Migrate EventDispatcher interface to Kotlin (#48445)

Summary:
Pull Request resolved: #48445

# Changelog:
[Internal] -

As in the title.

Differential Revision: D67760373

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/uimanager/events/BlackHoleEventDispatcher.kt

@@ -14,10 +14,10 @@ import com.facebook.common.logging.FLog
  * expect an EventDispatcher when the instance doesn't exist.
  */
 public class BlackHoleEventDispatcher private constructor() : EventDispatcher {
-  public override fun dispatchEvent(event: Event<*>) {
+  public override fun dispatchEvent(event: Event<*>?) {
     FLog.d(
         "BlackHoleEventDispatcher",
-        "Trying to emit event to JS, but the React instance isn't ready. Event: ${event.eventName}")
+        "Trying to emit event to JS, but the React instance isn't ready. Event: ${event?.eventName ?: "null"}")
   }
 
   public override fun dispatchAllEvents(): Unit = Unit

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/uimanager/events/EventDispatcher.kt

@@ -0,0 +1,40 @@
+/*
+ * 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.
+ */
+
+package com.facebook.react.uimanager.events
+
+import com.facebook.react.uimanager.common.UIManagerType
+
+public interface EventDispatcher {
+  /** Sends the given Event to JS, coalescing eligible events if JS is backed up. */
+  public fun dispatchEvent(event: Event<*>?)
+
+  public fun dispatchAllEvents()
+
+  /** Add a listener to this EventDispatcher. */
+  public fun addListener(listener: EventDispatcherListener)
+
+  /** Remove a listener from this EventDispatcher. */
+  public fun removeListener(listener: EventDispatcherListener)
+
+  public fun addBatchEventDispatchedListener(listener: BatchEventDispatchedListener)
+
+  public fun removeBatchEventDispatchedListener(listener: BatchEventDispatchedListener)
+
+  @Deprecated("Use the modern version with RCTModernEventEmitter")
+  @Suppress("DEPRECATION")
+  public fun registerEventEmitter(@UIManagerType uiManagerType: Int, eventEmitter: RCTEventEmitter)
+
+  public fun registerEventEmitter(
+      @UIManagerType uiManagerType: Int,
+      eventEmitter: RCTModernEventEmitter
+  )
+
+  public fun unregisterEventEmitter(@UIManagerType uiManagerType: Int)
+
+  public fun onCatalystInstanceDestroyed()
+}

packages/react-native/ReactAndroid/src/main/java/com/facebook/react/uimanager/events/EventDispatcherImpl.java

@@ -9,6 +9,7 @@
 
 import android.util.LongSparseArray;
 import android.view.Choreographer;
+import androidx.annotation.Nullable;
 import com.facebook.infer.annotation.Assertions;
 import com.facebook.infer.annotation.Nullsafe;
 import com.facebook.react.bridge.LifecycleEventListener;
@@ -111,7 +112,7 @@ public EventDispatcherImpl(ReactApplicationContext reactContext) {
   }
 
   /** Sends the given Event to JS, coalescing eligible events if JS is backed up. */
-  public void dispatchEvent(Event event) {
+  public void dispatchEvent(@Nullable Event event) {
     Assertions.assertCondition(event.isInitialized(), "Dispatched event hasn't been initialized");
 
     for (EventDispatcherListener listener : mListeners) {

packages/react-native/ReactAndroid/src/test/java/com/facebook/react/RootViewTest.kt

@@ -39,9 +39,14 @@ import org.junit.runner.RunWith
 import org.mockito.ArgumentCaptor
 import org.mockito.ArgumentMatchers
 import org.mockito.MockedStatic
-import org.mockito.Mockito
-import org.mockito.Mockito.*
-import org.mockito.Mockito.`when` as whenever
+import org.mockito.Mockito.mockStatic
+import org.mockito.kotlin.mock
+import org.mockito.kotlin.reset
+import org.mockito.kotlin.spy
+import org.mockito.kotlin.times
+import org.mockito.kotlin.verify
+import org.mockito.kotlin.verifyNoMoreInteractions
+import org.mockito.kotlin.whenever
 import org.robolectric.Robolectric
 import org.robolectric.RobolectricTestRunner
 import org.robolectric.RuntimeEnvironment
@@ -59,20 +64,20 @@ class RootViewTest {
   fun setUp() {
     ReactNativeFeatureFlagsForTests.setUp()
 
