third_party/WebKit/LayoutTests/fast/scroll-behavior/scroll-customization/scrollstate-distribute-to-scroll-chain-descendant.html

   1 <!DOCTYPE html>
   2 <html>
   3 <head>
   4 <meta charset="utf-8">
   5 <title>ScrollState constructor behaves correctly</title>
   6 <script src="../../../resources/testharness.js"></script>
   7 <script src="../../../resources/testharnessreport.js"></script>
   8 </head>
   9 <body>
  10 <script>
  11 test(function() {
  12   assert_true('ScrollState' in window, "'ScrollState' in window");
  13   // TODO(tdresser): Don't rely on window.internals. See crbug.com/483091 for details.
  14   assert_true(window.internals !== null, "'ScrollState' in window");
  15 }, "These tests only work with scroll customization enabled.");
  16
  17 var elementCount = 10;
  18 var remainingNumberOfTimesToBeCalled = elementCount;
  19
  20 var distributeScroll = function(scrollState) {
  21   this.calledOrder = elementCount - remainingNumberOfTimesToBeCalled;
  22   remainingNumberOfTimesToBeCalled--;
  23   scrollState.distributeToScrollChainDescendant();
  24 }
  25
  26 var elements = [];
  27 for (var i = 0; i < elementCount; ++i) {
  28   var element = document.createElement("div");
  29   element.creationOrder = i;
  30   element.setDistributeScroll(distributeScroll.bind(element), "disable-native-scroll");
  31   elements.push(element);
  32 }
  33
  34 if ('ScrollState' in window && window.internals) {
  35   test(function() {
  36     var scrollState = new ScrollState(100, 0, 0, 0, 0, false, false);
  37     window.internals.setScrollChain(scrollState, elements);
  38     scrollState.distributeToScrollChainDescendant();
  39     assert_equals(0, remainingNumberOfTimesToBeCalled);
  40     for (var i = 0; i < elementCount; ++i) {
  41       assert_equals(elements[i].creationOrder, elements[i].calledOrder);
  42     }
  43   }, "distributeToScrollChainDescendant propagates correctly.");
  44
  45   test(function() {
  46     var scrollState = new ScrollState(100, 0, 0, 0, 0, false, false);
  47     window.internals.setScrollChain(scrollState, []);
  48     assert_equals(0, remainingNumberOfTimesToBeCalled);
  49     scrollState.distributeToScrollChainDescendant();
  50     assert_equals(0, remainingNumberOfTimesToBeCalled);
  51   }, "distributeToScrollChainDescendant with empty scroll chain does nothing.");
  52 }
  53 </script>
  54 </body>
  55 </html>