From 09f0ac866f0c387c18b35136c970cee50cc929cd Mon Sep 17 00:00:00 2001
From: Ivan Iskandar <12537387+ivaniskandar@users.noreply.github.com>
Date: Fri, 1 Oct 2021 20:13:00 +0700
Subject: [PATCH] Fix incorrect appbar lift state when opening MangaController
 in hidden state (#5990)

---
 .../appbar/HideToolbarOnScrollBehavior.kt      | 18 ++++++++----------
 1 file changed, 8 insertions(+), 10 deletions(-)

diff --git a/app/src/main/java/com/google/android/material/appbar/HideToolbarOnScrollBehavior.kt b/app/src/main/java/com/google/android/material/appbar/HideToolbarOnScrollBehavior.kt
index a6c9318812..1d5f01c002 100644
--- a/app/src/main/java/com/google/android/material/appbar/HideToolbarOnScrollBehavior.kt
+++ b/app/src/main/java/com/google/android/material/appbar/HideToolbarOnScrollBehavior.kt
@@ -77,6 +77,10 @@ class HideToolbarOnScrollBehavior : AppBarLayout.Behavior() {
         child: AppBarLayout,
         isVisible: Boolean
     ) {
+        val current = getTopBottomOffsetForScrollingSibling(child)
+        val target = if (isVisible) 0 else -toolbarHeight
+        if (current == target) return
+
         offsetAnimator?.cancel()
         offsetAnimator = ValueAnimator().apply {
             interpolator = DecelerateInterpolator()
@@ -85,18 +89,12 @@ class HideToolbarOnScrollBehavior : AppBarLayout.Behavior() {
                 setHeaderTopBottomOffset(coordinatorLayout, child, it.animatedValue as Int)
             }
             doOnEnd {
-                if (!isVisible &&
-                    !child.isLifted &&
-                    (child as? ElevationAppBarLayout)?.isTransparentWhenNotLifted == true
-                ) {
-                    child.isLifted = true
+                if ((child as? ElevationAppBarLayout)?.isTransparentWhenNotLifted == true) {
+                    child.isLifted = !isVisible
                 }
             }
+            setIntValues(current, target)
+            start()
         }
-        offsetAnimator?.setIntValues(
-            getTopBottomOffsetForScrollingSibling(child),
-            if (isVisible) 0 else -toolbarHeight
-        )
-        offsetAnimator?.start()
     }
 }