helper_hittest_basic.html

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<!DOCTYPE HTML>

<html>

<head>

  <title>Various tests to exercise the APZ hit-testing codepaths</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>

  <meta name="viewport" content="width=device-width"/>

</head>

<body>

 <div id="scroller" style="width: 300px; height: 300px; overflow:scroll; margin-top: 100px; margin-left: 50px">

  <div id="contents" style="width: 500px; height: 500px; background-image: linear-gradient(blue,red)">

   <div id="apzaware" style="position: relative; width: 100px; height: 100px; top: 300px; background-color: red" onwheel="return false;"></div>

  </div>

 </div>

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

</body>

<script type="application/javascript">

async function test() {

  var config = getHitTestConfig();

  var utils = config.utils;

  var scroller = document.getElementById("scroller");

  var apzaware = document.getElementById("apzaware");

  let expectedHitInfo = APZHitResultFlags.VISIBLE;

  if (!config.activateAllScrollFrames) {

    expectedHitInfo |= APZHitResultFlags.INACTIVE_SCROLLFRAME;

  checkHitResult(hitTest(centerOf(scroller)),

                 expectedHitInfo,

                 (config.activateAllScrollFrames ? utils.getViewId(scroller)

                                                 : utils.getViewId(document.scrollingElement)),

                 utils.getLayersId(),

                 "inactive scrollframe");

  // The apz-aware div (which has a non-passive wheel listener) is not visible

  // and so the hit-test should just return the root scrollframe area that's

  // covering it

  checkHitResult(hitTest(centerOf(apzaware)),

                 APZHitResultFlags.VISIBLE,

                 utils.getViewId(document.scrollingElement),

                 utils.getLayersId(),

                 "inactive scrollframe - apzaware block");

  // Hit test where the scroll thumbs should be.

  hitTestScrollbar({

    element: scroller,

    directions: { vertical: true, horizontal: true },

    expectedScrollId: utils.getViewId(document.scrollingElement),

    expectedLayersId: utils.getLayersId(),

    trackLocation: ScrollbarTrackLocation.START,

    expectThumb: true,

    layerState: LayerState.INACTIVE,

});

  // activate the scrollframe but keep the main-thread scroll position at 0.

  // also apply a async scroll offset in the y-direction such that the

  // scrollframe scrolls to the bottom of its range.

  utils.setDisplayPortForElement(0, 0, 500, 500, scroller, 1);

  await promiseApzFlushedRepaints();

  var scrollY = scroller.scrollTopMax;

  utils.setAsyncScrollOffset(scroller, 0, scrollY);

  // Tick the refresh driver once to make sure the compositor has applied the

  // async scroll offset (for WebRender hit-testing we need to make sure WR has

  // the latest info).

  utils.advanceTimeAndRefresh(16);

  utils.restoreNormalRefresh();

  var scrollerViewId = utils.getViewId(scroller);

  // Now we again test the middle of the scrollframe, which is now active

  checkHitResult(hitTest(centerOf(scroller)),

                 APZHitResultFlags.VISIBLE,

                 scrollerViewId,

                 utils.getLayersId(),

                 "active scrollframe");

  // Test the apz-aware block

  var apzawarePosition = centerOf(apzaware); // main thread position

  apzawarePosition.y -= scrollY; // APZ position

  checkHitResult(hitTest(apzawarePosition),

                 APZHitResultFlags.VISIBLE |

                 APZHitResultFlags.APZ_AWARE_LISTENERS,

                 scrollerViewId,

                 utils.getLayersId(),

                 "active scrollframe - apzaware block");

  // Test the scrollbars. Note that this time the vertical scrollthumb is

  // going to be at the bottom of the track. We'll test both the top and the

  // bottom.

  // top of scrollbar track

  hitTestScrollbar({

    element: scroller,

    directions: { vertical: true },

    expectedScrollId: scrollerViewId,

    expectedLayersId: utils.getLayersId(),

    trackLocation: ScrollbarTrackLocation.START,

    expectThumb: false,

    layerState: LayerState.ACTIVE,

});

  // bottom of scrollbar track (scrollthumb)

  hitTestScrollbar({

    element: scroller,

    directions: { vertical: true },

    expectedScrollId: scrollerViewId,

    expectedLayersId: utils.getLayersId(),

    trackLocation: ScrollbarTrackLocation.END,

    expectThumb: true,

    layerState: LayerState.ACTIVE,

});

  // left part of scrollbar track (has scrollthumb)

  hitTestScrollbar({

    element: scroller,

    directions: { horizontal: true },

    expectedScrollId: scrollerViewId,

    expectedLayersId: utils.getLayersId(),

    trackLocation: ScrollbarTrackLocation.START,

    expectThumb: true,

    layerState: LayerState.ACTIVE,

});

  // right part of scrollbar track

  hitTestScrollbar({

    element: scroller,

    directions: { horizontal: true },

    expectedScrollId: scrollerViewId,

    expectedLayersId: utils.getLayersId(),

    trackLocation: ScrollbarTrackLocation.END,

    expectThumb: false,

    layerState: LayerState.ACTIVE,

});

waitUntilApzStable()

.then(test)

.then(subtestDone, subtestFailed);

</script>

</html>