-    arguments = Mockito.mockStatic(Arguments::class.java)
+    arguments = mockStatic(Arguments::class.java)
     arguments.`when`<WritableArray> { Arguments.createArray() }.thenAnswer { JavaOnlyArray() }
     arguments.`when`<WritableMap> { Arguments.createMap() }.thenAnswer { JavaOnlyMap() }
 
     val ts = SystemClock.uptimeMillis()
-    systemClock = Mockito.mockStatic(SystemClock::class.java)
+    systemClock = mockStatic(SystemClock::class.java)
     systemClock.`when`<Long> { SystemClock.uptimeMillis() }.thenReturn(ts)
 
     catalystInstanceMock = ReactTestHelper.createMockCatalystInstance()
     reactContext = spy(BridgeReactContext(RuntimeEnvironment.getApplication()))
     reactContext.initializeWithInstance(catalystInstanceMock)
 
     DisplayMetricsHolder.initDisplayMetricsIfNotInitialized(reactContext)
-    val uiManagerModuleMock = mock(UIManagerModule::class.java)
+    val uiManagerModuleMock: UIManagerModule = mock()
     whenever(catalystInstanceMock.getNativeModule(UIManagerModule::class.java))
         .thenReturn(uiManagerModuleMock)
   }
@@ -85,11 +90,11 @@ class RootViewTest {
 
   @Test
   fun testTouchEmitter() {
-    val instanceManager = mock(ReactInstanceManager::class.java)
+    val instanceManager: ReactInstanceManager = mock()
     whenever(instanceManager.currentReactContext).thenReturn(reactContext)
-    val uiManager = mock(UIManagerModule::class.java)
-    val eventDispatcher = mock(EventDispatcher::class.java)
-    val eventEmitterModuleMock = mock(RCTEventEmitter::class.java)
+    val uiManager: UIManagerModule = mock()
+    val eventDispatcher: EventDispatcher = mock()
+    val eventEmitterModuleMock: RCTEventEmitter = mock()
     whenever(catalystInstanceMock.getNativeModule(UIManagerModule::class.java))
         .thenReturn(uiManager)
     whenever(uiManager.eventDispatcher).thenReturn(eventDispatcher)
@@ -186,7 +191,7 @@ class RootViewTest {
 
   @Test
   fun testRemountApplication() {
-    val instanceManager = mock(ReactInstanceManager::class.java)
+    val instanceManager: ReactInstanceManager = mock()
     val rootView = ReactRootView(reactContext)
     rootView.startReactApplication(instanceManager, "")
     rootView.unmountReactApplication()
@@ -195,7 +200,7 @@ class RootViewTest {
 
   @Test
   fun testCheckForKeyboardEvents() {
-    val instanceManager = mock(ReactInstanceManager::class.java)
+    val instanceManager: ReactInstanceManager = mock()
     val activity = Robolectric.buildActivity(Activity::class.java).create().get()
     whenever(instanceManager.currentReactContext).thenReturn(reactContext)
     val rootView: ReactRootView =

packages/react-native/ReactAndroid/src/test/java/com/facebook/react/uimanager/JSPointerDispatcherTest.kt

@@ -22,9 +22,9 @@ import org.junit.Before
 import org.junit.Test
 import org.junit.runner.RunWith
 import org.mockito.ArgumentMatcher
-import org.mockito.Mockito.argThat
-import org.mockito.Mockito.mock
-import org.mockito.Mockito.verify
+import org.mockito.kotlin.argThat
+import org.mockito.kotlin.mock
+import org.mockito.kotlin.verify
 import org.robolectric.RobolectricTestRunner
 import org.robolectric.RuntimeEnvironment
 
@@ -75,7 +75,7 @@ class JSPointerDispatcherTest {
     val ev =
         createMotionEvent(
             MotionEvent.ACTION_DOWN, childRect.centerX().toFloat(), childRect.centerY().toFloat())
-    val mockDispatcher: EventDispatcher = mock(EventDispatcher::class.java)
+    val mockDispatcher: EventDispatcher = mock()
     pointerDispatcher.handleMotionEvent(ev, mockDispatcher, false)
     verify(mockDispatcher).dispatchEvent(argThat(EventWithName(PointerEventHelper.POINTER_DOWN)))
   }

packages/react-native/ReactAndroid/src/test/java/com/facebook/testutils/fakes/FakeEventDispatcher.kt

@@ -24,7 +24,7 @@ class FakeEventDispatcher : EventDispatcher {
     return recordedDispatchedEvents
   }
 
-  override fun dispatchEvent(event: Event<*>) {
+  override fun dispatchEvent(event: Event<*>?) {
     recordedDispatchedEvents.add(event)
   }