feat: improve predictive back (#1487)

Signed-off-by: validcube <pun.butrach@gmail.com>

lib/services/manager_api.dart

@@ -582,8 +582,8 @@ class ManagerAPI {
     return showDialog(
       barrierDismissible: false,
       context: context,
-      builder: (context) => WillPopScope(
-        onWillPop: () async => false,
+      builder: (context) => PopScope(
+        canPop: false,
         child: AlertDialog(
           backgroundColor: Theme.of(context).colorScheme.secondaryContainer,
           title: I18nText('warning'),

lib/ui/views/installer/installer_view.dart

@@ -15,7 +15,8 @@ class InstallerView extends StatelessWidget {
     return ViewModelBuilder<InstallerViewModel>.reactive(
       onViewModelReady: (model) => model.initialize(context),
       viewModelBuilder: () => InstallerViewModel(),
-      builder: (context, model, child) => WillPopScope(
+      builder: (context, model, child) => PopScope(
+        onPopInvoked: (bool didPop) => model.onPopInvoked(context, didPop),
         child: SafeArea(
           top: false,
           bottom: model.isPatching,
@@ -83,7 +84,7 @@ class InstallerView extends StatelessWidget {
                     maxLines: 1,
                     overflow: TextOverflow.ellipsis,
                   ),
-                  onBackButtonPressed: () => model.onWillPop(context),
+                  onBackButtonPressed: () => model.onBackButtonInvoked(context),
                   bottom: PreferredSize(
                     preferredSize: const Size(double.infinity, 1.0),
                     child: GradientProgressIndicator(progress: model.progress),
@@ -111,7 +112,6 @@ class InstallerView extends StatelessWidget {
             ),
           ),
         ),
-        onWillPop: () => model.onWillPop(context),
       ),
     );
   }

lib/ui/views/installer/installer_viewmodel.dart

@@ -182,7 +182,8 @@ class InstallerViewModel extends BaseViewModel {
   Future<void> copyLogs() async {
     final info = await AboutInfo.getInfo();
     dynamic getValue(String patchName, Option option) {
-      final Option? savedOption = _managerAPI.getPatchOption(_app.packageName, patchName, option.key);
+      final Option? savedOption =
+          _managerAPI.getPatchOption(_app.packageName, patchName, option.key);
       if (savedOption != null) {
         return savedOption.value;
       } else {
@@ -203,7 +204,6 @@ class InstallerViewModel extends BaseViewModel {
       'App: ${_app.packageName} v${_app.version}',
       'Patches version: ${_managerAPI.patchesVersion}',
       'Patches: ${_patches.map((p) => p.name + (p.options.isEmpty ? '' : ' [${p.options.map((o) => '${o.title}: ${getValue(p.name, o)}').join(", ")}]')).toList().join(", ")}',
-      
       '\n- Settings',
       'Allow changing patch selection: ${_managerAPI.isPatchesChangeEnabled()}',
       'Version compatibility check: ${_managerAPI.isVersionCompatibilityCheckEnabled()}',
@@ -427,25 +427,38 @@ class InstallerViewModel extends BaseViewModel {
     }
   }
 
-  Future<bool> onWillPop(BuildContext context) async {
-    if (isPatching) {
-      if (!cancel) {
-        cancel = true;
-        _toast.showBottom('installerView.pressBackAgain');
-      } else if (!isCanceled) {
-        await stopPatcher();
-      } else {
-        _toast.showBottom('installerView.noExit');
-      }
-      return false;
-    }
-    if (!cancel) {
-      cleanPatcher();
+  bool canPop() {
+    return !isPatching;
+  }
+
+  void onBackButtonInvoked(BuildContext context) {
+    if (canPop()) {
+      onPopInvoked(context, true);
     } else {
-      _patcherAPI.cleanPatcher();
+      onPopInvoked(context, false);
+    }
+  }
+
+  Future<void> onPopInvoked(BuildContext context, bool didPop) async {
+    if (didPop) {
+      if (!cancel) {
+        cleanPatcher();
+      } else {
+        _patcherAPI.cleanPatcher();
+      }
+      screenshotCallback.dispose();
+      Navigator.of(context).pop();
+    } else {
+      if (isPatching) {
+        if (!cancel) {
+          cancel = true;
+          _toast.showBottom('installerView.pressBackAgain');
+        } else if (!isCanceled) {
+          await stopPatcher();
+        } else {
+          _toast.showBottom('installerView.noExit');
+        }
+      }
     }
-    screenshotCallback.dispose();
-    Navigator.of(context).pop();
-    return true;
   }
 }

lib/ui/views/navigation/navigation_view.dart

@@ -13,13 +13,11 @@ class NavigationView extends StatelessWidget {
     return ViewModelBuilder<NavigationViewModel>.reactive(
       onViewModelReady: (model) => model.initialize(context),
       viewModelBuilder: () => locator<NavigationViewModel>(),
-      builder: (context, model, child) => WillPopScope(
-        onWillPop: () async {
-          if (model.currentIndex == 0) {
-            return true;
-          } else {
+      builder: (context, model, child) => PopScope(
+        canPop: model.currentIndex == 0,
+        onPopInvoked: (bool didPop) {
+          if (!didPop) {
             model.setIndex(0);
-            return false;
           }
         },
         child: Scaffold(