helper_visual_smooth_scroll.html

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<!DOCTYPE HTML>

<html>

<head>

  <meta charset="utf-8">

  <meta name="viewport" content="width=device-width, minimum-scale=1.0">

  <title>Tests that the (internal) visual smooth scrolling API is not restricted to the layout scroll range</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>

  <style>

    div {

      position: absolute;

  </style>

</head>

<body>

  <div style="width: 100%; height: 200%; background-color: green"></div>

  <div style="width: 100%; height: 100%; background-color: blue"></div>

  <script type="application/javascript">

    const utils = SpecialPowers.getDOMWindowUtils(window);

    async function test() {

      // Pick a destination to scroll to that's outside the layout scroll range

      // but within the visual scroll range.

      const destY = window.scrollMaxY + 100;

      // Register a TransformEnd observer so we can tell when the smooth scroll

      // animation stops.

      let transformEndPromise = promiseTransformEnd();

      // Use scrollToVisual() to smooth-scroll to the destination.

      utils.scrollToVisual(0, destY, utils.UPDATE_TYPE_MAIN_THREAD,

                           utils.SCROLL_MODE_SMOOTH);

      // Wait for the TransformEnd.

      await transformEndPromise;

      // Give scroll offsets a chance to sync.

      await promiseApzFlushedRepaints();

      // Check that the visual viewport scrolled to the desired destination.

      is(visualViewport.pageTop, destY,

         "The visual viewport should have scrolled past the layout scroll range");

    SpecialPowers.getDOMWindowUtils(window).setResolutionAndScaleTo(2.0);

    waitUntilApzStable()

    .then(test)

    .then(subtestDone, subtestFailed);

  </script>

</body>

</html>