node_modules

1 files changed, 183 insertions, 0 deletions

diff --git a/node_modules/react-dom/lib/ResponderTouchHistoryStore.js b/node_modules/react-dom/lib/ResponderTouchHistoryStore.js
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+/**
+ * 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 _prodInvariant = require('./reactProdInvariant');
+
+var EventPluginUtils = require('./EventPluginUtils');
+
+var invariant = require('fbjs/lib/invariant');
+var warning = require('fbjs/lib/warning');
+
+var isEndish = EventPluginUtils.isEndish,
+    isMoveish = EventPluginUtils.isMoveish,
+    isStartish = EventPluginUtils.isStartish;
+
+/**
+ * Tracks the position and time of each active touch by `touch.identifier`. We
+ * should typically only see IDs in the range of 1-20 because IDs get recycled
+ * when touches end and start again.
+ */
+
+var MAX_TOUCH_BANK = 20;
+var touchBank = [];
+var touchHistory = {
+  touchBank: touchBank,
+  numberActiveTouches: 0,
+  // If there is only one active touch, we remember its location. This prevents
+  // us having to loop through all of the touches all the time in the most
+  // common case.
+  indexOfSingleActiveTouch: -1,
+  mostRecentTimeStamp: 0
+};
+
+function timestampForTouch(touch) {
+  // The legacy internal implementation provides "timeStamp", which has been
+  // renamed to "timestamp". Let both work for now while we iron it out
+  // TODO (evv): rename timeStamp to timestamp in internal code
+  return touch.timeStamp || touch.timestamp;
+}
+
+/**
+ * TODO: Instead of making gestures recompute filtered velocity, we could
+ * include a built in velocity computation that can be reused globally.
+ */
+function createTouchRecord(touch) {
+  return {
+    touchActive: true,
+    startPageX: touch.pageX,
+    startPageY: touch.pageY,
+    startTimeStamp: timestampForTouch(touch),
+    currentPageX: touch.pageX,
+    currentPageY: touch.pageY,
+    currentTimeStamp: timestampForTouch(touch),
+    previousPageX: touch.pageX,
+    previousPageY: touch.pageY,
+    previousTimeStamp: timestampForTouch(touch)
+  };
+}
+
+function resetTouchRecord(touchRecord, touch) {
+  touchRecord.touchActive = true;
+  touchRecord.startPageX = touch.pageX;
+  touchRecord.startPageY = touch.pageY;
+  touchRecord.startTimeStamp = timestampForTouch(touch);
+  touchRecord.currentPageX = touch.pageX;
+  touchRecord.currentPageY = touch.pageY;
+  touchRecord.currentTimeStamp = timestampForTouch(touch);
+  touchRecord.previousPageX = touch.pageX;
+  touchRecord.previousPageY = touch.pageY;
+  touchRecord.previousTimeStamp = timestampForTouch(touch);
+}
+
+function getTouchIdentifier(_ref) {
+  var identifier = _ref.identifier;
+
+  !(identifier != null) ? process.env.NODE_ENV !== 'production' ? invariant(false, 'Touch object is missing identifier.') : _prodInvariant('138') : void 0;
+  process.env.NODE_ENV !== 'production' ? warning(identifier <= MAX_TOUCH_BANK, 'Touch identifier %s is greater than maximum supported %s which causes ' + 'performance issues backfilling array locations for all of the indices.', identifier, MAX_TOUCH_BANK) : void 0;
+  return identifier;
+}
+
+function recordTouchStart(touch) {
+  var identifier = getTouchIdentifier(touch);
+  var touchRecord = touchBank[identifier];
+  if (touchRecord) {
+    resetTouchRecord(touchRecord, touch);
+  } else {
+    touchBank[identifier] = createTouchRecord(touch);
+  }
+  touchHistory.mostRecentTimeStamp = timestampForTouch(touch);
+}
+
+function recordTouchMove(touch) {
+  var touchRecord = touchBank[getTouchIdentifier(touch)];
+  if (touchRecord) {
+    touchRecord.touchActive = true;
+    touchRecord.previousPageX = touchRecord.currentPageX;
+    touchRecord.previousPageY = touchRecord.currentPageY;
+    touchRecord.previousTimeStamp = touchRecord.currentTimeStamp;
+    touchRecord.currentPageX = touch.pageX;
+    touchRecord.currentPageY = touch.pageY;
+    touchRecord.currentTimeStamp = timestampForTouch(touch);
+    touchHistory.mostRecentTimeStamp = timestampForTouch(touch);
+  } else {
+    console.error('Cannot record touch move without a touch start.\n' + 'Touch Move: %s\n', 'Touch Bank: %s', printTouch(touch), printTouchBank());
+  }
+}
+
+function recordTouchEnd(touch) {
+  var touchRecord = touchBank[getTouchIdentifier(touch)];
+  if (touchRecord) {
+    touchRecord.touchActive = false;
+    touchRecord.previousPageX = touchRecord.currentPageX;
+    touchRecord.previousPageY = touchRecord.currentPageY;
+    touchRecord.previousTimeStamp = touchRecord.currentTimeStamp;
+    touchRecord.currentPageX = touch.pageX;
+    touchRecord.currentPageY = touch.pageY;
+    touchRecord.currentTimeStamp = timestampForTouch(touch);
+    touchHistory.mostRecentTimeStamp = timestampForTouch(touch);
+  } else {
+    console.error('Cannot record touch end without a touch start.\n' + 'Touch End: %s\n', 'Touch Bank: %s', printTouch(touch), printTouchBank());
+  }
+}
+
+function printTouch(touch) {
+  return JSON.stringify({
+    identifier: touch.identifier,
+    pageX: touch.pageX,
+    pageY: touch.pageY,
+    timestamp: timestampForTouch(touch)
+  });
+}
+
+function printTouchBank() {
+  var printed = JSON.stringify(touchBank.slice(0, MAX_TOUCH_BANK));
+  if (touchBank.length > MAX_TOUCH_BANK) {
+    printed += ' (original size: ' + touchBank.length + ')';
+  }
+  return printed;
+}
+
+var ResponderTouchHistoryStore = {
+  recordTouchTrack: function (topLevelType, nativeEvent) {
+    if (isMoveish(topLevelType)) {
+      nativeEvent.changedTouches.forEach(recordTouchMove);
+    } else if (isStartish(topLevelType)) {
+      nativeEvent.changedTouches.forEach(recordTouchStart);
+      touchHistory.numberActiveTouches = nativeEvent.touches.length;
+      if (touchHistory.numberActiveTouches === 1) {
+        touchHistory.indexOfSingleActiveTouch = nativeEvent.touches[0].identifier;
+      }
+    } else if (isEndish(topLevelType)) {
+      nativeEvent.changedTouches.forEach(recordTouchEnd);
+      touchHistory.numberActiveTouches = nativeEvent.touches.length;
+      if (touchHistory.numberActiveTouches === 1) {
+        for (var i = 0; i < touchBank.length; i++) {
+          var touchTrackToCheck = touchBank[i];
+          if (touchTrackToCheck != null && touchTrackToCheck.touchActive) {
+            touchHistory.indexOfSingleActiveTouch = i;
+            break;
+          }
+        }
+        if (process.env.NODE_ENV !== 'production') {
+          var activeRecord = touchBank[touchHistory.indexOfSingleActiveTouch];
+          process.env.NODE_ENV !== 'production' ? warning(activeRecord != null && activeRecord.touchActive, 'Cannot find single active touch.') : void 0;
+        }
+      }
+    }
+  },
+
+
+  touchHistory: touchHistory
+};
+
+module.exports = ResponderTouchHistoryStore;
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