mirror of
https://github.com/openfoodfacts/smooth-app.git
synced 2025-08-06 18:25:11 +08:00
fd4c395383
The main goal is to avoid screen flickering at app start time, when the preference references are downloaded and notify a refresh (again and again everyday, with the same language). New file: * `downloadable_string.dart`: Downloadable String that may be stored (and compared to the previous value). Impacted files: * `main.dart`: refactored * `product_preferences.dart`: created explicit methods `init` and `refresh`; now stores locally the downloaded strings, that will be reused for the next app start * `user_preferences_page_test.dart`: refactored
42 lines
1.0 KiB
Dart
42 lines
1.0 KiB
Dart
import 'package:http/http.dart';
|
|
import 'package:smooth_app/database/dao_string.dart';
|
|
|
|
/// Downloadable String that may be stored (and compared to the previous value).
|
|
class DownloadableString {
|
|
DownloadableString(
|
|
this.uri, {
|
|
this.dao,
|
|
});
|
|
|
|
final Uri uri;
|
|
final DaoString? dao;
|
|
|
|
String? _value;
|
|
|
|
/// The actual string value.
|
|
String? get value => _value;
|
|
|
|
/// Downloads data and stores it locally if possible.
|
|
///
|
|
/// Returns true if the downloaded string is different
|
|
/// from the previously stored one.
|
|
/// May throw an Exception.
|
|
Future<bool> download() async {
|
|
final Response response = await get(uri);
|
|
if (response.statusCode != 200) {
|
|
throw Exception('status is ${response.statusCode} for $uri');
|
|
}
|
|
_value = response.body;
|
|
|
|
if (dao != null) {
|
|
final String key = uri.toString();
|
|
final String? previousString = await dao!.get(key);
|
|
if (_value == previousString) {
|
|
return false;
|
|
}
|
|
await dao!.put(key, _value);
|
|
}
|
|
return true;
|
|
}
|
|
}
|