Add "Grid mode" option to explore options menu

app/src/main/java/org/koitharu/kotatsu/explore/ui/ExploreFragment.kt

@@ -36,6 +36,7 @@ import org.koitharu.kotatsu.parsers.model.MangaSource
 import org.koitharu.kotatsu.search.ui.MangaListActivity
 import org.koitharu.kotatsu.settings.SettingsActivity
 import org.koitharu.kotatsu.suggestions.ui.SuggestionsActivity
+import org.koitharu.kotatsu.utils.ext.addMenuProvider
 import org.koitharu.kotatsu.utils.ext.getDisplayMessage
 import javax.inject.Inject
 
@@ -70,6 +71,7 @@ class ExploreFragment :
 			val spacing = resources.getDimensionPixelOffset(R.dimen.list_spacing)
 			paddingHorizontal = spacing
 		}
+		addMenuProvider(ExploreMenuProvider(view.context, viewModel))
 		viewModel.content.observe(viewLifecycleOwner) {
 			exploreAdapter?.items = it
 		}
@@ -162,6 +164,7 @@ class ExploreFragment :
 		} else {
 			LinearLayoutManager(requireContext())
 		}
+		activity?.invalidateOptionsMenu()
 	}
 
 	private inner class SourceMenuListener(

app/src/main/java/org/koitharu/kotatsu/explore/ui/ExploreMenuProvider.kt

@@ -0,0 +1,34 @@
+package org.koitharu.kotatsu.explore.ui
+
+import android.content.Context
+import android.view.Menu
+import android.view.MenuInflater
+import android.view.MenuItem
+import androidx.core.view.MenuProvider
+import org.koitharu.kotatsu.R
+
+class ExploreMenuProvider(
+	private val context: Context,
+	private val viewModel: ExploreViewModel,
+) : MenuProvider {
+
+	override fun onCreateMenu(menu: Menu, menuInflater: MenuInflater) {
+		menuInflater.inflate(R.menu.opt_explore, menu)
+	}
+
+	override fun onMenuItemSelected(menuItem: MenuItem): Boolean {
+		return when (menuItem.itemId) {
+			R.id.action_grid -> {
+				viewModel.setGridMode(!menuItem.isChecked)
+				true
+			}
+
+			else -> false
+		}
+	}
+
+	override fun onPrepareMenu(menu: Menu) {
+		super.onPrepareMenu(menu)
+		menu.findItem(R.id.action_grid)?.isChecked = viewModel.isGrid.value == true
+	}
+}

app/src/main/java/org/koitharu/kotatsu/explore/ui/ExploreViewModel.kt

@@ -69,6 +69,10 @@ class ExploreViewModel @Inject constructor(
 		}
 	}
 
+	fun setGridMode(value: Boolean) {
+		settings.isSourcesGridMode = value
+	}
+
 	private fun createContentFlow() = settings.observe()
 		.filter {
 			it == AppSettings.KEY_SOURCES_HIDDEN ||

app/src/main/res/menu/opt_explore.xml

@@ -0,0 +1,11 @@
+<?xml version="1.0" encoding="utf-8"?>
+<menu
+	xmlns:android="http://schemas.android.com/apk/res/android">
+
+	<item
+		android:id="@+id/action_grid"
+		android:checkable="true"
+		android:title="@string/show_in_grid_view"
+		android:titleCondensed="@string/grid" />
+
+</menu>