Updated logic to elevating the toolbar

app/src/main/java/eu/kanade/tachiyomi/ui/library/LibraryController.kt

@@ -2,7 +2,6 @@ package eu.kanade.tachiyomi.ui.library
 
 import android.animation.AnimatorSet
 import android.animation.ObjectAnimator
-import android.animation.ValueAnimator
 import android.app.Activity
 import android.content.Context
 import android.graphics.Color
@@ -177,8 +176,7 @@ class LibraryController(
     private var filterTooltip: ViewTooltip? = null
     private var isAnimatingHopper: Boolean? = null
     var hasMovedHopper = preferences.shownHopperSwipeTutorial().get()
-    private var elevationAnim: ValueAnimator? = null
+    private lateinit var elevateAppBar: ((Boolean) -> Unit)
-    private var elevate = false
 
     override fun getTitle(): String? {
         return view?.context?.getString(R.string.library)
@@ -188,8 +186,6 @@ class LibraryController(
         override fun onScrolled(recyclerView: RecyclerView, dx: Int, dy: Int) {
             super.onScrolled(recyclerView, dx, dy)
             val recyclerCover = recycler_cover ?: return
-            val notAtTop = recycler.canScrollVertically(-1)
-            if (notAtTop != elevate) elevateFunc(notAtTop)
             val order = getCategoryOrder()
             if (!recyclerCover.isClickable && isAnimatingHopper != true) {
                 category_hopper_frame.translationY += dy
@@ -372,6 +368,7 @@ class LibraryController(
             }
         }
 
+        elevateAppBar =
             scrollViewWith(recycler, swipeRefreshLayout = swipe_refresh, afterInsets = { insets ->
                 category_layout?.updateLayoutParams<ViewGroup.MarginLayoutParams> {
                     topMargin = recycler?.paddingTop ?: 0
@@ -379,6 +376,7 @@ class LibraryController(
                 fast_scroller?.updateLayoutParams<ViewGroup.MarginLayoutParams> {
                     topMargin = recycler?.paddingTop ?: 0
                 }
+                header_title?.updatePaddingRelative(top = insets.systemWindowInsetTop + 2.dpToPx)
             })
 
         swipe_refresh.setOnRefreshListener {
@@ -751,32 +749,20 @@ class LibraryController(
         category_hopper_frame.animate().translationY(translateY).start()
         recycler_cover.animate().translationY(translateY).start()
         recycler_cover.animate().alpha(if (show) 0.75f else 0f).start()
+        recycler.suppressLayout(show)
+        activity?.toolbar?.showDropdown(!show)
         if (show) {
             category_recycler.scrollToCategory(activeCategory)
             fast_scroller?.hideScrollbar()
             activity?.appbar?.y = 0f
-            elevateFunc(false)
+            elevateAppBar(false)
-            activity?.dropdown?.setImageResource(R.drawable.ic_arrow_drop_up_24dp)
             filter_bottom_sheet?.sheetBehavior?.hide()
         } else {
             val notAtTop = recycler.canScrollVertically(-1)
-            if (notAtTop != elevate) elevateFunc(notAtTop)
+            elevateAppBar(notAtTop)
-            activity?.dropdown?.setImageResource(R.drawable.ic_arrow_drop_down_24dp)
         }
     }
 
-    private fun elevateFunc(el: Boolean) {
-        elevate = el
-        elevationAnim?.cancel()
-        elevationAnim = ValueAnimator.ofFloat(
-            activity?.appbar?.elevation ?: 0f, if (el) 15f else 0f
-        )
-        elevationAnim?.addUpdateListener { valueAnimator ->
-            activity?.appbar?.elevation = valueAnimator.animatedValue as Float
-        }
-        elevationAnim?.start()
-    }
-
     fun setActiveCategory() {
         val currentCategory = presenter.categories.indexOfFirst {
             if (presenter.showAllCategories) it.order == activeCategory else presenter.currentCategory == it.id

app/src/main/java/eu/kanade/tachiyomi/util/view/ControllerExtensions.kt

@@ -62,7 +62,7 @@ fun Controller.scrollViewWith(
     swipeRefreshLayout: SwipeRefreshLayout? = null,
     afterInsets: ((WindowInsets) -> Unit)? = null,
     liftOnScroll: ((Boolean) -> Unit)? = null
-) {
+): ((Boolean) -> Unit) {
     var statusBarHeight = -1
     activity?.appbar?.y = 0f
     val attrsArray = intArrayOf(R.attr.actionBarSize)
@@ -98,7 +98,7 @@ fun Controller.scrollViewWith(
         elevate = el
         if (liftOnScroll != null) {
             liftOnScroll.invoke(el)
-        } else if (recycler.translationY == 0f) {
+        } else {
             elevationAnim?.cancel()
             elevationAnim = ValueAnimator.ofFloat(
                 activity?.appbar?.elevation ?: 0f, if (el) 15f else 0f
@@ -173,8 +173,8 @@ fun Controller.scrollViewWith(
                     activity!!.appbar.y = MathUtils.clamp(
                         activity!!.appbar.y, -activity!!.appbar.height.toFloat(), 0f
                     )
-                    if ((activity!!.appbar.y <= -activity!!.appbar.height.toFloat() ||
+                    if (((activity!!.appbar.y <= -activity!!.appbar.height.toFloat() ||
-                            dy == 0 && activity!!.appbar.y == 0f) && !elevate)
+                            dy == 0 && activity!!.appbar.y == 0f) || dy == 0) && !elevate)
                         elevateFunc(true)
                     lastY = activity!!.appbar.y
                 }
@@ -203,6 +203,7 @@ fun Controller.scrollViewWith(
             }
         }
     })
+    return elevateFunc
 }
 
 fun Controller.requestPermissionsSafe(permissions: Array<String>, requestCode: Int) {