Quellcode-Bibliothek test_texttrackcue.html Sprache: HTML

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

<!DOCTYPE HTML>
<html>
<head>
  <title>Test for Bug 833386 - HTMLTrackElement</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" src="seek.webm" preload="metadata">
  <track src="basic.vtt" kind="subtitles" id="default" default>
</video>
<script type="text/javascript">
/**
* This test is used to test the VTTCue's different behaviors and check whether
* cues would be activatived correctly during video playback.
*/
var video = document.getElementById("v");
var trackElement = document.getElementById("default");

async function runTest() {
  await waitUntiTrackLoaded();
  checkCueDefinition();
  checkFirstCueParsedContent();
  checkCueStartTimeAndEndtime();
  checkCueSizeAndPosition();
  checkCueSnapToLines();
  checkCueAlignmentAndWritingDirection();
  checkCueLine();
  checkCreatingNewCue();
  checkRemoveNonExistCue();
  checkActiveCues();
  checkCueRegion();
  await checkCActiveCuesDuringVideoPlaying();
  SimpleTest.finish();
}

SimpleTest.waitForExplicitFinish();

runTest();

/**
* The following are test helper functions.
*/
async function waitUntiTrackLoaded() {
  if (trackElement.readyState != 2) {
    info(`wait until the track finishes loading`);
    await once(trackElement, "load");
  }
  is(trackElement.readyState, 2, "Track::ReadyState should be set to LOADED.");
  is(trackElement.track.cues.length, 6, "Cue list length should be 6.");
}

function checkCueDefinition() {
  // Check that the typedef of TextTrackCue works in Gecko.
  isnot(window.TextTrackCue, undefined, "TextTrackCue should be defined.");
  isnot(window.VTTCue, undefined, "VTTCue should be defined.");
}

function checkFirstCueParsedContent() {
  // Check if first cue was parsed correctly.
  const cue = trackElement.track.cues[0];
  ok(cue instanceof TextTrackCue, "Cue should be an instanceof TextTrackCue.");
  ok(cue instanceof VTTCue, "Cue should be an instanceof VTTCue.");
  is(cue.id, "1", "Cue's ID should be 1.");
  is(cue.startTime, 0.5, "Cue's start time should be 0.5.");
  is(cue.endTime, 0.7, "Cue's end time should be 0.7.");
  is(cue.pauseOnExit, false, "Cue's pause on exit flag should be false.");
  is(cue.text, "This", "Cue's text should be set correctly.");
  is(cue.track, trackElement.track, "Cue's track should be defined.");
  cue.track = null;
  isnot(cue.track, null, "Cue's track should not be able to be set.");
}

function checkCueStartTimeAndEndtime() {
  const cueList = trackElement.track.cues;
  // Check that all cue times were not rounded
  is(cueList[1].startTime, 1.2, "Second cue's start time should be 1.2.");
  is(cueList[1].endTime, 2.4, "Second cue's end time should be 2.4.");
  is(cueList[2].startTime, 2, "Third cue's start time should be 2.");
  is(cueList[2].endTime, 3.5, "Third cue's end time should be 3.5.");
  is(cueList[3].startTime, 2.71, "Fourth cue's start time should be 2.71.");
  is(cueList[3].endTime, 2.91, "Fourth cue's end time should be 2.91.");
  is(cueList[4].startTime, 3.217, "Fifth cue's start time should be 3.217.");
  is(cueList[4].endTime, 3.989, "Fifth cue's end time should be 3.989.");
  is(cueList[5].startTime, 3.217, "Sixth cue's start time should be 3.217.");
  is(cueList[5].endTime, 3.989, "Sixth cue's end time should be 3.989.");

