You can not select more than 25 topics
Topics must start with a letter or number, can include dashes ('-') and can be up to 35 characters long.
45 lines
1.3 KiB
45 lines
1.3 KiB
/** |
|
* Copyright 2013-2015, 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. |
|
* |
|
* @providesModule getEventModifierState |
|
* @typechecks static-only |
|
*/ |
|
|
|
'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) { |
|
/*jshint validthis:true */ |
|
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;
|
|
|