chrome/test/data/webui/list_selection_model_test_util.js

   1 // Copyright 2013 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 /**
   6  * Creates an array spanning a range of integer values.
   7  * @param {number} start The first number in the range.
   8  * @param {number} end The last number in the range inclusive.
   9  * @return {!Array<number>}
  10  */
  11 function range(start, end) {
  12   var a = [];
  13   for (var i = start; i <= end; i++) {
  14     a.push(i);
  15   }
  16   return a;
  17 }
  18
  19 /**
  20  * Modifies a selection model.
  21  * @param {!ListSelectionModel} model The selection model to adjust.
  22  * @param {number} index Starting index of the edit.
  23  * @param {number} removed Number of entries to remove from the list.
  24  * @param {number} added Number of entries to add to the list.
  25  */
  26 function adjust(model, index, removed, added) {
  27   var permutation = [];
  28   for (var i = 0; i < index; i++) {
  29     permutation.push(i);
  30   }
  31   for (var i = 0; i < removed; i++) {
  32     permutation.push(-1);
  33   }
  34   for (var i = index + removed; i < model.length; i++) {
  35     permutation.push(i - removed + added);
  36   }
  37   model.adjustLength(model.length - removed + added);
  38   model.adjustToReordering(permutation);
  39 }