  // Check that Cue setters are working correctly.
  const cue = trackElement.track.cues[0];
  cue.id = "Cue 01";
  is(cue.id, "Cue 01", "Cue's ID should be 'Cue 01'.");
  cue.startTime = 0.51;
  is(cue.startTime, 0.51, "Cue's start time should be 0.51.");
  cue.endTime = 0.71;
  is(cue.endTime, 0.71, "Cue's end time should be 0.71.");
  cue.pauseOnExit = true;
  is(cue.pauseOnExit, true, "Cue's pause on exit flag should be true.");
  video.addEventListener("pause", function() {
    video.play();
  }, {once: true});
}

function checkCueSizeAndPosition() {
  function checkPercentageValue(prop, initialVal) {
    ok(prop in cue, prop + " should be a property on VTTCue.");
    cue[prop] = initialVal;
    is(cue[prop], initialVal, `Cue's ${prop} should initially be ${initialVal}`);
    [ 101, -1 ].forEach(function(val) {
      let exceptionHappened = false;
      try {
        cue[prop] = val;
      } catch(e) {
        exceptionHappened = true;
        is(e.name, "IndexSizeError", "Should have thrown IndexSizeError.");
      }
      ok(exceptionHappened, "Exception should have happened.");
    });
  }

  const cue = trackElement.track.cues[0];
  checkPercentageValue("size", 100.0);
  cue.size = 50.5;
  is(cue.size, 50.5, "Cue's size should be 50.5.")

  // Check cue.position
  checkPercentageValue("position", "auto");
  cue.position = 50.5;
  is(cue.position, 50.5, "Cue's position value should now be 50.5.");
}

function checkCueSnapToLines() {
  const cue = trackElement.track.cues[0];
  ok(cue.snapToLines, "Cue's snapToLines should be set by set.");
  cue.snapToLines = false;
  ok(!cue.snapToLines, "Cue's snapToLines should not be set.");
}

function checkCueAlignmentAndWritingDirection() {
  function checkEnumValue(prop, initialVal, acceptedValues) {
    ok(prop in cue, `${prop} should be a property on VTTCue.`);
    is(cue[prop], initialVal, `Cue's ${prop} should be ${initialVal}`);
    cue[prop] = "bogus";
    is(cue[prop], initialVal, `Cue's ${prop} should be ${initialVal}`);
    acceptedValues.forEach(function(val) {
      cue[prop] = val;
      is(cue[prop], val, `Cue's ${prop} should be ${val}`);
      if (typeof val === "string") {
        cue[prop] = val.toUpperCase();
        is(cue[prop], val, `Cue's ${prop} should be ${val}`);
      }
    });
  }

  const cue = trackElement.track.cues[0];
  checkEnumValue("align", "center", [ "start", "left", "center", "right", "end" ]);
  checkEnumValue("lineAlign", "start", [ "start", "center", "end" ]);
  checkEnumValue("vertical", "", [ "", "lr", "rl" ]);

  cue.lineAlign = "center";
  is(cue.lineAlign, "center", "Cue's line align should be center.");
  cue.lineAlign = "START";
  is(cue.lineAlign, "center", "Cue's line align should be center.");
  cue.lineAlign = "end";
  is(cue.lineAlign, "end", "Cue's line align should be end.");

  // Check that cue position align works properly
  is(cue.positionAlign, "auto", "Cue's default position alignment should be auto.");

  cue.positionAlign = "line-left";
  is(cue.positionAlign, "line-left", "Cue's position align should be line-left.");
  cue.positionAlign = "auto";
  is(cue.positionAlign, "auto", "Cue's position align should be auto.");
  cue.positionAlign = "line-right";
  is(cue.positionAlign, "line-right", "Cue's position align should be line-right.");
}

function checkCueLine() {
  const cue = trackElement.track.cues[0];
  // Check cue.line
  is(cue.line, "auto", "Cue's line value should initially be auto.");
  cue.line = 0.5;
  is(cue.line, 0.5, "Cue's line value should now be 0.5.");
  cue.line = "auto";
  is(cue.line, "auto", "Cue's line value should now be auto.");
}

function checkCreatingNewCue() {
  const cueList = trackElement.track.cues;

  // Check that we can create and add new VTTCues
  let vttCue = new VTTCue(3.999, 4, "foo");
  is(vttCue.track, null, "Cue's track should be null.");
  trackElement.track.addCue(vttCue);
  is(vttCue.track, trackElement.track, "Cue's track should be defined.");
  is(cueList.length, 7, "Cue list length should now be 7.");

