test_media_query_list.html

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Test Info:

Manifest: layout/style/test/mochitest.toml

<!DOCTYPE HTML>

<html>

<!--

https://bugzilla.mozilla.org/show_bug.cgi?id=542058

-->

<head>

  <title>Test for MediaQueryList (Bug 542058)</title>

  <script src="/tests/SimpleTest/SimpleTest.js"></script>

  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>

</head>

<body onload="run()">

<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=542058">Mozilla Bug 542058</a>

<iframe id="subdoc" src="about:blank"></iframe>

<div id="content" style="display:none"></div>

<pre id="test">

<script type="application/javascript">

/** Test for MediaQueryList (Bug 542058) **/

SimpleTest.waitForExplicitFinish();

function tick() {

  // MediaQueryList events are guaranteed to run before requestAnimationFrame

  // per spec.

  return new Promise(r => requestAnimationFrame(r));

async function run() {

  var iframe = document.getElementById("subdoc");

  var subdoc = iframe.contentDocument;

  var subwin = iframe.contentWindow;

  var subroot = subdoc.documentElement;

  var content_div = document.getElementById("content");

  content_div.style.font = "initial";

  var em_size =

    getComputedStyle(content_div).fontSize.match(/^(\d+)px$/)[1];

  var w = Math.floor(em_size * 9.3);

  var h = Math.floor(em_size * 4.2);

  iframe.style.width = w + "px";

  iframe.style.height = h + "px";

  subroot.offsetWidth; // flush layout

  await tick();

  function setup_mql(str) {

    var obj = {

      str: str,

      mql: subwin.matchMedia(str),

      notifyCount: 0,

      listener: function(event) {

                  ok(event instanceof subwin.MediaQueryListEvent,

                     "correct argument to listener: " + obj.str);

                  is(event.media, obj.mql.media,

                     "correct media in the event: " + obj.str);

                  is(event.target, obj.mql,

                     "correct target in the event: " + obj.str);

                  ++obj.notifyCount;

                  // Test the last match result only on odd

                  // notifications.

                  if (obj.notifyCount & 1) {

                    obj.lastOddMatchResult = event.target.matches;

    obj.mql.addListener(obj.listener);

    return obj;

  function finish_mql(obj) {

    obj.mql.removeListener(obj.listener);

  var w_exact_w = setup_mql("(width: " + w + "px)");

  var w_min_9em = setup_mql("(min-width : 9em)");

  var w_min_10em = setup_mql("(  min-width: 10em ) ");

  var w_max_9em = setup_mql("(max-width: 9em)");

  var w_max_10em = setup_mql("(max-width: 10em)");

  is(w_exact_w.mql.media, "(width: " + w + "px)", "serialization");

  is(w_min_9em.mql.media, "(min-width: 9em)", "serialization");

  is(w_min_10em.mql.media, "(min-width: 10em)", "serialization");

  is(w_max_9em.mql.media, "(max-width: 9em)", "serialization");

  is(w_max_10em.mql.media, "(max-width: 10em)", "serialization");

  function check_match(obj, expected, desc) {

    is(obj.mql.matches, expected,

       obj.str + " media query list .matches " + desc);

    if (obj.notifyCount & 1) { // odd notifications only

      is(obj.lastOddMatchResult, expected,

       obj.str + " media query list last notify result " + desc);

  function check_notify(obj, expected, desc) {

    is(obj.notifyCount, expected,

       obj.str + " media query list .notify count " + desc);

  check_match(w_exact_w, true, "initially");

  check_notify(w_exact_w, 0, "initially");

  check_match(w_min_9em, true, "initially");

  check_notify(w_min_9em, 0, "initially");

  check_match(w_min_10em, false, "initially");

  check_notify(w_min_10em, 0, "initially");

  check_match(w_max_9em, false, "initially");

  check_notify(w_max_9em, 0, "initially");

  check_match(w_max_10em, true, "initially");

  check_notify(w_max_10em, 0, "initially");

  var w2 = Math.floor(em_size * 10.3);

  iframe.style.width = w2 + "px";

