Support sendAccessibilityEvent in Fabric

Summary: Support for `sendAccessibilityEvent` in the FabricUIManager.

Reviewed By: shergin

Differential Revision: D17142507

fbshipit-source-id: 5c131d7caa1e4189fd41ecfb558d0027394b6a15

ReactAndroid/src/main/java/com/facebook/react/bridge/UIManager.java

@@ -53,4 +53,12 @@ public interface UIManager extends JSIModule, PerformanceCounter {
    * @param props {@link ReadableMap} props that should be immediately updated in view
    */
   void synchronouslyUpdateViewOnUIThread(int reactTag, ReadableMap props);
+
+  /**
+   * Dispatch an accessibility event to a view asynchronously.
+   *
+   * @param reactTag
+   * @param eventType
+   */
+  void sendAccessibilityEvent(int reactTag, int eventType);
 }

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

@@ -51,6 +51,7 @@ import com.facebook.react.fabric.mounting.mountitems.InsertMountItem;
 import com.facebook.react.fabric.mounting.mountitems.MountItem;
 import com.facebook.react.fabric.mounting.mountitems.PreAllocateViewMountItem;
 import com.facebook.react.fabric.mounting.mountitems.RemoveMountItem;
+import com.facebook.react.fabric.mounting.mountitems.SendAccessibilityEvent;
 import com.facebook.react.fabric.mounting.mountitems.UpdateEventEmitterMountItem;
 import com.facebook.react.fabric.mounting.mountitems.UpdateLayoutMountItem;
 import com.facebook.react.fabric.mounting.mountitems.UpdateLocalDataMountItem;
@@ -566,6 +567,13 @@ public class FabricUIManager implements UIManager, LifecycleEventListener {
     }
   }
 
+  @Override
+  public void sendAccessibilityEvent(int reactTag, int eventType) {
+    synchronized (mMountItemsLock) {
+      mMountItems.add(new SendAccessibilityEvent(reactTag, eventType));
+    }
+  }
+
   /**
    * Set the JS responder for the view associated with the tags received as a parameter.
    *

ReactAndroid/src/main/java/com/facebook/react/fabric/mounting/MountingManager.java

@@ -143,6 +143,20 @@ public class MountingManager {
     viewState.mViewManager.receiveCommand(viewState.mView, commandId, commandArgs);
   }
 
+  public void sendAccessibilityEvent(int reactTag, int eventType) {
+    ViewState viewState = getViewState(reactTag);
+
+    if (viewState.mViewManager == null) {
+      throw new IllegalStateException("Unable to find viewState manager for tag " + reactTag);
+    }
+
+    if (viewState.mView == null) {
+      throw new IllegalStateException("Unable to find viewState view for tag " + reactTag);
+    }
+
+    viewState.mView.sendAccessibilityEvent(eventType);
+  }
+
   @SuppressWarnings("unchecked") // prevents unchecked conversion warn of the <ViewGroup> type
   private static ViewGroupManager<ViewGroup> getViewGroupManager(ViewState viewState) {
     if (viewState.mViewManager == null) {

ReactAndroid/src/main/java/com/facebook/react/fabric/mounting/mountitems/SendAccessibilityEvent.java

@@ -0,0 +1,30 @@
+/**
+ * Copyright (c) 2014-present, Facebook, Inc.
+ *
+ * <p>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.fabric.mounting.mountitems;
+
+import com.facebook.react.fabric.mounting.MountingManager;
+
+public class SendAccessibilityEvent implements MountItem {
+
+  private final int mReactTag;
+  private final int mEventType;
+
+  public SendAccessibilityEvent(int reactTag, int eventType) {
+    mReactTag = reactTag;
+    mEventType = eventType;
+  }
+
+  @Override
+  public void execute(MountingManager mountingManager) {
+    mountingManager.sendAccessibilityEvent(mReactTag, mEventType);
+  }
+
+  @Override
+  public String toString() {
+    return "SendAccessibilityEvent [" + mReactTag + "] " + mEventType;
+  }
+}

ReactAndroid/src/main/java/com/facebook/react/uimanager/UIManagerModule.java

@@ -796,7 +796,14 @@ public class UIManagerModule extends ReactContextBaseJavaModule
 
   @ReactMethod
   public void sendAccessibilityEvent(int tag, int eventType) {
-    mUIImplementation.sendAccessibilityEvent(tag, eventType);
+    int uiManagerType = ViewUtil.getUIManagerType(tag);
+    if (uiManagerType == FABRIC) {
+      UIManager fabricUIManager =
+          UIManagerHelper.getUIManager(getReactApplicationContext(), uiManagerType);
+      fabricUIManager.sendAccessibilityEvent(tag, eventType);
+    } else {
+      mUIImplementation.sendAccessibilityEvent(tag, eventType);
+    }
   }
 
   /**