data-provider-temporary
Version:
Library that helps with server-to-client synchronization of data
40 lines (28 loc) • 788 B
JavaScript
/**
* Copyright (c) 2014-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.
*
*
*/
;
const scroll = (size, _ref) => {let offset = _ref.offset,max = _ref.max;
let start = 0;
let index = Math.min(offset, size);
const halfScreen = max / 2;
if (index <= halfScreen) {
start = 0;
} else {
if (size >= max) {
start = Math.min(index - halfScreen - 1, size - max);
}
index = Math.min(index - start, size);
}
return {
end: Math.min(size, start + max),
index,
start };
};
module.exports = scroll;