From 267a9b55bfde8372a1da8c02706eb86d73f2b099 Mon Sep 17 00:00:00 2001
From: Nicolas Gallagher <nicolasgallagher@gmail.com>
Date: Mon, 22 Feb 2016 16:40:18 -0800
Subject: [PATCH] [add] inject ResponderEventPlugin

---
 .../injectResponderEventPlugin.js             | 92 +++++++++++++++++++
 src/index.js                                  |  2 +
 2 files changed, 94 insertions(+)
 create mode 100644 src/apis/PanResponder/injectResponderEventPlugin.js

diff --git a/src/apis/PanResponder/injectResponderEventPlugin.js b/src/apis/PanResponder/injectResponderEventPlugin.js
new file mode 100644
index 00000000..e464abe5
--- /dev/null
+++ b/src/apis/PanResponder/injectResponderEventPlugin.js
@@ -0,0 +1,92 @@
+// based on https://github.com/facebook/react/pull/4303/files
+
+import EventConstants from 'react/lib/EventConstants'
+import EventPluginRegistry from 'react/lib/EventPluginRegistry'
+import ResponderEventPlugin from 'react/lib/ResponderEventPlugin'
+import ResponderTouchHistoryStore from 'react/lib/ResponderTouchHistoryStore'
+
+const {
+  topMouseDown,
+  topMouseMove,
+  topMouseUp,
+  topScroll,
+  topSelectionChange,
+  topTouchCancel,
+  topTouchEnd,
+  topTouchMove,
+  topTouchStart
+} = EventConstants.topLevelTypes
+
+const endDependencies = [ topMouseUp, topTouchCancel, topTouchEnd ]
+const moveDependencies = [ topMouseMove, topTouchMove ]
+const startDependencies = [ topMouseDown, topTouchStart ]
+
+/**
+ * Setup ResponderEventPlugin dependencies
+ */
+ResponderEventPlugin.eventTypes.responderMove.dependencies = moveDependencies
+ResponderEventPlugin.eventTypes.responderEnd.dependencies = endDependencies
+ResponderEventPlugin.eventTypes.responderStart.dependencies = startDependencies
+ResponderEventPlugin.eventTypes.responderRelease.dependencies = []
+ResponderEventPlugin.eventTypes.responderTerminationRequest.dependencies = []
+ResponderEventPlugin.eventTypes.responderGrant.dependencies = []
+ResponderEventPlugin.eventTypes.responderReject.dependencies = []
+ResponderEventPlugin.eventTypes.responderTerminate.dependencies = []
+ResponderEventPlugin.eventTypes.moveShouldSetResponder.dependencies = moveDependencies
+ResponderEventPlugin.eventTypes.selectionChangeShouldSetResponder.dependencies = [ topSelectionChange ]
+ResponderEventPlugin.eventTypes.scrollShouldSetResponder.dependencies = [ topScroll ]
+ResponderEventPlugin.eventTypes.startShouldSetResponder.dependencies = startDependencies
+
+// Mobile Safari re-uses touch objects, so we copy the properties we want and normalize the identifier
+const normalizeTouches = (touches = []) => Array.prototype.slice.call(touches).map((touch) => {
+  const identifier = touch.identifier > 20 ? (touch.identifier % 20) : touch.identifier
+
+  return {
+    clientX: touch.clientX,
+    clientY: touch.clientY,
+    force: touch.force,
+    identifier: identifier,
+    pageX: touch.pageX,
+    pageY: touch.pageY,
+    radiusX: touch.radiusX,
+    radiusY: touch.radiusY,
+    rotationAngle: touch.rotationAngle,
+    screenX: touch.screenX,
+    screenY: touch.screenY,
+    target: touch.target
+  }
+})
+
+const normalizeNativeEvent = (nativeEvent) => {
+  const changedTouches = normalizeTouches(nativeEvent.changedTouches)
+  const touches = normalizeTouches(nativeEvent.touches)
+
+  const event = {
+    changedTouches,
+    pageX: nativeEvent.pageX,
+    pageY: nativeEvent.pageY,
+    target: nativeEvent.target,
+    // normalize the timestamp
+    // https://stackoverflow.com/questions/26177087/ios-8-mobile-safari-wrong-timestamp-on-touch-events
+    timestamp: Date.now(),
+    touches
+  }
+
+  if (changedTouches[0]) {
+    event.identifier = changedTouches[0].identifier
+    event.pageX = changedTouches[0].pageX
+    event.pageY = changedTouches[0].pageY
+  }
+
+  return event
+}
+
+const originalRecordTouchTrack = ResponderTouchHistoryStore.recordTouchTrack
+
+ResponderTouchHistoryStore.recordTouchTrack = (topLevelType, nativeEvent) => {
+  originalRecordTouchTrack.call(ResponderTouchHistoryStore, topLevelType, normalizeNativeEvent(nativeEvent))
+}
+
+EventPluginRegistry.injectEventPluginsByName({
+  ResponderEventPlugin
+})
diff --git a/src/index.js b/src/index.js
index 978aa62b..b1ad7a65 100644
--- a/src/index.js
+++ b/src/index.js
@@ -2,6 +2,8 @@ import React from 'react'
 import ReactDOM from 'react-dom'
 import ReactDOMServer from 'react-dom/server'
 
+import './apis/PanResponder/injectResponderEventPlugin'
+
 // apis
 import Animated from './apis/Animated'
 import AppRegistry from './apis/AppRegistry'