You cannot select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
46 lines
1.5 KiB
Dart
46 lines
1.5 KiB
Dart
import 'package:flutter/material.dart';
|
|
|
|
import '../../exceptions/api_exception.dart';
|
|
|
|
/// ## Change Notifier Class To Handle The State While Waiting The Futures Value
|
|
class LoadingNotifier with ChangeNotifier {
|
|
bool _loading = false;
|
|
|
|
/// - Returns [TRUE] if [waitApiRequest] function called
|
|
/// - Returns [FALSE] if [waitApiRequest] function completed in both states (failed, succeed)
|
|
bool get loading => _loading;
|
|
|
|
/// - [fun] : Callback function that contains the API request.
|
|
/// - [onError] : Optional callback function to handle the request on failure with [APIException] parameter.
|
|
/// - [onSuccess] : Optional callback function to handle the request on succeed.
|
|
Future waitApiRequest(Function fun, {Function(APIException)? onError, Function? onSuccess}) async {
|
|
if (_loading == true) {
|
|
debugPrint('loading_notifier.dart : another action already started');
|
|
return;
|
|
}
|
|
_loading = true;
|
|
debugPrint('loading_notifier.dart : start loading');
|
|
notifyListeners();
|
|
try {
|
|
await fun();
|
|
if (onSuccess != null) {
|
|
await onSuccess();
|
|
}
|
|
} on APIException catch (error) {
|
|
debugPrint("loading_notifier.dart : [_waitResult] returns this message ${error.message} : ${error.arguments} ${error.error?.errorCode} ");
|
|
if (onError != null) {
|
|
await onError(error);
|
|
}
|
|
} finally {
|
|
stopLoading();
|
|
debugPrint('loading_notifier.dart : stop loading');
|
|
}
|
|
}
|
|
|
|
/// ## Stop loading and Notify listeners
|
|
void stopLoading() {
|
|
_loading = false;
|
|
notifyListeners();
|
|
}
|
|
}
|