Fix grid spacing

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

@@ -3,26 +3,16 @@ package org.koitharu.kotatsu.base.ui.list.decor
 import android.graphics.Rect
 import android.view.View
 import androidx.annotation.Px
-import androidx.recyclerview.widget.GridLayoutManager
 import androidx.recyclerview.widget.RecyclerView
 
 class SpacingItemDecoration(@Px private val spacing: Int) : RecyclerView.ItemDecoration() {
 
-	private val halfSpacing = spacing / 2
-
 	override fun getItemOffsets(
 		outRect: Rect,
 		view: View,
 		parent: RecyclerView,
 		state: RecyclerView.State
 	) {
-		val spans = (parent.layoutManager as? GridLayoutManager)?.spanCount ?: 1
-		val position = parent.getChildAdapterPosition(view)
-		outRect.set(
-			if (position % spans == 0) spacing else halfSpacing,
-			if (position < spans) spacing else halfSpacing,
-			if ((position + 1) % spans == 0) spacing else halfSpacing,
-			spacing //TODO check bottom
-		)
+		outRect.set(spacing, spacing, spacing, spacing)
 	}
 }

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

@@ -249,24 +249,21 @@ abstract class MangaListFragment : BaseFragment<FragmentListBinding>(),
 							RecyclerView.VERTICAL
 						)
 					)
+					updatePadding(left = 0, right = 0)
 				}
 				ListMode.DETAILED_LIST -> {
 					layoutManager = LinearLayoutManager(context)
-					addItemDecoration(
-						SpacingItemDecoration(
-							resources.getDimensionPixelOffset(R.dimen.grid_spacing)
-						)
-					)
+					val spacing = resources.getDimensionPixelOffset(R.dimen.grid_spacing)
+					updatePadding(left = spacing, right = spacing)
+					addItemDecoration(SpacingItemDecoration(spacing))
 				}
 				ListMode.GRID -> {
 					layoutManager = GridLayoutManager(context, spanResolver.spanCount).also {
 						it.spanSizeLookup = spanSizeLookup
 					}
-					addItemDecoration(
-						SpacingItemDecoration(
-							resources.getDimensionPixelOffset(R.dimen.grid_spacing)
-						)
-					)
+					val spacing = resources.getDimensionPixelOffset(R.dimen.grid_spacing)
+					addItemDecoration(SpacingItemDecoration(spacing))
+					updatePadding(left = spacing, right = spacing)
 					addOnLayoutChangeListener(spanResolver)
 				}
 			}

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

@@ -19,7 +19,6 @@ import org.koitharu.kotatsu.databinding.SheetPagesBinding
 import org.koitharu.kotatsu.list.ui.MangaListSpanResolver
 import org.koitharu.kotatsu.reader.ui.thumbnails.adapter.PageThumbnailAdapter
 import org.koitharu.kotatsu.utils.ext.mangaRepositoryOf
-import org.koitharu.kotatsu.utils.ext.resolveDp
 import org.koitharu.kotatsu.utils.ext.viewLifecycleScope
 import org.koitharu.kotatsu.utils.ext.withArgs
 
@@ -55,7 +54,9 @@ class PagesThumbnailsSheet : BaseBottomSheet<SheetPagesBinding>(),
 	override fun onViewCreated(view: View, savedInstanceState: Bundle?) {
 		super.onViewCreated(view, savedInstanceState)
 		with(binding.recyclerView) {
-			addItemDecoration(SpacingItemDecoration(view.resources.resolveDp(8)))
+			addItemDecoration(
+				SpacingItemDecoration(view.resources.getDimensionPixelOffset(R.dimen.grid_spacing))
+			)
 			adapter = PageThumbnailAdapter(
 				thumbnails,
 				get(),

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

@@ -44,6 +44,7 @@
 		android:layout_width="match_parent"
 		android:layout_height="wrap_content"
 		android:scrollbars="vertical"
+		android:padding="@dimen/grid_spacing"
 		app:layoutManager="androidx.recyclerview.widget.GridLayoutManager"
 		app:spanCount="3"
 		tools:listitem="@layout/item_page_thumb" />

app/src/main/res/values-w600dp/dimens.xml

@@ -1,5 +1,5 @@
 <?xml version="1.0" encoding="utf-8"?>
 <resources>
-	<dimen name="grid_spacing">7dp</dimen>
+	<dimen name="grid_spacing">4dp</dimen>
 	<dimen name="preferred_grid_width">140dp</dimen>
 </resources>

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

@@ -1,6 +1,6 @@
 <?xml version="1.0" encoding="utf-8"?>
 <resources>
-	<dimen name="grid_spacing">5dp</dimen>
+	<dimen name="grid_spacing">2dp</dimen>
 	<dimen name="manga_list_item_height">84dp</dimen>
 	<dimen name="manga_list_details_item_height">120dp</dimen>
 	<dimen name="chapter_list_item_height">46dp</dimen>