Quelle test_texttrack.html Sprache: HTML

products/Sources/formale Sprachen/C/Firefox/dom/media/webvtt/test/mochitest/test_texttrack.html

<!DOCTYPE HTML>
<html>
<head>
  <title>Test for Bug 833386 - TextTrackList</title>
  <script src="/tests/SimpleTest/SimpleTest.js"></script>
  <script type="text/javascript" src="manifest.js"></script>
  <link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
</head>
<body>
<video id="v">
<script type="text/javascript">
/**
* This test is used to check different things.
* (1) the default value of track element's attributes
* (2) readonly attributes can't be modifted
* (3) the order of tracks in the media element's track list
*/
var enabledTrackElement = null;

async function runTest() {
  addFourTextTrackElementsToVideo();
  startLoadingVideo();
  await waitUntilEnableTrackLoaded();
  checkTracksStatus();
  SimpleTest.finish();
}

SimpleTest.waitForExplicitFinish();
onload = runTest;

/**
* The following are test helper functions.
*/
function addFourTextTrackElementsToVideo() {
  let video = document.getElementById("v");
  isnot(video.textTracks, undefined,
        "HTMLMediaElement::TextTrack() property should be available.")

  let trackList = video.textTracks;
  is(trackList.length, 0, "Length should be 0.");

  ok(typeof video.addTextTrack == "function",
     "HTMLMediaElement::AddTextTrack() function should be available.")

  // Insert some tracks in an order that is not sorted, we will test if they
  // are sorted later.
  info(`- Add a track element with label 'third' -`);
  video.addTextTrack("subtitles", "third", "en-CA");
  is(trackList.length, 1, "Length should be 1.");

  let textTrack = video.textTracks[0];
  checkAttributesDefaultValue(textTrack);
  checkTextTrackMode(textTrack);
  checkReadOnlyAttributes(textTrack);

  info(`- Add a track element with label 'first' -`);
  let trackOne = document.createElement("track");
  video.appendChild(trackOne);
  trackOne.label = "first";
  trackOne.src = "basic.vtt";
  trackOne.default = true;
  trackOne.id = "2";
  // The automatic track selection would choose the first track element with
  // `default` attribute, so this track would be enable later.
  enabledTrackElement = trackOne;

  info(`- Add a track element with label 'fourth' -`);
  video.addTextTrack("subtitles", "fourth", "en-CA");

  info(`- Add a track element with label 'second' -`);
  let trackTwo = document.createElement("track");
  video.appendChild(trackTwo);
  trackTwo.label = "second";
  trackTwo.src = "basic.vtt";
  // Although this track has `default` attribute as well, it won't be enable by
  // the automatic track selection because it's not the first default track in
  // the media element's track list.
  trackTwo.default = true;
}

function checkAttributesDefaultValue(track) {
  is(track.label, "third", "Label should be set to third.");
  is(track.language, "en-CA", "Language should be en-CA.");
  is(track.kind, "subtitles", "Default kind should be subtitles.");
  is(track.mode, "hidden", "Default mode should be hidden.");
}

function checkTextTrackMode(track) {
  // Mode should not allow a bogus value.
  track.mode = 'bogus';
  is(track.mode, 'hidden', "Mode should be not allow a bogus value.");

  // Should allow all these values for mode.
  changeTextTrackMode("showing");
  changeTextTrackMode("disabled");
  changeTextTrackMode("hidden");

  function changeTextTrackMode(mode) {
    track.mode = mode;
    is(track.mode, mode, `Mode should allow \"${mode}\"`);
  }
}

function checkReadOnlyAttributes(track) {
  // All below are read-only properties and so should not allow setting.
  track.label = "French subtitles";
  is(track.label, "third", "Label is read-only so should still be \"label\".");
  track.language = "en";
  is(track.language, "en-CA", "Language is read-only so should still be \"en-CA\".");
  track.kind = "captions";
  is(track.kind, "subtitles", "Kind is read-only so should still be \"subtitles\"");
}

function startLoadingVideo() {
  let video = document.getElementById("v");
  video.src = "seek.webm";
  video.preload = "metadata";
}

async function waitUntilEnableTrackLoaded() {
  info(`wait until the enabled track finishes loading`);
  await once(enabledTrackElement, "load");
  is(enabledTrackElement.readyState, 2, "Track::ReadyState should be set to LOADED.");
}

function checkTracksStatus() {
  // We're testing two things here,
  // (1) the tracks created from a track element have a default mode 'disabled'
  // and tracks created from 'addTextTrack' method have a default
  // mode of 'hidden'.
  // (2) we're testing that the tracks are sorted properly. For the tracks to
  // be sorted the first two tracks, added through a TrackElement, must occupy
  // the first two indexes in their TrackElement tree order. The second two
  // tracks, added through the 'addTextTrack' method, will occupy the last two
  // indexes in the order that they were added in.
  let trackData = [
    { label: "first", mode: "showing", id: "2" },
    { label: "second", mode: "disabled", id: "" },
    { label: "third", mode: "hidden", id: "" },
    { label: "fourth", mode: "hidden", id: "" }
  ];
  let video = document.getElementById("v");
  is(video.textTracks.length, trackData.length,
     `TextTracks length should be ${trackData.length}`);
  for (let i = 0; i < trackData.length; i++) {
    let track = video.textTracks[i];
    isnot(track, null, `Video should have a text track at index ${i}`);
    let info = trackData[i];
    for (let key in info) {
      is(track[key], info[key],
         `Track at index ${i} should have a '${key}' property with a value of '${info[key]}'.`);
    }
  }
}

</script>
</body>
</html>

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