更新

lib/common/util/EventBus.dart

@@ -0,0 +1,23 @@
+import 'dart:async';
+
+class EventBus {
+  static final EventBus _instance = EventBus._internal();
+  factory EventBus() => _instance;
+  EventBus._internal();
+
+  final _controller = StreamController.broadcast();
+
+  // 发出任意事件
+  void emit(event) {
+    _controller.add(event);
+  }
+
+  // 监听指定类型的事件
+  Stream<T> on<T>() {
+    return _controller.stream.where((event) => event is T).cast<T>();
+  }
+
+  void dispose() {
+    _controller.close();
+  }
+}