40 lines
1.1 KiB
JavaScript
40 lines
1.1 KiB
JavaScript
/**
|
|
* 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.
|
|
*
|
|
*/
|
|
|
|
'use strict';
|
|
|
|
/**
|
|
* Translation from modifier key to the associated property in the event.
|
|
* @see http://www.w3.org/TR/DOM-Level-3-Events/#keys-Modifiers
|
|
*/
|
|
|
|
var modifierKeyToProp = {
|
|
Alt: 'altKey',
|
|
Control: 'ctrlKey',
|
|
Meta: 'metaKey',
|
|
Shift: 'shiftKey'
|
|
};
|
|
|
|
// IE8 does not implement getModifierState so we simply map it to the only
|
|
// modifier keys exposed by the event itself, does not support Lock-keys.
|
|
// Currently, all major browsers except Chrome seems to support Lock-keys.
|
|
function modifierStateGetter(keyArg) {
|
|
var syntheticEvent = this;
|
|
var nativeEvent = syntheticEvent.nativeEvent;
|
|
if (nativeEvent.getModifierState) {
|
|
return nativeEvent.getModifierState(keyArg);
|
|
}
|
|
var keyProp = modifierKeyToProp[keyArg];
|
|
return keyProp ? !!nativeEvent[keyProp] : false;
|
|
}
|
|
|
|
function getEventModifierState(nativeEvent) {
|
|
return modifierStateGetter;
|
|
}
|
|
|
|
module.exports = getEventModifierState; |