RN: Implement sendAccessibilityEvent in RN Renderer that proxies between Fabric/non-Fabric (#20554)

* RN: Implement `sendAccessibilityEvent` on HostComponent

Implement `sendAccessibilityEvent` on HostComponent for Fabric and non-Fabric RN.

Currently the Fabric version is a noop and non-Fabric uses
AccessibilityInfo directly. The Fabric version will be updated once
native Fabric Android/iOS support this method in the native UIManager.

* Move methods out of HostComponent

* Properly type dispatchCommand and sendAccessibilityEvent handle arg

* Implement Fabric side of sendAccessibilityEvent

* Add tests: 1. Fabric->Fabric, 2. Paper->Fabric, 3. Fabric->Paper, 4. Paper->Paper

* Fix typo: ReactFaricEventTouch -> ReactFabricEventTouch

* fix flow types

* prettier

Author: JoshuaGross

Diff for: packages/react-native-renderer/src/ReactFabric.js

@@ -30,8 +30,11 @@ import {createPortal as createPortalImpl} from 'react-reconciler/src/ReactPortal
 import {setBatchingImplementation} from './legacy-events/ReactGenericBatching';
 import ReactVersion from 'shared/ReactVersion';
 
-// Module provided by RN:
-import {UIManager} from 'react-native/Libraries/ReactPrivate/ReactNativePrivateInterface';
+// Modules provided by RN:
+import {
+  UIManager,
+  legacySendAccessibilityEvent,
+} from 'react-native/Libraries/ReactPrivate/ReactNativePrivateInterface';
 
 import {getClosestInstanceFromNode} from './ReactFabricComponentTree';
 import {
@@ -169,6 +172,27 @@ function dispatchCommand(handle: any, command: string, args: Array<any>) {
   }
 }
 
+function sendAccessibilityEvent(handle: any, eventType: string) {
+  if (handle._nativeTag == null) {
+    if (__DEV__) {
+      console.error(
+        "sendAccessibilityEvent was called with a ref that isn't a " +
+          'native component. Use React.forwardRef to get access to the underlying native component',
+      );
+    }
+    return;
+  }
+
+  if (handle._internalInstanceHandle) {
+    nativeFabricUIManager.sendAccessibilityEvent(
+      handle._internalInstanceHandle.stateNode.node,
+      eventType,
+    );
+  } else {
+    legacySendAccessibilityEvent(handle._nativeTag, eventType);
+  }
+}
+
 function render(
   element: React$Element<any>,
   containerTag: any,
@@ -224,6 +248,7 @@ export {
   findHostInstance_DEPRECATED,
   findNodeHandle,
   dispatchCommand,
+  sendAccessibilityEvent,
   render,
   // Deprecated - this function is being renamed to stopSurface, use that instead.
   // TODO (T47576999): Delete this once it's no longer called from native code.

Diff for: packages/react-native-renderer/src/ReactNativeRenderer.js

@@ -32,8 +32,11 @@ import {
   batchedUpdates,
 } from './legacy-events/ReactGenericBatching';
 import ReactVersion from 'shared/ReactVersion';
-// Module provided by RN:
-import {UIManager} from 'react-native/Libraries/ReactPrivate/ReactNativePrivateInterface';
+// Modules provided by RN:
+import {
+  UIManager,
+  legacySendAccessibilityEvent,
+} from 'react-native/Libraries/ReactPrivate/ReactNativePrivateInterface';
 
 import {getClosestInstanceFromNode} from './ReactNativeComponentTree';
 import {
@@ -168,6 +171,27 @@ function dispatchCommand(handle: any, command: string, args: Array<any>) {
   }
 }
 
+function sendAccessibilityEvent(handle: any, eventType: string) {
+  if (handle._nativeTag == null) {
+    if (__DEV__) {
+      console.error(
+        "sendAccessibilityEvent was called with a ref that isn't a " +
+          'native component. Use React.forwardRef to get access to the underlying native component',
+      );
+    }
+    return;
+  }
+
+  if (handle._internalInstanceHandle) {
+    nativeFabricUIManager.sendAccessibilityEvent(
+      handle._internalInstanceHandle.stateNode.node,
+      eventType,
+    );
+  } else {
+    legacySendAccessibilityEvent(handle._nativeTag, eventType);
+  }
+}
+
 function render(
   element: React$Element<any>,
   containerTag: any,
@@ -238,6 +262,7 @@ export {
   findHostInstance_DEPRECATED,
   findNodeHandle,
   dispatchCommand,
+  sendAccessibilityEvent,
   render,
   unmountComponentAtNode,
   unmountComponentAtNodeAndRemoveContainer,

