53 lines
1.9 KiB
JavaScript
53 lines
1.9 KiB
JavaScript
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/**
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* Copyright 2013-present, 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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*/
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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 '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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deltaY: function (event) {
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return '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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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, nativeEventTarget) {
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return SyntheticMouseEvent.call(this, dispatchConfig, dispatchMarker, nativeEvent, nativeEventTarget);
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}
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SyntheticMouseEvent.augmentClass(SyntheticWheelEvent, WheelEventInterface);
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module.exports = SyntheticWheelEvent;
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