wheel-event-transactions-basic.html

<!DOCTYPE HTML>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width,initial-scale=1,minimum-scale=1">
<meta name="variant" content="?include=target-basic"/>
<meta name="variant" content="?include=scroll-over-scrollable-child"/>
<meta name="variant" content="?include=transaction-not-bound-to-scroll-frame"/>
<script src="/resources/testharness.js"></script>
<script src="/resources/testharnessreport.js"></script>
<script src="/resources/testdriver.js"></script>
<script src="/resources/testdriver-actions.js"></script>
<script src="/resources/testdriver-vendor.js"></script>
<script src="/common/subset-tests-by-key.js"></script>
<script src="scroll_support.js"></script>
<style>
body {
  margin: 0;
  padding: 0;
  height: 200vh;
}

.spacer {
  width: 100%;
  height: 25px;
  padding: 0;
  margin: 0;
}

#scrollableDiv {
  width: 100%;
  height: 500px;
  overflow: scroll;
  background: yellow;
}

#innerDiv {
  width: 100%;
  height: 4000px;
  background: red;
}

</style>
<head>
<body onload=runTest()>
<div id="firstRootSpacer" class="spacer" style="background: cyan"></div>
<div id="secondRootSpacer" class="spacer" style="background: magenta"></div>
<div id="scrollableDiv">
  <div id="innerDiv">
    <div id="firstInnerSpacer" class="spacer" style="background: green">
    </div>
    <div id="secondInnerSpacer" class="spacer" style="background: blue">
    </div>
  </div>
</div>
</body>

<script>

let variants = [
  // Ensure that the wheel transaction fires all wheel events to the initial
  // target.
  {
    key: 'target-basic',
    origin: "viewport",
    scrollX: 40,
    scrollY: 2,
    scrollingElement: document.scrollingElement,
    targetElement: firstRootSpacer,
    title: 'Wheel events should be captured to one target #1',
  },
  // Ensure that the wheel transaction fires all wheel events to the initial
  // target, even when another scroll frame is under the mouse cursor.
  {
    key: 'scroll-over-scrollable-child',
    origin: "viewport",
    scrollX: 40,
    scrollY: 27,
    scrollingElement: document.scrollingElement,
    targetElement: secondRootSpacer,
    title: 'Wheel events should be captured to one target #2',
  },
  // Ensure that the wheel transaction targets the topmost-element, which is
  // not the scrollable element.
  {
    key: 'transaction-not-bound-to-scroll-frame',
    origin: innerDiv,
    scrollX: 40,
    scrollY: 2,
    scrollingElement: scrollableDiv,
    targetElement: innerDiv,
    title: 'The wheel event transactions target may not be a scroll frame',
  },
];

function runTest() {
  async function testBasic(testInfo, t) {
    await waitForCompositorReady();

    await waitForCompositorCommit();

    let wheelEventTargets = [];
    function pushTargetToWheelEventTargets(e) {
      wheelEventTargets.push(e.target)
    }

    window.addEventListener("wheel", pushTargetToWheelEventTargets, {passive: true});

    // Scroll past the boundary of the original element to ensure all events in
    // transaction have the same target.
    await new test_driver.Actions()
      .addWheel("wheel1")
      .scroll(testInfo.scrollX, testInfo.scrollY, 0, 30, {origin: testInfo.origin})
      .pause(1)
      .scroll(testInfo.scrollX, testInfo.scrollY, 0, 30, {origin: testInfo.origin})
      .pause(1)
      .scroll(testInfo.scrollX, testInfo.scrollY, 0, 30, {origin: testInfo.origin})
      .send();

    // TODO(dlrobertson): Use the scrollend event here to wait for the
    // wheel scroll to finish instead of waitForAnimationEnd().
    await waitForAnimationEnd(() => { return testInfo.scrollingElement.scrollTop; });
    await waitForCompositorCommit();

    // Ensure that all the captured wheel events are the expected target.
    wheelEventTargets.forEach((wheelEventTarget, i) => {
      assert_equals(wheelEventTarget, testInfo.targetElement,
                    "Wheel event at index `" + i + "` does not have the expected target");
    });

    assert_greater_than(testInfo.scrollingElement.scrollTop, 0,
                        "The scrolling element has scrolled");
  }

  variants.forEach((testInfo) => {
    subsetTestByKey(testInfo.key, promise_test, t => testBasic(testInfo, t), testInfo.title);
  });
}
</script>
</html>
chromium/third_party/blink/web_tests/external/wpt/dom/events/scrolling/wheel-event-transactions-basic.html