Diff for: packages/react-native-renderer/src/ReactNativeTypes.js

@@ -149,7 +149,15 @@ export type ReactNativeType = {
     componentOrHandle: any,
   ): ?ElementRef<HostComponent<mixed>>,
   findNodeHandle(componentOrHandle: any): ?number,
-  dispatchCommand(handle: any, command: string, args: Array<any>): void,
+  dispatchCommand(
+    handle: ElementRef<HostComponent<mixed>>,
+    command: string,
+    args: Array<any>,
+  ): void,
+  sendAccessibilityEvent(
+    handle: ElementRef<HostComponent<mixed>>,
+    eventType: string,
+  ): void,
   render(
     element: React$Element<any>,
     containerTag: any,
@@ -168,7 +176,15 @@ export type ReactFabricType = {
     componentOrHandle: any,
   ): ?ElementRef<HostComponent<mixed>>,
   findNodeHandle(componentOrHandle: any): ?number,
-  dispatchCommand(handle: any, command: string, args: Array<any>): void,
+  dispatchCommand(
+    handle: ElementRef<HostComponent<mixed>>,
+    command: string,
+    args: Array<any>,
+  ): void,
+  sendAccessibilityEvent(
+    handle: ElementRef<HostComponent<mixed>>,
+    eventType: string,
+  ): void,
   render(
     element: React$Element<any>,
     containerTag: any,
@@ -190,7 +206,7 @@ export type ReactNativeEventTarget = {
   ...
 };
 
-export type ReactFaricEventTouch = {
+export type ReactFabricEventTouch = {
   identifier: number,
   locationX: number,
   locationY: number,
@@ -204,10 +220,10 @@ export type ReactFaricEventTouch = {
   ...
 };
 
-export type ReactFaricEvent = {
-  touches: Array<ReactFaricEventTouch>,
-  changedTouches: Array<ReactFaricEventTouch>,
-  targetTouches: Array<ReactFaricEventTouch>,
+export type ReactFabricEvent = {
+  touches: Array<ReactFabricEventTouch>,
+  changedTouches: Array<ReactFabricEventTouch>,
+  targetTouches: Array<ReactFabricEventTouch>,
   target: number,
   ...
 };

Diff for: packages/react-native-renderer/src/__mocks__/react-native/Libraries/ReactPrivate/InitializeNativeFabricUIManager.js

@@ -122,6 +122,8 @@ const RCTFabricUIManager = {
 
   dispatchCommand: jest.fn(),
 
+  sendAccessibilityEvent: jest.fn(),
+
   registerEventHandler: jest.fn(function registerEventHandler(callback) {}),
 
   measure: jest.fn(function measure(node, callback) {

Diff for: packages/react-native-renderer/src/__mocks__/react-native/Libraries/ReactPrivate/ReactNativePrivateInterface.js

@@ -38,4 +38,7 @@ module.exports = {
   get flattenStyle() {
     return require('./flattenStyle');
   },
+  get legacySendAccessibilityEvent() {
+    return require('./legacySendAccessibilityEvent');
+  },
 };

Diff for: packages/react-native-renderer/src/__mocks__/react-native/Libraries/ReactPrivate/UIManager.js

@@ -88,6 +88,7 @@ const RCTUIManager = {
     });
   }),
   dispatchViewManagerCommand: jest.fn(),
+  sendAccessibilityEvent: jest.fn(),
   setJSResponder: jest.fn(),
   setChildren: jest.fn(function setChildren(parentTag, reactTags) {
     autoCreateRoot(parentTag);

Diff for: packages/react-native-renderer/src/__mocks__/react-native/Libraries/ReactPrivate/legacySendAccessibilityEvent.js

@@ -0,0 +1,10 @@
+/**
+ * Copyright (c) Facebook, Inc. and its affiliates.
+ *
+ * This source code is licensed under the MIT license found in the
+ * LICENSE file in the root directory of this source tree.
+ */
+
+'use strict';
+
+module.exports = jest.fn();

Diff for: packages/react-native-renderer/src/__tests__/ReactFabric-test.internal.js

@@ -24,6 +24,10 @@ const DISPATCH_COMMAND_REQUIRES_HOST_COMPONENT =
   "Warning: dispatchCommand was called with a ref that isn't a " +
   'native component. Use React.forwardRef to get access to the underlying native component';
 
+const SEND_ACCESSIBILITY_EVENT_REQUIRES_HOST_COMPONENT =
+  "sendAccessibilityEvent was called with a ref that isn't a " +
+  'native component. Use React.forwardRef to get access to the underlying native component';
+
 jest.mock('shared/ReactFeatureFlags', () =>
   require('shared/forks/ReactFeatureFlags.native-oss'),
 );
@@ -289,6 +293,64 @@ describe('ReactFabric', () => {
     expect(nativeFabricUIManager.dispatchCommand).not.toBeCalled();
   });
 
