flutter: refactor: Move countdown dialog to dialog.dart

src/ui/flutter_app/lib/widgets/dialog.dart

@@ -0,0 +1,98 @@
+/*
+  This file is part of Sanmill.
+  Copyright (C) 2019-2021 The Sanmill developers (see AUTHORS file)
+
+  Sanmill is free software: you can redistribute it and/or modify
+  it under the terms of the GNU General Public License as published by
+  the Free Software Foundation, either version 3 of the License, or
+  (at your option) any later version.
+
+  Sanmill is distributed in the hope that it will be useful,
+  but WITHOUT ANY WARRANTY; without even the implied warranty of
+  MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
+  GNU General Public License for more details.
+
+  You should have received a copy of the GNU General Public License
+  along with this program.  If not, see <http://www.gnu.org/licenses/>.
+*/
+
+import 'dart:async';
+import 'dart:io';
+
+import 'package:flutter/material.dart';
+import 'package:flutter/services.dart';
+import 'package:sanmill/generated/l10n.dart';
+
+int _counter = 0;
+Timer? _timer;
+
+void startTimer(var counter, var events) {
+  _counter = counter;
+  if (_timer != null) {
+    _timer!.cancel();
+  }
+  _timer = Timer.periodic(Duration(seconds: 1), (timer) {
+    (_counter > 0) ? _counter-- : _timer!.cancel();
+    events.add(_counter);
+  });
+}
+
+void showCountdownDialog(
+    BuildContext ctx, var seconds, var events, void fun()) {
+  var alert = AlertDialog(
+    content: StreamBuilder<int>(
+      stream: events.stream,
+      builder: (BuildContext context, AsyncSnapshot<int> snapshot) {
+        print("Count down: " + snapshot.data.toString());
+
+        if (snapshot.data == 0) {
+          fun();
+          if (Platform.isAndroid) {
+            SystemChannels.platform.invokeMethod('SystemNavigator.pop');
+          } else {}
+        }
+
+        return Container(
+          height: 128,
+          child: Column(
+            crossAxisAlignment: CrossAxisAlignment.center,
+            children: <Widget>[
+              Text(
+                snapshot.data != null ? '${snapshot.data.toString()}' : "10",
+                style: TextStyle(fontSize: 64),
+              ),
+              SizedBox(
+                height: 20,
+              ),
+              InkWell(
+                onTap: () {
+                  Navigator.of(context).pop();
+                },
+                child: Container(
+                  child: Center(
+                      child: Text(
+                    S.of(ctx).cancel,
+                    style: TextStyle(
+                      color: Colors.black,
+                      fontSize: 16,
+                      fontWeight: FontWeight.bold,
+                    ),
+                  )),
+                ),
+              ),
+            ],
+          ),
+        );
+      },
+    ),
+  );
+
+  startTimer(seconds, events);
+
+  showDialog(
+    context: ctx,
+    builder: (BuildContext c) {
+      return alert;
+    },
+  );
+}

src/ui/flutter_app/lib/widgets/game_settings_page.dart

@@ -20,7 +20,6 @@ import 'dart:async';
 import 'dart:io';
 
 import 'package:flutter/material.dart';
-import 'package:flutter/services.dart';
 import 'package:sanmill/common/config.dart';
 import 'package:sanmill/common/settings.dart';
 import 'package:sanmill/generated/l10n.dart';
@@ -29,6 +28,7 @@ import 'package:sanmill/widgets/settings_card.dart';
 import 'package:sanmill/widgets/settings_list_tile.dart';
 import 'package:sanmill/widgets/settings_switch_list_tile.dart';
 
+import 'dialog.dart';
 import 'list_item_divider.dart';
 
 class Developer {
@@ -44,9 +44,7 @@ class _GameSettingsPageState extends State<GameSettingsPage> {
   Color pickerColor = Color(0xFF808080);
   Color currentColor = Color(0xFF808080);
 
-  int _counter = 0;
   late StreamController<int> _events;
-  Timer? _timer;
 
   final String tag = "[game_settings_page]";
 
@@ -57,75 +55,9 @@ class _GameSettingsPageState extends State<GameSettingsPage> {
     _events.add(10);
   }
 
-  void _startTimer() {
-    _counter = 10;
-    if (_timer != null) {
-      _timer!.cancel();
-    }
-    _timer = Timer.periodic(Duration(seconds: 1), (timer) {
-      (_counter > 0) ? _counter-- : _timer!.cancel();
-      _events.add(_counter);
-    });
-  }
-
   void _restore() async {
-    final profile = await Settings.instance();
+    final settings = await Settings.instance();
-    await profile.restore();
+    await settings.restore();
-  }
-
-  void showCountdownDialog(BuildContext ctx) {
-    var alert = AlertDialog(
-        content: StreamBuilder<int>(
-            stream: _events.stream,
-            builder: (BuildContext context, AsyncSnapshot<int> snapshot) {
-              print("Count down: " + snapshot.data.toString());
-
-              if (snapshot.data == 0) {
-                _restore();
-                if (Platform.isAndroid) {
-                  SystemChannels.platform.invokeMethod('SystemNavigator.pop');
-                } else {}
-              }
-
-              return Container(
-                height: 128,
-                child: Column(
-                  crossAxisAlignment: CrossAxisAlignment.center,
-                  children: <Widget>[
-                    Text(
-                        snapshot.data != null
-                            ? '${snapshot.data.toString()}'
-                            : "10",
-                        style: TextStyle(
-                          fontSize: 64,
-                        )),
-                    SizedBox(
-                      height: 20,
-                    ),
-                    InkWell(
-                      onTap: () {
-                        Navigator.of(context).pop();
-                      },
-                      child: Container(
-                        child: Center(
-                            child: Text(
-                          S.of(ctx).cancel,
-                          style: TextStyle(
-                              color: Colors.black,
-                              fontSize: 16,
-                              fontWeight: FontWeight.bold),
-                        )),
-                      ),
-                    ),
-                  ],
-                ),
-              );
-            }));
-    showDialog(
-        context: ctx,
-        builder: (BuildContext c) {
-          return alert;
-        });
   }
 
   SliderTheme _skillLevelSliderTheme(context, setState) {
@@ -174,8 +106,7 @@ class _GameSettingsPageState extends State<GameSettingsPage> {
     confirm() async {
       Navigator.of(context).pop();
       if (Platform.isAndroid) {
-        _startTimer();
+        showCountdownDialog(context, 10, _events, _restore);
-        showCountdownDialog(context);
       } else {
         _restore();
         ScaffoldMessenger.of(context).showSnackBar(