layout/base/tests/test_scroll_event_ordering.html
author Seth Fowler <mark.seth.fowler@gmail.com>
Tue, 21 Apr 2015 09:44:43 -0700
changeset 240210 2dfcc10c727060da6cd8d0c88c45d1b034b94a37
parent 231633 346347b1255daf5625aeac8e90814fca5e05aa05
child 252801 e30ea5d48d7b05fc217b3f4bcf099ab2bf1732b6
permissions -rw-r--r--
Bug 1145439 (Part 2) - Make test_scroll_event_ordering.html wait for rAF to unthrottle. r=roc

<!DOCTYPE HTML>
<html>
<!--
https://bugzilla.mozilla.org/show_bug.cgi?id=785588
-->
<head>
  <title>Test for Bug 785588 --- ordering of scroll-related events</title>
  <script type="text/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
  <script type="text/javascript" src="/tests/SimpleTest/EventUtils.js"></script>
  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css" />
</head>
<body>
<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=785588">Mozilla Bug 785588</a>
<div id="content">
  <div id="d" style="border:2px solid black; width:100px; height:100px; overflow:auto">
    <div id="inner" style="height:200px;">Hello</div>
  </div>
</div>
<pre id="test">
<script>
SimpleTest.waitForExplicitFinish();

var smoothScrollPref = "general.smoothScroll";

var d = document.getElementById("d");
d.scrollTop = 0;
var inner = document.getElementById("inner");

var state = "initial";

function onFrame() {
  is(state, "initial", "Must be in initial state");
  ok(d.scrollTop > 0, "Must have scrolled by some amount (got " + d.scrollTop + ")");
  state = "didOnFrame";
}

function onScroll() {
  is(state, "didOnFrame", "Must have got requestAnimationFrame callback already");
  ok(d.scrollTop > 0, "Must have scrolled by some amount (got " + d.scrollTop + ")");
  SimpleTest.finish();
}

function doTest() {
  window.getSelection().collapse(inner.firstChild, 0);
  window.mozRequestAnimationFrame(onFrame);
  d.onscroll = onScroll;
  sendKey("DOWN");
}

function prepareTest() {
  // Start the test after we've gotten at least one rAF callback, to make sure
  // that rAF is no longer throttled. (See bug 1145439.)
  window.mozRequestAnimationFrame(function() {
    SpecialPowers.pushPrefEnv({"set":[[smoothScrollPref, false]]}, doTest);
  });
}

SimpleTest.waitForFocus(prepareTest);

</script>
</pre>
</body>
</html>