react app

react-app/node_modules/react/lib/ReactRef.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 ReactRef
+ */
+
+'use strict';
+
+var ReactOwner = require("./ReactOwner");
+
+var ReactRef = {};
+
+function attachRef(ref, component, owner) {
+  if (typeof ref === 'function') {
+    ref(component.getPublicInstance());
+  } else {
+    // Legacy ref
+    ReactOwner.addComponentAsRefTo(component, ref, owner);
+  }
+}
+
+function detachRef(ref, component, owner) {
+  if (typeof ref === 'function') {
+    ref(null);
+  } else {
+    // Legacy ref
+    ReactOwner.removeComponentAsRefFrom(component, ref, owner);
+  }
+}
+
+ReactRef.attachRefs = function(instance, element) {
+  var ref = element.ref;
+  if (ref != null) {
+    attachRef(ref, instance, element._owner);
+  }
+};
+
+ReactRef.shouldUpdateRefs = function(prevElement, nextElement) {
+  // If either the owner or a `ref` has changed, make sure the newest owner
+  // has stored a reference to `this`, and the previous owner (if different)
+  // has forgotten the reference to `this`. We use the element instead
+  // of the public this.props because the post processing cannot determine
+  // a ref. The ref conceptually lives on the element.
+
+  // TODO: Should this even be possible? The owner cannot change because
+  // it's forbidden by shouldUpdateReactComponent. The ref can change
+  // if you swap the keys of but not the refs. Reconsider where this check
+  // is made. It probably belongs where the key checking and
+  // instantiateReactComponent is done.
+
+  return (
+    nextElement._owner !== prevElement._owner ||
+    nextElement.ref !== prevElement.ref
+  );
+};
+
+ReactRef.detachRefs = function(instance, element) {
+  var ref = element.ref;
+  if (ref != null) {
+    detachRef(ref, instance, element._owner);
+  }
+};
+
+module.exports = ReactRef;