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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 SyntheticMouseEvent = require('./SyntheticMouseEvent');
/**
* @interface WheelEvent
* @see http://www.w3.org/TR/DOM-Level-3-Events/
*/
var WheelEventInterface = {
deltaX: function (event) {
return 'deltaX' in event ? event.deltaX : // Fallback to `wheelDeltaX` for Webkit and normalize (right is positive).
'wheelDeltaX' in event ? -event.wheelDeltaX : 0;
},
deltaY: function (event) {
return 'deltaY' in event ? event.deltaY : // Fallback to `wheelDeltaY` for Webkit and normalize (down is positive).
'wheelDeltaY' in event ? -event.wheelDeltaY : // Fallback to `wheelDelta` for IE<9 and normalize (down is positive).
'wheelDelta' in event ? -event.wheelDelta : 0;
},
deltaZ: null,
// Browsers without "deltaMode" is reporting in raw wheel delta where one
// notch on the scroll is always +/- 120, roughly equivalent to pixels.
// A good approximation of DOM_DELTA_LINE (1) is 5% of viewport size or
// ~40 pixels, for DOM_DELTA_SCREEN (2) it is 87.5% of viewport size.
deltaMode: null
};
/**
* @param {object} dispatchConfig Configuration used to dispatch this event.
* @param {string} dispatchMarker Marker identifying the event target.
* @param {object} nativeEvent Native browser event.
* @extends {SyntheticMouseEvent}
*/
function SyntheticWheelEvent(dispatchConfig, dispatchMarker, nativeEvent, nativeEventTarget) {
return SyntheticMouseEvent.call(this, dispatchConfig, dispatchMarker, nativeEvent, nativeEventTarget);
}
SyntheticMouseEvent.augmentClass(SyntheticWheelEvent, WheelEventInterface);
module.exports = SyntheticWheelEvent;
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