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/**
* Copyright (c) 2013-present, Facebook, Inc.
*
* This source code is licensed under the MIT license found in the
* LICENSE file in the root directory of this source tree.
*
* @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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