node_modules

1 files changed, 88 insertions, 0 deletions

diff --git a/node_modules/react-dom/lib/ReactRef.js b/node_modules/react-dom/lib/ReactRef.js
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+++ b/node_modules/react-dom/lib/ReactRef.js
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+/**
+ * Copyright 2013-present, 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.
+ *
+ * 
+ */
+
+'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) {
+  if (element === null || typeof element !== 'object') {
+    return;
+  }
+  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.
+
+  var prevRef = null;
+  var prevOwner = null;
+  if (prevElement !== null && typeof prevElement === 'object') {
+    prevRef = prevElement.ref;
+    prevOwner = prevElement._owner;
+  }
+
+  var nextRef = null;
+  var nextOwner = null;
+  if (nextElement !== null && typeof nextElement === 'object') {
+    nextRef = nextElement.ref;
+    nextOwner = nextElement._owner;
+  }
+
+  return prevRef !== nextRef ||
+  // If owner changes but we have an unchanged function ref, don't update refs
+  typeof nextRef === 'string' && nextOwner !== prevOwner;
+};
+
+ReactRef.detachRefs = function (instance, element) {
+  if (element === null || typeof element !== 'object') {
+    return;
+  }
+  var ref = element.ref;
+  if (ref != null) {
+    detachRef(ref, instance, element._owner);
+  }
+};
+
+module.exports = ReactRef;
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