From e78ce713cbaf6a3b80746b751c9b9abe70cc132a Mon Sep 17 00:00:00 2001
From: Nick <nsipplswezey@gmail.com>
Date: Thu, 25 May 2017 16:52:10 -0700
Subject: [PATCH] [fix] TextInput selection for Blink on Android

Close #492
---
 .../TextInput/__tests__/index-test.js         | 19 +++++++++++++++++++
 src/components/TextInput/index.js             |  9 ++++++++-
 2 files changed, 27 insertions(+), 1 deletion(-)

diff --git a/src/components/TextInput/__tests__/index-test.js b/src/components/TextInput/__tests__/index-test.js
index 117ca959..bdddda16 100644
--- a/src/components/TextInput/__tests__/index-test.js
+++ b/src/components/TextInput/__tests__/index-test.js
@@ -199,4 +199,23 @@ describe('components/TextInput', () => {
     const input = findNativeInput(shallow(<TextInput value={value} />));
     expect(input.prop('value')).toEqual(value);
   });
+
+  describe('prop "selection"', () => {
+    test('set cursor location', () => {
+      const cursorLocation = { start: 3, end: 3 };
+
+      const inputDefaultSelection = findNativeInput(mount(<TextInput defaultValue="12345" />));
+      const inputCustomSelection = findNativeInput(
+        mount(<TextInput defaultValue="12345" selection={cursorLocation} />)
+      );
+
+      // default selection is 0
+      expect(inputDefaultSelection.node.selectionStart).toEqual(0);
+      expect(inputDefaultSelection.node.selectionEnd).toEqual(0);
+
+      // custom selection sets cursor at custom position
+      expect(inputCustomSelection.node.selectionStart).toEqual(cursorLocation.start);
+      expect(inputCustomSelection.node.selectionEnd).toEqual(cursorLocation.end);
+    });
+  });
 });
diff --git a/src/components/TextInput/index.js b/src/components/TextInput/index.js
index 366fa233..c6ff90e5 100644
--- a/src/components/TextInput/index.js
+++ b/src/components/TextInput/index.js
@@ -4,6 +4,7 @@
 
 import applyLayout from '../../modules/applyLayout';
 import applyNativeMethods from '../../modules/applyNativeMethods';
+import { canUseDOM } from 'fbjs/lib/ExecutionEnvironment';
 import { Component } from 'react';
 import NativeMethodsMixin from '../../modules/NativeMethodsMixin';
 import createDOMElement from '../../modules/createDOMElement';
@@ -15,6 +16,7 @@ import TextInputState from './TextInputState';
 import ViewPropTypes from '../View/ViewPropTypes';
 import { bool, func, number, oneOf, shape, string } from 'prop-types';
 
+const isAndroid = canUseDOM && /Android/i.test(navigator && navigator.userAgent);
 const emptyObject = {};
 
 /**
@@ -48,7 +50,12 @@ const setSelection = (node, selection) => {
   try {
     if (isSelectionStale(node, selection)) {
       const { start, end } = selection;
-      node.setSelectionRange(start, end || start);
+      // workaround for Blink on Android: see https://github.com/text-mask/text-mask/issues/300
+      if (isAndroid) {
+        setTimeout(() => node.setSelectionRange(start, end || start), 10);
+      } else {
+        node.setSelectionRange(start, end || start);
+      }
     }
   } catch (e) {}
 };