Add app preview hiding

lib/backend/managers/shared_prefs_manager.dart

@@ -29,6 +29,7 @@ Future<void> setDefaultSettings([forceReset = false]) async {
   await sharedStorage.setBool("enable_watch_history", true);
   await sharedStorage.setBool("enable_search_history", true);
   await sharedStorage.setBool("keyboard_incognito_mode", true);
+  await sharedStorage.setBool("hide_app_preview", true);
   await sharedStorage.setBool("auto_play", false);
   await sharedStorage.setBool("show_progress_thumbnails", true);
   await sharedStorage.setInt("preferred_video_quality", 2160); // 4K

lib/main.dart

@@ -1,7 +1,10 @@
+import 'dart:io';
+
 import 'package:dynamic_color/dynamic_color.dart';
 import 'package:flutter/material.dart';
 import 'package:logger/logger.dart';
 import 'package:package_info_plus/package_info_plus.dart';
+import 'package:secure_app_switcher/secure_app_switcher.dart';
 import 'package:shared_preferences/shared_preferences.dart';
 
 import '/backend/custom_logger.dart';
@@ -24,6 +27,9 @@ final logger = Logger(
 );
 late PackageInfo packageInfo;
 
+/// This stores the global setting of whether the preview should be hidden
+bool hidePreview = true;
+
 void main() async {
   WidgetsFlutterBinding.ensureInitialized();
   logger.i("Initializing app");
@@ -46,7 +52,7 @@ class ViewerApp extends StatefulWidget {
       context.findAncestorStateOfType<ViewerAppState>();
 }
 
-class ViewerAppState extends State<ViewerApp> {
+class ViewerAppState extends State<ViewerApp> with WidgetsBindingObserver {
   bool updateAvailable = false;
   bool isDownloadingUpdate = false;
   bool updateFailed = false;
@@ -55,6 +61,8 @@ class ViewerAppState extends State<ViewerApp> {
   double downloadProgress = 0.0;
   UpdateManager updateManager = UpdateManager();
 
+  /// This controls whether the preview should be currently blocked
+  bool blockPreview = false;
   int _selectedIndex = 0;
   static List<Widget> screenList = <Widget>[
     const HomeScreen(),
@@ -66,6 +74,17 @@ class ViewerAppState extends State<ViewerApp> {
   @override
   void initState() {
     super.initState();
+    // Hide app preview by default
+    SecureAppSwitcher.on();
+    sharedStorage.getBool("hide_app_preview").then((value) {
+      if (!value!) {
+        SecureAppSwitcher.off();
+      }
+      setState(() => hidePreview = value);
+    });
+
+    // For detecting app state
+    WidgetsBinding.instance.addObserver(this);
     Future<List<String?>> updateResponseFuture = updateManager.checkForUpdate();
     updateResponseFuture.whenComplete(() async {
       List<String?> updateFuture = await updateResponseFuture;
@@ -84,10 +103,37 @@ class ViewerAppState extends State<ViewerApp> {
 
   @override
   void dispose() {
+    WidgetsBinding.instance.removeObserver(this);
     updateManager.removeListener(() {});
     super.dispose();
   }
 
+  // This is only necessary for desktops, as the mobile platforms have that feature built in
+  @override
+  void didChangeAppLifecycleState(AppLifecycleState state) {
+    if (hidePreview) {
+      logger.i("Lifecycle state changed to $state");
+      if (state == AppLifecycleState.paused ||
+          state == AppLifecycleState.inactive) {
+        logger.i("Lifecycle state is paused or inactive");
+        if (Platform.isWindows || Platform.isLinux || Platform.isMacOS) {
+          logger.i("Blurring app");
+          setState(() {
+            blockPreview = true;
+          });
+        }
+      } else if (state == AppLifecycleState.resumed) {
+        logger.i("Lifecycle state is resumed");
+        if (Platform.isWindows || Platform.isLinux || Platform.isMacOS) {
+          logger.i("Unblurring app");
+          setState(() {
+            blockPreview = false;
+          });
+        }
+      }
+    }
+  }
+
   @override
   Widget build(BuildContext context) {
     return DynamicColorBuilder(builder: (lightColorScheme, darkColorScheme) {
@@ -112,43 +158,50 @@ class ViewerAppState extends State<ViewerApp> {
                         brightness: Brightness.dark),
               ),
               themeMode: snapshot.data,
-              home: updateAvailable
-                  ? buildUpdateDialogue()
-                  : Scaffold(
-                      bottomNavigationBar: NavigationBar(
-                          destinations: <Widget>[
-                            NavigationDestination(
-                              icon: _selectedIndex == 0
-                                  ? const Icon(Icons.home)
-                                  : const Icon(Icons.home_outlined),
-                              label: "Home",
-                            ),
-                            NavigationDestination(
-                              icon: _selectedIndex == 1
-                                  ? const Icon(Icons.subscriptions)
-                                  : const Icon(Icons.subscriptions_outlined),
-                              label: "Subscriptions",
-                            ),
-                            NavigationDestination(
-                              icon: _selectedIndex == 2
-                                  ? const Icon(Icons.video_library)
-                                  : const Icon(Icons.video_library_outlined),
-                              label: "Library",
-                            ),
-                            NavigationDestination(
-                              icon: _selectedIndex == 3
-                                  ? const Icon(Icons.settings)
-                                  : const Icon(Icons.settings_outlined),
-                              label: "Settings",
-                            ),
-                          ],
-                          selectedIndex: _selectedIndex,
-                          onDestinationSelected: (index) {
-                            setState(() {
-                              _selectedIndex = index;
-                            });
-                          }),
-                      body: screenList.elementAt(_selectedIndex)),
+              home: Stack(children: [
+                updateAvailable
+                    ? buildUpdateDialogue()
+                    : Scaffold(
+                        bottomNavigationBar: NavigationBar(
+                            destinations: <Widget>[
+                              NavigationDestination(
+                                icon: _selectedIndex == 0
+                                    ? const Icon(Icons.home)
+                                    : const Icon(Icons.home_outlined),
+                                label: "Home",
+                              ),
+                              NavigationDestination(
+                                icon: _selectedIndex == 1
+                                    ? const Icon(Icons.subscriptions)
+                                    : const Icon(Icons.subscriptions_outlined),
+                                label: "Subscriptions",
+                              ),
+                              NavigationDestination(
+                                icon: _selectedIndex == 2
+                                    ? const Icon(Icons.video_library)
+                                    : const Icon(Icons.video_library_outlined),
+                                label: "Library",
+                              ),
+                              NavigationDestination(
+                                icon: _selectedIndex == 3
+                                    ? const Icon(Icons.settings)
+                                    : const Icon(Icons.settings_outlined),
+                                label: "Settings",
+                              ),
+                            ],
+                            selectedIndex: _selectedIndex,
+                            onDestinationSelected: (index) {
+                              setState(() {
+                                _selectedIndex = index;
+                              });
+                            }),
+                        body: screenList.elementAt(_selectedIndex)),
+                if (blockPreview) ...[
+                  Positioned.fill(
+                    child: Container(color: Colors.black),
+                  ),
+                ]
+              ]),
             );
           });
     });

