ReactEventEmitter -> Kotlin (#48464)

Summary: Pull Request resolved: #48464 # Changelog: [Internal] - As in the title. Reviewed By: christophpurrer Differential Revision: D67791375 fbshipit-source-id: eca1f999b43c405ce48aa5fa3518ec08363f5836
facebook · Jan 4, 2025 · a6e6f5e · a6e6f5e
1 parent 0769206
commit a6e6f5e
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Showing 4 changed files with 144 additions and 166 deletions.
diff --git a/packages/react-native/ReactAndroid/api/ReactAndroid.api b/packages/react-native/ReactAndroid/api/ReactAndroid.api
@@ -5780,6 +5780,13 @@ public final class com/facebook/react/uimanager/events/TouchEventType$Companion
 	public final fun getJSEventName (Lcom/facebook/react/uimanager/events/TouchEventType;)Ljava/lang/String;
 }
 
+public final class com/facebook/react/uimanager/events/TouchesHelper {
+	public static final field INSTANCE Lcom/facebook/react/uimanager/events/TouchesHelper;
+	public static final field TARGET_KEY Ljava/lang/String;
+	public static final fun sendTouchEvent (Lcom/facebook/react/uimanager/events/RCTModernEventEmitter;Lcom/facebook/react/uimanager/events/TouchEvent;)V
+	public static final fun sendTouchesLegacy (Lcom/facebook/react/uimanager/events/RCTEventEmitter;Lcom/facebook/react/uimanager/events/TouchEvent;)V
+}
+
 public final class com/facebook/react/uimanager/layoutanimation/InterpolatorType : java/lang/Enum {
 	public static final field Companion Lcom/facebook/react/uimanager/layoutanimation/InterpolatorType$Companion;
 	public static final field EASE_IN Lcom/facebook/react/uimanager/layoutanimation/InterpolatorType;