  // Check that new VTTCue was added correctly
  let cue = cueList[6];
  is(cue.startTime, 3.999, "Cue's start time should be 3.999.");
  is(cue.endTime, 4, "Cue's end time should be 4.");
  is(cue.text, "foo", "Cue's text should be foo.");

  // Adding the same cue again should not increase the cue count.
  trackElement.track.addCue(vttCue);
  is(cueList.length, 7, "Cue list length should be 7.");

  // Check that we are able to remove cues.
  trackElement.track.removeCue(cue);
  is(cueList.length, 6, "Cue list length should be 6.");
}

function checkRemoveNonExistCue() {
  is(trackElement.track.cues.length, 6, "Cue list length should be 6.");
  let exceptionHappened = false;
  try {
    // We should not be able to remove a cue that is not in the list.
    trackElement.track.removeCue(new VTTCue(1, 2, "foo"));
  } catch (e) {
    // "NotFoundError" should be thrown when trying to remove a cue that is
    // not in the list.
    is(e.name, "NotFoundError", "Should have thrown NotFoundError.");
    exceptionHappened = true;
  }
  // If this is false then we did not throw an error and probably removed a cue
  // when we shouln't have.
  ok(exceptionHappened, "Exception should have happened.");
  is(trackElement.track.cues.length, 6, "Cue list length should still be 6.");
}

function checkActiveCues() {
  video.currentTime = 2;
  isnot(trackElement.track.activeCues, null);

  trackElement.track.mode = "disabled";
  is(trackElement.track.activeCues, null, "No active cue when track is disabled.");
  trackElement.track.mode = "showing";
}

function checkCueRegion() {
  let regionInfo = [
    { lines: 2, width: 30 },
    { lines: 4, width: 20 },
    { lines: 2, width: 30 }
  ];

  for (let i = 0; i < regionInfo.length; i++) {
    let cue = trackElement.track.cues[i];
    isnot(cue.region, null, `Cue at ${i} should have a region.`);
    for (let key in regionInfo[i]) {
      is(cue.region[key], regionInfo[i][key],
         `Region should have a ${key} property with a value of ${regionInfo[i][key]}`);
    }
  }
}

async function checkCActiveCuesDuringVideoPlaying() {
  // Test TextTrack::ActiveCues.
  let cueInfo = [
    { startTime: 0.51, endTime: 0.71, ids: ["Cue 01"] },
    { startTime: 0.72, endTime: 1.19, ids: [] },
    { startTime: 1.2, endTime: 1.9, ids: [2] },
    { startTime: 2, endTime: 2.4, ids: [2, 2.5] },
    { startTime: 2.41, endTime: 2.70, ids: [2.5] },
    { startTime: 2.71, endTime: 2.91, ids: [2.5, 3] },
    { startTime: 2.92, endTime: 3.216, ids: [2.5] },
    { startTime: 3.217, endTime: 3.5, ids: [2.5, 4, 5] },
    { startTime: 3.51, endTime: 3.989, ids: [4, 5] },
    { startTime: 3.99, endTime: 4, ids: [] }
  ];

  video.addEventListener("timeupdate", function() {
    let activeCues = trackElement.track.activeCues,
        playbackTime = video.currentTime;

    for (let i = 0; i < cueInfo.length; i++) {
      let cue = cueInfo[i];
      if (playbackTime >= cue.startTime && playbackTime < cue.endTime) {
        is(activeCues.length, cue.ids.length, `There should be ${cue.ids.length} currently active cue(s).`);
        for (let j = 0; j < cue.ids.length; j++) {
          isnot(activeCues.getCueById(cue.ids[j]), undefined,
                `The cue with ID ${cue.ids[j]} should be active.`);
        }
        break;
      }
    }
  });

  info(`start video from 0s.`);
  video.currentTime = 0;
  video.play();
  await once(video, "playing");
  info(`video starts playing.`);
  await once(video, "ended");
}

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

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