Quelle helper_bug1719855.html Sprache: HTML

products/sources/formale Sprachen/C/Firefox/gfx/layers/apz/test/mochitest/helper_bug1719855.html

<!DOCTYPE HTML>
<html>
<head>
  <title>preventDefault() in touchmove prevents scrolling even after a long tap event</title>
  <meta name="viewport" content="width=device-width,initial-scale=1">
  <script type="application/javascript" src="apz_test_utils.js"></script>
  <script type="application/javascript" src="apz_test_native_event_utils.js"></script>
  <script src="/tests/SimpleTest/paint_listener.js"></script>
</head>
<body>
  
  <a href="about:blank" style="position:absolute; top: 100px; left: 100px;">about:blank</a>
  
  <div style="height: 200vh;"></div>
</body>
<script type="application/javascript">

const searchParams = new URLSearchParams(location.search);

const isAndroid = getPlatform() == "android";

async function test() {
  // Setup a touchmove event listener where we do preventDefault() to prevent
  // scrolling.
  let touchmoveCount = 0;
  document.scrollingElement.addEventListener("touchmove", e => {
    info("Got a touchmove");
    touchmoveCount++;
    e.preventDefault();
  }, { passive: false });

  // Setup touchstart/touchend event listeners just for debugging purpose.
  document.scrollingElement.addEventListener("touchstart", () => {
    info("Got a touchstart");
  }, { passive: false });
  document.scrollingElement.addEventListener("touchend", () => {
    info("Got a touchend");
  }, { passive: false });

  window.addEventListener("scroll", () => {
    ok(false, "The content should never be scrolled");
  });

  let contextmenuPromise = promiseOneEvent(window, "contextmenu", e => {
    if (searchParams.get("prevent") == "contextmenu") {
      e.preventDefault();
    }
    return true;
  });

  // Ensure that the setup-ed information has reached to APZ.
  await promiseApzFlushedRepaints();

  // Start a touch on the anchor.
  await synthesizeNativeTouch(window, 100, 100, SpecialPowers.DOMWindowUtils.TOUCH_CONTACT);

  // And wait for a contextmenu event (i.e. a long-tap event)
  await contextmenuPromise;

  // Extend apz.content_response_timeout to avoid timeout on waiting the content
  // response.
  await SpecialPowers.pushPrefEnv({ set: [["apz.content_response_timeout", 40000]] });

  // Make sure the touch start does nothing.
  is(window.scrollY, 0, "The original scroll position is zero");

  // Try to scroll down by touch moving.
  for (let i = 1; i < 50; i++) {
    synthesizeNativeTouch(window, 100, 100 - i, SpecialPowers.DOMWindowUtils.TOUCH_CONTACT);
  }
  await synthesizeNativeTouch(window, 100, 50, SpecialPowers.DOMWindowUtils.TOUCH_REMOVE);

  await waitToClearOutAnyPotentialScrolls();

  if (searchParams.get("prevent") == "contextmenu") {
    ok(touchmoveCount > 0, "There should be at least one touch-move event");
  } else {
    is(touchmoveCount, 0, "There should be no touch-move event when the context menu opened");
  }
  is(window.scrollY, 0, "The scroll position should stay the original position");

  if (searchParams.get("prevent") != "contextmenu") {
    // If we've opened the context menu, close it.
    await closeContextMenu();
  }
}

if (getPlatform() == "windows") {
  // On Windows every context menu on touch screens opens __after__ lifting the
  // finger.
  ok(true, "Test doesn't need to run on Windows");
  subtestDone();
} else {
  waitUntilApzStable()
  .then(test)
  .then(subtestDone, subtestFailed);
}

</script>
</html>

Messung V0.5

¤ Dauer der Verarbeitung: 0.22 Sekunden (vorverarbeitet) ¤

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