Apple TV: Enable long presses on TV remote; dev menu on TV device; example code

Summary:
**Motivation**

Properly support long presses on the Apple TV remote, and also enable dev menu functionality on a real Apple TV device (shaking an Apple TV doesn't work 😄 )

**Test plan**

New example added to `RNTester`.
Closes https://github.com/facebook/react-native/pull/15221

Differential Revision: D5526463

Pulled By: javache

fbshipit-source-id: a61051e86bc82a9561eefc1704bed6b1f2617e05

RNTester/js/RNTesterList.ios.js

@@ -336,6 +336,11 @@ const APIExamples: Array<RNTesterExample> = [
     module: require('./TransformExample'),
     supportsTVOS: true,
   },
+  {
+    key: 'TVEventHandlerExample',
+    module: require('./TVEventHandlerExample'),
+    supportsTVOS: true,
+  },
   {
     key: 'VibrationExample',
     module: require('./VibrationExample'),

RNTester/js/TVEventHandlerExample.js

@@ -0,0 +1,97 @@
+/**
+ * Copyright (c) 2017-present, Facebook, Inc.
+ * All rights reserved.
+ *
+ * This source code is licensed under the BSD-style license found in the
+ * LICENSE file in the root directory of this source tree. An additional grant
+ * of patent rights can be found in the PATENTS file in the same directory.
+ *
+ * @flow
+ * @providesModule TVEventHandlerExample
+ */
+'use strict';
+
+var React = require('react');
+var ReactNative = require('react-native');
+
+var {
+  Platform,
+  StyleSheet,
+  View,
+  Text,
+  TouchableOpacity,
+  TVEventHandler,
+} = ReactNative;
+
+exports.framework = 'React';
+exports.title = 'TVEventHandler example';
+exports.description = 'iOS alerts and action sheets';
+exports.examples = [{
+  title: 'TVEventHandler',
+  render() {return <TVEventHandlerView/>;}
+}];
+
+class TVEventHandlerView extends React.Component {
+  state: {
+    lastEventType: string
+  }
+
+  constructor(props) {
+    super(props);
+    this.state = {
+      lastEventType: ''
+    };
+  }
+
+  _tvEventHandler: any;
+
+  _enableTVEventHandler() {
+    this._tvEventHandler = new TVEventHandler();
+    this._tvEventHandler.enable(this, function(cmp, evt) {
+      cmp.setState({
+        lastEventType: evt.eventType
+      })
+    });
+  }
+
+  _disableTVEventHandler() {
+    if (this._tvEventHandler) {
+      this._tvEventHandler.disable();
+      delete this._tvEventHandler;
+    }
+  }
+
+  componentDidMount() {
+    this._enableTVEventHandler();
+  }
+
+  componentWillUnmount() {
+    this._disableTVEventHandler();
+  }
+
+  render() {
+
+    if (Platform.isTVOS) {
+      return (
+        <View>
+          <TouchableOpacity onPress={() => {}}>
+          <Text>
+            This example enables an instance of TVEventHandler to show the last event detected from the Apple TV Siri remote or from a keyboard.
+          </Text>
+          </TouchableOpacity>
+          <Text style={{color: 'blue'}}>
+            {this.state.lastEventType}
+          </Text>
+        </View>
+      );
+    } else {
+      return (
+        <View>
+          <Text>
+            This example is intended to be run on Apple TV.
+          </Text>
+        </View>
+      );
+    }
+  }
+}

React/Base/RCTTVRemoteHandler.m

@@ -22,6 +22,8 @@
 #import "RCTView.h"
 #import "UIView+React.h"
 
+#import "RCTDevMenu.h"
+
 @implementation RCTTVRemoteHandler {
   NSMutableArray<UIGestureRecognizer *> *_tvRemoteGestureRecognizers;
 }
@@ -60,7 +62,15 @@
     // Right
     [self addTapGestureRecognizerWithSelector:@selector(swipedRight:)
                                     pressType:UIPressTypeRightArrow];
-
+    
+    // Recognizers for long button presses
+    // We don't intercept long menu press -- that's used by the system to go to the home screen
+        
+    [self addLongPressGestureRecognizerWithSelector:@selector(longPlayPausePressed:)
+                                          pressType:UIPressTypePlayPause];
+    
+    [self addLongPressGestureRecognizerWithSelector:@selector(longSelectPressed:)
+                                          pressType:UIPressTypeSelect];
 
     // Recognizers for Apple TV remote trackpad swipes
 
@@ -100,9 +110,19 @@
   [self sendAppleTVEvent:@"select" toView:r.view];
 }
 
-- (void)longPress:(UIGestureRecognizer *)r
+- (void)longPlayPausePressed:(UIGestureRecognizer *)r
 {
-  [self sendAppleTVEvent:@"longPress" toView:r.view];
+  [self sendAppleTVEvent:@"longPlayPause" toView:r.view];
+
+  // If shake to show is enabled on device, use long play/pause event to show dev menu
+#if RCT_DEV
+  [[NSNotificationCenter defaultCenter] postNotificationName:RCTShowDevMenuNotification object:nil];
+#endif
+}
+
+- (void)longSelectPressed:(UIGestureRecognizer *)r
+{
+  [self sendAppleTVEvent:@"longSelect" toView:r.view];
 }
 
 - (void)swipedUp:(UIGestureRecognizer *)r
@@ -127,6 +147,14 @@
 
 #pragma mark -
 
+- (void)addLongPressGestureRecognizerWithSelector:(nonnull SEL)selector pressType:(UIPressType)pressType
+{
+  UILongPressGestureRecognizer *recognizer = [[UILongPressGestureRecognizer alloc] initWithTarget:self action:selector];
+  recognizer.allowedPressTypes = @[@(pressType)];
+  
+  [_tvRemoteGestureRecognizers addObject:recognizer];
+}
+
 - (void)addTapGestureRecognizerWithSelector:(nonnull SEL)selector pressType:(UIPressType)pressType
 {
   UITapGestureRecognizer *recognizer = [[UITapGestureRecognizer alloc] initWithTarget:self action:selector];

React/DevSupport/RCTDevMenu.h

@@ -12,6 +12,13 @@
 #import <React/RCTBridge.h>
 #import <React/RCTBridgeModule.h>
 
+#if RCT_DEV
+
+RCT_EXTERN NSString *const RCTShowDevMenuNotification;
+
+#endif
+
+
 @class RCTDevMenuItem;
 
 /**

React/DevSupport/RCTDevMenu.m

@@ -16,7 +16,7 @@
 
 #if RCT_DEV
 
-static NSString *const RCTShowDevMenuNotification = @"RCTShowDevMenuNotification";
+NSString *const RCTShowDevMenuNotification = @"RCTShowDevMenuNotification";
 
 @implementation UIWindow (RCTDevMenu)
 

docs/BuildingForAppleTV.md

@@ -83,6 +83,7 @@ class Game2048 extends React.Component {
   }
 
 ```
+- *Dev Menu support*: On the simulator, cmd-D will bring up the developer menu, just like on iOS.  To bring it up on a real Apple TV device, make a long press on the play/pause button on the remote.  (Please do not shake the Apple TV device, that will not work :) )
 
 - *TV remote animations*: `RCTTVView` native code implements Apple-recommended parallax animations to help guide the eye as the user navigates through views.  The animations can be disabled or adjusted with new optional view properties.