46 lines
1.4 KiB
JavaScript
46 lines
1.4 KiB
JavaScript
/**
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* Copyright (c) 2015-present, 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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var SHORTCUT_ESCAPE = 'SHORTCUT_ESCAPE',
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SHORTCUT_LEFT = 'SHORTCUT_LEFT',
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SHORTCUT_RIGHT = 'SHORTCUT_RIGHT';
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var boundKeyHandler = null;
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function keyHandler(callback, e) {
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var key = e.key,
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keyCode = e.keyCode,
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which = e.which;
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if (key === 'Escape' || keyCode === 27 || which === 27) {
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callback(SHORTCUT_ESCAPE);
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} else if (key === 'ArrowLeft' || keyCode === 37 || which === 37) {
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callback(SHORTCUT_LEFT);
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} else if (key === 'ArrowRight' || keyCode === 39 || which === 39) {
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callback(SHORTCUT_RIGHT);
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}
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}
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function registerShortcuts(target, callback) {
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if (boundKeyHandler !== null) {
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return;
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}
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boundKeyHandler = keyHandler.bind(undefined, callback);
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target.addEventListener('keydown', boundKeyHandler);
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}
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function unregisterShortcuts(target) {
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if (boundKeyHandler === null) {
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return;
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}
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target.removeEventListener('keydown', boundKeyHandler);
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boundKeyHandler = null;
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}
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export { SHORTCUT_ESCAPE, SHORTCUT_LEFT, SHORTCUT_RIGHT, registerShortcuts as register, unregisterShortcuts as unregister, keyHandler as handler }; |