Add keyboard-observing notifications

React/Base/RCTKeyboardObserver.h

@@ -0,0 +1,16 @@
+/**
+ * Copyright (c) 2015-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.
+ */
+
+#import <Foundation/Foundation.h>
+
+#import "RCTBridgeModule.h"
+
+@interface RCTKeyboardObserver : NSObject <RCTBridgeModule>
+
+@end

React/Base/RCTKeyboardObserver.m

@@ -0,0 +1,87 @@
+/**
+ * Copyright (c) 2015-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.
+ */
+
+#import "RCTKeyboardObserver.h"
+
+#import "RCTEventDispatcher.h"
+
+static NSDictionary *RCTParseKeyboardNotification(NSNotification *notification);
+
+@implementation RCTKeyboardObserver
+
+@synthesize bridge = _bridge;
+
+RCT_EXPORT_MODULE()
+
+- (instancetype)init
+{
+  if ((self = [super init])) {
+    NSNotificationCenter *nc = [NSNotificationCenter defaultCenter];
+
+#define ADD_KEYBOARD_HANDLER(NAME, SELECTOR) \
+    [nc addObserver:self selector:@selector(SELECTOR:) name:NAME object:nil]
+
+    ADD_KEYBOARD_HANDLER(UIKeyboardWillShowNotification, keyboardWillShow);
+    ADD_KEYBOARD_HANDLER(UIKeyboardDidShowNotification, keyboardDidShow);
+    ADD_KEYBOARD_HANDLER(UIKeyboardWillHideNotification, keyboardWillHide);
+    ADD_KEYBOARD_HANDLER(UIKeyboardDidHideNotification, keyboardDidHide);
+    ADD_KEYBOARD_HANDLER(UIKeyboardWillChangeFrameNotification, keyboardWillChangeFrame);
+    ADD_KEYBOARD_HANDLER(UIKeyboardDidChangeFrameNotification, keyboardDidChangeFrame);
+
+#undef ADD_KEYBOARD_HANDLER
+  }
+
+  return self;
+}
+
+- (void)dealloc
+{
+  [[NSNotificationCenter defaultCenter] removeObserver:self];
+}
+
+#define IMPLEMENT_KEYBOARD_HANDLER(EVENT) \
+- (void)EVENT:(NSNotification *)notification \
+{ \
+  [_bridge.eventDispatcher \
+    sendDeviceEventWithName:@#EVENT \
+    body:RCTParseKeyboardNotification(notification)]; \
+}
+
+IMPLEMENT_KEYBOARD_HANDLER(keyboardWillShow)
+IMPLEMENT_KEYBOARD_HANDLER(keyboardDidShow)
+IMPLEMENT_KEYBOARD_HANDLER(keyboardWillHide)
+IMPLEMENT_KEYBOARD_HANDLER(keyboardDidHide)
+IMPLEMENT_KEYBOARD_HANDLER(keyboardWillChangeFrame)
+IMPLEMENT_KEYBOARD_HANDLER(keyboardDidChangeFrame)
+
+@end
+
+static NSDictionary *RCTRectDictionaryValue(CGRect rect)
+{
+  return @{
+    @"screenX": @(rect.origin.x),
+    @"screenY": @(rect.origin.y),
+    @"width": @(rect.size.width),
+    @"height": @(rect.size.height),
+  };
+}
+
+static NSDictionary *RCTParseKeyboardNotification(NSNotification *notification)
+{
+  NSDictionary *userInfo = notification.userInfo;
+  CGRect beginFrame = [userInfo[UIKeyboardFrameBeginUserInfoKey] CGRectValue];
+  CGRect endFrame = [userInfo[UIKeyboardFrameEndUserInfoKey] CGRectValue];
+  NSTimeInterval duration = [userInfo[UIKeyboardAnimationDurationUserInfoKey] doubleValue];
+
+  return @{
+    @"startCoordinates": RCTRectDictionaryValue(beginFrame),
+    @"endCoordinates": RCTRectDictionaryValue(endFrame),
+    @"duration": @(duration * 1000.0), // ms
+  };
+}