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59 lines
1.9 KiB
59 lines
1.9 KiB
/** |
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* Copyright 2013-2015, Facebook, Inc. |
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* All rights reserved. |
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* |
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* This source code is licensed under the BSD-style license found in the |
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* LICENSE file in the root directory of this source tree. An additional grant |
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* of patent rights can be found in the PATENTS file in the same directory. |
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* |
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* @providesModule SyntheticWheelEvent |
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* @typechecks static-only |
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*/ |
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'use strict'; |
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var SyntheticMouseEvent = require("./SyntheticMouseEvent"); |
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/** |
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* @interface WheelEvent |
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* @see http://www.w3.org/TR/DOM-Level-3-Events/ |
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*/ |
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var WheelEventInterface = { |
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deltaX: function(event) { |
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return ( |
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'deltaX' in event ? event.deltaX : |
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// Fallback to `wheelDeltaX` for Webkit and normalize (right is positive). |
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'wheelDeltaX' in event ? -event.wheelDeltaX : 0 |
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); |
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}, |
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deltaY: function(event) { |
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return ( |
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'deltaY' in event ? event.deltaY : |
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// Fallback to `wheelDeltaY` for Webkit and normalize (down is positive). |
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'wheelDeltaY' in event ? -event.wheelDeltaY : |
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// Fallback to `wheelDelta` for IE<9 and normalize (down is positive). |
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'wheelDelta' in event ? -event.wheelDelta : 0 |
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); |
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}, |
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deltaZ: null, |
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// Browsers without "deltaMode" is reporting in raw wheel delta where one |
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// notch on the scroll is always +/- 120, roughly equivalent to pixels. |
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// A good approximation of DOM_DELTA_LINE (1) is 5% of viewport size or |
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// ~40 pixels, for DOM_DELTA_SCREEN (2) it is 87.5% of viewport size. |
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deltaMode: null |
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}; |
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/** |
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* @param {object} dispatchConfig Configuration used to dispatch this event. |
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* @param {string} dispatchMarker Marker identifying the event target. |
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* @param {object} nativeEvent Native browser event. |
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* @extends {SyntheticMouseEvent} |
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*/ |
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function SyntheticWheelEvent(dispatchConfig, dispatchMarker, nativeEvent) { |
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SyntheticMouseEvent.call(this, dispatchConfig, dispatchMarker, nativeEvent); |
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} |
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SyntheticMouseEvent.augmentClass(SyntheticWheelEvent, WheelEventInterface); |
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module.exports = SyntheticWheelEvent;
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