Bug 1845234 - Adds a new background gradient for TPBM

app/src/main/java/org/mozilla/fenix/theme/ThemeManager.kt

@@ -23,8 +23,11 @@ import org.mozilla.fenix.HomeActivity
 import org.mozilla.fenix.R
 import org.mozilla.fenix.browser.browsingmode.BrowsingMode
 import org.mozilla.fenix.customtabs.ExternalAppBrowserActivity
+import org.mozilla.fenix.ext.settings
 
-abstract class ThemeManager {
+abstract class ThemeManager(
+    private val privacyStyleRes: Int,
+) {
 
     abstract var currentTheme: BrowsingMode
 
@@ -34,7 +37,7 @@ abstract class ThemeManager {
     @get:StyleRes
     val currentThemeResource get() = when (currentTheme) {
         BrowsingMode.Normal -> R.style.NormalTheme
-        BrowsingMode.Private -> R.style.PrivateTheme
+        BrowsingMode.Private -> privacyStyleRes
     }
 
     /**
@@ -118,7 +121,7 @@ abstract class ThemeManager {
 class DefaultThemeManager(
     currentTheme: BrowsingMode,
     private val activity: Activity,
-) : ThemeManager() {
+) : ThemeManager(privacyStyleRes = activity.getStyleRes()) {
     override var currentTheme: BrowsingMode = currentTheme
         set(value) {
             if (currentTheme != value) {
@@ -136,3 +139,9 @@ class DefaultThemeManager(
             }
         }
 }
+
+private fun Activity.getStyleRes(): Int = if (settings().feltPrivateBrowsingEnabled) {
+    R.style.FeltPrivateTheme
+} else {
+    R.style.PrivateTheme
+}

app/src/main/res/drawable/felt_private_home_background_gradient.xml

@@ -0,0 +1,16 @@
+<?xml version="1.0" encoding="utf-8"?>
+<!-- This Source Code Form is subject to the terms of the Mozilla Public
+   - License, v. 2.0. If a copy of the MPL was not distributed with this
+   - file, You can obtain one at http://mozilla.org/MPL/2.0/. -->
+<selector xmlns:android="http://schemas.android.com/apk/res/android">
+    <item>
+        <shape>
+            <gradient
+                    android:angle="45"
+                    android:startColor="@color/fx_mobile_private_layer_color_4_start"
+                    android:centerColor="@color/fx_mobile_private_layer_color_4_center"
+                    android:endColor="@color/fx_mobile_private_layer_color_4_end"
+                    android:type="linear" />
+        </shape>
+    </item>
+</selector>

app/src/main/res/values/styles.xml

@@ -347,6 +347,9 @@
     </style>
 
     <style name="PrivateTheme" parent="PrivateThemeBase" />
+    <style name="FeltPrivateTheme" parent="PrivateThemeBase">
+        <item name="homeBackground">@drawable/felt_private_home_background_gradient</item>
+    </style>
 
     <!-- Fade animation for theme switching -->
     <style name="WindowAnimationTransition">