lib/ui/screens/settings/settings_misc.dart

@@ -1,4 +1,7 @@
+import 'dart:io';
+
 import 'package:flutter/material.dart';
+import 'package:secure_app_switcher/secure_app_switcher.dart';
 
 import '/main.dart';
 import 'custom_widgets/options_switch.dart';
@@ -24,6 +27,32 @@ class _MiscScreenState extends State<MiscScreen> {
                 padding: const EdgeInsets.all(8),
                 child: Column(
                   children: <Widget>[
+                    FutureBuilder<bool?>(
+                        future: sharedStorage.getBool("hide_app_preview"),
+                        builder: (context, snapshot) {
+                          // only build when data finished loading
+                          if (snapshot.data == null) {
+                            return const SizedBox();
+                          }
+                          return OptionsSwitch(
+                              title: "Hide app preview",
+                              subTitle: "Hide app preview in app switcher",
+                              switchState: snapshot.data!,
+                              onToggled: (value) async {
+                                await sharedStorage.setBool(
+                                    "hide_app_preview", value);
+                                // Force an immediate update
+                                if (Platform.isAndroid || Platform.isIOS) {
+                                  if (!value) {
+                                    SecureAppSwitcher.off();
+                                  } else {
+                                    SecureAppSwitcher.on();
+                                  }
+                                }
+                                // the hidePreview var is from main.dart
+                                setState(() => hidePreview = value);
+                              });
+                        }),
                     FutureBuilder<bool?>(
                         future:
                             sharedStorage.getBool("keyboard_incognito_mode"),

pubspec.lock

@@ -438,10 +438,10 @@ packages:
     dependency: transitive
     description:
       name: path_provider_android
-      sha256: c464428172cb986b758c6d1724c603097febb8fb855aa265aeecc9280c294d4a
+      sha256: "8c4967f8b7cb46dc914e178daa29813d83ae502e0529d7b0478330616a691ef7"
       url: "https://pub.dev"
     source: hosted
-    version: "2.2.12"
+    version: "2.2.14"
   path_provider_foundation:
     dependency: transitive
     description:
@@ -554,6 +554,14 @@ packages:
       url: "https://pub.dev"
     source: hosted
     version: "0.2.0"
+  secure_app_switcher:
+    dependency: "direct main"
+    description:
+      name: secure_app_switcher
+      sha256: "6f8a1755d15358291e697d212a2a5a28a302cc14798c0849e8630c12b4df4efd"
+      url: "https://pub.dev"
+    source: hosted
+    version: "0.1.0+1"
   share_plus:
     dependency: "direct main"
     description:
@@ -675,10 +683,10 @@ packages:
     dependency: transitive
     description:
       name: sqlite3
-      sha256: bb174b3ec2527f9c5f680f73a89af8149dd99782fbb56ea88ad0807c5638f2ed
+      sha256: cb7f4e9dc1b52b1fa350f7b3d41c662e75fc3d399555fa4e5efcf267e9a4fbb5
       url: "https://pub.dev"
     source: hosted
-    version: "2.4.7"
+    version: "2.5.0"
   sqlite3_flutter_libs:
     dependency: "direct main"
     description:
@@ -915,10 +923,10 @@ packages:
     dependency: transitive
     description:
       name: win32
-      sha256: "84ba388638ed7a8cb3445a320c8273136ab2631cd5f2c57888335504ddab1bc2"
+      sha256: "8b338d4486ab3fbc0ba0db9f9b4f5239b6697fcee427939a40e720cbb9ee0a69"
       url: "https://pub.dev"
     source: hosted
-    version: "5.8.0"
+    version: "5.9.0"
   window_manager:
     dependency: "direct main"
     description:

pubspec.yaml

@@ -42,6 +42,7 @@ dependencies:
   share_plus: ^10.0.2
   html_unescape: ^2.0.0
   linkify: ^5.0.0
+  secure_app_switcher: ^0.1.0+1
 
 
 dev_dependencies: