Wire up event handler bindings

Reviewed By: mdvacca

Differential Revision: D8048409

fbshipit-source-id: 5706130607302b4be2287cc303def7c2fb398bc8

ReactAndroid/src/main/java/com/facebook/react/fabric/FabricUIManager.java

@@ -71,6 +71,10 @@ public class FabricUIManager implements UIManager {
     mFabricReconciler = new FabricReconciler(mUIViewOperationQueue);
   }
 
+  public void registerEventHandler(long eventHandlerPointer) {
+    // TODO: Release this event handler at some point.
+  }
+
   /** Creates a new {@link ReactShadowNode} */
   @Nullable
   public ReactShadowNode createNode(

ReactAndroid/src/main/java/com/facebook/react/fabric/jsc/FabricJSCBinding.java

@@ -12,6 +12,7 @@ import com.facebook.proguard.annotations.DoNotStrip;
 import com.facebook.react.bridge.JavaScriptContextHolder;
 import com.facebook.react.fabric.FabricBinding;
 import com.facebook.react.fabric.FabricUIManager;
+import com.facebook.react.bridge.NativeMap;
 import com.facebook.soloader.SoLoader;
 
 @DoNotStrip
@@ -31,6 +32,16 @@ public class FabricJSCBinding implements FabricBinding {
 
   private native void releaseEventTarget(long jsContextNativePointer, long eventTargetPointer);
 
+  private native void releaseEventHandler(long jsContextNativePointer, long eventHandlerPointer);
+
+  private native void dispatchEventToTarget(
+    long jsContextNativePointer,
+    long eventHandlerPointer,
+    long eventTargetPointer,
+    String type,
+    NativeMap payload
+  );
+
   private native void installFabric(long jsContextNativePointer, Object fabricModule);
 
   public FabricJSCBinding() {

ReactAndroid/src/main/java/com/facebook/react/fabric/jsc/jni/FabricJSCBinding.cpp

@@ -7,7 +7,6 @@
 
 #include "FabricJSCBinding.h"
 #include <fb/fbjni.h>
-#include <react/jni/ReadableNativeMap.h>
 #include <jschelpers/JavaScriptCore.h>
 #include <jschelpers/Unicode.h>
 
@@ -81,6 +80,15 @@ local_ref<ReadableNativeMap::jhybridobject> JSValueToReadableMapViaJSON(JSContex
   return ReadableNativeMap::newObjectCxxArgs(std::move(dynamicValue));
 }
 
+JSValueRef ReadableMapToJSValueViaJSON(JSContextRef ctx, NativeMap *map) {
+  folly::dynamic dynamicValue = map->consume();
+  auto json = folly::toJson(dynamicValue);
+  JSStringRef jsonRef = JSC_JSStringCreateWithUTF8CString(ctx, json.c_str());
+  auto value = JSC_JSValueMakeFromJSONString(ctx, jsonRef);
+  JSC_JSStringRelease(ctx, jsonRef);
+  return value;
+}
+
 JSValueRef createNode(JSContextRef ctx, JSObjectRef function, JSObjectRef thisObject, size_t argumentCount, const JSValueRef arguments[], JSValueRef *exception) {
   FabricJSCUIManager *managerWrapper = (FabricJSCUIManager *)JSC_JSObjectGetPrivate(useCustomJSC, function);
   alias_ref<jobject> manager = managerWrapper->fabricUiManager;
@@ -231,6 +239,21 @@ JSValueRef completeRoot(JSContextRef ctx, JSObjectRef function, JSObjectRef this
   return JSC_JSValueMakeUndefined(ctx);
 }
 
+JSValueRef registerEventHandler(JSContextRef ctx, JSObjectRef function, JSObjectRef thisObject, size_t argumentCount, const JSValueRef arguments[], JSValueRef *exception) {
+  FabricJSCUIManager *managerWrapper = (FabricJSCUIManager *)JSC_JSObjectGetPrivate(useCustomJSC, function);
+  alias_ref<jobject> manager = managerWrapper->fabricUiManager;
+
+  static auto registerEventHandler =
+    jni::findClassStatic("com/facebook/react/fabric/FabricUIManager")
+      ->getMethod<void(jlong)>("registerEventHandler");
+
+  auto eventHandler = arguments[0];
+  JSC_JSValueProtect(ctx, eventHandler);
+  registerEventHandler(manager, (jlong)eventHandler);
+
+  return JSC_JSValueMakeUndefined(ctx);
+}
+
 void finalizeJNIObject(JSObjectRef object) {
   // Release whatever global ref object we're storing here.
   jobject globalRef = (jobject)JSC_JSObjectGetPrivate(useCustomJSC, object);
@@ -291,6 +314,47 @@ void FabricJSCBinding::releaseEventTarget(
   JSC_JSValueUnprotect(context, value);
 }
 
+void FabricJSCBinding::releaseEventHandler(
+  jlong jsContextNativePointer,
+  jlong eventHandlerPointer
+) {
+  JSContextRef context = (JSContextRef)jsContextNativePointer;
+  JSValueRef value = (JSValueRef)((void *)eventHandlerPointer);
+  // Release this function.
+  JSC_JSValueUnprotect(context, value);
+}
+
+void FabricJSCBinding::dispatchEventToTarget(
+  jlong jsContextNativePointer,
+  jlong eventHandlerPointer,
+  jlong eventTargetPointer,
+  std::string type,
+  NativeMap *payloadMap
+) {
+  JSContextRef context = (JSContextRef)jsContextNativePointer;
+  JSObjectRef eventHandler = (JSObjectRef)((void *)eventHandlerPointer);
+  JSObjectRef eventTarget = (JSObjectRef)((void *)eventTargetPointer);
+
+  JSObjectRef thisArg = (JSObjectRef)JSC_JSValueMakeUndefined(context);
+  JSStringRef typeStr = JSC_JSStringCreateWithUTF8CString(context, type.c_str());
+  JSValueRef typeRef = JSC_JSValueMakeString(context, typeStr);
+  JSC_JSStringRelease(context, typeStr);
+  JSValueRef payloadRef = ReadableMapToJSValueViaJSON(context, payloadMap);
+  JSValueRef args[] = {eventTarget, typeRef, payloadRef};
+  JSValueRef exn;
+  JSValueRef result = JSC_JSObjectCallAsFunction(
+    context,
+    eventHandler,
+    thisArg,
+    3,
+    args,
+    &exn
+  );
+  if (!result) {
+    // TODO: Handle error in exn
+  }
+}
+
 void FabricJSCBinding::installFabric(jlong jsContextNativePointer,
     jni::alias_ref<jobject> fabricModule) {
   JSContextRef context = (JSContextRef)jsContextNativePointer;
@@ -308,11 +372,14 @@ void FabricJSCBinding::installFabric(jlong jsContextNativePointer,
   addFabricMethod(context, fabricModule, classRef, module, "cloneNodeWithNewChildren", cloneNodeWithNewChildren);
   addFabricMethod(context, fabricModule, classRef, module, "cloneNodeWithNewProps", cloneNodeWithNewProps);
   addFabricMethod(context, fabricModule, classRef, module, "cloneNodeWithNewChildrenAndProps", cloneNodeWithNewChildrenAndProps);
+
   addFabricMethod(context, fabricModule, classRef, module, "appendChild", appendChild);
   addFabricMethod(context, fabricModule, classRef, module, "createChildSet", createChildSet);
   addFabricMethod(context, fabricModule, classRef, module, "appendChildToSet", appendChildToSet);
   addFabricMethod(context, fabricModule, classRef, module, "completeRoot", completeRoot);
 
+  addFabricMethod(context, fabricModule, classRef, module, "registerEventHandler", registerEventHandler);
+
   JSC_JSClassRelease(useCustomJSC, classRef);
 
   JSObjectRef globalObject = JSC_JSContextGetGlobalObject(context);
@@ -325,6 +392,10 @@ void FabricJSCBinding::registerNatives() {
   registerHybrid({
     makeNativeMethod("initHybrid", FabricJSCBinding::initHybrid),
     makeNativeMethod("installFabric", FabricJSCBinding::installFabric),
+    makeNativeMethod("createEventTarget", FabricJSCBinding::createEventTarget),
+    makeNativeMethod("releaseEventTarget", FabricJSCBinding::releaseEventTarget),
+    makeNativeMethod("releaseEventHandler", FabricJSCBinding::releaseEventHandler),
+    makeNativeMethod("dispatchEventToTarget", FabricJSCBinding::dispatchEventToTarget),
   });
 }
 

ReactAndroid/src/main/java/com/facebook/react/fabric/jsc/jni/FabricJSCBinding.h

@@ -9,6 +9,7 @@
 
 #include <memory>
 #include <fb/fbjni.h>
+#include <react/jni/ReadableNativeMap.h>
 
 namespace facebook {
 namespace react {
@@ -30,6 +31,16 @@ private:
 
   void releaseEventTarget(jlong jsContextNativePointer, jlong eventTargetPointer);
 
+  void releaseEventHandler(jlong jsContextNativePointer, jlong eventHandlerPointer);
+
+  void dispatchEventToTarget(
+    jlong jsContextNativePointer,
+    jlong eventHandlerPointer,
+    jlong eventTargetPointer,
+    std::string type,
+    NativeMap *payload
+  );
+
   void installFabric(jlong jsContextNativePointer, jni::alias_ref<jobject> fabricModule);
 
 };