitharu.kotatsu.details.ui.adapter.ChaptersAdapter
+import org.koitharu.kotatsu.details.ui.adapter.ChaptersSelectionDecoration
+import org.koitharu.kotatsu.details.ui.model.ChapterListItem
 import org.koitharu.kotatsu.download.DownloadService
 import org.koitharu.kotatsu.reader.ui.ReaderActivity
-import org.koitharu.kotatsu.utils.ext.resolveDp
 
 class ChaptersFragment : BaseFragment(R.layout.fragment_chapters),
-	OnRecyclerItemClickListener<MangaChapter>, ActionMode.Callback {
+	OnListItemClickListener<MangaChapter>, ActionMode.Callback {
 
 	private val viewModel by sharedViewModel<DetailsViewModel>()
 
-	private var manga: Manga? = null
-
-	private lateinit var adapter: ChaptersAdapter
+	private var chaptersAdapter: ChaptersAdapter? = null
 	private var actionMode: ActionMode? = null
+	private var selectionDecoration: ChaptersSelectionDecoration? = null
 
 	override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
 		super.onViewCreated(view, savedInstanceState)
-		adapter = ChaptersAdapter(this)
-		recyclerView_chapters.addItemDecoration(
-			DividerItemDecoration(
-				view.context,
-				RecyclerView.VERTICAL
-			)
-		)
-		recyclerView_chapters.setHasFixedSize(true)
-		recyclerView_chapters.adapter = adapter
+		chaptersAdapter = ChaptersAdapter(this)
+		selectionDecoration = ChaptersSelectionDecoration(view.context)
+		with(recyclerView_chapters) {
+			addItemDecoration(DividerItemDecoration(view.context, RecyclerView.VERTICAL))
+			addItemDecoration(selectionDecoration!!)
+			setHasFixedSize(true)
+			adapter = chaptersAdapter
+		}
 
-		viewModel.mangaData.observe(viewLifecycleOwner, this::onMangaUpdated)
 		viewModel.isLoading.observe(viewLifecycleOwner, this::onLoadingStateChanged)
-		viewModel.history.observe(viewLifecycleOwner, this::onHistoryChanged)
-		viewModel.newChapters.observe(viewLifecycleOwner, this::onNewChaptersChanged)
+		viewModel.chapters.observe(viewLifecycleOwner, this::onChaptersChanged)
 	}
 
-	private fun onMangaUpdated(manga: Manga) {
-		this.manga = manga
-		adapter.replaceData(manga.chapters.orEmpty())
-		scrollToCurrent()
+	override fun onDestroyView() {
+		chaptersAdapter = null
+		selectionDecoration = null
+		super.onDestroyView()
 	}
 
-	private fun onLoadingStateChanged(isLoading: Boolean) {
-		progressBar.isVisible = isLoading
+	private fun onChaptersChanged(list: List<ChapterListItem>) {
+		chaptersAdapter?.items = list
 	}
 
-	private fun onHistoryChanged(history: MangaHistory?) {
-		adapter.currentChapterId = history?.chapterId
-		scrollToCurrent()
-	}
-
-	private fun onNewChaptersChanged(newChapters: Int) {
-		adapter.newChaptersCount = newChapters
+	private fun onLoadingStateChanged(isLoading: Boolean) {
+		progressBar.isVisible = isLoading
 	}
 
-	override fun onItemClick(item: MangaChapter, position: Int, view: View) {
-		if (adapter.checkedItemsCount != 0) {
-			adapter.toggleItemChecked(item.id)
-			if (adapter.checkedItemsCount == 0) {
+	override fun onItemClick(item: MangaChapter, view: View) {
+		if (selectionDecoration?.checkedItemsCount != 0) {
+			selectionDecoration?.toggleItemChecked(item.id)
+			if (selectionDecoration?.checkedItemsCount == 0) {
 				actionMode?.finish()
 			} else {
 				actionMode?.invalidate()
+				recyclerView_chapters.invalidateItemDecorations()
 			}
 			return
 		}
@@ -91,44 +82,38 @@ class ChaptersFragment : BaseFragment(R.layout.fragment_chapters),
 		startActivity(
 			ReaderActivity.newIntent(
 				context ?: return,
-				manga ?: return,
+				viewModel.manga.value ?: return,
 				item.id
 			), options.toBundle()
 		)
 	}
 
-	override fun onItemLongClick(item: MangaChapter, position: Int, view: View): Boolean {
+	override fun onItemLongClick(item: MangaChapter, view: View): Boolean {
 		if (actionMode == null) {
 			actionMode = (activity as? AppCompatActivity)?.startSupportActionMode(this)
 		}
 		return actionMode?.also {
-			adapter.setItemIsChecked(item.id, true)
+			selectionDecoration?.setItemIsChecked(item.id, true)
+			recyclerView_chapters.invalidateItemDecorations()
 			it.invalidate()
 		} != null
 	}
 
