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"use strict"; /** * Copyright (c) 2013-present, Facebook, Inc. * * This source code is licensed under the MIT license found in the * LICENSE file in the root directory of this source tree. * */ var TouchEventUtils = { /** * Utility function for common case of extracting out the primary touch from a * touch event. * - `touchEnd` events usually do not have the `touches` property. * http://stackoverflow.com/questions/3666929/ * mobile-sarai-touchend-event-not-firing-when-last-touch-is-removed * * @param {Event} nativeEvent Native event that may or may not be a touch. * @return {TouchesObject?} an object with pageX and pageY or null. */ extractSingleTouch: function extractSingleTouch(nativeEvent) { var touches = nativeEvent.touches; var changedTouches = nativeEvent.changedTouches; var hasTouches = touches && touches.length > 0; var hasChangedTouches = changedTouches && changedTouches.length > 0; return !hasTouches && hasChangedTouches ? changedTouches[0] : hasTouches ? touches[0] : nativeEvent; } }; module.exports = TouchEventUtils;