  subroot.offsetWidth; // flush layout

  await tick();

  check_match(w_exact_w, false, "after width increase to around 10.3em");

  check_notify(w_exact_w, 1, "after width increase to around 10.3em");

  check_match(w_min_9em, true, "after width increase to around 10.3em");

  check_notify(w_min_9em, 0, "after width increase to around 10.3em");

  check_match(w_min_10em, true, "after width increase to around 10.3em");

  check_notify(w_min_10em, 1, "after width increase to around 10.3em");

  check_match(w_max_9em, false, "after width increase to around 10.3em");

  check_notify(w_max_9em, 0, "after width increase to around 10.3em");

  check_match(w_max_10em, false, "after width increase to around 10.3em");

  check_notify(w_max_10em, 1, "after width increase to around 10.3em");

  var w3 = w * 2;

  iframe.style.width = w3 + "px";

  subroot.offsetWidth; // flush layout

  await tick();

  check_match(w_exact_w, false, "after width double from original");

  check_notify(w_exact_w, 1, "after width double from original");

  check_match(w_min_9em, true, "after width double from original");

  check_notify(w_min_9em, 0, "after width double from original");

  check_match(w_min_10em, true, "after width double from original");

  check_notify(w_min_10em, 1, "after width double from original");

  check_match(w_max_9em, false, "after width double from original");

  check_notify(w_max_9em, 0, "after width double from original");

  check_match(w_max_10em, false, "after width double from original");

  check_notify(w_max_10em, 1, "after width double from original");

  SpecialPowers.setFullZoom(subwin, 2.0);

  subroot.offsetWidth; // flush layout

  await tick();

  check_match(w_exact_w, true, "after zoom");

  check_notify(w_exact_w, 2, "after zoom");

  check_match(w_min_9em, true, "after zoom");

  check_notify(w_min_9em, 0, "after zoom");

  check_match(w_min_10em, false, "after zoom");

  check_notify(w_min_10em, 2, "after zoom");

  check_match(w_max_9em, false, "after zoom");

  check_notify(w_max_9em, 0, "after zoom");

  check_match(w_max_10em, true, "after zoom");

  check_notify(w_max_10em, 2, "after zoom");

  SpecialPowers.setFullZoom(subwin, 1.0);

  await tick();

  finish_mql(w_exact_w);

  finish_mql(w_min_9em);

  finish_mql(w_min_10em);

  finish_mql(w_max_9em);

  finish_mql(w_max_10em);

  // Additional tests of listener mutation.

    let received = [];

    let received_mql = [];

    function listener1(event) {

      received.push(1);

      received_mql.push(event.target);

    function listener2(event) {

      received.push(2);

      received_mql.push(event.target);

    iframe.style.width = "200px";

    subroot.offsetWidth; // flush layout

    await tick();

    let mql = subwin.matchMedia("(min-width: 150px)");

    mql.addListener(listener1);

    mql.addListener(listener1);

    mql.addListener(listener2);

    is(JSON.stringify(received), "[]", "listeners before notification");

    iframe.style.width = "100px";

    subroot.offsetWidth; // flush layout

    await tick();

    is(JSON.stringify(received), "[1,2]", "duplicate listeners removed");

    received = [];

    mql.removeListener(listener1);

    iframe.style.width = "200px";

    subroot.offsetWidth; // flush layout

    await tick();

    is(JSON.stringify(received), "[2]", "listener removal");

    received = [];

    mql.addListener(listener1);

    iframe.style.width = "100px";

    subroot.offsetWidth; // flush layout

    await tick();

    is(JSON.stringify(received), "[2,1]", "listeners notified in order");

    received = [];

    mql.addListener(listener2);

    iframe.style.width = "200px";

    subroot.offsetWidth; // flush layout

    await tick();

    is(JSON.stringify(received), "[2,1]", "add of existing listener is no-op");

    received = [];

    mql.addListener(listener1);

    iframe.style.width = "100px";

    subroot.offsetWidth; // flush layout

    await tick();

    is(JSON.stringify(received), "[2,1]", "add of existing listener is no-op");

    mql.removeListener(listener2);

    received = [];

    received_mql = [];

    var mql2 = subwin.matchMedia("(min-width: 160px)");

    mql2.addListener(listener1);

    mql.addListener(listener2);

    iframe.style.width = "200px";

    subroot.offsetWidth; // flush layout

    await tick();

