Fixed snackbar behavior in contrast with bottom navigation

app/src/main/java/com/topjohnwu/magisk/redesign/MainActivity.kt

@@ -24,6 +24,7 @@ import com.topjohnwu.magisk.redesign.log.LogFragment
 import com.topjohnwu.magisk.redesign.module.ModuleFragment
 import com.topjohnwu.magisk.redesign.settings.SettingsFragment
 import com.topjohnwu.magisk.redesign.superuser.SuperuserFragment
+import com.topjohnwu.magisk.utils.HideBottomViewOnScrollBehavior
 import com.topjohnwu.magisk.utils.HideTopViewOnScrollBehavior
 import com.topjohnwu.superuser.Shell
 import org.koin.androidx.viewmodel.ext.android.viewModel
@@ -62,6 +63,9 @@ open class MainActivity : CompatActivity<MainViewModel, ActivityMainMd2Binding>(
         binding.mainToolbarWrapper.updateLayoutParams<CoordinatorLayout.LayoutParams> {
             behavior = HideTopViewOnScrollBehavior<MaterialCardView>()
         }
+        binding.mainBottomBar.updateLayoutParams<CoordinatorLayout.LayoutParams> {
+            behavior = HideBottomViewOnScrollBehavior<MaterialCardView>()
+        }
         binding.mainNavigation.setOnNavigationItemSelectedListener {
             when (it.itemId) {
                 R.id.homeFragment -> Navigation.home()

app/src/main/java/com/topjohnwu/magisk/utils/HideBottomViewOnScrollBehavior.kt

@@ -0,0 +1,77 @@
+package com.topjohnwu.magisk.utils
+
+import android.view.View
+import android.view.ViewGroup
+import androidx.coordinatorlayout.widget.CoordinatorLayout
+import androidx.core.view.isVisible
+import androidx.core.view.updateLayoutParams
+import androidx.interpolator.view.animation.FastOutSlowInInterpolator
+import com.google.android.material.behavior.HideBottomViewOnScrollBehavior
+import com.google.android.material.snackbar.Snackbar
+import com.topjohnwu.magisk.R
+import kotlin.math.roundToInt
+
+class HideBottomViewOnScrollBehavior<T : View> : HideBottomViewOnScrollBehavior<T>() {
+
+    override fun layoutDependsOn(parent: CoordinatorLayout, child: T, dependency: View) =
+        super.layoutDependsOn(parent, child, dependency) or (dependency is Snackbar.SnackbarLayout)
+
+    override fun onDependentViewChanged(
+        parent: CoordinatorLayout,
+        child: T,
+        dependency: View
+    ) = when (dependency) {
+        is Snackbar.SnackbarLayout -> onDependentViewChanged(parent, child, dependency)
+        else -> super.onDependentViewChanged(parent, child, dependency)
+    }
+
+    override fun onDependentViewRemoved(
+        parent: CoordinatorLayout,
+        child: T,
+        dependency: View
+    ) = when (dependency) {
+        is Snackbar.SnackbarLayout -> onDependentViewRemoved(parent, child, dependency)
+        else -> super.onDependentViewRemoved(parent, child, dependency)
+    }
+
+    //---
+
+    private fun onDependentViewChanged(
+        parent: CoordinatorLayout,
+        child: T,
+        dependency: Snackbar.SnackbarLayout
+    ): Boolean {
+        val viewMargin = (child.layoutParams as ViewGroup.MarginLayoutParams).bottomMargin
+        val additionalMargin = dependency.resources.getDimension(R.dimen.l1).roundToInt()
+        val translation = dependency.height + additionalMargin
+
+        dependency.updateLayoutParams<ViewGroup.MarginLayoutParams> {
+            bottomMargin = viewMargin
+        }
+
+        // checks whether the navigation is not hidden via scroll
+        if (child.isVisible && child.translationY <= 0) {
+            child.translationY(-translation.toFloat())
+        }
+        return false
+    }
+
+    private fun onDependentViewRemoved(
+        parent: CoordinatorLayout,
+        child: T,
+        dependency: Snackbar.SnackbarLayout
+    ) {
+        // checks whether the navigation is not hidden via scroll
+        if (child.isVisible && child.translationY <= 0) {
+            child.translationY(0f)
+        }
+    }
+
+    //---
+
+    private fun View.translationY(destination: Float) = animate()
+        .translationY(destination)
+        .setInterpolator(FastOutSlowInInterpolator())
+        .start()
+
+}

app/src/main/res/layout/activity_main_md2.xml

@@ -56,7 +56,6 @@
             style="?styleCardElevated"
             android:layout_width="match_parent"
             android:layout_height="wrap_content"
-            app:layout_behavior="com.google.android.material.behavior.HideBottomViewOnScrollBehavior"
             android:layout_gravity="bottom"
             android:layout_marginStart="@dimen/l1"
             android:layout_marginEnd="@dimen/l1"