feat: add configurable main page back behavior (#870)

* feat: add configurable main page back behavior

Add setting to control whether back button exits directly or returns to first tab

* update

---------

Co-authored-by: bggRGjQaUbCoE <githubaccount56556@proton.me>

lib/pages/main/controller.dart

@@ -46,6 +46,8 @@ class MainController extends GetxController
   late bool navSearchStreamDebounce = Pref.navSearchStreamDebounce;
   late final optTabletNav = Pref.optTabletNav;
 
+  late bool directExitOnBack = Pref.directExitOnBack;
+
   @override
   void onInit() {
     super.onInit();

lib/pages/main/view.dart

@@ -159,6 +159,14 @@ class _MainAppState extends State<MainApp>
     super.dispose();
   }
 
+  void onBack() {
+    if (Platform.isAndroid) {
+      Utils.channel.invokeMethod('back');
+    } else {
+      SystemNavigator.pop();
+    }
+  }
+
   @override
   Widget build(BuildContext context) {
     final theme = Theme.of(context);
@@ -166,15 +174,15 @@ class _MainAppState extends State<MainApp>
     return PopScope(
       canPop: false,
       onPopInvokedWithResult: (bool didPop, Object? result) {
-        if (_mainController.selectedIndex.value != 0) {
-          setIndex(0);
-          _mainController.bottomBarStream?.add(true);
-          _homeController.searchBarStream?.add(true);
+        if (_mainController.directExitOnBack) {
+          onBack();
         } else {
-          if (Platform.isAndroid) {
-            Utils.channel.invokeMethod('back');
+          if (_mainController.selectedIndex.value != 0) {
+            setIndex(0);
+            _mainController.bottomBarStream?.add(true);
+            _homeController.searchBarStream?.add(true);
           } else {
-            SystemNavigator.pop();
+            onBack();
           }
         }
       },

lib/pages/setting/models/style_settings.dart

@@ -623,6 +623,17 @@ List<SettingsModel> get styleSettings => [
         subtitle: '删除或调换Navbar',
         leading: const Icon(Icons.toc_outlined),
       ),
+      SettingsModel(
+        settingsType: SettingsType.sw1tch,
+        title: '返回时直接退出',
+        subtitle: '开启后在主页任意tab按返回键都直接退出，关闭则先回到Navbar的第一个tab',
+        leading: const Icon(Icons.exit_to_app_outlined),
+        setKey: SettingBoxKey.directExitOnBack,
+        defaultVal: false,
+        onChanged: (value) {
+          Get.find<MainController>().directExitOnBack = value;
+        },
+      ),
       if (Platform.isAndroid)
         SettingsModel(
           settingsType: SettingsType.normal,