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