-	private fun scrollToCurrent() {
-		val pos = (recyclerView_chapters.adapter as? ChaptersAdapter)?.currentChapterPosition
-			?: RecyclerView.NO_POSITION
-		if (pos != RecyclerView.NO_POSITION) {
-			(recyclerView_chapters.layoutManager as? LinearLayoutManager)
-				?.scrollToPositionWithOffset(pos, resources.resolveDp(40))
-		}
-	}
-
 	override fun onActionItemClicked(mode: ActionMode, item: MenuItem): Boolean {
 		return when (item.itemId) {
 			R.id.action_save -> {
 				DownloadService.start(
 					context ?: return false,
-					manga ?: return false,
-					adapter.checkedItemsIds
+					viewModel.manga.value ?: return false,
+					selectionDecoration?.checkedItemsIds
 				)
 				mode.finish()
 				true
 			}
 			R.id.action_select_all -> {
-				adapter.checkAll()
+				val ids = chaptersAdapter?.items?.map { it.chapter.id } ?: return false
+				selectionDecoration?.checkAll(ids)
+				recyclerView_chapters.invalidateItemDecorations()
 				mode.invalidate()
 				true
 			}
@@ -137,6 +122,7 @@ class ChaptersFragment : BaseFragment(R.layout.fragment_chapters),
 	}
 
 	override fun onCreateActionMode(mode: ActionMode, menu: Menu): Boolean {
+		val manga = viewModel.manga.value
 		mode.menuInflater.inflate(R.menu.mode_chapters, menu)
 		menu.findItem(R.id.action_save).isVisible = manga?.source != MangaSource.LOCAL
 		mode.title = manga?.title
@@ -144,18 +130,19 @@ class ChaptersFragment : BaseFragment(R.layout.fragment_chapters),
 	}
 
 	override fun onPrepareActionMode(mode: ActionMode, menu: Menu): Boolean {
-		val count = adapter.checkedItemsCount
+		val count = selectionDecoration?.checkedItemsCount ?: return false
 		mode.subtitle = resources.getQuantityString(
 			R.plurals.chapters_from_x,
 			count,
 			count,
-			adapter.itemCount
+			chaptersAdapter?.itemCount ?: 0
 		)
 		return true
 	}
 
 	override fun onDestroyActionMode(mode: ActionMode?) {
-		adapter.clearChecked()
+		selectionDecoration?.clearSelection()
+		recyclerView_chapters.invalidateItemDecorations()
 		actionMode = null
 	}
 }

app/src/main/java/org/koitharu/kotatsu/details/ui/DetailsActivity.kt

@@ -7,20 +7,22 @@ import android.os.Bundle
 import android.view.Menu
 import android.view.MenuItem
 import android.widget.Toast
+import androidx.appcompat.app.AlertDialog
 import androidx.appcompat.view.ActionMode
 import androidx.core.content.ContextCompat
 import androidx.core.content.pm.ShortcutManagerCompat
 import androidx.core.net.toFile
 import androidx.lifecycle.lifecycleScope
-import com.google.android.material.dialog.MaterialAlertDialogBuilder
 import com.google.android.material.snackbar.Snackbar
 import com.google.android.material.tabs.TabLayout
 import com.google.android.material.tabs.TabLayoutMediator
 import kotlinx.android.synthetic.main.activity_details.*
 import kotlinx.coroutines.launch
 import org.koin.android.viewmodel.ext.android.viewModel
+import org.koin.core.parameter.parametersOf
 import org.koitharu.kotatsu.BuildConfig
 import org.koitharu.kotatsu.R
+import org.koitharu.kotatsu.base.domain.MangaIntent
 import org.koitharu.kotatsu.base.ui.BaseActivity
 import org.koitharu.kotatsu.browser.BrowserActivity
 import org.koitharu.kotatsu.core.model.Manga
@@ -34,9 +36,9 @@ import org.koitharu.kotatsu.utils.ext.getThemeColor
 
 class DetailsActivity : BaseActivity(), TabLayoutMediator.TabConfigurationStrategy {
 
-	private val viewModel by viewModel<DetailsViewModel>()
-
-	private var manga: Manga? = null
+	private val viewModel by viewModel<DetailsViewModel> {
+		parametersOf(MangaIntent.from(intent))
+	}
 
 	override fun onCreate(savedInstanceState: Bundle?) {
 		super.onCreate(savedInstanceState)
@@ -44,22 +46,14 @@ class DetailsActivity : BaseActivity(), TabLayoutMediator.TabConfigurationStrate
 		supportActionBar?.setDisplayHomeAsUpEnabled(true)
 		pager.adapter = MangaDetailsAdapter(this)
 		TabLayoutMediator(tabs, pager, this).attach()
-		if (savedInstanceState == null) {
-			intent?.getParcelableExtra<Manga>(EXTRA_MANGA)?.let {
-				viewModel.loadDetails(it, true)
-			} ?: intent?.getLongExtra(EXTRA_MANGA_ID, 0)?.takeUnless { it == 0L }?.let {
-				viewModel.findMangaById(it)
-			} ?: finishAfterTransition()
-		}
 
-		viewModel.mangaData.observe(this, ::onMangaUpdated)
+		viewModel.manga.observe(this, ::onMangaUpdated)
+		viewModel.newChaptersCount.observe(this, ::onNewChaptersChanged)
 		viewModel.onMangaRemoved.observe(this, ::onMangaRemoved)
 		viewModel.onError.observe(this, ::onError)
-		viewModel.newChapters.observe(this, ::onNewChaptersChanged)
 	}
 
 	private fun onMangaUpdated(manga: Manga) {
-		this.manga = manga
 		title = manga.title
 		invalidateOptionsMenu()
 	}
@@ -73,7 +67,7 @@ class DetailsActivity : BaseActivity(), TabLayoutMediator.TabConfigurationStrate
 	}
 
 	private fun onError(e: Throwable) {
-		if (manga == null) {
+		if (viewModel.manga.value == null) {
 			Toast.makeText(this, e.getDisplayMessage(resources), Toast.LENGTH_LONG).show()
 			finishAfterTransition()
 		} else {
@@ -98,8 +92,9 @@ class DetailsActivity : BaseActivity(), TabLayoutMediator.TabConfigurationStrate
 	}
 
