Save state of selection in lists

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

@@ -12,6 +12,7 @@ import androidx.appcompat.app.AppCompatActivity
 import androidx.appcompat.view.ActionMode
 import androidx.appcompat.widget.ActionBarContextView
 import androidx.appcompat.widget.Toolbar
+import androidx.core.app.ActivityCompat
 import androidx.core.view.ViewCompat
 import androidx.core.view.WindowCompat
 import androidx.core.view.WindowInsetsCompat
@@ -82,9 +83,8 @@ abstract class BaseActivity<B : ViewBinding> :
 
 	override fun onKeyDown(keyCode: Int, event: KeyEvent?): Boolean {
 		if (BuildConfig.DEBUG && keyCode == KeyEvent.KEYCODE_VOLUME_UP) { // TODO remove
-			// ActivityCompat.recreate(this)
+			ActivityCompat.recreate(this)
-			throw RuntimeException("Test crash")
+			return true
-			// return true
 		}
 		return super.onKeyDown(keyCode, event)
 	}

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

@@ -0,0 +1,156 @@
+package org.koitharu.kotatsu.base.ui.list
+
+import android.app.Activity
+import android.os.Bundle
+import android.view.Menu
+import android.view.MenuItem
+import androidx.appcompat.app.AppCompatActivity
+import androidx.appcompat.view.ActionMode
+import androidx.lifecycle.Lifecycle
+import androidx.lifecycle.LifecycleEventObserver
+import androidx.lifecycle.LifecycleOwner
+import androidx.recyclerview.widget.RecyclerView
+import androidx.savedstate.SavedStateRegistry
+import androidx.savedstate.SavedStateRegistryOwner
+import org.koitharu.kotatsu.base.ui.list.decor.AbstractSelectionItemDecoration
+
+private const val KEY_SELECTION = "selection"
+private const val PROVIDER_NAME = "selection_decoration"
+
+class ListSelectionController(
+	private val activity: Activity,
+	private val decoration: AbstractSelectionItemDecoration,
+	private val registryOwner: SavedStateRegistryOwner,
+	private val callback: Callback,
+) : ActionMode.Callback, SavedStateRegistry.SavedStateProvider {
+
+	private var actionMode: ActionMode? = null
+	private val stateEventObserver = StateEventObserver()
+
+	val count: Int
+		get() = decoration.checkedItemsCount
+
+	fun snapshot(): Set<Long> {
+		return peekCheckedIds().toSet()
+	}
+
+	fun peekCheckedIds(): Set<Long> {
+		return decoration.checkedItemsIds
+	}
+
+	fun clear() {
+		decoration.clearSelection()
+		notifySelectionChanged()
+	}
+
+	fun addAll(ids: Collection<Long>) {
+		if (ids.isEmpty()) {
+			return
+		}
+		decoration.checkAll(ids)
+		notifySelectionChanged()
+	}
+
+	fun attachToRecyclerView(recyclerView: RecyclerView) {
+		recyclerView.addItemDecoration(decoration)
+		registryOwner.lifecycle.addObserver(stateEventObserver)
+	}
+
+	override fun saveState(): Bundle {
+		val bundle = Bundle(1)
+		bundle.putLongArray(KEY_SELECTION, peekCheckedIds().toLongArray())
+		return bundle
+	}
+
+	fun onItemClick(id: Long): Boolean {
+		if (decoration.checkedItemsCount != 0) {
+			decoration.toggleItemChecked(id)
+			if (decoration.checkedItemsCount == 0) {
+				actionMode?.finish()
+			} else {
+				actionMode?.invalidate()
+			}
+			notifySelectionChanged()
+			return true
+		}
+		return false
+	}
+
+	fun onItemLongClick(id: Long): Boolean {
+		startActionMode()
+		return actionMode?.also {
+			decoration.setItemIsChecked(id, true)
+			notifySelectionChanged()
+		} != null
+	}
+
+	override fun onCreateActionMode(mode: ActionMode, menu: Menu): Boolean {
+		return callback.onCreateActionMode(mode, menu)
+	}
+
+	override fun onPrepareActionMode(mode: ActionMode, menu: Menu): Boolean {
+		return callback.onPrepareActionMode(mode, menu)
+	}
+
+	override fun onActionItemClicked(mode: ActionMode, item: MenuItem): Boolean {
+		return callback.onActionItemClicked(mode, item)
+	}
+
+	override fun onDestroyActionMode(mode: ActionMode) {
+		callback.onDestroyActionMode(mode)
+		clear()
+		actionMode = null
+	}
+
+	private fun startActionMode() {
+		if (actionMode == null) {
+			actionMode = (activity as? AppCompatActivity)?.startSupportActionMode(this)
+		}
+	}
+
+	private fun notifySelectionChanged() {
+		val count = decoration.checkedItemsCount
+		callback.onSelectionChanged(count)
+		if (count == 0) {
+			actionMode?.finish()
+		} else {
+			actionMode?.invalidate()
+		}
+	}
+
+	private fun restoreState(ids: Collection<Long>) {
+		if (ids.isEmpty() || decoration.checkedItemsCount != 0) {
+			return
+		}
+		decoration.checkAll(ids)
+		startActionMode()
+		notifySelectionChanged()
+	}
+
+	interface Callback : ActionMode.Callback {
+
+		fun onSelectionChanged(count: Int)
+
+		override fun onCreateActionMode(mode: ActionMode, menu: Menu): Boolean
+
+		override fun onPrepareActionMode(mode: ActionMode, menu: Menu): Boolean
+
+		override fun onActionItemClicked(mode: ActionMode, item: MenuItem): Boolean
+
+		override fun onDestroyActionMode(mode: ActionMode) = Unit
+	}
+
+	private inner class StateEventObserver : LifecycleEventObserver {
+
+		override fun onStateChanged(source: LifecycleOwner, event: Lifecycle.Event) {
+			if (event == Lifecycle.Event.ON_CREATE) {
+				val registry = registryOwner.savedStateRegistry
+				registry.registerSavedStateProvider(PROVIDER_NAME, this@ListSelectionController)
+				val state = registry.consumeRestoredStateForKey(PROVIDER_NAME)
+				if (state != null) {
+					restoreState(state.getLongArray(KEY_SELECTION)?.toList().orEmpty())
+				}
+			}
+		}
+	}
+}

