33 lines
910 B
Dart
33 lines
910 B
Dart
import 'dart:async';
|
|
|
|
/// 全局弹窗队列。
|
|
///
|
|
/// 用于登录后自动弹出的公告、更新、剪贴板分享链接等场景，保证同一时间
|
|
/// 只有一个弹窗/引导流程在前台显示。前一个流程结束后，后一个流程才会执行。
|
|
class DialogQueueService {
|
|
DialogQueueService._();
|
|
|
|
static final DialogQueueService instance = DialogQueueService._();
|
|
|
|
Future<void> _tail = Future<void>.value();
|
|
|
|
Future<T?> enqueue<T>(Future<T?> Function() task) {
|
|
final completer = Completer<T?>();
|
|
|
|
_tail = _tail.catchError((_) {}).then((_) async {
|
|
try {
|
|
final result = await task();
|
|
if (!completer.isCompleted) {
|
|
completer.complete(result);
|
|
}
|
|
} catch (error, stackTrace) {
|
|
if (!completer.isCompleted) {
|
|
completer.completeError(error, stackTrace);
|
|
}
|
|
}
|
|
});
|
|
|
|
return completer.future;
|
|
}
|
|
}
|