11import 'package:flutter/material.dart' ;
22import 'package:sample_app/app_themes.dart' ;
3+ import 'package:shared_preferences/shared_preferences.dart' ;
34
45class ThemeManager with ChangeNotifier {
5- ThemeData _themeData;
6- 7- /// Use this method on UI to get selected theme.
8- ThemeData get themeData {
9- if (_themeData == null ) {
10- _themeData = appThemeData[AppTheme .White ];
11- }
12- return _themeData;
13- }
6+ ThemeData _themeData;
7+ final String _kthemePreference = "theme_preference" ;
8+ 9+ ThemeManager (){
10+ _loadTheme ();
11+ }
12+ // Load saved theme
13+ void _loadTheme (){
14+ debugPrint ("Entered loadTheme" );
15+ SharedPreferences .getInstance ().then ((prefs){
16+ int preferedTheme = prefs.getInt (_kthemePreference) ?? 0 ;
17+ _themeData = appThemeData[AppTheme .values[preferedTheme]];
1418
15- /// Sets theme and notifies listeners about change.
16- setTheme (AppTheme theme) async {
17- _themeData = appThemeData[theme];
19+ // Notify listeners
20+ notifyListeners ();
21+ });
22+ }
23+ // Use this method on UI to get selected theme.
24+ ThemeData get themeData {
25+ if (_themeData == null ) {
26+ _themeData = appThemeData[AppTheme .White ];
27+ }
28+ return _themeData;
29+ }
1830
19- // Here we notify listeners that theme changed
20- // so UI have to be rebuild
21- notifyListeners ();
22- }
31+ // Sets theme and notifies listeners about change.
32+ setTheme (AppTheme theme) async {
33+ _themeData = appThemeData[theme];
34+ 35+ // Save the selected theme into Sharedpreferences
36+ var prefs = await SharedPreferences .getInstance ();
37+ prefs.setInt (_kthemePreference, AppTheme .values.indexOf (theme));
38+ // Here we notify listeners that theme changed
39+ // so UI have to be rebuild
40+ notifyListeners ();
41+ }
2342}
0 commit comments