helper_zoomToFocusedInput_scroll.html

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<!DOCTYPE>

<html>

  <head>

  <title>Checking zoomToFocusedInput scrolls that focused input element is visible position</title>

  <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>

<div style="height: 8000px;">ABC</div>

<input id="input1">

<!-- Leave additional room below the element so it can be scrolled to the center -->

<div style="height: 1000px;">ABC</div>

<script type="application/javascript">

async function test() {

  is(0, window.scrollY, "scroll position starts at zero");

  input1.focus();

  await waitToClearOutAnyPotentialScrolls(window);

  isnot(0, window.scrollY, "scroll position isn't top");

  window.scrollTo(0, 0);

  await waitToClearOutAnyPotentialScrolls(window);

  is(0, window.scrollY, "scroll position is top");

  let utils = SpecialPowers.getDOMWindowUtils(window);

  let transformEndPromise = promiseTransformEnd();

  utils.zoomToFocusedInput();

  isnot(0, window.scrollY, "scroll position isn't top");

  // Test for bug 1669588: check that the zoom animation did not get

  // cancelled by a main thread scroll position update triggered by

  // the ScrollContentIntoView() operation performed by zoomToFocusedInput().

  await transformEndPromise;

  await promiseApzFlushedRepaints();

  // Check that the zoom animation performed additional scrolling

  // beyond the ScrollContentIntoView(). The ScrollContentIntoView()

  // just scrolls enough to bring `input1` into the viewport, while

  // the zoom animation will scroll further to center it. To

  // distinguish the two cases, check that we scrolled enough that

  // the element's top is above the middle of the visual viewport.

  let inputTop = input1.getBoundingClientRect().top;

  inputTop -= window.visualViewport.offsetTop;

  ok(inputTop < (window.visualViewport.height / 2),

     "input was scrolled at least as far as the middle of the viewport");

waitUntilApzStable().then(test).then(subtestDone, subtestFailed);

</script>

</body>

</html>