Quelle helper_check_dp_size.html Sprache: HTML

products/sources/formale Sprachen/C/Firefox/gfx/layers/apz/test/mochitest/helper_check_dp_size.html

<!DOCTYPE HTML>
<html>

<head>
  <meta charset="utf-8">
  <title>Test for Bug 1689492, 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">

    // -------------------------------------------------------------------
    // Infrastructure to get the test assertions to run at the right time.
    // -------------------------------------------------------------------
    var SimpleTest = window.opener.SimpleTest;

    // --------------------------------------------------------------------
    // In this test we have a scrollable root scroll frame (not needed, but
    // more representative), a scrollable outer div, and a scrollable inner
    // div. We scroll the inner div, and test that it gets a non-zero
    // display port (not the main reason for the test, that should already
    // work, but it's a good sanity check), and then check that the outer
    // div gets a display port and (here's the important part of the test)
    // that that display port has zero margins, ie it's relatively close to the
    // dimensions of the outer div (it can't be exact because we align display
    // ports). This tests a regression where the outer div would get non-zero
    // margin display port even though it had never been scrolled (it still
    // needs a display port because it has a scrollable child). We run the
    // test several times with different sized outerdiv.
    // --------------------------------------------------------------------

    function createDivs(outerwidth, outerheight) {
      let outerdiv = document.createElement("div");
      outerdiv.id = "outerdiv";
      outerdiv.style.width = outerwidth + "px";
      outerdiv.style.height = outerheight + "px";
      outerdiv.style.overflow = "scroll";

      let innerdiv = document.createElement("div");
      innerdiv.id = "innerdiv";
      innerdiv.style.width = "25px";
      innerdiv.style.height = "25px";
      innerdiv.style.overflow = "scroll";
      outerdiv.appendChild(innerdiv);

      let innerspacer = document.createElement("div");
      innerspacer.style.width = "25px";
      innerspacer.style.height = "100px";
      innerdiv.appendChild(innerspacer);

      let outerspacer = document.createElement("div");
      outerspacer.style.width = "50px";
      outerspacer.style.height = "10000px";
      outerdiv.appendChild(outerspacer);

      let theplace = document.getElementById("theplace");
      theplace.parentNode.insertBefore(outerdiv, theplace.nextSibling);
    }

    async function testOne(theheight, allowedscalefactor, outputprefix) {
      createDivs(50, theheight);
      // flush layout
      document.documentElement.getBoundingClientRect();
      await promiseApzFlushedRepaints();

      document.getElementById("innerdiv").scrollTop = "10px";

      // Activate the inner div.
      await promiseMoveMouseAndScrollWheelOver(document.getElementById("innerdiv"), 0, 10);

      await promiseApzFlushedRepaints();

      let innerdp = getLastContentDisplayportFor("innerdiv");
      ok(innerdp.height > 30, outputprefix + " innerdiv display port should be larger than innerdiv");

      let outerdp = getLastContentDisplayportFor("outerdiv");
      is(outerdp.x, 0, outputprefix + " outerdiv display port should be relatively bounded x");
      is(outerdp.y, 0, outputprefix + " outerdiv display port should be relatively bounded y");
      ok(outerdp.width <= 50, outputprefix + " outerdiv display port should relatively bounded w");
      ok(outerdp.height < theheight * allowedscalefactor, outputprefix + " outerdiv display port should be relatively bounded h");

      ok(true, "innerdp " + JSON.stringify(innerdp));
      ok(true, "outerdp " + JSON.stringify(outerdp));

      document.getElementById("outerdiv").remove();
    }

    async function test() {
      // We test a variety of scroll frame heights.
      // The first argument of testOne is the scroll frame height.
      // The second argument is the allowed scale factor of scroll frame height
      // to display port height.
      // In the comment following each line we record the values of the display
      // port height at the time of writing the test in both the good (ie with
      // the bug this test is testing fixed), and bad (before the bug this
      // test is testing fixed) cases. These values can obviously be different,
      // but it gives a good idea that the good and bad values are far apart so
      // this test should be robust, and provides good context in the future if
      // this test starts failing.
      await testOne( 50, 5.2, "(height 50)"); // good 256, bad 256
      await testOne(128, 2.1, "(height128)"); // good 256, bad 512
      await testOne(200, 2.0, "(height200)"); // good 384, bad 768
      await testOne(256, 1.6, "(height256)"); // good 384, bad 768
      await testOne(329, 1.6, "(height329)"); // good 512, bad 896
      await testOne(500, 1.3, "(height500)"); // good 640, bad 280
      await testOne(640, 1.7, "(height640)"); // good 1024, bad 1536

    }

    waitUntilApzStable()
    .then(forceLayerTreeToCompositor)
    .then(test)
    .then(subtestDone, subtestFailed);
  </script>
</head>
<body>
  <a id="theplace" target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1689492">Mozilla Bug 1689492</a>
  
  <div style="height: 5000px"></div>
</body>
</html>

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