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

@@ -5,7 +5,6 @@ import android.os.Bundle
 import android.view.*
 import android.widget.AdapterView
 import android.widget.Spinner
-import androidx.appcompat.app.AppCompatActivity
 import androidx.appcompat.view.ActionMode
 import androidx.appcompat.widget.SearchView
 import androidx.core.graphics.Insets
@@ -16,6 +15,7 @@ import com.google.android.material.snackbar.Snackbar
 import org.koin.androidx.viewmodel.ext.android.sharedViewModel
 import org.koitharu.kotatsu.R
 import org.koitharu.kotatsu.base.ui.BaseFragment
+import org.koitharu.kotatsu.base.ui.list.ListSelectionController
 import org.koitharu.kotatsu.base.ui.list.OnListItemClickListener
 import org.koitharu.kotatsu.databinding.FragmentChaptersBinding
 import org.koitharu.kotatsu.details.ui.adapter.BranchesAdapter
@@ -34,16 +34,15 @@ import kotlin.math.roundToInt
 class ChaptersFragment :
 	BaseFragment<FragmentChaptersBinding>(),
 	OnListItemClickListener<ChapterListItem>,
-	ActionMode.Callback,
 	AdapterView.OnItemSelectedListener,
 	MenuItem.OnActionExpandListener,
-	SearchView.OnQueryTextListener {
+	SearchView.OnQueryTextListener,
+	ListSelectionController.Callback {
 
 	private val viewModel by sharedViewModel<DetailsViewModel>()
 
 	private var chaptersAdapter: ChaptersAdapter? = null
-	private var actionMode: ActionMode? = null
+	private var selectionController: ListSelectionController? = null
-	private var selectionDecoration: ChaptersSelectionDecoration? = null
 