 	override fun onPrepareOptionsMenu(menu: Menu): Boolean {
+		val manga = viewModel.manga.value
 		menu.findItem(R.id.action_save).isVisible =
-			manga?.source != null && manga?.source != MangaSource.LOCAL
+			manga?.source != null && manga.source != MangaSource.LOCAL
 		menu.findItem(R.id.action_delete).isVisible =
 			manga?.source == MangaSource.LOCAL
 		menu.findItem(R.id.action_browser).isVisible =
@@ -111,7 +106,7 @@ class DetailsActivity : BaseActivity(), TabLayoutMediator.TabConfigurationStrate
 
 	override fun onOptionsItemSelected(item: MenuItem) = when (item.itemId) {
 		R.id.action_share -> {
-			manga?.let {
+			viewModel.manga.value?.let {
 				if (it.source == MangaSource.LOCAL) {
 					ShareHelper.shareCbz(this, Uri.parse(it.url).toFile())
 				} else {
@@ -121,8 +116,8 @@ class DetailsActivity : BaseActivity(), TabLayoutMediator.TabConfigurationStrate
 			true
 		}
 		R.id.action_delete -> {
-			manga?.let { m ->
-				MaterialAlertDialogBuilder(this)
+			viewModel.manga.value?.let { m ->
+				AlertDialog.Builder(this)
 					.setTitle(R.string.delete_manga)
 					.setMessage(getString(R.string.text_delete_local_manga, m.title))
 					.setPositiveButton(R.string.delete) { _, _ ->
@@ -134,10 +129,10 @@ class DetailsActivity : BaseActivity(), TabLayoutMediator.TabConfigurationStrate
 			true
 		}
 		R.id.action_save -> {
-			manga?.let {
+			viewModel.manga.value?.let {
 				val chaptersCount = it.chapters?.size ?: 0
 				if (chaptersCount > 5) {
-					MaterialAlertDialogBuilder(this)
+					AlertDialog.Builder(this)
 						.setTitle(R.string.save_manga)
 						.setMessage(
 							getString(
@@ -160,19 +155,19 @@ class DetailsActivity : BaseActivity(), TabLayoutMediator.TabConfigurationStrate
 			true
 		}
 		R.id.action_browser -> {
-			manga?.let {
+			viewModel.manga.value?.let {
 				startActivity(BrowserActivity.newIntent(this, it.url))
 			}
 			true
 		}
 		R.id.action_related -> {
-			manga?.let {
+			viewModel.manga.value?.let {
 				startActivity(GlobalSearchActivity.newIntent(this, it.title))
 			}
 			true
 		}
 		R.id.action_shortcut -> {
-			manga?.let {
+			viewModel.manga.value?.let {
 				lifecycleScope.launch {
 					if (!MangaShortcut(it).requestPinShortcut(this@DetailsActivity)) {
 						Snackbar.make(
@@ -192,7 +187,6 @@ class DetailsActivity : BaseActivity(), TabLayoutMediator.TabConfigurationStrate
 		tab.text = when (position) {
 			0 -> getString(R.string.details)
 			1 -> getString(R.string.chapters)
-			2 -> getString(R.string.related)
 			else -> null
 		}
 	}
@@ -211,17 +205,14 @@ class DetailsActivity : BaseActivity(), TabLayoutMediator.TabConfigurationStrate
 
 	companion object {
 
-		private const val EXTRA_MANGA = "manga"
-		const val EXTRA_MANGA_ID = "manga_id"
-
 		const val ACTION_MANGA_VIEW = "${BuildConfig.APPLICATION_ID}.action.VIEW_MANGA"
 
 		fun newIntent(context: Context, manga: Manga) =
 			Intent(context, DetailsActivity::class.java)
-				.putExtra(EXTRA_MANGA, manga)
+				.putExtra(MangaIntent.KEY_MANGA, manga)
 
 		fun newIntent(context: Context, mangaId: Long) =
 			Intent(context, DetailsActivity::class.java)
-				.putExtra(EXTRA_MANGA_ID, mangaId)
+				.putExtra(MangaIntent.KEY_ID, mangaId)
 	}
 }

app/src/main/java/org/koitharu/kotatsu/details/ui/DetailsFragment.kt

@@ -29,23 +29,19 @@ class DetailsFragment : BaseFragment(R.layout.fragment_details), View.OnClickLis
 
 	private val viewModel by sharedViewModel<DetailsViewModel>()
 
-	private var manga: Manga? = null
-	private var history: MangaHistory? = null
-
 	override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
 		super.onViewCreated(view, savedInstanceState)
-		viewModel.mangaData.observe(viewLifecycleOwner, ::onMangaUpdated)
+		viewModel.manga.observe(viewLifecycleOwner, ::onMangaUpdated)
 		viewModel.isLoading.observe(viewLifecycleOwner, ::onLoadingStateChanged)
 		viewModel.favouriteCategories.observe(viewLifecycleOwner, ::onFavouriteChanged)
-		viewModel.history.observe(viewLifecycleOwner, ::onHistoryChanged)
+		viewModel.readingHistory.observe(viewLifecycleOwner, ::onHistoryChanged)
 	}
 
 	private fun onMangaUpdated(manga: Manga) {
-		this.manga = manga
 		imageView_cover.newImageRequest(manga.largeCoverUrl ?: manga.coverUrl)
 			.fallback(R.drawable.ic_placeholder)
 			.crossfade(true)
-			.lifecycle(this)
+			.lifecycle(viewLifecycleOwner)
 			.enqueueWith(coil)
 		textView_title.text = manga.title
 		textView_subtitle.textAndVisible = manga.altTitle
@@ -94,12 +90,19 @@ class DetailsFragment : BaseFragment(R.layout.fragment_details), View.OnClickLis
 		imageView_favourite.setOnClickListener(this)
 		button_read.setOnClickListener(this)
 		button_read.setOnLongClickListener(this)
-		updateReadButton()
+		button_read.isEnabled = !manga.chapters.isNullOrEmpty()
 	}
 
