Add EdgeToEdge and coreKtx dependency

Signed-off-by: Harsh Shandilya <me@msfjarvis.dev>

app/build.gradle

@@ -76,6 +76,7 @@ ext {
     annotationsVersion = '1.1.0'
     appcompatVersion = '1.1.0'
     cardviewVersion = '1.0.0'
+    coreKtxVersion = '1.2.0'
     coordinatorLayoutVersion = '1.1.3'
     databindingVersion = '3.6.0'
     materialComponentsVersion = '1.1.0'
@@ -95,6 +96,7 @@ dependencies {
     implementation "androidx.annotation:annotation:$annotationsVersion"
     implementation "androidx.appcompat:appcompat:$appcompatVersion"
     implementation "androidx.cardview:cardview:$cardviewVersion"
+    implementation "androidx.core:core-ktx:$coreKtxVersion"
     implementation "androidx.databinding:databinding-runtime:$databindingVersion"
     implementation "androidx.preference:preference:$preferenceVersion"
     implementation "com.google.android.material:material:$materialComponentsVersion"

app/src/main/java/com/wireguard/android/ui/EdgeToEdge.kt

@@ -0,0 +1,67 @@
+/*
+ * Copyright © 2017-2020 WireGuard LLC. All Rights Reserved.
+ * SPDX-License-Identifier: Apache-2.0
+ */
+package com.wireguard.android.ui
+
+import android.view.View
+import android.view.ViewGroup
+import androidx.core.view.marginBottom
+import androidx.core.view.marginLeft
+import androidx.core.view.marginRight
+import androidx.core.view.marginTop
+import androidx.core.view.updateLayoutParams
+import androidx.core.view.updatePadding
+import com.google.android.material.floatingactionbutton.ExtendedFloatingActionButton
+
+/**
+ * A utility for edge-to-edge display. It provides several features needed to make the app
+ * displayed edge-to-edge on Android Q with gestural navigation.
+ */
+
+object EdgeToEdge {
+
+    @JvmStatic
+    fun setUpRoot(root: ViewGroup) {
+        root.systemUiVisibility =
+            View.SYSTEM_UI_FLAG_LAYOUT_HIDE_NAVIGATION or View.SYSTEM_UI_FLAG_LAYOUT_STABLE
+    }
+
+    @JvmStatic
+    fun setUpScrollingContent(scrollingContent: ViewGroup, fab: ExtendedFloatingActionButton?) {
+        val originalPaddingLeft = scrollingContent.paddingLeft
+        val originalPaddingRight = scrollingContent.paddingRight
+        val originalPaddingBottom = scrollingContent.paddingBottom
+
+        val fabPaddingBottom = fab?.height ?: 0
+
+        val originalMarginTop = scrollingContent.marginTop
+
+        scrollingContent.setOnApplyWindowInsetsListener { _, windowInsets ->
+            scrollingContent.updatePadding(
+                left = originalPaddingLeft + windowInsets.systemWindowInsetLeft,
+                right = originalPaddingRight + windowInsets.systemWindowInsetRight,
+                bottom = originalPaddingBottom + fabPaddingBottom + windowInsets.systemWindowInsetBottom
+            )
+            scrollingContent.updateLayoutParams<ViewGroup.MarginLayoutParams> {
+                topMargin = originalMarginTop + windowInsets.systemWindowInsetTop
+            }
+            windowInsets
+        }
+    }
+
+    @JvmStatic
+    fun setUpFAB(fab: ExtendedFloatingActionButton) {
+        val originalMarginLeft = fab.marginLeft
+        val originalMarginRight = fab.marginRight
+        val originalMarginBottom = fab.marginBottom
+        fab.setOnApplyWindowInsetsListener { _, windowInsets ->
+            fab.updateLayoutParams<ViewGroup.MarginLayoutParams> {
+                leftMargin = originalMarginLeft + windowInsets.systemWindowInsetLeft
+                rightMargin = originalMarginRight + windowInsets.systemWindowInsetRight
+                bottomMargin = originalMarginBottom + windowInsets.systemWindowInsetBottom
+            }
+            windowInsets
+        }
+    }
+}