third_party/WebKit/LayoutTests/fast/scroll-behavior/scroll-customization/scrollstate-consume-deltas.html

   1 <!DOCTYPE html>
   2 <html>
   3 <head>
   4 <title>ScrollState consumeDelta</title>
   5 <script src="../../../resources/testharness.js"></script>
   6 <script src="../../../resources/testharnessreport.js"></script>
   7 </head>
   8 <body>
   9 <script>
  10
  11 function deltaShouldBe(scrollState, x, y, testName) {
  12   test(function() {
  13     assert_equals(scrollState.deltaX, x);
  14     assert_equals(scrollState.deltaY, y);
  15   }, testName);
  16 }
  17
  18 test(function() {
  19   assert_true('ScrollState' in window, "'ScrollState' in window");
  20 }, "These tests only work with scroll customization enabled.");
  21
  22 if ('ScrollState' in window) {
  23   var scrollState = new ScrollState(10, -20);
  24   deltaShouldBe(scrollState, 10, -20, "Unconsumed deltas");
  25   scrollState.consumeDelta(2, -3);
  26   deltaShouldBe(scrollState, 8, -17, "Partially consumed deltas");
  27   scrollState.consumeDelta(8, -17);
  28   deltaShouldBe(scrollState, 0, 0, "Fully consumed deltas");
  29 }
  30 </script>
  31 </body>
  32 </html>