<?xml version="1.0"?>
<?xml-stylesheet href="chrome://global/skin" type="text/css"?>
<window title="Mozilla Bug 478536"
  width="600" height="600"
  onload="onload();"
  onunload="onunload();"
  xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">

  <script type="application/javascript"
          src="chrome://mochikit/content/tests/SimpleTest/EventUtils.js" />

<body xmlns="http://www.w3.org/1999/xhtml" id="body">
<style type="text/css">
  #view {
    overflow: auto;
    width: 100px;
    height: 100px;
    border: 1px solid;
    margin: 0;
  }
</style>
<pre id="view" onscroll="onScrollView(event);">
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</pre>
</body>

<script class="testbody" type="application/javascript">
<![CDATA[

function ok(aCondition, aMessage)
{
  window.opener.wrappedJSObject.SimpleTest.ok(aCondition, aMessage);
}

function is(aLeft, aRight, aMessage)
{
  window.opener.wrappedJSObject.SimpleTest.is(aLeft, aRight, aMessage);
}

function isnot(aLeft, aRight, aMessage)
{
  window.opener.wrappedJSObject.SimpleTest.isnot(aLeft, aRight, aMessage);
}

var gBody = document.getElementById("body");
var gView = document.getElementById("view");

/**
 * Description:
 *
 *   First, lock the wheel scrolling target to "view" at first step.
 *   Next, scroll back to top most of the "view" at second step.
 *   Finally, scroll back again at third step.  This fails to scroll the "view",
 *   then, |onMouseScrollFailed| event should be fired.  And at that time, we
 *   can remove the "view".  So, in post processing of the event firere, the
 *   "view" should not be referred.
 *
 *   For suppressing random test failure, all tests will be retried if we handle
 *   unexpected timeout event.
 */

var gTests = [
 { scrollToForward: true,  shouldScroll: true },
 { scrollToForward: false, shouldScroll: true },
 { scrollToForward: false, shouldScroll: false }
];
var gCurrentTestIndex = -1;
var gIgnoreScrollEvent = true;

var gPrefSvc = Components.classes["@mozilla.org/preferences-service;1"].
               getService(Components.interfaces.nsIPrefBranch2);
const kPrefNameTimeout = "mousewheel.transaction.timeout";
const kDefaultTimeout = gPrefSvc.getIntPref(kPrefNameTimeout);

var gTimeout = kDefaultTimeout;

gBody.addEventListener("MozMouseScrollFailed", onMouseScrollFailed, false);
gBody.addEventListener("MozMouseScrollTransactionTimeout",
                       onTransactionTimeout, false);

function setTimeoutPrefs(aTimeout)
{
  gPrefSvc.setIntPref(kPrefNameTimeout, aTimeout);
  gTimeout = aTimeout;
}

function resetTimeoutPrefs()
{
  if (gTimeout == kDefaultTimeout)
    return;
  setTimeoutPrefs(kDefaultTimeout);
}

function growUpTimeoutPrefs()
{
  if (gTimeout != kDefaultTimeout)
    return;
  setTimeoutPrefs(5000);
}

function onload()
{
  disableNonTestMouseEvents(true);
  setTimeout(runNextTest, 0);
}

function onunload()
{
  resetTimeoutPrefs();
  disableNonTestMouseEvents(false);
  window.opener.wrappedJSObject.SimpleTest.finish();
}

function finish()
{
  window.close();
}

// testing code

var gTimer;
function clearTimer()
{
  clearTimeout(gTimer);
  gTimer = 0;
}

function runNextTest()
{
  clearTimer();
  if (++gCurrentTestIndex >= gTests.length) {
    ok(true, "didn't crash, succeeded");
    finish();
    return;
  }
  fireWheelScrollEvent(gTests[gCurrentTestIndex].scrollToForward);
}

var gRetryCount = 5;
function retryAllTests()
{
  clearTimer();
  if (--gRetryCount >= 0) {
    gView.scrollTop = 0;
    gView.scrollLeft = 0;
    gCurrentTestIndex = -1;
    growUpTimeoutPrefs();
    ok(true, "WARNING: retry current test-list...");
    gTimer = setTimeout(runNextTest, 0);
  } else {
    ok(false, "Failed by unexpected timeout");
    finish();
  }
}

function fireWheelScrollEvent(aForward)
{
  gIgnoreScrollEvent = false;
  var event = { axis: "vertical", delta: aForward ? 4 : -4,
                type: "DOMMouseScroll" };
  synthesizeMouseScroll(gView, 5, 5, event, window);
}

function onScrollView(aEvent)
{
  if (gIgnoreScrollEvent)
    return;
  gIgnoreScrollEvent = true;
  clearTimer();
  ok(gTests[gCurrentTestIndex].shouldScroll, "The view is scrolled");
  gTimer = setTimeout(runNextTest, 0);
}

function onMouseScrollFailed(aEvent)
{
  clearTimer();
  gIgnoreScrollEvent = true;
  ok(!gTests[gCurrentTestIndex].shouldScroll, "The view is not scrolled");
  if (!gTests[gCurrentTestIndex].shouldScroll)
    gBody.removeChild(gView);
  runNextTest();
}

function onTransactionTimeout(aEvent)
{
  if (!gTimer)
    return;
  gIgnoreScrollEvent = true;
  retryAllTests();
}

]]>
</script>

</window>
