Add onFocus and onBlur to Pressable. (#30405)

Summary:
Starting to upstream keyboard-related features from React Native Windows - this is the Android implementation.
Exposing onFocus and onBlur callbacks on Pressable; they're already declared for View in ViewPropTypes.js, which Pressable wraps.

Registering event listeners in ReactViewManager to listen for native focus events.
## Changelog

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[Android] [Added] - Add onFocus/onBlur for Pressable on Android.

Pull Request resolved: #30405

Test Plan:
Tested on v63-stable, since building master on Windows is now broken. Screenshots from RNTester running on the emulator:
![image](https://user-images.githubusercontent.com/12816515/99320373-59777e80-2820-11eb-91a8-704fff4aa13d.png)
![image](https://user-images.githubusercontent.com/12816515/99320412-6f853f00-2820-11eb-98f2-f9cd29e8aa0d.png)

Reviewed By: mdvacca

Differential Revision: D25444566

Pulled By: appden

fbshipit-source-id: ce0efd3e3b199a508df0ba1ce484b4de17471432

Author: Igor Klemenski

Libraries/Components/Pressable/Pressable.js

@@ -25,7 +25,12 @@ import type {
 import {PressabilityDebugView} from '../../Pressability/PressabilityDebug';
 import usePressability from '../../Pressability/usePressability';
 import {normalizeRect, type RectOrSize} from '../../StyleSheet/Rect';
-import type {LayoutEvent, PressEvent} from '../../Types/CoreEventTypes';
+import type {
+  LayoutEvent,
+  PressEvent,
+  BlurEvent,
+  FocusEvent,
+} from '../../Types/CoreEventTypes';
 import View from '../View/View';
 
 type ViewStyleProp = $ElementType<React.ElementConfig<typeof View>, 'style'>;
@@ -105,6 +110,16 @@ type Props = $ReadOnly<{|
    */
   onPressOut?: ?(event: PressEvent) => void,
 
+  /**
+   * Called after the element loses focus.
+   */
+  onBlur?: ?(event: BlurEvent) => mixed,
+
+  /**
+   * Called after the element is focused.
+   */
+  onFocus?: ?(event: FocusEvent) => mixed,
+
   /**
    * Either view styles or a function that receives a boolean reflecting whether
    * the component is currently pressed and returns view styles.
@@ -154,6 +169,8 @@ function Pressable(props: Props, forwardedRef): React.Node {
     onPress,
     onPressIn,
     onPressOut,
+    onBlur,
+    onFocus,
     pressRetentionOffset,
     style,
     testOnly_pressed,
@@ -207,6 +224,8 @@ function Pressable(props: Props, forwardedRef): React.Node {
           onPressOut(event);
         }
       },
+      onBlur,
+      onFocus,
     }),
     [
       android_disableSound,
@@ -218,6 +237,8 @@ function Pressable(props: Props, forwardedRef): React.Node {
       onPress,
       onPressIn,
       onPressOut,
+      onBlur,
+      onFocus,
       pressRetentionOffset,
       setPressed,
       unstable_pressDelay,

Libraries/Components/View/View.js

@@ -11,10 +11,14 @@
 'use strict';
 
 import type {ViewProps} from './ViewPropTypes';
-
+import type {BlurEvent, FocusEvent} from '../../Types/CoreEventTypes';
 const React = require('react');
 import ViewNativeComponent from './ViewNativeComponent';
 const TextAncestor = require('../../Text/TextAncestor');
+const TextInputState = require('../TextInput/TextInputState');
+import type {HostComponent} from '../../Renderer/shims/ReactNativeTypes';
+const setAndForwardRef = require('../../Utilities/setAndForwardRef');
+const {useRef} = React;
 
 export type Props = ViewProps;
 
@@ -29,9 +33,37 @@ const View: React.AbstractComponent<
   ViewProps,
   React.ElementRef<typeof ViewNativeComponent>,
 > = React.forwardRef((props: ViewProps, forwardedRef) => {
+  const viewRef = useRef<null | React.ElementRef<HostComponent<mixed>>>(null);
+
+  const _setNativeRef = setAndForwardRef({
+    getForwardedRef: () => forwardedRef,
+    setLocalRef: ref => {
+      viewRef.current = ref;
+    },
+  });
+
+  const _onBlur = (event: BlurEvent) => {
+    TextInputState.blurInput(viewRef.current);
+    if (props.onBlur) {
+      props.onBlur(event);
+    }
+  };
+
+  const _onFocus = (event: FocusEvent) => {
+    TextInputState.focusInput(viewRef.current);
+    if (props.onFocus) {
+      props.onFocus(event);
+    }
+  };
+
   return (
     <TextAncestor.Provider value={false}>
-      <ViewNativeComponent {...props} ref={forwardedRef} />
+      <ViewNativeComponent
+        {...props}
+        onBlur={_onBlur}
+        onFocus={_onFocus}
+        ref={_setNativeRef}
+      />
     </TextAncestor.Provider>
   );
 });

