Settings page and theme selection

lib/pages/settings/lookandfeel_settings.part.dart

@@ -0,0 +1,79 @@
+part of '../../main.dart';
+
+class LookAndFeelSettingsPage extends StatefulWidget {
+  LookAndFeelSettingsPage({Key key, this.title}) : super(key: key);
+
+  final String title;
+
+  @override
+  _LookAndFeelSettingsPageState createState() => new _LookAndFeelSettingsPageState();
+}
+
+class _LookAndFeelSettingsPageState extends State<LookAndFeelSettingsPage> {
+
+  AppTheme _currentTheme;
+  bool _changed = false;
+
+  @override
+  void initState() {
+    super.initState();
+    _loadSettings();
+  }
+
+  _loadSettings() async {
+    SharedPreferences prefs = await SharedPreferences.getInstance();
+    await prefs.reload();
+    SharedPreferences.getInstance().then((prefs) {
+      setState(() {
+        _currentTheme = AppTheme.values[prefs.getInt("app-theme") ?? AppTheme.defaultTheme];
+      });
+    });
+  }
+
+  _saveSettings(AppTheme theme) {
+    SharedPreferences.getInstance().then((prefs) {
+      prefs.setInt('app-theme', theme.index);
+      setState(() {
+        _currentTheme = theme;
+        eventBus.fire(ChangeThemeEvent(_currentTheme));
+      });
+    });
+  }
+
+  Map appThemeName = {
+    AppTheme.defaultTheme: 'Default',
+    AppTheme.haTheme: 'Home Assistant theme',
+    AppTheme.darkTheme: 'Dark theme'
+  };
+
+  @override
+  Widget build(BuildContext context) {
+    return ListView(
+      scrollDirection: Axis.vertical,
+      padding: const EdgeInsets.all(20.0),
+      children: <Widget>[
+          Text("Application scheme:", style: Theme.of(context).textTheme.body2),
+          Container(height: Sizes.rowPadding),
+          DropdownButton<AppTheme>(
+            value: _currentTheme,
+            iconSize: 30.0,
+            isExpanded: true,
+            style: Theme.of(context).textTheme.title,
+            //hint: Text("Select ${caption.toLowerCase()}"),
+            items: AppTheme.values.map((value) {
+              return new DropdownMenuItem<AppTheme>(
+                value: value,
+                child: Text('${appThemeName[value]}'),
+              );
+            }).toList(),
+            onChanged: (theme) => _saveSettings(theme),
+          )
+        ]
+      );
+  }
+
+  @override
+  void dispose() {
+    super.dispose();
+  }
+}