 	private fun onHistoryChanged(history: MangaHistory?) {
-		this.history = history
-		updateReadButton()
+		with(button_read) {
+			if (history == null) {
+				setText(R.string.read)
+				setIconResource(R.drawable.ic_read)
+			} else {
+				setText(R.string._continue)
+				setIconResource(R.drawable.ic_play)
+			}
+		}
 	}
 
 	private fun onFavouriteChanged(categories: List<FavouriteCategory>) {
@@ -117,6 +120,7 @@ class DetailsFragment : BaseFragment(R.layout.fragment_details), View.OnClickLis
 	}
 
 	override fun onClick(v: View) {
+		val manga = viewModel.manga.value
 		when {
 			v.id == R.id.imageView_favourite -> {
 				FavouriteCategoriesDialog.show(childFragmentManager, manga ?: return)
@@ -126,7 +130,7 @@ class DetailsFragment : BaseFragment(R.layout.fragment_details), View.OnClickLis
 					ReaderActivity.newIntent(
 						context ?: return,
 						manga ?: return,
-						history
+						viewModel.readingHistory.value
 					)
 				)
 			}
@@ -145,7 +149,7 @@ class DetailsFragment : BaseFragment(R.layout.fragment_details), View.OnClickLis
 	override fun onLongClick(v: View): Boolean {
 		when (v.id) {
 			R.id.button_read -> {
-				if (history == null) {
+				if (viewModel.readingHistory.value == null) {
 					return false
 				}
 				v.showPopupMenu(R.menu.popup_read) {
@@ -154,7 +158,7 @@ class DetailsFragment : BaseFragment(R.layout.fragment_details), View.OnClickLis
 							startActivity(
 								ReaderActivity.newIntent(
 									context ?: return@showPopupMenu false,
-									manga ?: return@showPopupMenu false
+									viewModel.manga.value ?: return@showPopupMenu false
 								)
 							)
 							true
@@ -167,19 +171,4 @@ class DetailsFragment : BaseFragment(R.layout.fragment_details), View.OnClickLis
 			else -> return false
 		}
 	}
-
-	private fun updateReadButton() {
-		if (manga?.chapters.isNullOrEmpty()) {
-			button_read.isEnabled = false
-		} else {
-			button_read.isEnabled = true
-			if (history == null) {
-				button_read.setText(R.string.read)
-				button_read.setIconResource(R.drawable.ic_read)
-			} else {
-				button_read.setText(R.string._continue)
-				button_read.setIconResource(R.drawable.ic_play)
-			}
-		}
-	}
 }

app/src/main/java/org/koitharu/kotatsu/details/ui/DetailsViewModel.kt

@@ -1,18 +1,18 @@
 package org.koitharu.kotatsu.details.ui
 
-import androidx.lifecycle.MutableLiveData
+import androidx.lifecycle.asLiveData
+import androidx.lifecycle.viewModelScope
 import kotlinx.coroutines.Dispatchers
-import kotlinx.coroutines.withContext
+import kotlinx.coroutines.flow.*
 import org.koitharu.kotatsu.base.domain.MangaDataRepository
+import org.koitharu.kotatsu.base.domain.MangaIntent
 import org.koitharu.kotatsu.base.ui.BaseViewModel
 import org.koitharu.kotatsu.core.exceptions.MangaNotFoundException
-import org.koitharu.kotatsu.core.model.FavouriteCategory
 import org.koitharu.kotatsu.core.model.Manga
-import org.koitharu.kotatsu.core.model.MangaHistory
+import org.koitharu.kotatsu.details.ui.model.toListItem
 import org.koitharu.kotatsu.favourites.domain.FavouritesRepository
-import org.koitharu.kotatsu.favourites.domain.OnFavouritesChangeListener
+import org.koitharu.kotatsu.history.domain.ChapterExtra
 import org.koitharu.kotatsu.history.domain.HistoryRepository
-import org.koitharu.kotatsu.history.domain.OnHistoryChangeListener
 import org.koitharu.kotatsu.local.domain.LocalMangaRepository
 import org.koitharu.kotatsu.tracker.domain.TrackingRepository
 import org.koitharu.kotatsu.utils.SingleLiveEvent
@@ -20,88 +20,82 @@ import org.koitharu.kotatsu.utils.ext.safe
 import java.io.IOException
 
 class DetailsViewModel(
+	intent: MangaIntent,
 	private val historyRepository: HistoryRepository,
 	private val favouritesRepository: FavouritesRepository,
 	private val localMangaRepository: LocalMangaRepository,
 	private val trackingRepository: TrackingRepository,
 	private val mangaDataRepository: MangaDataRepository
-) : BaseViewModel(), OnHistoryChangeListener, OnFavouritesChangeListener {
+) : BaseViewModel() {
+
+	private val mangaData = MutableStateFlow<Manga?>(intent.manga)
+
+	private val history = mangaData.mapNotNull { it?.id }
+		.distinctUntilChanged()
+		.flatMapLatest { mangaId ->
+			historyRepository.observeOne(mangaId)
+		}.stateIn(viewModelScope, SharingStarted.Eagerly, null)
+
+	private val favourite = mangaData.mapNotNull { it?.id }
+		.distinctUntilChanged()
+		.flatMapLatest { mangaId ->
+			favouritesRepository.observeCategories(mangaId)
+		}.stateIn(viewModelScope, SharingStarted.Eagerly, emptyList())
+
+	private val newChapters = mangaData.mapNotNull { it?.id }
+		.distinctUntilChanged()
+		.mapLatest { mangaId ->
+			trackingRepository.getNewChaptersCount(mangaId)
+		}.stateIn(viewModelScope, SharingStarted.Eagerly, 0)
+
+	val manga = mangaData.filterNotNull()
+		.asLiveData(viewModelScope.coroutineContext + Dispatchers.Default)
+	val favouriteCategories = favourite
+		.asLiveData(viewModelScope.coroutineContext + Dispatchers.Default)
+	val newChaptersCount = newChapters
+		.asLiveData(viewModelScope.coroutineContext + Dispatchers.Default)
+	val readingHistory = history
+		.asLiveData(viewModelScope.coroutineContext + Dispatchers.Default)
 
