Fix Continue button behavior

app/src/main/java/org/koitharu/kotatsu/base/ui/util/ShrinkOnScrollBehavior.kt

@@ -8,10 +8,12 @@ import androidx.coordinatorlayout.widget.CoordinatorLayout.Behavior
 import androidx.core.view.ViewCompat
 import com.google.android.material.floatingactionbutton.ExtendedFloatingActionButton
 
-class ShrinkOnScrollBehavior : Behavior<ExtendedFloatingActionButton> {
+open class ShrinkOnScrollBehavior : Behavior<ExtendedFloatingActionButton> {
 
-	@Suppress("unused") constructor() : super()
-	@Suppress("unused") constructor(context: Context?, attrs: AttributeSet?) : super(context, attrs)
+	@Suppress("unused")
+	constructor() : super()
+	@Suppress("unused")
+	constructor(context: Context?, attrs: AttributeSet?) : super(context, attrs)
 
 	override fun onStartNestedScroll(
 		coordinatorLayout: CoordinatorLayout,
@@ -45,4 +47,4 @@ class ShrinkOnScrollBehavior : Behavior<ExtendedFloatingActionButton> {
 			}
 		}
 	}
-}
+}

app/src/main/java/org/koitharu/kotatsu/main/ui/MainActionButtonBehavior.kt

@@ -0,0 +1,39 @@
+package org.koitharu.kotatsu.main.ui
+
+import android.content.Context
+import android.util.AttributeSet
+import android.view.View
+import androidx.coordinatorlayout.widget.CoordinatorLayout
+import androidx.core.view.ViewCompat
+import com.google.android.material.floatingactionbutton.ExtendedFloatingActionButton
+import org.koitharu.kotatsu.base.ui.util.ShrinkOnScrollBehavior
+import org.koitharu.kotatsu.base.ui.widgets.SlidingBottomNavigationView
+
+class MainActionButtonBehavior : ShrinkOnScrollBehavior {
+
+	constructor() : super()
+	constructor(context: Context?, attrs: AttributeSet?) : super(context, attrs)
+
+	override fun layoutDependsOn(
+		parent: CoordinatorLayout,
+		child: ExtendedFloatingActionButton,
+		dependency: View
+	): Boolean {
+		return dependency is SlidingBottomNavigationView || super.layoutDependsOn(parent, child, dependency)
+	}
+
+	override fun onDependentViewChanged(
+		parent: CoordinatorLayout,
+		child: ExtendedFloatingActionButton,
+		dependency: View
+	): Boolean {
+		val bottom = child.bottom
+		val bottomLine = parent.height
+		return if (bottom > bottomLine) {
+			ViewCompat.offsetTopAndBottom(child, bottomLine - bottom)
+			true
+		} else {
+			false
+		}
+	}
+}

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

@@ -75,15 +75,12 @@
 		android:layout_width="wrap_content"
 		android:layout_height="wrap_content"
 		android:layout_marginHorizontal="16dp"
-		android:layout_marginBottom="-4dp"
-		android:paddingBottom="8dp"
 		android:text="@string/_continue"
 		android:visibility="gone"
-		app:backgroundTint="?attr/colorContainer"
 		app:icon="@drawable/ic_read"
 		app:layout_anchor="@id/bottomNav"
 		app:layout_anchorGravity="top|end"
-		app:layout_behavior="org.koitharu.kotatsu.base.ui.util.ShrinkOnScrollBehavior"
+		app:layout_behavior="org.koitharu.kotatsu.main.ui.MainActionButtonBehavior"
 		app:layout_dodgeInsetEdges="bottom"
 		app:layout_insetEdge="bottom"
 		tools:visibility="visible" />