gecko-dev/toolkit/content/tests/chrome/test_popupremoving.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"?>

<window title="Popup Removing Tests"
        onload="setTimeout(nextTest, 0)"
        onDOMAttrModified="modified(event)"
        xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">

<!--
  This test checks that popup elements can be removed in various ways without
  crashing. It tests two situations, one with menus that are 'separate', and
  one with menus that are 'nested'. In each case, there are four levels of menu.

  The nextTest function starts the process by opening the first menu. A set of
  popupshown event listeners are used to open the next menu until all four are
  showing. This last one calls removePopup to remove the menu node from the
  tree. This should hide the popups as they are no longer in a document.

  A mutation listener is triggered when the fourth menu closes by having its
  open attribute cleared. This listener hides the third popup which causes
  its frame to be removed. Naturally, we want to ensure that this doesn't
  crash when the third menu is removed.
  -->

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

<hbox>

<menu id="nestedmenu1" label="1">
    <menupopup id="nestedpopup1" onpopupshown="if (event.target == this) this.firstChild.open = true">
      <menu id="nestedmenu2" label="2">
        <menupopup id="nestedpopup2" onpopupshown="if (event.target == this) this.firstChild.open = true">
          <menu id="nestedmenu3" label="3">
            <menupopup id="nestedpopup3" onpopupshown="if (event.target == this) this.firstChild.open = true">
              <menu id="nestedmenu4" label="4" onpopupshown="removePopups()">
                <menupopup id="nestedpopup4">
                  <menuitem label="Nested 1"/>
                  <menuitem label="Nested 2"/>
                  <menuitem label="Nested 3"/>
                </menupopup>
              </menu>
            </menupopup>
          </menu>
        </menupopup>
      </menu>
    </menupopup>
</menu>

<menu id="separatemenu1" label="1">
    <menupopup id="separatepopup1" onpopupshown="$('separatemenu2').open = true">
        <menuitem label="L1 One"/>
        <menuitem label="L1 Two"/>
        <menuitem label="L1 Three"/>
    </menupopup>
</menu>

<menu id="separatemenu2" label="2">
    <menupopup id="separatepopup2" onpopupshown="$('separatemenu3').open = true"
                                   onpopuphidden="popup2Hidden()">
        <menuitem label="L2 One"/>
        <menuitem label="L2 Two"/>
        <menuitem label="L2 Three"/>
    </menupopup>
</menu>

<menu id="separatemenu3" label="3" onpopupshown="$('separatemenu4').open = true">
    <menupopup id="separatepopup3">
        <menuitem label="L3 One"/>
        <menuitem label="L3 Two"/>
        <menuitem label="L3 Three"/>
    </menupopup>
</menu>

<menu id="separatemenu4" label="4" onpopupshown="removePopups()"
                                   onpopuphidden="$('separatemenu2').open = false">
    <menupopup id="separatepopup3">
        <menuitem label="L4 One"/>
        <menuitem label="L4 Two"/>
        <menuitem label="L4 Three"/>
    </menupopup>
</menu>

</hbox>

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

SimpleTest.waitForExplicitFinish();

var gKey = "";
gTriggerMutation = null;
gChangeMutation = null;

function nextTest()
{
  if (gKey == "") {
    gKey = "separate";
  }
  else if (gKey == "separate") {
    gKey = "nested";
  }
  else {
    SimpleTest.finish();
    return;
  }

  $(gKey + "menu1").open = true;
}

function modified(event)
{
  // use this mutation listener to hide the third popup, destroying its frame.
  // It gets triggered when the open attribute is cleared on the fourth menu.

  if (event.target == gTriggerMutation &&
      event.attrName == "open") {
    gChangeMutation.hidden = true;
    // force a layout flush
    document.documentElement.boxObject.width;
    gTriggerMutation = null;
    gChangeMutation = null;
  }
}

function removePopups()
{
  var menu2 = $(gKey + "menu2");
  var menu3 = $(gKey + "menu3");
  is(menu2.getAttribute("open"), "true", gKey + " menu 2 open before");
  is(menu3.getAttribute("open"), "true", gKey + " menu 3 open before");

  gTriggerMutation = menu3;
  gChangeMutation = $(gKey + "menu4");
  var menu = $(gKey + "menu1");
  menu.remove();

  if (gKey == "nested") {
    // the 'separate' test checks this during the popup2 hidden event handler
    is(menu2.hasAttribute("open"), false, gKey + " menu 2 open after");
    is(menu3.hasAttribute("open"), false, gKey + " menu 3 open after");
    nextTest();
  }
}

function popup2Hidden()
{
  is($(gKey + "menu2").hasAttribute("open"), false, gKey + " menu 2 open after");
  nextTest();
}

]]>
</script>

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<p id="display">
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<div id="content" style="display: none">
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<pre id="test">
</pre>
</body>

</window>