🎨 utils-EventBus添加null-safe (LianjiaTech#23)

* 🎨 utils-EventBus添加null-safe * 🎨 修改theme配置功能及utils/brn_tools工具函数 null-safe * 🎨 EventBus添加null-safe(其他提交请忽略,输入回退) Co-authored-by: 大脸儿 <[email protected]>
leftcoding · Dec 31, 2021 · c0ff1cb · c0ff1cb
1 parent 09ca6d7
commit c0ff1cb
Showing 1 changed file with 17 additions and 1 deletion.
diff --git a/lib/src/utils/brn_event_bus.dart b/lib/src/utils/brn_event_bus.dart
@@ -63,7 +63,8 @@ class EventBus {
   /// listener is affected. A paused listener will buffer events internally until
   /// resumed or cancelled. So it's usually better to just cancel and later
   /// subscribe again (avoids memory leak).
-  Stream<T> on<T>() {
+  ///
+  Stream on<T>() {
     if (T == dynamic) {
       return streamController.stream as Stream<T>;
     }
@@ -79,4 +80,19 @@ class EventBus {
   void destroy() {
     _streamController.close();
   }
+  static EventBus? _instance;
+
+  factory EventBus.init() {
+    if (_instance == null) {
+      _instance = EventBus();
+    }
+    return _instance!;
+  }
+
+  static EventBus get instance {
+    if (_instance == null) {
+      EventBus.init();
+    }
+    return _instance!;
+  }
 }