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node_modules/react/lib/getUnboundedScrollPosition.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 getUnboundedScrollPosition
+ * @typechecks
+ */
+
+"use strict";
+
+/**
+ * Gets the scroll position of the supplied element or window.
+ *
+ * The return values are unbounded, unlike `getScrollPosition`. This means they
+ * may be negative or exceed the element boundaries (which is possible using
+ * inertial scrolling).
+ *
+ * @param {DOMWindow|DOMElement} scrollable
+ * @return {object} Map with `x` and `y` keys.
+ */
+function getUnboundedScrollPosition(scrollable) {
+  if (scrollable === window) {
+    return {
+      x: window.pageXOffset || document.documentElement.scrollLeft,
+      y: window.pageYOffset || document.documentElement.scrollTop
+    };
+  }
+  return {
+    x: scrollable.scrollLeft,
+    y: scrollable.scrollTop
+  };
+}
+
+module.exports = getUnboundedScrollPosition;