-	val mangaData = MutableLiveData<Manga>()
-	val newChapters = MutableLiveData<Int>(0)
 	val onMangaRemoved = SingleLiveEvent<Manga>()
-	val history = MutableLiveData<MangaHistory?>()
-	val favouriteCategories = MutableLiveData<List<FavouriteCategory>>()
 
-	init {
-		HistoryRepository.subscribe(this)
-		FavouritesRepository.subscribe(this)
-	}
+	val chapters = combine(
+		mangaData.map { it?.chapters.orEmpty() },
+		history.map { it?.chapterId },
+		newChapters
+	) { chapters, currentId, newCount ->
+		val currentIndex = chapters.indexOfFirst { it.id == currentId }
+		val firstNewIndex = chapters.size - newCount
+		chapters.mapIndexed { index, chapter ->
+			chapter.toListItem(
+				when {
+					index >= firstNewIndex -> ChapterExtra.NEW
+					index == currentIndex -> ChapterExtra.CURRENT
+					index < currentIndex -> ChapterExtra.READ
+					else -> ChapterExtra.UNREAD
+				}
+			)
+		}
+	}.asLiveData(viewModelScope.coroutineContext + Dispatchers.Default)
 
-	fun findMangaById(id: Long) {
-		launchLoadingJob {
-			val manga = mangaDataRepository.findMangaById(id)
-				?: throw MangaNotFoundException("Cannot find manga by id")
+	init {
+		launchLoadingJob(Dispatchers.Default) {
+			var manga = mangaDataRepository.resolveIntent(intent)
+				?: throw MangaNotFoundException("Cannot find manga")
 			mangaData.value = manga
-			loadDetails(manga, true)
-		}
-	}
-
-	fun loadDetails(manga: Manga, force: Boolean = false) {
-		if (!force && mangaData.value == manga) {
-			return
-		}
-		loadHistory(manga)
+			manga = manga.source.repository.getDetails(manga)
 			mangaData.value = manga
-		loadFavourite(manga)
-		launchLoadingJob {
-			val data = withContext(Dispatchers.Default) {
-				manga.source.repository.getDetails(manga)
-			}
-			mangaData.value = data
-			newChapters.value = trackingRepository.getNewChaptersCount(manga.id)
 		}
 	}
 
 	fun deleteLocal(manga: Manga) {
-		launchLoadingJob {
-			withContext(Dispatchers.Default) {
+		launchLoadingJob(Dispatchers.Default) {
 			val original = localMangaRepository.getRemoteManga(manga)
 			localMangaRepository.delete(manga) || throw IOException("Unable to delete file")
 			safe {
 				historyRepository.deleteOrSwap(manga, original)
 			}
+			onMangaRemoved.postCall(manga)
 		}
-			onMangaRemoved.call(manga)
-		}
-	}
-
-	private fun loadHistory(manga: Manga) {
-		launchJob {
-			history.value = historyRepository.getOne(manga)
-		}
-	}
-
-	private fun loadFavourite(manga: Manga) {
-		launchJob {
-			favouriteCategories.value = favouritesRepository.getCategories(manga.id)
-		}
-	}
-
-	override fun onHistoryChanged() {
-		loadHistory(mangaData.value ?: return)
-	}
-
-	override fun onFavouritesChanged(mangaId: Long) {
-		val manga = mangaData.value ?: return
-		if (mangaId == manga.id) {
-			loadFavourite(manga)
-		}
-	}
-
-	override fun onCleared() {
-		HistoryRepository.unsubscribe(this)
-		FavouritesRepository.unsubscribe(this)
-		super.onCleared()
 	}
 }

app/src/main/java/org/koitharu/kotatsu/details/ui/adapter/ChapterListItemAD.kt

@@ -1,23 +1,29 @@
-package org.koitharu.kotatsu.details.ui
+package org.koitharu.kotatsu.details.ui.adapter
 
-import android.graphics.Color
-import android.view.ViewGroup
-import androidx.core.view.isVisible
+import com.hannesdorfmann.adapterdelegates4.dsl.adapterDelegateLayoutContainer
 import kotlinx.android.synthetic.main.item_chapter.*
 import org.koitharu.kotatsu.R
-import org.koitharu.kotatsu.base.ui.list.BaseViewHolder
+import org.koitharu.kotatsu.base.ui.list.OnListItemClickListener
 import org.koitharu.kotatsu.core.model.MangaChapter
+import org.koitharu.kotatsu.details.ui.model.ChapterListItem
 import org.koitharu.kotatsu.history.domain.ChapterExtra
 import org.koitharu.kotatsu.utils.ext.getThemeColor
 
-class ChapterHolder(parent: ViewGroup) :
-	BaseViewHolder<MangaChapter, ChapterExtra>(parent, R.layout.item_chapter) {
+fun chapterListItemAD(
+	clickListener: OnListItemClickListener<MangaChapter>
+) = adapterDelegateLayoutContainer<ChapterListItem, ChapterListItem>(R.layout.item_chapter) {
 