 	override fun onInflateView(
 		inflater: LayoutInflater,
@@ -53,9 +52,14 @@ class ChaptersFragment :
 	override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
 		super.onViewCreated(view, savedInstanceState)
 		chaptersAdapter = ChaptersAdapter(this)
-		selectionDecoration = ChaptersSelectionDecoration(view.context)
+		selectionController = ListSelectionController(
+			activity = requireActivity(),
+			decoration = ChaptersSelectionDecoration(view.context),
+			registryOwner = this,
+			callback = this,
+		)
 		with(binding.recyclerViewChapters) {
-			addItemDecoration(selectionDecoration!!)
+			checkNotNull(selectionController).attachToRecyclerView(this)
 			setHasFixedSize(true)
 			adapter = chaptersAdapter
 		}
@@ -74,20 +78,13 @@ class ChaptersFragment :
 
 	override fun onDestroyView() {
 		chaptersAdapter = null
-		selectionDecoration = null
+		selectionController = null
 		binding.spinnerBranches?.adapter = null
 		super.onDestroyView()
 	}
 
 	override fun onItemClick(item: ChapterListItem, view: View) {
-		if (selectionDecoration?.checkedItemsCount != 0) {
+		if (selectionController?.onItemClick(item.chapter.id) == true) {
-			selectionDecoration?.toggleItemChecked(item.chapter.id)
-			if (selectionDecoration?.checkedItemsCount == 0) {
-				actionMode?.finish()
-			} else {
-				actionMode?.invalidate()
-				binding.recyclerViewChapters.invalidateItemDecorations()
-			}
 			return
 		}
 		if (item.hasFlag(ChapterListItem.FLAG_MISSING)) {
@@ -106,14 +103,7 @@ class ChaptersFragment :
 	}
 
 	override fun onItemLongClick(item: ChapterListItem, view: View): Boolean {
-		if (actionMode == null) {
+		return selectionController?.onItemLongClick(item.chapter.id) ?: false
-			actionMode = (activity as? AppCompatActivity)?.startSupportActionMode(this)
-		}
-		return actionMode?.also {
-			selectionDecoration?.setItemIsChecked(item.chapter.id, true)
-			binding.recyclerViewChapters.invalidateItemDecorations()
-			it.invalidate()
-		} != null
 	}
 
 	override fun onActionItemClicked(mode: ActionMode, item: MenuItem): Boolean {
@@ -122,13 +112,13 @@ class ChaptersFragment :
 				DownloadService.start(
 					context ?: return false,
 					viewModel.getRemoteManga() ?: viewModel.manga.value ?: return false,
-					selectionDecoration?.checkedItemsIds?.toSet()
+					selectionController?.snapshot(),
 				)
 				mode.finish()
 				true
 			}
 			R.id.action_delete -> {
-				val ids = selectionDecoration?.checkedItemsIds
+				val ids = selectionController?.peekCheckedIds()
 				val manga = viewModel.manga.value
 				when {
 					ids.isNullOrEmpty() || manga == null -> Unit
@@ -147,9 +137,7 @@ class ChaptersFragment :
 			}
 			R.id.action_select_all -> {
 				val ids = chaptersAdapter?.items?.map { it.chapter.id } ?: return false
-				selectionDecoration?.checkAll(ids)
+				selectionController?.addAll(ids)
-				binding.recyclerViewChapters.invalidateItemDecorations()
-				mode.invalidate()
 				true
 			}
 			else -> false
@@ -169,7 +157,7 @@ class ChaptersFragment :
 	}
 
 	override fun onPrepareActionMode(mode: ActionMode, menu: Menu): Boolean {
-		val selectedIds = selectionDecoration?.checkedItemsIds ?: return false
+		val selectedIds = selectionController?.peekCheckedIds() ?: return false
 		val items = chaptersAdapter?.items?.filter { x -> x.chapter.id in selectedIds }.orEmpty()
 		menu.findItem(R.id.action_save).isVisible = items.none { x ->
 			x.chapter.source == MangaSource.LOCAL
@@ -181,10 +169,8 @@ class ChaptersFragment :
 		return true
 	}
 
