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test_after_paint_pref.html 
<!DOCTYPE HTML>
<html>
<!--
https://bugzilla.mozilla.org/show_bug.cgi?id=608030
-->
<head>
  <title>Test for MozAfterPaint pref Bug 608030</title>
  <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.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=608030">Mozilla Bug 608030</a>
<div id="display" style="width: 10em; height: 5em; background-color: red"></div>
<pre id="test">
<script type="application/javascript">

/** Test for Bug 608030 **/

function get_pref()
{
  return SpecialPowers.getBoolPref("dom.send_after_paint_to_content");
}

function set_pref(val)
{
  SpecialPowers.setBoolPref("dom.send_after_paint_to_content", val);
}

SimpleTest.waitForExplicitFinish();

window.addEventListener("load", step0, false);

is(get_pref(), true, "pref defaults to true in mochitest harness");

function print_rect(rect) {
  return "(top=" + rect.top + ",left=" + rect.left + ",width=" + rect.width + ",height=" + rect.height + ")";
}

function print_event(event) {
  var res = "boundingClientRect=" + print_rect(event.boundingClientRect);
  var rects = event.clientRects;
  for (var i = 0; i < rects.length; ++i) {
    res += " clientRects[" + i + "]=" + print_rect(rects[i]);
  }
  return res;
}

function step0(event) {
  // Wait until we get the MozAfterPaint following the load event
  // before starting.
  ok(true, "loaded");
  window.addEventListener("MozAfterPaint", step1, false);

  // Ensure a MozAfterPaint event is fired
  div.style.backgroundColor = "yellow";
}

var start;
var div = document.getElementById("display");

function step1(event)
{
  ok(true, "step1 reached: " + print_event(event));
  window.removeEventListener("MozAfterPaint", step1, false);

  start = Date.now();

  window.addEventListener("MozAfterPaint", step2, false);

  div.style.backgroundColor = "blue";
}

function step2(event)
{
  ok(true, "step2 reached: " + print_event(event));
  window.removeEventListener("MozAfterPaint", step2, false);

  var end = Date.now();
  var timeout = 3 * Math.max(end - start, 300);

  ok(true, "got MozAfterPaint (timeout for next step is " + timeout + "ms)");

  // Set the pref for our second test
  set_pref(false);

  // When there was previously another page in our window, we seem to
  // get duplicate events, simultaneously, so we need to register our
  // next listener after a zero timeout.
  setTimeout(step3, 0, timeout);
}
function step3(timeout)
{
  ok(true, "step3 reached");
  window.addEventListener("MozAfterPaint", failstep, false);

  div.style.backgroundColor = "fuchsia";

  setTimeout(step4, timeout);
}

function failstep(event)
{
  ok(true, "failstep reached: " + print_event(event));
  ok(false, "got MozAfterPaint when we should not have");
}

function step4()
{
  ok(true, "step4 reached"); // If we didn't get the failure in failstep,
                             // then we passed.

  window.removeEventListener("MozAfterPaint", failstep, false);

  // Set the pref back in its initial state.
  set_pref(true);

  SimpleTest.finish();
}

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