ReactAndroid/src/main/java/com/facebook/react/views/common/BUCK

@@ -1,4 +1,4 @@
-load("//tools/build_defs/oss:rn_defs.bzl", "react_native_dep", "rn_android_library")
+load("//tools/build_defs/oss:rn_defs.bzl", "react_native_dep", "react_native_target", "rn_android_library")
 
 rn_android_library(
     name = "common",
@@ -18,5 +18,8 @@ rn_android_library(
         "PUBLIC",
     ],
     deps = [
+        react_native_target("java/com/facebook/react/uimanager:uimanager"),
+        react_native_target("java/com/facebook/react/uimanager/annotations:annotations"),
+        react_native_target("java/com/facebook/react/bridge:bridge"),
     ],
 )

ReactAndroid/src/main/java/com/facebook/react/views/textinput/ReactTextInputBlurEvent.java renamed to ReactAndroid/src/main/java/com/facebook/react/views/common/ReactViewBlurEvent.java

@@ -5,19 +5,19 @@
  * LICENSE file in the root directory of this source tree.
  */
 
-package com.facebook.react.views.textinput;
+package com.facebook.react.views.common;
 
 import com.facebook.react.bridge.Arguments;
 import com.facebook.react.bridge.WritableMap;
 import com.facebook.react.uimanager.events.Event;
 import com.facebook.react.uimanager.events.RCTEventEmitter;
 
-/** Event emitted by EditText native view when it loses focus. */
-/* package */ class ReactTextInputBlurEvent extends Event<ReactTextInputBlurEvent> {
+/** Event emitted by a native view when it loses focus. */
+public class ReactViewBlurEvent extends Event<ReactViewBlurEvent> {
 
   private static final String EVENT_NAME = "topBlur";
 
-  public ReactTextInputBlurEvent(int viewId) {
+  public ReactViewBlurEvent(int viewId) {
     super(viewId);
   }
 

ReactAndroid/src/main/java/com/facebook/react/views/textinput/ReactTextInputFocusEvent.java renamed to ReactAndroid/src/main/java/com/facebook/react/views/common/ReactViewFocusEvent.java

@@ -5,19 +5,19 @@
  * LICENSE file in the root directory of this source tree.
  */
 
-package com.facebook.react.views.textinput;
+package com.facebook.react.views.common;
 
 import com.facebook.react.bridge.Arguments;
 import com.facebook.react.bridge.WritableMap;
 import com.facebook.react.uimanager.events.Event;
 import com.facebook.react.uimanager.events.RCTEventEmitter;
 
-/** Event emitted by EditText native view when it receives focus. */
-/* package */ class ReactTextInputFocusEvent extends Event<ReactTextInputFocusEvent> {
+/** Event emitted by a native view when it receives focus. */
+public class ReactViewFocusEvent extends Event<ReactViewFocusEvent> {
 
   private static final String EVENT_NAME = "topFocus";
 
-  public ReactTextInputFocusEvent(int viewId) {
+  public ReactViewFocusEvent(int viewId) {
     super(viewId);
   }
 

ReactAndroid/src/main/java/com/facebook/react/views/textinput/BUCK

@@ -21,6 +21,7 @@ rn_android_library(
         react_native_target("java/com/facebook/react/modules/core:core"),
         react_native_target("java/com/facebook/react/uimanager:uimanager"),
         react_native_target("java/com/facebook/react/uimanager/annotations:annotations"),
+        react_native_target("java/com/facebook/react/views/common:common"),
         react_native_target("java/com/facebook/react/views/imagehelper:imagehelper"),
         react_native_target("java/com/facebook/react/views/scroll:scroll"),
         react_native_target("java/com/facebook/react/views/text:text"),

ReactAndroid/src/main/java/com/facebook/react/views/textinput/ReactTextInputManager.java

