ExactCalculator: Setup for edge to edge support

Change-Id: Id77e643af7600fac4599d9641e6bf887f18aa18e
Signed-off-by: Aayush Gupta <[email protected]>

res/drawable/activity_background.xml

@@ -0,0 +1,15 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!--
+     SPDX-FileCopyrightText: 2023 The LineageOS Project
+     SPDX-License-Identifier: Apache-2.0
+-->
+<rotate xmlns:android="http://schemas.android.com/apk/res/android"
+    android:fromDegrees="180">
+    <shape>
+        <gradient
+            android:centerX="-10.0"
+            android:startColor="@color/display_background_color"
+            android:endColor="?colorSurface"
+            android:type="sweep" />
+    </shape>
+</rotate>

res/layout-land/activity_calculator.xml

@@ -9,6 +9,7 @@
     android:id="@+id/main_calculator"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
+    android:background="@drawable/activity_background"
     android:orientation="vertical"
     app:layoutDescription="@xml/activity_calculator_scene">
 

res/layout/activity_calculator.xml

@@ -9,6 +9,7 @@
     android:id="@+id/main_calculator"
     android:layout_width="match_parent"
     android:layout_height="match_parent"
+    android:background="@drawable/activity_background"
     android:orientation="vertical"
     app:layoutDescription="@xml/activity_calculator_scene">
 

src/com/android/calculator2/Calculator.java

@@ -51,6 +51,10 @@
 import androidx.appcompat.widget.Toolbar;
 import androidx.constraintlayout.motion.widget.MotionLayout;
 import androidx.core.content.ContextCompat;
+import androidx.core.graphics.Insets;
+import androidx.core.view.ViewCompat;
+import androidx.core.view.WindowCompat;
+import androidx.core.view.WindowInsetsCompat;
 import androidx.fragment.app.Fragment;
 import androidx.fragment.app.FragmentManager;
 
@@ -304,6 +308,7 @@ protected void onCreate(Bundle savedInstanceState) {
         super.onCreate(savedInstanceState);
 
         setContentView(R.layout.activity_calculator);
+        setupEdgeToEdge();
         setSupportActionBar((Toolbar) findViewById(R.id.toolbar));
 
         // Hide all default options in the ActionBar.
@@ -1251,4 +1256,14 @@ public void onContextMenuClosed(Menu menu) {
     public interface OnDisplayMemoryOperationsListener {
         boolean shouldDisplayMemory();
     }
+
+    private void setupEdgeToEdge() {
+        WindowCompat.setDecorFitsSystemWindows(getWindow(), false);
+        ViewCompat.setOnApplyWindowInsetsListener(requireViewById(R.id.main_calculator),
+            (v, windowInsets) -> {
+                Insets insets = windowInsets.getInsets(WindowInsetsCompat.Type.systemBars());
+                v.setPadding(0, insets.top, 0, insets.bottom);
+                return WindowInsetsCompat.CONSUMED;
+            });
+    }
 }