-	override fun onDestroyActionMode(mode: ActionMode?) {
+	override fun onSelectionChanged(count: Int) {
-		selectionDecoration?.clearSelection()
 		binding.recyclerViewChapters.invalidateItemDecorations()
-		actionMode = null
 	}
 
 	override fun onMenuItemActionExpand(item: MenuItem?): Boolean = true

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

@@ -3,7 +3,6 @@ package org.koitharu.kotatsu.list.ui
 import android.os.Bundle
 import android.view.*
 import androidx.annotation.CallSuper
-import androidx.appcompat.app.AppCompatActivity
 import androidx.appcompat.view.ActionMode
 import androidx.collection.ArraySet
 import androidx.core.graphics.Insets
@@ -18,6 +17,7 @@ import org.koitharu.kotatsu.R
 import org.koitharu.kotatsu.base.ui.BaseFragment
 import org.koitharu.kotatsu.base.ui.list.FitHeightGridLayoutManager
 import org.koitharu.kotatsu.base.ui.list.FitHeightLinearLayoutManager
+import org.koitharu.kotatsu.base.ui.list.ListSelectionController
 import org.koitharu.kotatsu.base.ui.list.PaginationScrollListener
 import org.koitharu.kotatsu.base.ui.list.decor.SpacingItemDecoration
 import org.koitharu.kotatsu.base.ui.list.decor.TypedSpacingItemDecoration
@@ -46,12 +46,11 @@ abstract class MangaListFragment :
 	PaginationScrollListener.Callback,
 	MangaListListener,
 	SwipeRefreshLayout.OnRefreshListener,
-	ActionMode.Callback {
+	ListSelectionController.Callback {
 
 	private var listAdapter: MangaListAdapter? = null
 	private var paginationListener: PaginationScrollListener? = null
-	private var selectionDecoration: MangaSelectionDecoration? = null
+	private var selectionController: ListSelectionController? = null
-	private var actionMode: ActionMode? = null
 	private val spanResolver = MangaListSpanResolver()
 	private val spanSizeLookup = SpanSizeLookup()
 	private val listCommitCallback = Runnable {
@@ -62,7 +61,7 @@ abstract class MangaListFragment :
 	protected abstract val viewModel: MangaListViewModel
 
 	protected val selectedItemsIds: Set<Long>
-		get() = selectionDecoration?.checkedItemsIds?.toSet().orEmpty()
+		get() = selectionController?.snapshot().orEmpty()
 
 	protected val selectedItems: Set<Manga>
 		get() = collectSelectedItems()
@@ -79,12 +78,17 @@ abstract class MangaListFragment :
 			lifecycleOwner = viewLifecycleOwner,
 			listener = this,
 		)
-		selectionDecoration = MangaSelectionDecoration(view.context)
+		selectionController = ListSelectionController(
+			activity = requireActivity(),
+			decoration = MangaSelectionDecoration(view.context),
+			registryOwner = this,
+			callback = this,
+		)
 		paginationListener = PaginationScrollListener(4, this)
 		with(binding.recyclerView) {
 			setHasFixedSize(true)
 			adapter = listAdapter
-			addItemDecoration(selectionDecoration!!)
+			checkNotNull(selectionController).attachToRecyclerView(binding.recyclerView)
 			addOnScrollListener(paginationListener!!)
 		}
 		with(binding.swipeRefreshLayout) {
@@ -105,34 +109,19 @@ abstract class MangaListFragment :
 	override fun onDestroyView() {
 		listAdapter = null
 		paginationListener = null
-		selectionDecoration = null
+		selectionController = null
 		spanSizeLookup.invalidateCache()
 		super.onDestroyView()
 	}
 
