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test_key_event_counts.xul 
<?xml version="1.0"?>
<?xml-stylesheet href="chrome://global/skin" type="text/css"?>
<?xml-stylesheet href="chrome://mochikit/content/tests/SimpleTest/test.css" type="text/css"?>

<!-- We've had issues on Mac OS X where native key events either don't get processed
     or they get processed twice. This test tests some of those scenarios. -->

<window id="window1" title="Test Key Event Counts" onload="runTest()"
  xmlns:html="http://www.w3.org/1999/xhtml"
  xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">

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

  <!-- test results are displayed in the html:body -->
  <body xmlns="http://www.w3.org/1999/xhtml">
    <p id="display"></p>
    <div id="content" style="display: none"></div>
    <pre id="test"></pre>
  </body>

  <script type="application/javascript"><![CDATA[
    var gKeyPressEventCount = 0;
    var gKeyDownEventCound = 0;

    function onKeyDown(e)
    {
      gKeyDownEventCount++;
    }

    function onKeyPress(e)
    {
      gKeyPressEventCount++;
      e.preventDefault();
    }

    function* testBody()
    {
      window.addEventListener("keydown", onKeyDown, false);
      window.addEventListener("keypress", onKeyPress, false);

      // Test ctrl-tab
      gKeyDownEventCount = 0;
      gKeyPressEventCount = 0;
      yield synthesizeNativeKey(KEYBOARD_LAYOUT_EN_US, MAC_VK_Tab, {ctrlKey:1}, "\t", "\t", continueTest);
      is(gKeyDownEventCount, 1);
      is(gKeyPressEventCount, 0, "ctrl-tab should be consumed by tabbox of tabbrowser at keydown");

      // Test cmd+shift+a
      gKeyDownEventCount = 0;
      gKeyPressEventCount = 0;
      yield synthesizeNativeKey(KEYBOARD_LAYOUT_EN_US, MAC_VK_ANSI_A, {metaKey:1, shiftKey:1}, "a", "A", continueTest);
      is(gKeyDownEventCount, 1);
      is(gKeyPressEventCount, 1);

      // Test cmd-;
      gKeyDownEventCount = 0;
      gKeyPressEventCount = 0;
      yield synthesizeNativeKey(KEYBOARD_LAYOUT_EN_US, MAC_VK_ANSI_Semicolon, {metaKey:1}, ";", ";", continueTest);
      is(gKeyDownEventCount, 1);
      is(gKeyPressEventCount, 1);

      window.removeEventListener("keydown", onKeyDown, false);
      window.removeEventListener("keypress", onKeyPress, false);
    }

    var gTestContinuation = null;

    function continueTest()
    {
      if (!gTestContinuation) {
        gTestContinuation = testBody();
      }
      var ret = gTestContinuation.next();
      if (ret.done) {
        SimpleTest.finish();
      } else {
        is(ret.value, true, "Key synthesized successfully");
      }
    }

    function runTest()
    {
      SimpleTest.waitForExplicitFinish();
      continueTest();
    }
  ]]></script>

</window>
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