-	override fun onBind(data: MangaChapter, extra: ChapterExtra) {
-		textView_title.text = data.name
-		textView_number.text = data.number.toString()
-		imageView_check.isVisible = extra == ChapterExtra.CHECKED
-		when (extra) {
+	itemView.setOnClickListener {
+		clickListener.onItemClick(item.chapter, it)
+	}
+	itemView.setOnLongClickListener {
+		clickListener.onItemLongClick(item.chapter, it)
+	}
+
+	bind { payload ->
+		textView_title.text = item.chapter.name
+		textView_number.text = item.chapter.number.toString()
+		when (item.extra) {
 			ChapterExtra.UNREAD -> {
 				textView_number.setBackgroundResource(R.drawable.bg_badge_default)
 				textView_number.setTextColor(context.getThemeColor(android.R.attr.textColorSecondaryInverse))
@@ -34,10 +40,6 @@ class ChapterHolder(parent: ViewGroup) :
 				textView_number.setBackgroundResource(R.drawable.bg_badge_accent)
 				textView_number.setTextColor(context.getThemeColor(android.R.attr.textColorPrimaryInverse))
 			}
-			ChapterExtra.CHECKED -> {
-				textView_number.background = null
-				textView_number.setTextColor(Color.TRANSPARENT)
-			}
 		}
 	}
 }

app/src/main/java/org/koitharu/kotatsu/details/ui/adapter/ChaptersAdapter.kt

@@ -0,0 +1,40 @@
+package org.koitharu.kotatsu.details.ui.adapter
+
+import androidx.recyclerview.widget.DiffUtil
+import com.hannesdorfmann.adapterdelegates4.AsyncListDifferDelegationAdapter
+import org.koitharu.kotatsu.base.ui.list.OnListItemClickListener
+import org.koitharu.kotatsu.core.model.MangaChapter
+import org.koitharu.kotatsu.details.ui.model.ChapterListItem
+import kotlin.jvm.internal.Intrinsics
+
+class ChaptersAdapter(
+	onItemClickListener: OnListItemClickListener<MangaChapter>
+) :	AsyncListDifferDelegationAdapter<ChapterListItem>(DiffCallback()) {
+
+	init {
+		setHasStableIds(true)
+		delegatesManager.addDelegate(chapterListItemAD(onItemClickListener))
+	}
+
+	override fun getItemId(position: Int): Long {
+		return items[position].chapter.id
+	}
+
+	private class DiffCallback : DiffUtil.ItemCallback<ChapterListItem>() {
+
+		override fun areItemsTheSame(oldItem: ChapterListItem, newItem: ChapterListItem): Boolean {
+			return oldItem.chapter.id == newItem.chapter.id
+		}
+
+		override fun areContentsTheSame(oldItem: ChapterListItem, newItem: ChapterListItem): Boolean {
+			return Intrinsics.areEqual(oldItem, newItem)
+		}
+
+		override fun getChangePayload(oldItem: ChapterListItem, newItem: ChapterListItem): Any? {
+			if (oldItem.extra != newItem.extra) {
+				return newItem.extra
+			}
+			return null
+		}
+	}
+}

app/src/main/java/org/koitharu/kotatsu/details/ui/adapter/ChaptersSelectionDecoration.kt

@@ -0,0 +1,108 @@
+package org.koitharu.kotatsu.details.ui.adapter
+
+import android.content.Context
+import android.graphics.Canvas
+import android.graphics.Paint
+import android.graphics.Rect
+import androidx.collection.ArraySet
+import androidx.core.content.ContextCompat
+import androidx.core.view.children
+import androidx.recyclerview.widget.RecyclerView
+import org.koitharu.kotatsu.R
+import org.koitharu.kotatsu.utils.ext.getThemeColor
+import org.koitharu.kotatsu.utils.ext.resolveDp
+
+class ChaptersSelectionDecoration(context: Context) : RecyclerView.ItemDecoration() {
+
+	private val icon = ContextCompat.getDrawable(context, R.drawable.ic_check)
+	private val padding = context.resources.resolveDp(16)
+	private val bounds = Rect()
+	private val selection = ArraySet<Long>()
+	private val paint = Paint(Paint.ANTI_ALIAS_FLAG)
+
+	init {
+		paint.color = context.getThemeColor(android.R.attr.colorControlActivated)
+		paint.style = Paint.Style.FILL
+	}
+
+	val checkedItemsCount: Int
+		get() = selection.size
+
+	val checkedItemsIds: Set<Long>
+		get() = selection
+
+	fun toggleItemChecked(id: Long) {
+		if (!selection.remove(id)) {
+			selection.add(id)
+		}
+	}
+
+	fun setItemIsChecked(id: Long, isChecked: Boolean) {
+		if (isChecked) {
+			selection.add(id)
+		} else {
+			selection.remove(id)
+		}
+	}
+
+	fun checkAll(ids: Collection<Long>) {
+		selection.addAll(ids)
+	}
+
+	fun clearSelection() {
+		selection.clear()
+	}
+
+	override fun onDraw(canvas: Canvas, parent: RecyclerView, state: RecyclerView.State) {
+		icon ?: return
+		canvas.save()
+		if (parent.clipToPadding) {
+			canvas.clipRect(
+				parent.paddingLeft, parent.paddingTop, parent.width - parent.paddingRight,
+				parent.height - parent.paddingBottom
+			)
+		}
+
+		for (child in parent.children) {
+			val itemId = parent.getChildItemId(child)
+			if (itemId in selection) {
+				parent.getDecoratedBoundsWithMargins(child, bounds)
+				bounds.offset(child.translationX.toInt(), child.translationY.toInt())
+				canvas.drawRect(bounds, paint)
+			}
+		}
+		canvas.restore()
+	}
+
+	override fun onDrawOver(canvas: Canvas, parent: RecyclerView, state: RecyclerView.State) {
+		icon ?: return
+		canvas.save()
+		val left: Int
+		val right: Int
+		if (parent.clipToPadding) {
+			left = parent.paddingLeft
+			right = parent.width - parent.paddingRight
+			canvas.clipRect(
+				left, parent.paddingTop, right,
+				parent.height - parent.paddingBottom
+			)
+		} else {
+			left = 0
+			right = parent.width
+		}
+
+		for (child in parent.children) {
+			val itemId = parent.getChildItemId(child)
+			if (itemId in selection) {
+				parent.getDecoratedBoundsWithMargins(child, bounds)
+				bounds.offset(child.translationX.toInt(), child.translationY.toInt())
+				val hh = (bounds.height() - icon.intrinsicHeight) / 2
+				val top: Int = bounds.top + hh
+				val bottom: Int = bounds.bottom - hh
+				icon.setBounds(right - icon.intrinsicWidth - padding, top, right - padding, bottom)
+				icon.draw(canvas)
+			}
+		}
+		canvas.restore()
+	}
+}