diff --git a/...ive/ReactAndroid/src/main/java/com/facebook/react/uimanager/events/ReactEventEmitter.java b/...ive/ReactAndroid/src/main/java/com/facebook/react/uimanager/events/ReactEventEmitter.java
diff --git a/...ative/ReactAndroid/src/main/java/com/facebook/react/uimanager/events/ReactEventEmitter.kt b/...ative/ReactAndroid/src/main/java/com/facebook/react/uimanager/events/ReactEventEmitter.kt
@@ -0,0 +1,136 @@
+/*
+ * Copyright (c) Meta Platforms, Inc. and affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+// RCTEventEmitter usage throughout:
+@file:Suppress("DEPRECATION")
+
+package com.facebook.react.uimanager.events
+
+import com.facebook.react.bridge.ReactApplicationContext
+import com.facebook.react.bridge.ReactNoCrashSoftException
+import com.facebook.react.bridge.ReactSoftExceptionLogger.logSoftException
+import com.facebook.react.bridge.WritableArray
+import com.facebook.react.bridge.WritableMap
+import com.facebook.react.uimanager.common.UIManagerType
+import com.facebook.react.uimanager.common.ViewUtil.getUIManagerType
+
+internal class ReactEventEmitter(private val reactContext: ReactApplicationContext) :
+    RCTModernEventEmitter {
+  /** Corresponds to [com.facebook.react.fabric.events.FabricEventEmitter] */
+  private var fabricEventEmitter: RCTModernEventEmitter? = null
+
+  /** Corresponds to (Paper) EventEmitter, which is a JS interface */
+  private var defaultEventEmitter: RCTEventEmitter? = null
+
+  fun register(@UIManagerType uiManagerType: Int, eventEmitter: RCTModernEventEmitter?) {
+    check(uiManagerType == UIManagerType.FABRIC)
+    fabricEventEmitter = eventEmitter
+  }
+
+  fun register(@UIManagerType uiManagerType: Int, eventEmitter: RCTEventEmitter?) {
+    check(uiManagerType == UIManagerType.DEFAULT)
+    defaultEventEmitter = eventEmitter
+  }
+
+  fun unregister(@UIManagerType uiManagerType: Int) {
+    if (uiManagerType == UIManagerType.DEFAULT) {
+      defaultEventEmitter = null
+    } else {
+      fabricEventEmitter = null
+    }
+  }
+
+  @Deprecated("Please use RCTModernEventEmitter")
+  override fun receiveEvent(targetReactTag: Int, eventName: String, event: WritableMap?) {
+    receiveEvent(-1, targetReactTag, eventName, event)
+  }
+
+  override fun receiveEvent(
+      surfaceId: Int,
+      targetTag: Int,
+      eventName: String,
+      event: WritableMap?
+  ) {
+    // We assume this event can't be coalesced. `customCoalesceKey` has no meaning in Fabric.
+    receiveEvent(surfaceId, targetTag, eventName, false, 0, event, EventCategoryDef.UNSPECIFIED)
+  }
+
+  @Deprecated("Please use RCTModernEventEmitter")
+  override fun receiveTouches(
+      eventName: String,
+      touches: WritableArray,
+      changedIndices: WritableArray
+  ) {
+    /*
+     * This method should be unused by default processing pipeline, but leaving it here to make sure
+     * that any custom code using it in legacy renderer is compatible
+     */
+    check(touches.size() > 0)
+
+    val reactTag = touches.getMap(0)?.getInt(TouchesHelper.TARGET_KEY) ?: 0
+    @UIManagerType val uiManagerType = getUIManagerType(reactTag)
+    if (uiManagerType == UIManagerType.DEFAULT) {
+      ensureDefaultEventEmitter()?.receiveTouches(eventName, touches, changedIndices)
+    }
+  }
+
+  @Deprecated("Please use RCTModernEventEmitter")
+  override fun receiveTouches(event: TouchEvent) {
+    @UIManagerType val uiManagerType = getUIManagerType(event.viewTag, event.surfaceId)
+    if (uiManagerType == UIManagerType.FABRIC) {
+      fabricEventEmitter?.let { TouchesHelper.sendTouchEvent(it, event) }
+    } else if (uiManagerType == UIManagerType.DEFAULT) {
+      ensureDefaultEventEmitter()?.let { TouchesHelper.sendTouchesLegacy(it, event) }
+    }
+  }
+
+  /**
+   * Get default/Paper event emitter. Callers should have verified that this is not an event for a
+   * View managed by Fabric
+   */
+  private fun ensureDefaultEventEmitter(): RCTEventEmitter? {
+    if (defaultEventEmitter == null) {
+      if (reactContext.hasActiveReactInstance()) {
+        defaultEventEmitter = reactContext.getJSModule(RCTEventEmitter::class.java)
+      } else {
+        logSoftException(
+            TAG,
+            ReactNoCrashSoftException(
+                "Cannot get RCTEventEmitter from Context, no active Catalyst instance!"))
+      }
+    }
+    return defaultEventEmitter
+  }
+
+  override fun receiveEvent(
+      surfaceId: Int,
+      targetReactTag: Int,
+      eventName: String,
+      canCoalesceEvent: Boolean,
+      customCoalesceKey: Int,
+      event: WritableMap?,
+      @EventCategoryDef category: Int
+  ) {
+    @UIManagerType val uiManagerType = getUIManagerType(targetReactTag, surfaceId)
+    if (uiManagerType == UIManagerType.FABRIC) {
+      fabricEventEmitter?.receiveEvent(
+          surfaceId,
+          targetReactTag,
+          eventName,
+          canCoalesceEvent,
+          customCoalesceKey,
+          event,
+          category)
+    } else if (uiManagerType == UIManagerType.DEFAULT) {
+      ensureDefaultEventEmitter()?.receiveEvent(targetReactTag, eventName, event)
+    }
+  }
+
+  companion object {
+    private const val TAG = "ReactEventEmitter"
+  }
+}
diff --git a/...ct-native/ReactAndroid/src/main/java/com/facebook/react/uimanager/events/TouchesHelper.kt b/...ct-native/ReactAndroid/src/main/java/com/facebook/react/uimanager/events/TouchesHelper.kt
@@ -15,7 +15,7 @@ import com.facebook.react.uimanager.events.TouchEventType.Companion.getJSEventNa
 import com.facebook.systrace.Systrace
 
 /** Class responsible for generating catalyst touch events based on android [MotionEvent]. */
-internal object TouchesHelper {
+public object TouchesHelper {
   @JvmField @Deprecated("Not used in New Architecture") public val TARGET_KEY: String = "target"
 
   private const val TARGET_SURFACE_KEY = "targetSurface"