refactor: replace router

lib/main.dart

@@ -246,7 +246,12 @@ void main() async {
   ));
   themeModel.router.define('/:owner/:name', handler: Handler(
     handlerFunc: (context, params) {
+      if (params['ref'] == null) {
         return RepositoryScreen(params['owner'].first, params['name'].first);
+      } else {
+        return RepositoryScreen(params['owner'].first, params['name'].first,
+            branch: params['ref'].first);
+      }
     },
   ));
   themeModel.router.define('/:owner/:name/issues', handler: Handler(

lib/models/theme.dart

@@ -152,11 +152,17 @@ class ThemeModel with ChangeNotifier {
     notifyListeners();
   }
 
-  push(BuildContext context, String path) {
+  push(BuildContext context, String path, {bool replace = false}) {
-    return router.navigateTo(context, path,
+    return router.navigateTo(
-        transition: theme == AppThemeType.cupertino
+      context,
+      path,
+      transition: replace
+          ? TransitionType.fadeIn
+          : theme == AppThemeType.cupertino
               ? TransitionType.cupertino
-            : TransitionType.material);
+              : TransitionType.material,
+      replace: replace,
+    );
   }
 
   pushRoute(
@@ -178,10 +184,6 @@ class ThemeModel with ChangeNotifier {
     }
   }
 
-  pushReplacementRoute(BuildContext context, WidgetBuilder builder) {
-    return Navigator.of(context).pushReplacement(StaticRoute(builder: builder));
-  }
-
   Future<bool> showConfirm(BuildContext context, Widget content) {
     switch (theme) {
       case AppThemeType.cupertino:

lib/screens/repository.dart

@@ -249,14 +249,11 @@ class RepositoryScreen extends StatelessWidget {
                             items: refs
                                 .map((b) => PickerItem(b.name, text: b.name))
                                 .toList(),
-                            onClose: (result) {
+                            onClose: (ref) {
-                              if (result != branch) {
+                              if (ref != branch) {
-                                Provider.of<ThemeModel>(context)
+                                Provider.of<ThemeModel>(context).push(
-                                    .pushReplacementRoute(
+                                    context, '/$owner/$name?ref=$ref',
-                                  context,
+                                    replace: true);
-                                  (_) => RepositoryScreen(owner, name,
-                                      branch: result),
-                                );
                               }
                             },
                           ),