helper_doubletap_zoom_htmlelement.html

Enable keyboard shortcuts

<!DOCTYPE HTML>

<html>

<head>

  <meta charset="utf-8">

  <meta name="viewport" content="width=2100"/>

  <title>Check that double tapping on a scrollbar does not scroll to top</title>

  <script type="application/javascript" src="apz_test_native_event_utils.js"></script>

  <script type="application/javascript" src="apz_test_utils.js"></script>

  <script src="/tests/SimpleTest/paint_listener.js"></script>

  <script type="application/javascript">

async function test() {

  let useTouchpad = (location.search == "?touchpad");

  var resolution = await getResolution();

  var start_resolution = resolution;

  ok(resolution > 0,

     "The initial_resolution is " + resolution + ", which is some sane value");

  // Check that double-tapping once zooms in

  await doubleTapOn(document.getElementById("target"), 10, 10, useTouchpad);

  var prev_resolution = resolution;

  resolution = await getResolution();

  ok(resolution > prev_resolution, "The first double-tap has increased the resolution to " + resolution);

  // instant scroll to the middle of the page

  window.scrollTo({

    top: 4 * window.innerHeight,

    left: 0,

    behavior: 'auto'

});

  await promiseApzFlushedRepaints();

  let prevScrollX = window.scrollX;

  let prevScrollY = window.scrollY;

  ok(3.9 * window.innerHeight < window.scrollY && window.scrollY < 4.1 * window.innerHeight,

    "scrollY looks good");

  // Check that double-tapping on the bottom scrollbar does not scroll us to the top

  // Need to divide by resolution because the coords are assumed to be inside the resolution

  await doubleTapOn(window, (window.innerWidth/2)/resolution, (window.innerHeight - 5)/resolution, useTouchpad);

  prev_resolution = resolution;

  resolution = await getResolution();

  ok(resolution < prev_resolution, "The second double-tap has decreased the resolution to " + resolution);

  ok(resolution == start_resolution, "The second double-tap has decreased the resolution to the start to " + resolution);

  info("prevscroll " + prevScrollX + " " + prevScrollY + "\n");

  info("window.scroll " + window.scrollX + " " + window.scrollY + "\n");

  ok(0.88*prevScrollY < window.scrollY && window.scrollY < prevScrollY*1.12, "scroll y didn't change by much");

waitUntilApzStable()

.then(test)

.then(subtestDone, subtestFailed);

  </script>

  <style type="text/css">

    .spacer {

      background-color: #eee;

      width: 10px;

      height: 800vh;

</style>

</head>

<body>

<div id="target" style="width: 100px; height: 100px; background: red;">

</div>

<div class="spacer">

</div>

</body>

</html>