 	override fun onItemClick(item: Manga, view: View) {
-		if (selectionDecoration?.checkedItemsCount != 0) {
+		if (selectionController?.onItemClick(item.id) != true) {
-			selectionDecoration?.toggleItemChecked(item.id)
+			startActivity(DetailsActivity.newIntent(context ?: return, item))
-			if (selectionDecoration?.checkedItemsCount == 0) {
-				actionMode?.finish()
-			} else {
-				actionMode?.invalidate()
-				binding.recyclerView.invalidateItemDecorations()
-			}
-			return
 		}
-		startActivity(DetailsActivity.newIntent(context ?: return, item))
 	}
 
 	override fun onItemLongClick(item: Manga, view: View): Boolean {
-		if (actionMode == null) {
+		return selectionController?.onItemLongClick(item.id) ?: false
-			actionMode = (activity as? AppCompatActivity)?.startSupportActionMode(this)
-		}
-		return actionMode?.also {
-			selectionDecoration?.setItemIsChecked(item.id, true)
-			binding.recyclerView.invalidateItemDecorations()
-			it.invalidate()
-		} != null
 	}
 
 	@CallSuper
@@ -249,7 +238,7 @@ abstract class MangaListFragment :
 					addOnLayoutChangeListener(spanResolver)
 				}
 			}
-			selectionDecoration?.let { addItemDecoration(it) }
+			selectionController?.attachToRecyclerView(binding.recyclerView)
 		}
 	}
 
@@ -259,7 +248,7 @@ abstract class MangaListFragment :
 
 	@CallSuper
 	override fun onPrepareActionMode(mode: ActionMode, menu: Menu): Boolean {
-		mode.title = selectionDecoration?.checkedItemsCount?.toString()
+		mode.title = selectionController?.count?.toString()
 		return true
 	}
 
@@ -269,9 +258,7 @@ abstract class MangaListFragment :
 				val ids = listAdapter?.items?.mapNotNull {
 					(it as? MangaItemModel)?.id
 				} ?: return false
-				selectionDecoration?.checkAll(ids)
+				selectionController?.addAll(ids)
-				binding.recyclerView.invalidateItemDecorations()
-				mode.invalidate()
 				true
 			}
 			R.id.action_share -> {
@@ -293,14 +280,12 @@ abstract class MangaListFragment :
 		}
 	}
 
-	override fun onDestroyActionMode(mode: ActionMode) {
+	override fun onSelectionChanged(count: Int) {
-		selectionDecoration?.clearSelection()
 		binding.recyclerView.invalidateItemDecorations()
-		actionMode = null
 	}
 
 	private fun collectSelectedItems(): Set<Manga> {
-		val checkedIds = selectionDecoration?.checkedItemsIds ?: return emptySet()
+		val checkedIds = selectionController?.peekCheckedIds() ?: return emptySet()
 		val items = listAdapter?.items ?: return emptySet()
 		val result = ArraySet<Manga>(checkedIds.size)
 		for (item in items) {

app/src/main/java/org/koitharu/kotatsu/main/ui/MainActivity.kt

@@ -145,8 +145,15 @@ class MainActivity :
 
 	override fun onRestoreInstanceState(savedInstanceState: Bundle) {
 		super.onRestoreInstanceState(savedInstanceState)
-		drawerToggle?.isDrawerIndicatorEnabled =
+		val isSearchOpened = isSearchOpened()
-			drawer?.getDrawerLockMode(GravityCompat.START) == DrawerLayout.LOCK_MODE_UNLOCKED
+		adjustDrawerLock(isSearchOpened)
+		if (isSearchOpened) {
+			binding.toolbarCard.updateLayoutParams<AppBarLayout.LayoutParams> {
+				scrollFlags = SCROLL_FLAG_NO_SCROLL
+			}
+			binding.appbar.setBackgroundColor(getThemeColor(materialR.attr.colorSurfaceVariant))
+			binding.appbar.updatePadding(left = 0, right = 0)
+		}
 	}
 
 	override fun onPostCreate(savedInstanceState: Bundle?) {
@@ -396,29 +403,31 @@ class MainActivity :
 
