tor-browser

The Tor Browser
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helper_scrollbartrack_click_overshoot.html (2897B)

      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>Scrolling with mouse down on the scrollbar</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  <style>
     11    .content {
     12      width: 1000px;
     13      height: 20000px;
     14    }
     15  </style>
     16  <script type="text/javascript">
     17 
     18 async function test() {
     19  var targetElement = elementForTarget(window);
     20  var w = {},
     21    h = {};
     22  var utils = utilsForTarget(window);
     23  utils.getScrollbarSizes(targetElement, w, h);
     24  var verticalScrollbarWidth = w.value;
     25  var mouseX = targetElement.clientWidth + verticalScrollbarWidth / 2;
     26  var mouseY = targetElement.clientHeight - 100; // 100 pixels above the bottom of the scrollbar track
     27 
     28  let scrollEndPromise = promiseScrollend();
     29 
     30  // Click and hold the mouse. Thumb should start scrolling towards the click location.
     31  await promiseNativeMouseEventWithAPZ({
     32    target: window,
     33    offsetX: mouseX,
     34    offsetY: mouseY,
     35    type: "mousemove",
     36  });
     37  // mouse down
     38  await promiseNativeMouseEventWithAPZ({
     39    target: window,
     40    offsetX: mouseX,
     41    offsetY: mouseY,
     42    type: "mousedown",
     43  });
     44 
     45  // Wait for scrolling to complete
     46  await scrollEndPromise;
     47 
     48  // Work around bug 1825879: we may get an extra scrollend
     49  // event too early.
     50  if (window.scrollY < (window.scrollMaxY / 2)) {
     51    scrollEndPromise = promiseScrollend();
     52    await scrollEndPromise;
     53  }
     54 
     55  // Flush everything just to be safe
     56  await promiseOnlyApzControllerFlushed();
     57 
     58  // Give WebRender a chance to sample any remaining async scroll offset
     59  // that affects the scrollbar position.
     60  utils.advanceTimeAndRefresh(16);
     61  utils.restoreNormalRefresh();
     62 
     63  var result = hitTest({x: mouseX, y: mouseY});
     64 
     65  // Check that the scroll thumb is under the cursor.
     66  // If the bug occurs, the thumb will scroll too far and
     67  // will not be under the cursor.
     68  ok((result.hitInfo & APZHitResultFlags.SCROLLBAR_THUMB) != 0, "Scrollbar thumb hit");
     69 
     70  await promiseNativeMouseEventWithAPZ({
     71    target: window,
     72    offsetX: mouseX,
     73    offsetY: mouseY,
     74    type: "mouseup",
     75  });
     76 }
     77 
     78 if (getPlatform() == "mac") {
     79  ok(true, "Skipping test on Mac (bug 1851423)");
     80  subtestDone();
     81 } else {
     82  // Note: on Linux, if the gtk-primary-button-warps-slider setting
     83  // is enabled, this test will not exercise the codepath it intends
     84  // to test (the thumb will jump immediately under the cursor, causing
     85  // the test to pass trivially). However, the test should still not fail.
     86  waitUntilApzStable()
     87  .then(test)
     88  .then(subtestDone, subtestFailed);
     89 }
     90 
     91  </script>
     92 </head>
     93 <body>
     94  <div class="content">Some content to ensure the root scrollframe is scrollable</div>
     95 </body>
     96 </html>