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https://github.com/facebook/react.git
synced 2025-11-01 09:12:30 +00:00
Brian Vaughn
b1a03dfdc8
* Renamed 'events' package to 'legacy-events' * Updated 'events' references to point to 'legacy-events'
44 lines
1.2 KiB
JavaScript
44 lines
1.2 KiB
JavaScript
/**
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* Copyright (c) Facebook, Inc. and its affiliates.
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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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* @flow
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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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import type {AnyNativeEvent} from 'legacy-events/PluginModuleType';
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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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// Older browsers (Safari <= 10, iOS Safari <= 10.2) do not support
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// getModifierState. If getModifierState is not supported, we map it to a set of
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// modifier keys exposed by the event. In this case, Lock-keys are not supported.
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function modifierStateGetter(keyArg: string): boolean {
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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(
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nativeEvent: AnyNativeEvent,
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): (keyArg: string) => boolean {
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return modifierStateGetter;
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}
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export default getEventModifierState;
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