node_modules

1 files changed, 63 insertions, 0 deletions

diff --git a/node_modules/fbjs/lib/Style.js.flow b/node_modules/fbjs/lib/Style.js.flow
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+/**
+ * Copyright (c) 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.
+ *
+ * @providesModule Style
+ * @typechecks
+ */
+
+var getStyleProperty = require('./getStyleProperty');
+
+/**
+ * @param {DOMNode} element [description]
+ * @param {string} name Overflow style property name.
+ * @return {boolean} True if the supplied ndoe is scrollable.
+ */
+function _isNodeScrollable(element, name) {
+  var overflow = Style.get(element, name);
+  return overflow === 'auto' || overflow === 'scroll';
+}
+
+/**
+ * Utilities for querying and mutating style properties.
+ */
+var Style = {
+  /**
+   * Gets the style property for the supplied node. This will return either the
+   * computed style, if available, or the declared style.
+   *
+   * @param {DOMNode} node
+   * @param {string} name Style property name.
+   * @return {?string} Style property value.
+   */
+  get: getStyleProperty,
+
+  /**
+   * Determines the nearest ancestor of a node that is scrollable.
+   *
+   * NOTE: This can be expensive if used repeatedly or on a node nested deeply.
+   *
+   * @param {?DOMNode} node Node from which to start searching.
+   * @return {?DOMWindow|DOMElement} Scroll parent of the supplied node.
+   */
+  getScrollParent: function (node) {
+    if (!node) {
+      return null;
+    }
+    var ownerDocument = node.ownerDocument;
+    while (node && node !== ownerDocument.body) {
+      if (_isNodeScrollable(node, 'overflow') || _isNodeScrollable(node, 'overflowY') || _isNodeScrollable(node, 'overflowX')) {
+        return node;
+      }
+      node = node.parentNode;
+    }
+    return ownerDocument.defaultView || ownerDocument.parentWindow;
+  }
+
+};
+
+module.exports = Style;
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