gecko/toolkit/content/tests/widgets/test_menulist_keynav.xul

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

<window title="Menulist Key Navigation Tests"
        xmlns="http://www.mozilla.org/keymaster/gatekeeper/there.is.only.xul">

  <script type="application/javascript" src="/MochiKit/packed.js"></script>
  <script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>      
  <script type="application/javascript" src="/tests/SimpleTest/EventUtils.js"></script>      

<button id="button1" label="One"/>
<menulist id="list">
  <menupopup id="popup" onpopupshowing="return gShowPopup;">
    <menuitem id="i1" label="One"/>
    <menuitem id="i2" label="Two"/>
    <menuitem id="i2b" disabled="true" label="Two and a Half"/>
    <menuitem id="i3" label="Three"/>
    <menuitem id="i4" label="Four"/>
  </menupopup>
</menulist>
<button id="button2" label="Two"/>

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

SimpleTest.waitForExplicitFinish();

var gShowPopup = false;

var iswin = (navigator.platform.indexOf("Win") == 0);

function runTests()
{
  var list = $("list");
  list.focus();
  // on Mac, up and cursor keys open the menu, but on other platforms, the
  // cursor keys navigate between items without opening the menu
  if (navigator.platform.indexOf("Mac") == -1) {
    keyCheck(list, "VK_DOWN", 2, "cursor down");
    keyCheck(list, "VK_DOWN", iswin ? "2b" : 3, "cursor down skip disabled");
    keyCheck(list, "VK_UP", 2, "cursor up skip disabled");
    keyCheck(list, "VK_UP", 1, "cursor up");
    keyCheck(list, "VK_UP", 4, "cursor up wrap");
    keyCheck(list, "VK_DOWN", 1, "cursor down wrap");
  }

  // check that attempting to open the menulist does not change the selection
  synthesizeKey("VK_DOWN", { altKey: navigator.platform.indexOf("Mac") == -1 });
  is(list.selectedItem, $("i1"), "open menulist down selectedItem");
  synthesizeKey("VK_UP", { altKey: navigator.platform.indexOf("Mac") == -1 });
  is(list.selectedItem, $("i1"), "open menulist up selectedItem");

  synthesizeKey("G", { });
  is(list.selectedItem, $("i1"), "letter pressed not found selectedItem");

  keyCheck(list, "T", 2, "letter pressed");
  keyCheck(list, "T", 2, "letter pressed");
  setTimeout(pressedAgain, 1200); 
}

function pressedAgain()
{
  var list = $("list");
  keyCheck(list, "T", iswin ? "2b" : 3, "letter pressed again");
  keyCheck(list, "W", 2, "second letter pressed");
  setTimeout(differentPressed, 1200); 
}

function differentPressed()
{
  var list = $("list");
  keyCheck(list, "O", 1, "different letter pressed");

  if (navigator.platform.indexOf("Mac") == -1) {
    $("button1").focus();
    synthesizeKeyExpectEvent("VK_TAB", { }, list, "focus", "focus to menulist");
    synthesizeKeyExpectEvent("VK_TAB", { }, $("button2"), "focus", "focus to button");
    is(document.activeElement, $("button2"), "tab from menulist focused button");
  }

  // now make sure that using a key scrolls the menu correctly
  gShowPopup = true;

  for (let i = 0; i < 65; i++) {
    list.appendItem("Item" + i, "item" + i);
  }
  list.open = true;
  is(list.getBoundingClientRect().width, list.firstChild.getBoundingClientRect().width,
     "menu and popup width match");
  ok(list.getBoundingClientRect().width > list.getItemAtIndex(0).getBoundingClientRect().width + 2,
     "menuitem width accounts for scrollbar");
  list.open = false;

  list.menupopup.maxHeight = 100;
  list.open = true;

  var rowdiff = list.getItemAtIndex(1).getBoundingClientRect().top -
                list.getItemAtIndex(0).getBoundingClientRect().top;

  var item = list.getItemAtIndex(10);
  var originalPosition = item.getBoundingClientRect().top;

  list.menuBoxObject.activeChild = item;
  ok(item.getBoundingClientRect().top < originalPosition,
    "position of item 1: " + item.getBoundingClientRect().top + " -> " + originalPosition);

  originalPosition = item.getBoundingClientRect().top;

  synthesizeKey("VK_DOWN", { });
  is(item.getBoundingClientRect().top, originalPosition - rowdiff, "position of item 10");

  list.open = false;

  SimpleTest.finish();
}

function keyCheck(list, key, index, testname)
{
  var item = $("i" + index);
  synthesizeKeyExpectEvent(key, { }, item, "command", testname);
  is(list.selectedItem, item, testname + " selectedItem");
}

SimpleTest.waitForFocus(runTests);

]]>
</script>

<body xmlns="http://www.w3.org/1999/xhtml">
<p id="display">
</p>
<div id="content" style="display: none">
</div>
<pre id="test">
</pre>
</body>

</window>