@@ -59,6 +59,8 @@
 import com.facebook.react.uimanager.annotations.ReactProp;
 import com.facebook.react.uimanager.annotations.ReactPropGroup;
 import com.facebook.react.uimanager.events.EventDispatcher;
+import com.facebook.react.views.common.ReactViewBlurEvent;
+import com.facebook.react.views.common.ReactViewFocusEvent;
 import com.facebook.react.views.imagehelper.ResourceDrawableIdHelper;
 import com.facebook.react.views.scroll.ScrollEvent;
 import com.facebook.react.views.scroll.ScrollEventType;
@@ -974,9 +976,9 @@ protected void addEventEmitters(
           public void onFocusChange(View v, boolean hasFocus) {
             EventDispatcher eventDispatcher = getEventDispatcher(reactContext, editText);
             if (hasFocus) {
-              eventDispatcher.dispatchEvent(new ReactTextInputFocusEvent(editText.getId()));
+              eventDispatcher.dispatchEvent(new ReactViewFocusEvent(editText.getId()));
             } else {
-              eventDispatcher.dispatchEvent(new ReactTextInputBlurEvent(editText.getId()));
+              eventDispatcher.dispatchEvent(new ReactViewBlurEvent(editText.getId()));
 
               eventDispatcher.dispatchEvent(
                   new ReactTextInputEndEditingEvent(

ReactAndroid/src/main/java/com/facebook/react/views/view/ReactViewManager.java

@@ -29,6 +29,8 @@
 import com.facebook.react.uimanager.annotations.ReactProp;
 import com.facebook.react.uimanager.annotations.ReactPropGroup;
 import com.facebook.react.uimanager.events.EventDispatcher;
+import com.facebook.react.views.common.ReactViewBlurEvent;
+import com.facebook.react.views.common.ReactViewFocusEvent;
 import com.facebook.yoga.YogaConstants;
 import java.util.Locale;
 import java.util.Map;
@@ -234,8 +236,7 @@ public void setFocusable(final ReactViewGroup view, boolean focusable) {
             @Override
             public void onClick(View v) {
               final EventDispatcher mEventDispatcher =
-                  UIManagerHelper.getEventDispatcherForReactTag(
-                      (ReactContext) view.getContext(), view.getId());
+                  getEventDispatcher((ReactContext) view.getContext(), view);
               if (mEventDispatcher == null) {
                 return;
               }
@@ -254,6 +255,27 @@ public void onClick(View v) {
     }
   }
 
+  private static EventDispatcher getEventDispatcher(
+      ReactContext reactContext, ReactViewGroup view) {
+    return UIManagerHelper.getEventDispatcherForReactTag(reactContext, view.getId());
+  }
+
+  @Override
+  protected void addEventEmitters(
+      final ThemedReactContext reactContext, final ReactViewGroup view) {
+    view.setOnFocusChangeListener(
+        new View.OnFocusChangeListener() {
+          public void onFocusChange(View v, boolean hasFocus) {
+            EventDispatcher eventDispatcher = getEventDispatcher(reactContext, view);
+            if (hasFocus) {
+              eventDispatcher.dispatchEvent(new ReactViewFocusEvent(view.getId()));
+            } else {
+              eventDispatcher.dispatchEvent(new ReactViewBlurEvent(view.getId()));
+            }
+          }
+        });
+  }
+
   @ReactProp(name = ViewProps.OVERFLOW)
   public void setOverflow(ReactViewGroup view, String overflow) {
     view.setOverflow(overflow);

packages/rn-tester/js/examples/Pressable/PressableExample.js

@@ -250,6 +250,32 @@ function PressableDisabled() {
   );
 }
 
+function PressableFocusBlurEvents() {
+  const [lastEvent, setLastEvent] = useState('');
+
+  return (
+    <View testID="pressable_hit_slop">
+      <View style={[styles.row, styles.centered]}>
+        <Pressable
+          onFocus={() => {
+            console.log('Focused!');
+            setLastEvent('Received focus event');
+          }}
+          onBlur={() => {
+            console.log('Blurred!');
+            setLastEvent('Received blur event');
+          }}
+          testID="pressable_focus_blur_button">
+          <Text style={styles.text}>Use keyboard to move focus to me</Text>
+        </Pressable>
+      </View>
+      <View style={styles.logBox}>
+        <Text>{lastEvent}</Text>
+      </View>
+    </View>
+  );
+}
+
 const styles = StyleSheet.create({
   row: {
     justifyContent: 'center',
@@ -478,4 +504,12 @@ exports.examples = [
       return <PressableDisabled />;
     },
   },
+  {
+    title: 'Pressable onFocus/onBlur',
+    description: ('<Pressable> components can receive focus/blur events.': string),
+    platform: 'android',
+    render: function(): React.Node {
+      return <PressableFocusBlurEvents />;
+    },
+  },
 ];