From 1736be58119f2fa0125d792b741ce841a30c9a33 Mon Sep 17 00:00:00 2001
From: Emily Janzer <emily.janzer@oculus.com>
Date: Thu, 30 Aug 2018 09:26:21 -0700
Subject: [PATCH] Add onTextLayout to TextProps

Summary: Splitting this into a separate diff for OSS

Reviewed By: yungsters

Differential Revision: D9551085

fbshipit-source-id: 8ca08351c6b89cd0011aab3c47ef6cc28b763450
---
 Libraries/Text/TextProps.js       |  3 ++-
 Libraries/Types/CoreEventTypes.js | 15 +++++++++++++++
 2 files changed, 17 insertions(+), 1 deletion(-)

diff --git a/Libraries/Text/TextProps.js b/Libraries/Text/TextProps.js
index 7426b5ab5..289424a7e 100644
--- a/Libraries/Text/TextProps.js
+++ b/Libraries/Text/TextProps.js
@@ -10,7 +10,7 @@
 
 'use strict';
 
-import type {LayoutEvent, PressEvent} from 'CoreEventTypes';
+import type {LayoutEvent, PressEvent, TextLayoutEvent} from 'CoreEventTypes';
 import type React from 'React';
 import type {DangerouslyImpreciseStyleProp} from 'StyleSheet';
 import type {
@@ -48,6 +48,7 @@ export type TextProps = $ReadOnly<{
   onResponderTerminate?: ?Function,
   onResponderTerminationRequest?: ?Function,
   onStartShouldSetResponder?: ?Function,
+  onTextLayout?: ?(event: TextLayoutEvent) => mixed,
   pressRetentionOffset?: ?PressRetentionOffset,
   selectable?: ?boolean,
   style?: ?DangerouslyImpreciseStyleProp,
diff --git a/Libraries/Types/CoreEventTypes.js b/Libraries/Types/CoreEventTypes.js
index 58a0cc5ed..17e6de6f1 100644
--- a/Libraries/Types/CoreEventTypes.js
+++ b/Libraries/Types/CoreEventTypes.js
@@ -36,12 +36,27 @@ export type Layout = $ReadOnly<{|
   height: number,
 |}>;
 
+export type TextLayout = $ReadOnly<{|
+  ...Layout,
+  ascender: number,
+  capHeight: number,
+  descender: number,
+  text: string,
+  xHeight: number,
+|}>;
+
 export type LayoutEvent = SyntheticEvent<
   $ReadOnly<{|
     layout: Layout,
   |}>,
 >;
 
+export type TextLayoutEvent = SyntheticEvent<
+  $ReadOnly<{|
+    lines: Array<TextLayout>,
+  |}>,
+>;
+
 export type PressEvent = SyntheticEvent<
   $ReadOnly<{|
     changedTouches: $ReadOnlyArray<$PropertyType<PressEvent, 'nativeEvent'>>,