helper_scrollframe_activation_on_load.html

<!DOCTYPE HTML>

<html id="root-element">

<!--

https://bugzilla.mozilla.org/show_bug.cgi?id=1151663

-->

<head>

  <meta charset="utf-8">

  <title>Test for Bug 1151663, helper page</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>

  <script type="application/javascript">

    // In this test we have a simple page which is scrollable, with a

    // scrollable <div> which is also scrollable. We test that the

    // <div> does not get an initial APZC, since primary scrollable

    // frame is the page's root scroll frame.

    function test() {

      // Reconstruct the APZC tree structure in the last paint.

      var apzcTree = getLastApzcTree();

      // The apzc tree for this page should consist of a single root APZC,

      // which either is the RCD with no child APZCs (e10s/B2G case) or has a

      // single child APZC which is for the RCD (fennec case). If we activate

      // all scrollframes then we expect there to be a child.

      var rcd = findRcdNode(apzcTree);

      ok(rcd != null, "found the RCD node");

      // For reference when I run this test locally when I modified it to

      // handle activateAllScrollFrames I got the following values:

      // rootElement.clientWidth 1280

      // rootElement.clientHeight 863

      // rootDisplayPort: {"x":0,"y":0,"w":1280,"h":3200} non wr

      // rootDisplayPort: {"x":0,"y":0,"w":1280,"h":1792} wr

      // At this time activateAllScrollFrames is only active with wr fission:

      // div displayPort: {"x":0,"y":0,"w":50,"h":50} wr fission

      // theDiv.clientWidth: 50 wr fission

      // theDiv.clientHeight: 50 wr fission

      let config = getHitTestConfig();

      let heightMultiplier = SpecialPowers.getCharPref("apz.y_stationary_size_multiplier");

      // The effective height multiplier can be reduced for alignment reasons.

      // The reduction should be no more than a factor of two.

      heightMultiplier /= 2;

      info("effective displayport height multipler is " + heightMultiplier);

      let rootDisplayPort = getLastContentDisplayportFor('root-element');

      let rootElement = document.getElementById('root-element');

      info("rootDisplayPort is " + JSON.stringify(rootDisplayPort));

      info("rootElement.clientWidth " + rootElement.clientWidth +

           " rootElement.clientHeight " + rootElement.clientHeight);

      ok(rootDisplayPort.width >= rootElement.clientWidth, "rootDisplayPort should be at least as wide as page");

      ok(rootDisplayPort.height >= heightMultiplier * rootElement.clientHeight,

        "rootDisplayPort should be at least as tall as page times heightMultiplier");

      let displayPort = getLastContentDisplayportFor('thediv');

      if (config.activateAllScrollFrames) {

        is(rcd.children.length, 1, "expected one child on the RCD");

        let theDiv = document.getElementById("thediv");

        ok(displayPort != null, "should have displayPort");

        info("div displayPort: " + JSON.stringify(displayPort));

        info("div width: " + theDiv.clientWidth);

        info("div height: " + theDiv.clientHeight);

        ok(displayPort.width <= theDiv.clientWidth + 1, "displayPort w should have empty margins");

        ok(displayPort.height <= theDiv.clientHeight + 1, "displayPort h should have empty margins");

      } else {

        is(rcd.children.length, 0, "expected no children on the RCD");

        ok(displayPort == null, "should not have displayPort");

    waitUntilApzStable()

    .then(forceLayerTreeToCompositor)

    .then(test)

    .then(subtestDone, subtestFailed);

  </script>

</head>

<body>

  <a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1151663">Mozilla Bug 1151663</a>

  <div id="thediv" style="height: 50px; width: 50px; overflow: scroll">

    <!-- Put enough content into the subframe to make it have a nonzero scroll range -->

    <div style="height: 100px; width: 50px"></div>

  </div>

  <!-- Put enough content into the page to make it have a nonzero scroll range -->

  <div style="height: 5000px"></div>

</body>

</html>