Dim navbar in details screen

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

@@ -152,8 +152,9 @@ class DetailsActivity :
 		TitleScrollCoordinator(viewBinding.textViewTitle).attach(viewBinding.scrollView)
 		viewBinding.containerBottomSheet?.let { sheet ->
 			onBackPressedDispatcher.addCallback(BottomSheetCollapseCallback(sheet))
-			BottomSheetBehavior.from(sheet)
-				.addBottomSheetCallback(DetailsBottomSheetCallback(viewBinding.swipeRefreshLayout))
+			BottomSheetBehavior.from(sheet).addBottomSheetCallback(
+				DetailsBottomSheetCallback(viewBinding.swipeRefreshLayout, checkNotNull(viewBinding.navbarDim)),
+			)
 		}
 		TitleExpandListener(viewBinding.textViewTitle).attach()
 

app/src/main/kotlin/org/koitharu/kotatsu/details/ui/DetailsBottomSheetCallback.kt

@@ -3,14 +3,18 @@ package org.koitharu.kotatsu.details.ui
 import android.view.View
 import androidx.swiperefreshlayout.widget.SwipeRefreshLayout
 import com.google.android.material.bottomsheet.BottomSheetBehavior
+import org.koitharu.kotatsu.core.ui.widgets.WindowInsetHolder
 
 class DetailsBottomSheetCallback(
 	private val swipeRefreshLayout: SwipeRefreshLayout,
+	private val navbarDimView: WindowInsetHolder,
 ) : BottomSheetBehavior.BottomSheetCallback() {
 
 	override fun onStateChanged(bottomSheet: View, newState: Int) {
 		swipeRefreshLayout.isEnabled = newState == BottomSheetBehavior.STATE_COLLAPSED
 	}
 
-	override fun onSlide(bottomSheet: View, slideOffset: Float) = Unit
+	override fun onSlide(bottomSheet: View, slideOffset: Float) {
+		navbarDimView.alpha = 1f - slideOffset.coerceAtLeast(0f)
+	}
 }

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

@@ -317,4 +317,13 @@
 		app:layout_behavior="com.google.android.material.bottomsheet.BottomSheetBehavior"
 		tools:layout="@layout/sheet_chapters_pages" />
 
+	<org.koitharu.kotatsu.core.ui.widgets.WindowInsetHolder
+		android:layout_width="match_parent"
+		android:layout_height="wrap_content"
+		android:layout_gravity="bottom"
+		android:elevation="9dp"
+		tools:layout_height="10dp"
+		android:id="@+id/navbarDim"
+		android:background="@color/dim2" />
+
 </androidx.coordinatorlayout.widget.CoordinatorLayout>

app/src/main/res/values-night/colors.xml

@@ -9,6 +9,7 @@
 	<color name="launcher_background">#222222</color>
 	<color name="common_green">#81C784</color>
 	<color name="common_red">#E57373</color>
+	<color name="dim2">#C8000000</color>
 
 	<!-- Color schemes colors -->
 	<color name="background_miku">#191C1C</color>

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

@@ -15,6 +15,7 @@
 	<color name="blue_primary">#1976D2</color>
 	<color name="grey">#424242</color>
 	<color name="dim">#99000000</color>
+	<color name="dim2">#C8FFFFFF</color>
 	<color name="warning">#E65100</color>
 	<color name="launcher_background">#FFFFFF</color>
 	<color name="common_green">#388E3C</color>