    // mql (1, 2), mql2 (1)

    is(JSON.stringify(received), "[1,2,1]",

       "notification of lists in order created");

    is(received_mql[0], mql,

       "notification of lists in order created");

    is(received_mql[1], mql,

       "notification of lists in order created");

    is(received_mql[2], mql2,

       "notification of lists in order created");

    received = [];

    received_mql = [];

    function removing_listener(event) {

      received.push(3);

      received_mql.push(event.target);

      event.target.removeListener(listener2);

      mql2.removeListener(listener1);

    mql.addListener(removing_listener);

    mql.removeListener(listener2);

    mql.addListener(listener2); // after removing_listener (3)

    iframe.style.width = "100px";

    subroot.offsetWidth; // flush layout

    await tick();

    // mql(1, 3)

    is(JSON.stringify(received), "[1,3]",

       "listeners still notified after removed if change was before");

    is(received_mql[0], mql,

       "notification order (removal tests)");

    is(received_mql[1], mql,

       "notification order (removal tests)");

    received = [];

    received_mql = [];

    iframe.style.width = "200px";

    subroot.offsetWidth; // flush layout

    await tick();

    // mql(1, 3)

    is(JSON.stringify(received), "[1,3]",

       "listeners not notified for changes after their removal");

    is(received_mql[0], mql,

       "notification order (removal tests)");

    is(received_mql[1], mql,

       "notification order (removal tests)");

  /* Bug 753777: test that things work in a freshly-created iframe */

    let newIframe = document.createElement("iframe");

    document.body.appendChild(newIframe);

    is(newIframe.contentWindow.matchMedia("all").matches, true,

       "matchMedia should work in newly-created iframe");

    is(newIframe.contentWindow.matchMedia("(min-width: 1px)").matches, true,

       "(min-width: 1px) should match in newly-created iframe");

    is(newIframe.contentWindow.matchMedia("(max-width: 1px)").matches, false,

       "(max-width: 1px) should not match in newly-created iframe");

    document.body.removeChild(newIframe);

  /* Bug 716751: listeners lost due to GC */

  var gc_received = [];

    let received = [];

    let listener1 = function(event) {

      gc_received.push(1);

    iframe.style.width = "200px";

    subroot.offsetWidth; // flush layout

    await tick();

    let mql = subwin.matchMedia("(min-width: 150px)");

    mql.addListener(listener1);

    is(JSON.stringify(gc_received), "[]", "GC test: before notification");

    iframe.style.width = "100px";

    subroot.offsetWidth; // flush layout

    await tick();

    is(JSON.stringify(gc_received), "[1]", "GC test: after notification 1");

    // Because of conservative GC, we need to go back to the event loop

    // to GC properly.

    setTimeout(step2, 0);

  async function step2() {

    SpecialPowers.DOMWindowUtils.garbageCollect();

    iframe.style.width = "200px";

    subroot.offsetWidth; // flush layout

    await tick();

    is(JSON.stringify(gc_received), "[1,1]", "GC test: after notification 2");

    bug1270626();

  /* Bug 1270626: listeners that throw exceptions */

  async function bug1270626() {

    var throwingListener = function(event) {

      throw "error";

    iframe.style.width = "200px";

    subroot.offsetWidth; // flush layout

    await tick();

    var mql = subwin.matchMedia("(min-width: 150px)");

    mql.addListener(throwingListener);

    SimpleTest.expectUncaughtException(true);

    is(SimpleTest.isExpectingUncaughtException(), true,

       "should be waiting for an uncaught exception");

    iframe.style.width = "100px";

    subroot.offsetWidth; // flush layout

    await tick();

    is(SimpleTest.isExpectingUncaughtException(), false,

       "should have gotten an uncaught exception");

    SimpleTest.finish();

</script>

</pre>

</body>

</html>