tor-browser

The Tor Browser
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helper_scrollbarbuttonclick_checkerboard.html (2329B)

      1 <!DOCTYPE HTML>
      2 <html>
      3 <head>
      4  <meta charset="utf-8">
      5  <meta name="viewport" content="width=device-width; initial-scale=1.0">
      6  <title>Test that repeated scrollbar button clicks do not cause checkerboarding</title>
      7  <script type="application/javascript" src="apz_test_native_event_utils.js"></script>
      8  <script type="application/javascript" src="apz_test_utils.js"></script>
      9  <script src="/tests/SimpleTest/paint_listener.js"></script>
     10  <script type="text/javascript">
     11 
     12 async function test() {
     13  let utils = SpecialPowers.getDOMWindowUtils(window);
     14  let scrollId = utils.getViewId(document.documentElement);
     15  let w = {}, h = {};
     16  utils.getScrollbarSizes(document.documentElement, w, h);
     17  let verticalScrollbarWidth = w.value;
     18  if (verticalScrollbarWidth == 0) {
     19    ok(true, "No scrollbar, can't do this test");
     20  }
     21  let downArrowHeight = verticalScrollbarWidth; // assume square scrollbar buttons
     22  var mouseX = document.documentElement.clientWidth + verticalScrollbarWidth / 2;
     23  let mouseY = document.documentElement.clientHeight - (downArrowHeight / 2);
     24 
     25  // Hold the mouse down on the scrollbar button and
     26  // keep it down to trigger the "button repeat" codepath.
     27  await promiseNativeMouseEventWithAPZ({
     28    type: "mousedown",
     29    target: window,
     30    offsetX: mouseX,
     31    offsetY: mouseY,
     32  });
     33 
     34  const repetitions = 20;
     35  const repeat_delay = 50;  // milliseconds
     36  for (i = 0; i < repetitions; i++) {
     37    // Wait for the results of the click (or, on subsequent iterations
     38    // the repeat) to be painted.
     39    await promiseFrame();
     40 
     41    assertNotCheckerboarded(utils, scrollId, "after scrollbar button click-hold", true);
     42 
     43    // Wait enough time to trigger the repeat timer.
     44    await SpecialPowers.promiseTimeout(repeat_delay);
     45  }
     46 
     47  // Release mouse button to clean up.
     48  await promiseNativeMouseEventWithAPZ({
     49    type: "mouseup",
     50    target: window,
     51    offsetX: mouseX,
     52    offsetY: mouseY,
     53  });
     54 
     55  // Sanity-check: we should have scrolled.
     56  ok(window.scrollY > 0, "Should have scrolled by clicking the scrollbar button");
     57 }
     58 
     59 waitUntilApzStable()
     60 .then(test)
     61 .then(subtestDone, subtestFailed);
     62 
     63  </script>
     64  <style>
     65    .page-footer {
     66      background-color: #212121;
     67      color: #fff;
     68      height: 3000px;
     69    }
     70  </style>
     71 </head>
     72 <body>
     73  <footer class="page-footer"></footer>
     74 </body>
     75 </html>