react app

react-app/node_modules/react/lib/getEventModifierState.js

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+/**
+ * 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;