 	private fun onSearchOpened() {
 		TransitionManager.beginDelayedTransition(binding.appbar)
-		drawerToggle?.isDrawerIndicatorEnabled = false
 		binding.toolbarCard.updateLayoutParams<AppBarLayout.LayoutParams> {
 			scrollFlags = SCROLL_FLAG_NO_SCROLL
 		}
 		binding.appbar.setBackgroundColor(getThemeColor(materialR.attr.colorSurfaceVariant))
 		binding.appbar.updatePadding(left = 0, right = 0)
-		adjustDrawerLock()
+		adjustDrawerLock(isSearchOpened = true)
 		adjustFabVisibility(isSearchOpened = true)
 	}
 
 	private fun onSearchClosed() {
 		TransitionManager.beginDelayedTransition(binding.appbar)
-		drawerToggle?.isDrawerIndicatorEnabled = true
 		binding.toolbarCard.updateLayoutParams<AppBarLayout.LayoutParams> {
 			scrollFlags = SCROLL_FLAG_SCROLL or SCROLL_FLAG_ENTER_ALWAYS
 		}
 		binding.appbar.background = null
 		val padding = resources.getDimensionPixelOffset(R.dimen.margin_normal)
 		binding.appbar.updatePadding(left = padding, right = padding)
-		adjustDrawerLock()
+		adjustDrawerLock(isSearchOpened = false)
 		adjustFabVisibility(isSearchOpened = false)
 	}
 
+	private fun isSearchOpened(): Boolean {
+		return supportFragmentManager.findFragmentByTag(TAG_SEARCH)?.isVisible == true
+	}
+
 	private fun onFirstStart() {
 		lifecycleScope.launchWhenResumed {
 			val isUpdateSupported = withContext(Dispatchers.Default) {
@@ -440,7 +449,7 @@ class MainActivity :
 	private fun adjustFabVisibility(
 		isResumeEnabled: Boolean = viewModel.isResumeEnabled.value == true,
 		topFragment: Fragment? = supportFragmentManager.findFragmentByTag(TAG_PRIMARY),
-		isSearchOpened: Boolean = supportFragmentManager.findFragmentByTag(TAG_SEARCH)?.isVisible == true,
+		isSearchOpened: Boolean = isSearchOpened(),
 	) {
 		val fab = binding.fab
 		if (isResumeEnabled && !isSearchOpened && topFragment is HistoryListFragment) {
@@ -454,12 +463,15 @@ class MainActivity :
 		}
 	}
 
-	private fun adjustDrawerLock() {
+	private fun adjustDrawerLock(
+		isSearchOpened: Boolean = isSearchOpened(),
+	) {
 		val drawer = drawer ?: return
-		val isLocked = actionModeDelegate.isActionModeStarted || (drawerToggle?.isDrawerIndicatorEnabled == false)
+		val isLocked = actionModeDelegate.isActionModeStarted || isSearchOpened
 		drawer.setDrawerLockMode(
 			if (isLocked) DrawerLayout.LOCK_MODE_LOCKED_CLOSED else DrawerLayout.LOCK_MODE_UNLOCKED
 		)
+		drawerToggle?.isDrawerIndicatorEnabled = !isLocked
 	}
 
 	private inner class VoiceInputCallback : ActivityResultCallback<String?> {

app/src/main/java/org/koitharu/kotatsu/search/ui/multi/MultiSearchActivity.kt

@@ -17,6 +17,7 @@ import org.koin.androidx.viewmodel.ext.android.viewModel
 import org.koin.core.parameter.parametersOf
 import org.koitharu.kotatsu.R
 import org.koitharu.kotatsu.base.ui.BaseActivity
+import org.koitharu.kotatsu.base.ui.list.ListSelectionController
 import org.koitharu.kotatsu.base.ui.list.OnListItemClickListener
 import org.koitharu.kotatsu.databinding.ActivitySearchMultiBinding
 import org.koitharu.kotatsu.details.ui.DetailsActivity
@@ -32,14 +33,14 @@ import org.koitharu.kotatsu.search.ui.multi.adapter.MultiSearchAdapter
 import org.koitharu.kotatsu.utils.ShareHelper
 import org.koitharu.kotatsu.utils.ext.findViewsByType
 