app/src/main/java/org/koitharu/kotatsu/details/ui/model/ChapterListItem.kt

@@ -0,0 +1,9 @@
+package org.koitharu.kotatsu.details.ui.model
+
+import org.koitharu.kotatsu.core.model.MangaChapter
+import org.koitharu.kotatsu.history.domain.ChapterExtra
+
+data class ChapterListItem(
+	val chapter: MangaChapter,
+	val extra: ChapterExtra
+)

app/src/main/java/org/koitharu/kotatsu/details/ui/model/ListModelConversionExt.kt

@@ -0,0 +1,9 @@
+package org.koitharu.kotatsu.details.ui.model
+
+import org.koitharu.kotatsu.core.model.MangaChapter
+import org.koitharu.kotatsu.history.domain.ChapterExtra
+
+fun MangaChapter.toListItem(extra: ChapterExtra) = ChapterListItem(
+	chapter = this,
+	extra = extra
+)

app/src/main/java/org/koitharu/kotatsu/favourites/data/FavouritesDao.kt

@@ -38,6 +38,10 @@ abstract class FavouritesDao {
 	@Query("SELECT * FROM favourites WHERE manga_id = :id GROUP BY manga_id")
 	abstract suspend fun find(id: Long): FavouriteManga?
 
+	@Transaction
+	@Query("SELECT * FROM favourites WHERE manga_id = :id GROUP BY manga_id")
+	abstract fun observe(id: Long): Flow<FavouriteManga?>
+
 	@Insert(onConflict = OnConflictStrategy.IGNORE)
 	abstract suspend fun insert(favourite: FavouriteEntity)
 

app/src/main/java/org/koitharu/kotatsu/favourites/domain/FavouritesRepository.kt

@@ -4,6 +4,7 @@ import androidx.collection.ArraySet
 import androidx.room.withTransaction
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.map
 import kotlinx.coroutines.withContext
 import org.koitharu.kotatsu.core.db.MangaDatabase
 import org.koitharu.kotatsu.core.db.entity.MangaEntity
@@ -57,6 +58,12 @@ class FavouritesRepository(private val db: MangaDatabase) {
 		return entities?.map { it.toFavouriteCategory() }.orEmpty()
 	}
 
+	fun observeCategories(mangaId: Long): Flow<List<FavouriteCategory>> {
+		return db.favouritesDao.observe(mangaId).map { entity ->
+			entity?.categories?.map { it.toFavouriteCategory() }.orEmpty()
+		}
+	}
+
 	suspend fun addCategory(title: String): FavouriteCategory {
 		val entity = FavouriteCategoryEntity(
 			title = title,

app/src/main/java/org/koitharu/kotatsu/history/data/HistoryDao.kt

@@ -25,6 +25,9 @@ abstract class HistoryDao {
 	@Query("SELECT * FROM history WHERE manga_id = :id")
 	abstract suspend fun find(id: Long): HistoryEntity?
 
+	@Query("SELECT * FROM history WHERE manga_id = :id")
+	abstract fun observe(id: Long): Flow<HistoryEntity?>
+
 	@Query("DELETE FROM history")
 	abstract suspend fun clear()
 

app/src/main/java/org/koitharu/kotatsu/history/domain/ChapterExtra.kt

@@ -2,5 +2,5 @@ package org.koitharu.kotatsu.history.domain
 
 enum class ChapterExtra {
 
-	READ, CURRENT, UNREAD, NEW, CHECKED
+	READ, CURRENT, UNREAD, NEW
 }

app/src/main/java/org/koitharu/kotatsu/history/domain/HistoryRepository.kt

@@ -4,6 +4,7 @@ import androidx.collection.ArraySet
 import androidx.room.withTransaction
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.flow.Flow
+import kotlinx.coroutines.flow.map
 import kotlinx.coroutines.withContext
 import org.koin.core.component.KoinComponent
 import org.koin.core.component.inject
@@ -32,6 +33,12 @@ class HistoryRepository(private val db: MangaDatabase) : KoinComponent {
 		}
 	}
 
+	fun observeOne(id: Long): Flow<MangaHistory?> {
+		return db.historyDao.observe(id).map {
+			it?.toMangaHistory()
+		}
+	}
+
 	suspend fun addOrUpdate(manga: Manga, chapterId: Long, page: Int, scroll: Int) {
 		val tags = manga.tags.map(TagEntity.Companion::fromMangaTag)
 		db.withTransaction {