+  it('should call sendAccessibilityEvent for native refs', () => {
+    const View = createReactNativeComponentClass('RCTView', () => ({
+      validAttributes: {foo: true},
+      uiViewClassName: 'RCTView',
+    }));
+
+    nativeFabricUIManager.sendAccessibilityEvent.mockClear();
+
+    let viewRef;
+    ReactFabric.render(
+      <View
+        ref={ref => {
+          viewRef = ref;
+        }}
+      />,
+      11,
+    );
+
+    expect(nativeFabricUIManager.sendAccessibilityEvent).not.toBeCalled();
+    ReactFabric.sendAccessibilityEvent(viewRef, 'focus');
+    expect(nativeFabricUIManager.sendAccessibilityEvent).toHaveBeenCalledTimes(
+      1,
+    );
+    expect(nativeFabricUIManager.sendAccessibilityEvent).toHaveBeenCalledWith(
+      expect.any(Object),
+      'focus',
+    );
+  });
+
+  it('should warn and no-op if calling sendAccessibilityEvent on non native refs', () => {
+    class BasicClass extends React.Component {
+      render() {
+        return <React.Fragment />;
+      }
+    }
+
+    nativeFabricUIManager.sendAccessibilityEvent.mockReset();
+
+    let viewRef;
+    ReactFabric.render(
+      <BasicClass
+        ref={ref => {
+          viewRef = ref;
+        }}
+      />,
+      11,
+    );
+
+    expect(nativeFabricUIManager.sendAccessibilityEvent).not.toBeCalled();
+    expect(() => {
+      ReactFabric.sendAccessibilityEvent(viewRef, 'eventTypeName');
+    }).toErrorDev([SEND_ACCESSIBILITY_EVENT_REQUIRES_HOST_COMPONENT], {
+      withoutStack: true,
+    });
+
+    expect(nativeFabricUIManager.sendAccessibilityEvent).not.toBeCalled();
+  });
+
   it('should call FabricUIManager.measure on ref.measure', () => {
     const View = createReactNativeComponentClass('RCTView', () => ({
       validAttributes: {foo: true},

Diff for: packages/react-native-renderer/src/__tests__/ReactFabricAndNative-test.internal.js

@@ -15,13 +15,15 @@ let ReactFabric;
 let ReactNative;
 let UIManager;
 let createReactNativeComponentClass;
+let ReactNativePrivateInterface;
 
 describe('created with ReactFabric called with ReactNative', () => {
   beforeEach(() => {
     jest.resetModules();
     require('react-native/Libraries/ReactPrivate/InitializeNativeFabricUIManager');
     ReactNative = require('react-native-renderer');
     jest.resetModules();
+    ReactNativePrivateInterface = require('react-native/Libraries/ReactPrivate/ReactNativePrivateInterface');
     UIManager = require('react-native/Libraries/ReactPrivate/ReactNativePrivateInterface')
       .UIManager;
     jest.mock('shared/ReactFeatureFlags', () =>
@@ -92,6 +94,28 @@ describe('created with ReactFabric called with ReactNative', () => {
     ).toHaveBeenCalledWith(expect.any(Object), 'myCommand', [10, 20]);
     expect(UIManager.dispatchViewManagerCommand).not.toBeCalled();
   });
+
+  it('dispatches sendAccessibilityEvent on Fabric nodes with the RN renderer', () => {
+    nativeFabricUIManager.sendAccessibilityEvent.mockClear();
+    const View = createReactNativeComponentClass('RCTView', () => ({
+      validAttributes: {title: true},
+      uiViewClassName: 'RCTView',
+    }));
+
+    const ref = React.createRef();
+
+    ReactFabric.render(<View title="bar" ref={ref} />, 11);
+    expect(nativeFabricUIManager.sendAccessibilityEvent).not.toBeCalled();
+    ReactNative.sendAccessibilityEvent(ref.current, 'focus');
+    expect(nativeFabricUIManager.sendAccessibilityEvent).toHaveBeenCalledTimes(
+      1,
+    );
+    expect(nativeFabricUIManager.sendAccessibilityEvent).toHaveBeenCalledWith(
+      expect.any(Object),
+      'focus',
+    );
+    expect(UIManager.sendAccessibilityEvent).not.toBeCalled();
+  });
 });
 
 describe('created with ReactNative called with ReactFabric', () => {
@@ -171,4 +195,28 @@ describe('created with ReactNative called with ReactFabric', () => {
 
     expect(nativeFabricUIManager.dispatchCommand).not.toBeCalled();
   });
+
+  it('dispatches sendAccessibilityEvent on Paper nodes with the Fabric renderer', () => {
+    ReactNativePrivateInterface.legacySendAccessibilityEvent.mockReset();
+    const View = createReactNativeComponentClass('RCTView', () => ({
+      validAttributes: {title: true},
+      uiViewClassName: 'RCTView',
+    }));
+
+    const ref = React.createRef();
+
+    ReactNative.render(<View title="bar" ref={ref} />, 11);
+    expect(
+      ReactNativePrivateInterface.legacySendAccessibilityEvent,
+    ).not.toBeCalled();
+    ReactFabric.sendAccessibilityEvent(ref.current, 'focus');
+    expect(
+      ReactNativePrivateInterface.legacySendAccessibilityEvent,
+    ).toHaveBeenCalledTimes(1);
+    expect(
+      ReactNativePrivateInterface.legacySendAccessibilityEvent,
+    ).toHaveBeenCalledWith(expect.any(Number), 'focus');
+
+    expect(nativeFabricUIManager.sendAccessibilityEvent).not.toBeCalled();
+  });
 });