mirror of
https://github.com/facebook/react.git
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5bd2321ae3
* react-dom: convert packages/react-dom/src/client * react-dom: convert packages/react-dom/src/events * react-dom: convert packages/react-dom/src/test-utils * react-dom: convert files on root * react-dom: convert updated ReactDOM-test.js
38 lines
1.1 KiB
JavaScript
38 lines
1.1 KiB
JavaScript
/**
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* Copyright (c) 2013-present, Facebook, Inc.
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*
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* This source code is licensed under the MIT license found in the
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* LICENSE file in the root directory of this source tree.
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*/
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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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const 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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const syntheticEvent = this;
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const 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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const 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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export default getEventModifierState;
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