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

@@ -5,18 +5,17 @@ import android.view.View
 import androidx.appcompat.app.AlertDialog
 import androidx.fragment.app.FragmentManager
 import androidx.recyclerview.widget.DividerItemDecoration
-import androidx.recyclerview.widget.LinearLayoutManager
 import androidx.recyclerview.widget.RecyclerView
 import kotlinx.android.synthetic.main.dialog_chapters.*
 import org.koitharu.kotatsu.R
 import org.koitharu.kotatsu.base.ui.AlertDialogFragment
-import org.koitharu.kotatsu.base.ui.list.OnRecyclerItemClickListener
+import org.koitharu.kotatsu.base.ui.list.OnListItemClickListener
 import org.koitharu.kotatsu.core.model.MangaChapter
-import org.koitharu.kotatsu.details.ui.ChaptersAdapter
+import org.koitharu.kotatsu.details.ui.adapter.ChaptersAdapter
 import org.koitharu.kotatsu.utils.ext.withArgs
 
 class ChaptersDialog : AlertDialogFragment(R.layout.dialog_chapters),
-	OnRecyclerItemClickListener<MangaChapter> {
+	OnListItemClickListener<MangaChapter> {
 
 	override fun onBuildDialog(builder: AlertDialog.Builder) {
 		builder.setTitle(R.string.chapters)
@@ -32,22 +31,12 @@ class ChaptersDialog : AlertDialogFragment(R.layout.dialog_chapters),
 			)
 		)
 		recyclerView_chapters.adapter = ChaptersAdapter(this).apply {
-			arguments?.getParcelableArrayList<MangaChapter>(ARG_CHAPTERS)?.let(this::replaceData)
-			currentChapterId = arguments?.getLong(ARG_CURRENT_ID, 0L)?.takeUnless { it == 0L }
+			// arguments?.getParcelableArrayList<MangaChapter>(ARG_CHAPTERS)?.let(this::setItems)
+			// currentChapterId = arguments?.getLong(ARG_CURRENT_ID, 0L)?.takeUnless { it == 0L }
 		}
 	}
 
-	override fun onResume() {
-		super.onResume()
-		val pos = (recyclerView_chapters.adapter as? ChaptersAdapter)?.currentChapterPosition
-			?: RecyclerView.NO_POSITION
-		if (pos != RecyclerView.NO_POSITION) {
-			(recyclerView_chapters.layoutManager as? LinearLayoutManager)
-				?.scrollToPositionWithOffset(pos, 100)
-		}
-	}
-
-	override fun onItemClick(item: MangaChapter, position: Int, view: View) {
+	override fun onItemClick(item: MangaChapter, view: View) {
 		((parentFragment as? OnChapterChangeListener)
 			?: (activity as? OnChapterChangeListener))?.let {
 			dismiss()

app/src/main/java/org/koitharu/kotatsu/utils/SelectionController.kt

@@ -0,0 +1,10 @@
+package org.koitharu.kotatsu.utils
+
+import kotlinx.coroutines.flow.MutableStateFlow
+
+class SelectionController {
+
+	private val state = MutableStateFlow(emptySet<Int>())
+
+
+}

app/src/main/java/org/koitharu/kotatsu/widget/recent/RecentListFactory.kt

@@ -9,8 +9,8 @@ import coil.executeBlocking
 import coil.request.ImageRequest
 import kotlinx.coroutines.runBlocking
 import org.koitharu.kotatsu.R
+import org.koitharu.kotatsu.base.domain.MangaIntent
 import org.koitharu.kotatsu.core.model.Manga
-import org.koitharu.kotatsu.details.ui.DetailsActivity
 import org.koitharu.kotatsu.history.domain.HistoryRepository
 import org.koitharu.kotatsu.utils.ext.requireBitmap
 import java.io.IOException
@@ -52,7 +52,7 @@ class RecentListFactory(
 			views.setImageViewResource(R.id.imageView_cover, R.drawable.ic_placeholder)
 		}
 		val intent = Intent()
-		intent.putExtra(DetailsActivity.EXTRA_MANGA_ID, item.id)
+		intent.putExtra(MangaIntent.KEY_ID, item.id)
 		views.setOnClickFillInIntent(R.id.imageView_cover, intent)
 		return views
 	}

app/src/main/java/org/koitharu/kotatsu/widget/shelf/ShelfListFactory.kt

@@ -9,9 +9,9 @@ import coil.executeBlocking
 import coil.request.ImageRequest
 import kotlinx.coroutines.runBlocking
 import org.koitharu.kotatsu.R
+import org.koitharu.kotatsu.base.domain.MangaIntent
 import org.koitharu.kotatsu.core.model.Manga
 import org.koitharu.kotatsu.core.prefs.AppWidgetConfig
-import org.koitharu.kotatsu.details.ui.DetailsActivity
 import org.koitharu.kotatsu.favourites.domain.FavouritesRepository
 import org.koitharu.kotatsu.utils.ext.requireBitmap
 import java.io.IOException
@@ -63,7 +63,7 @@ class ShelfListFactory(
 			views.setImageViewResource(R.id.imageView_cover, R.drawable.ic_placeholder)
 		}
 		val intent = Intent()
-		intent.putExtra(DetailsActivity.EXTRA_MANGA_ID, item.id)
+		intent.putExtra(MangaIntent.KEY_ID, item.id)
 		views.setOnClickFillInIntent(R.id.rootLayout, intent)
 		return views
 	}

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

@@ -21,20 +21,6 @@
 		android:textColor="?android:textColorSecondaryInverse"
 		tools:text="13" />
 
-	<ImageView
-		android:id="@+id/imageView_check"
-		android:layout_width="0dp"
-		android:layout_height="0dp"
-		android:layout_alignParentStart="true"
-		android:layout_alignParentTop="true"
-		android:layout_alignParentBottom="true"
-		android:layout_toStartOf="@id/textView_title"
-		android:contentDescription="@null"
-		android:scaleType="centerInside"
-		android:src="@drawable/ic_check"
-		android:visibility="gone"
-		tools:visibility="visible" />
-
 	<TextView
 		android:id="@+id/textView_title"
 		android:layout_width="match_parent"