From 4416a675ad991f74207a89556ef42656ef665dfe Mon Sep 17 00:00:00 2001
From: Luigi Rosso <luigi.rosso@gmail.com>
Date: Fri, 26 Apr 2019 12:32:39 -0700
Subject: [PATCH] Preventing double load.

---
 flare_flutter/lib/flare_actor.dart      |  6 +++++-
 flare_flutter/lib/flare_render_box.dart | 19 +++++++++++++++----
 2 files changed, 20 insertions(+), 5 deletions(-)

diff --git a/flare_flutter/lib/flare_actor.dart b/flare_flutter/lib/flare_actor.dart
index 32fdd9e..578d52f 100644
--- a/flare_flutter/lib/flare_actor.dart
+++ b/flare_flutter/lib/flare_actor.dart
@@ -216,6 +216,9 @@ class FlareActorRenderObject extends FlareRenderBox {
 
   @override
   void load() {
+    if (_filename == null) {
+      return;
+    }
     super.load();
     loadFlare(_filename).then((FlutterActor actor) {
       if (actor == null || actor.artboard == null) {
@@ -302,7 +305,8 @@ class FlareActorRenderObject extends FlareRenderBox {
       }
     }
 
-    if (_artboard != null && _controller != null &&
+    if (_artboard != null &&
+        _controller != null &&
         !_controller.advance(_artboard, elapsedSeconds)) {
       _controller?.isActive?.value = false;
     }
diff --git a/flare_flutter/lib/flare_render_box.dart b/flare_flutter/lib/flare_render_box.dart
index 42092db..65e4036 100644
--- a/flare_flutter/lib/flare_render_box.dart
+++ b/flare_flutter/lib/flare_render_box.dart
@@ -26,7 +26,7 @@ abstract class FlareRenderBox extends RenderBox {
     }
     _assetBundle = value;
     if (_assetBundle != null) {
-      load();
+      _load();
     }
   }
 
@@ -81,7 +81,7 @@ abstract class FlareRenderBox extends RenderBox {
     super.attach(owner);
     updatePlayState();
     if (_assets.isEmpty && assetBundle != null) {
-      load();
+      _load();
     }
   }
 
@@ -202,11 +202,22 @@ abstract class FlareRenderBox extends RenderBox {
   /// Advance animations, physics, etc by elapsedSeconds.
   void advance(double elapsedSeconds);
 
-  /// Perform any loading logic necessary for this scene.
-  void load() {
+  bool _isLoading = false;
+  bool get isLoading => _isLoading;
+
+  void _load() async {
+    if (_isLoading) {
+      return;
+    }
+    _isLoading = true;
     _unload();
+    await load();
+    _isLoading = false;
   }
 
+  /// Perform any loading logic necessary for this scene.
+  void load() async {}
+
   void _unload() {
     for (final FlareCacheAsset asset in _assets) {
       asset.deref();