Quelle helper_bug1839095.html

Sprache: HTML

products/Sources/formale Sprachen/C/Firefox/gfx/layers/apz/test/mochitest/helper_bug1839095.html

<!DOCTYPE html>
<html>
<meta name="viewport" content="width=device-width; initial-scale=1.0">
<title>Test that preventDefault() in a dynamically-added touchmove listener prevents scrolling</title>
<script src="/tests/SimpleTest/SimpleTest.js"></script>
<script src="/tests/SimpleTest/paint_listener.js"></script>
<script src="apz_test_utils.js"></script>
<script src="apz_test_native_event_utils.js"></script>
<div style="height: 500vh;"></div>
<script>
async function test() {
  // A passive touchstart listener dynamically adds an active touchmove
  // listener that calls preventDefault(). APZ must re-hit-test on the first
  // touchmove to discover the new listener and wait for a content response,
  // so that the preventDefault() is respected and scrolling is suppressed.
  const touchstartPromise = new Promise(resolve => {
    window.addEventListener("touchstart", () => {
      document.addEventListener("touchmove", e => {
        e.preventDefault();
      }, { passive: false, once: true });
      resolve();
    }, { passive: true, once: true });
  });

  await promiseApzFlushedRepaints();

  await synthesizeNativeTouch(window, 100, 200,
                              SpecialPowers.DOMWindowUtils.TOUCH_CONTACT);
  await touchstartPromise;

  // Though as of now fast-path notifiction explicitly schedules a paint,
  // it will not in future, so wait two requestAnimationFrames rather than
  // waiting for a paint.
  await promiseFrame();
  await promiseFrame();

  await synthesizeNativeTouch(window, 100, 150,
                              SpecialPowers.DOMWindowUtils.TOUCH_CONTACT);
  await synthesizeNativeTouch(window, 100, 100,
                              SpecialPowers.DOMWindowUtils.TOUCH_CONTACT);
  await synthesizeNativeTouch(window, 100, 100,
                              SpecialPowers.DOMWindowUtils.TOUCH_REMOVE);

  await promiseApzFlushedRepaints();

  is(window.scrollY, 0, "Should not have scrolled");
}

waitUntilApzStable()
.then(test)
.then(subtestDone, subtestFailed);
</script>
</html>

Messung V0.5 in Prozent

¤ Dauer der Verarbeitung: 0.12 Sekunden (vorverarbeitet am 2026-08-26) ¤

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