From f84fea5c0e638ed308d1a1a9d4aa4e27b2081321 Mon Sep 17 00:00:00 2001
From: yunji <yunji.me@outlook.com>
Date: Tue, 6 Jul 2021 17:22:11 +0800
Subject: [PATCH] feat(scene): add once event for scene

---
 packages/core/src/services/scene/ISceneService.ts | 1 +
 packages/scene/src/index.ts                       | 6 ++++++
 2 files changed, 7 insertions(+)

diff --git a/packages/core/src/services/scene/ISceneService.ts b/packages/core/src/services/scene/ISceneService.ts
index 28b77cf473..42cea47212 100644
--- a/packages/core/src/services/scene/ISceneService.ts
+++ b/packages/core/src/services/scene/ISceneService.ts
@@ -9,6 +9,7 @@ export interface ISceneService {
   fontFamily: string;
   loadFont: boolean;
   on(type: string, handle: (...args: any[]) => void): void;
+  once(type: string, handle: (...args: any[]) => void): void;
   off(type: string, handle: (...args: any[]) => void): void;
   removeAllListeners(event?: string): this;
   init(config: IMapConfig & IRenderConfig): void;
diff --git a/packages/scene/src/index.ts b/packages/scene/src/index.ts
index 6b5046edf8..b08a955be2 100644
--- a/packages/scene/src/index.ts
+++ b/packages/scene/src/index.ts
@@ -266,6 +266,12 @@ class Scene
       : this.sceneService.on(type, handle);
   }
 
+  public once(type: string, handle: (...args: any[]) => void): void {
+    SceneEventList.indexOf(type) === -1
+      ? this.mapService.once(type, handle)
+      : this.sceneService.once(type, handle);
+  }
+
   public off(type: string, handle: (...args: any[]) => void): void {
     SceneEventList.indexOf(type) === -1
       ? this.mapService.off(type, handle)