-class MultiSearchActivity : BaseActivity<ActivitySearchMultiBinding>(), MangaListListener, ActionMode.Callback {
+class MultiSearchActivity : BaseActivity<ActivitySearchMultiBinding>(), MangaListListener,
+	ListSelectionController.Callback {
 
 	private val viewModel by viewModel<MultiSearchViewModel> {
 		parametersOf(intent.getStringExtra(EXTRA_QUERY).orEmpty())
 	}
 	private lateinit var adapter: MultiSearchAdapter
-	private lateinit var selectionDecoration: MangaSelectionDecoration
+	private lateinit var selectionController: ListSelectionController
-	private var actionMode: ActionMode? = null
 
 	override fun onCreate(savedInstanceState: Bundle?) {
 		super.onCreate(savedInstanceState)
@@ -51,7 +52,13 @@ class MultiSearchActivity : BaseActivity<ActivitySearchMultiBinding>(), MangaLis
 			}
 		}
 		val sizeResolver = ItemSizeResolver(resources, get())
-		selectionDecoration = MangaSelectionDecoration(this)
+		val selectionDecoration = MangaSelectionDecoration(this)
+		selectionController = ListSelectionController(
+			activity = this,
+			decoration = selectionDecoration,
+			registryOwner = this,
+			callback = this,
+		)
 		adapter = MultiSearchAdapter(
 			lifecycleOwner = this,
 			coil = get(),
@@ -90,29 +97,14 @@ class MultiSearchActivity : BaseActivity<ActivitySearchMultiBinding>(), MangaLis
 	}
 
 	override fun onItemClick(item: Manga, view: View) {
-		if (selectionDecoration.checkedItemsCount != 0) {
+		if (!selectionController.onItemClick(item.id)) {
-			selectionDecoration.toggleItemChecked(item.id)
+			val intent = DetailsActivity.newIntent(this, item)
-			if (selectionDecoration.checkedItemsCount == 0) {
+			startActivity(intent)
-				actionMode?.finish()
-			} else {
-				actionMode?.invalidate()
-				invalidateItemDecorations()
-			}
-			return
 		}
-		val intent = DetailsActivity.newIntent(this, item)
-		startActivity(intent)
 	}
 
 	override fun onItemLongClick(item: Manga, view: View): Boolean {
-		if (actionMode == null) {
+		return selectionController.onItemLongClick(item.id)
-			actionMode = startSupportActionMode(this)
-		}
-		return actionMode?.also {
-			selectionDecoration.setItemIsChecked(item.id, true)
-			invalidateItemDecorations()
-			it.invalidate()
-		} != null
 	}
 
 	override fun onRetryClick(error: Throwable) {
@@ -131,7 +123,7 @@ class MultiSearchActivity : BaseActivity<ActivitySearchMultiBinding>(), MangaLis
 	}
 
 	override fun onPrepareActionMode(mode: ActionMode, menu: Menu): Boolean {
-		mode.title = selectionDecoration.checkedItemsCount.toString()
+		mode.title = selectionController.count.toString()
 		return true
 	}
 
@@ -156,22 +148,16 @@ class MultiSearchActivity : BaseActivity<ActivitySearchMultiBinding>(), MangaLis
 		}
 	}
 
-	override fun onDestroyActionMode(mode: ActionMode) {
+	override fun onSelectionChanged(count: Int) {
-		selectionDecoration.clearSelection()
-		invalidateItemDecorations()
-		actionMode = null
-	}
-
-	private fun collectSelectedItems(): Set<Manga> {
-		return viewModel.getItems(selectionDecoration.checkedItemsIds)
-	}
-
-	private fun invalidateItemDecorations() {
 		binding.recyclerView.findViewsByType(RecyclerView::class.java).forEach {
 			it.invalidateItemDecorations()
 		}
 	}
 
+	private fun collectSelectedItems(): Set<Manga> {
+		return viewModel.getItems(selectionController.peekCheckedIds())
+	}
+
 	companion object {
 
 		private const val EXTRA_QUERY = "query"