From de98e0b232509d5f40c135d540a70e415272ff85 Mon Sep 17 00:00:00 2001
From: Florian Dold <florian.dold@gmail.com>
Date: Wed, 3 May 2017 15:35:00 +0200
Subject: node_modules

---
 node_modules/react-dom/lib/TapEventPlugin.js | 115 +++++++++++++++++++++++++++
 1 file changed, 115 insertions(+)
 create mode 100644 node_modules/react-dom/lib/TapEventPlugin.js

(limited to 'node_modules/react-dom/lib/TapEventPlugin.js')

diff --git a/node_modules/react-dom/lib/TapEventPlugin.js b/node_modules/react-dom/lib/TapEventPlugin.js
new file mode 100644
index 000000000..463fe9851
--- /dev/null
+++ b/node_modules/react-dom/lib/TapEventPlugin.js
@@ -0,0 +1,115 @@
+/**
+ * Copyright 2013-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.
+ *
+ * 
+ */
+
+'use strict';
+
+var EventPluginUtils = require('./EventPluginUtils');
+var EventPropagators = require('./EventPropagators');
+var SyntheticUIEvent = require('./SyntheticUIEvent');
+var TouchEventUtils = require('fbjs/lib/TouchEventUtils');
+var ViewportMetrics = require('./ViewportMetrics');
+
+var isStartish = EventPluginUtils.isStartish;
+var isEndish = EventPluginUtils.isEndish;
+
+/**
+ * We are extending the Flow 'Touch' declaration to enable using bracket
+ * notation to access properties.
+ * Without this adjustment Flow throws
+ * "Indexable signature not found in Touch".
+ * See https://github.com/facebook/flow/issues/1323
+ */
+
+
+/**
+ * Number of pixels that are tolerated in between a `touchStart` and `touchEnd`
+ * in order to still be considered a 'tap' event.
+ */
+var tapMoveThreshold = 10;
+var startCoords = { x: 0, y: 0 };
+
+var Axis = {
+  x: { page: 'pageX', client: 'clientX', envScroll: 'currentPageScrollLeft' },
+  y: { page: 'pageY', client: 'clientY', envScroll: 'currentPageScrollTop' }
+};
+
+function getAxisCoordOfEvent(axis, nativeEvent) {
+  var singleTouch = TouchEventUtils.extractSingleTouch(nativeEvent);
+  if (singleTouch) {
+    return singleTouch[axis.page];
+  }
+  return axis.page in nativeEvent ? nativeEvent[axis.page] : nativeEvent[axis.client] + ViewportMetrics[axis.envScroll];
+}
+
+function getDistance(coords, nativeEvent) {
+  var pageX = getAxisCoordOfEvent(Axis.x, nativeEvent);
+  var pageY = getAxisCoordOfEvent(Axis.y, nativeEvent);
+  return Math.pow(Math.pow(pageX - coords.x, 2) + Math.pow(pageY - coords.y, 2), 0.5);
+}
+
+var touchEvents = ['topTouchStart', 'topTouchCancel', 'topTouchEnd', 'topTouchMove'];
+
+var dependencies = ['topMouseDown', 'topMouseMove', 'topMouseUp'].concat(touchEvents);
+
+var eventTypes = {
+  touchTap: {
+    phasedRegistrationNames: {
+      bubbled: 'onTouchTap',
+      captured: 'onTouchTapCapture'
+    },
+    dependencies: dependencies
+  }
+};
+
+var usedTouch = false;
+var usedTouchTime = 0;
+var TOUCH_DELAY = 1000;
+
+var TapEventPlugin = {
+
+  tapMoveThreshold: tapMoveThreshold,
+
+  eventTypes: eventTypes,
+
+  extractEvents: function (topLevelType, targetInst, nativeEvent, nativeEventTarget) {
+    if (!isStartish(topLevelType) && !isEndish(topLevelType)) {
+      return null;
+    }
+    // on ios, there is a delay after touch event and synthetic
+    // mouse events, so that user can perform double tap
+    // solution: ignore mouse events following touchevent within small timeframe
+    if (touchEvents.indexOf(topLevelType) !== -1) {
+      usedTouch = true;
+      usedTouchTime = Date.now();
+    } else {
+      if (usedTouch && Date.now() - usedTouchTime < TOUCH_DELAY) {
+        return null;
+      }
+    }
+    var event = null;
+    var distance = getDistance(startCoords, nativeEvent);
+    if (isEndish(topLevelType) && distance < tapMoveThreshold) {
+      event = SyntheticUIEvent.getPooled(eventTypes.touchTap, targetInst, nativeEvent, nativeEventTarget);
+    }
+    if (isStartish(topLevelType)) {
+      startCoords.x = getAxisCoordOfEvent(Axis.x, nativeEvent);
+      startCoords.y = getAxisCoordOfEvent(Axis.y, nativeEvent);
+    } else if (isEndish(topLevelType)) {
+      startCoords.x = 0;
+      startCoords.y = 0;
+    }
+    EventPropagators.accumulateTwoPhaseDispatches(event);
+    return event;
+  }
+
+};
+
+module.exports = TapEventPlugin;
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