From af219f8836bf7c10c4c114fe23acd3a3f2b69f92 Mon Sep 17 00:00:00 2001
From: Sidharth Guglani <sidharthguglani@fb.com>
Date: Mon, 10 Jun 2019 01:43:25 -0700
Subject: [PATCH] add node layout event and pass it java layer

Summary: Listen to NodeLayout event and passes this event callback to java layer along with the information whether layout or measure was done in this pass

Reviewed By: davidaurelio

Differential Revision: D15696021

fbshipit-source-id: 8c5ca69330a9baca26b77052d4965cc67fe97c75
---
 java/com/facebook/yoga/YogaEventListener.java | 2 ++
 yoga/Yoga.cpp                                 | 2 +-
 yoga/event/event.h                            | 6 ++++++
 3 files changed, 9 insertions(+), 1 deletion(-)

diff --git a/java/com/facebook/yoga/YogaEventListener.java b/java/com/facebook/yoga/YogaEventListener.java
index 97791224..cc7e9ebd 100644
--- a/java/com/facebook/yoga/YogaEventListener.java
+++ b/java/com/facebook/yoga/YogaEventListener.java
@@ -12,4 +12,6 @@ public interface YogaEventListener {
 
   void onNodeMeasure(YogaNode node);
 
+  void onNodeLayout(YogaNode node, boolean performLayout);
+
 }
diff --git a/yoga/Yoga.cpp b/yoga/Yoga.cpp
index c46104be..6c739a06 100644
--- a/yoga/Yoga.cpp
+++ b/yoga/Yoga.cpp
@@ -3670,7 +3670,7 @@ bool YGLayoutNodeInternal(
     YGMarkerLayoutData& layoutMarkerData,
     void* const layoutContext) {
 #ifdef YG_ENABLE_EVENTS
-  Event::publish<Event::NodeLayout>(node);
+  Event::publish<Event::NodeLayout>(node, {performLayout, layoutContext});
 #endif
   YGLayout* layout = &node->getLayout();
 
diff --git a/yoga/event/event.h b/yoga/event/event.h
index bff8dbfd..9dcd73b6 100644
--- a/yoga/event/event.h
+++ b/yoga/event/event.h
@@ -82,5 +82,11 @@ struct Event::TypedData<Event::NodeMeasure> {
   void* layoutContext;
 };
 
+template <>
+struct Event::TypedData<Event::NodeLayout> {
+  bool performLayout;
+  void* layoutContext;
+};
+
 } // namespace yoga
 } // namespace facebook