<!DOCTYPE html>
<html>
<head>
<style>
.scrollable_region {
    width: 680px;
}

.table td, .table th {
    padding: 2px;
}

.table th {
    height: 20px;
    text-align: left;
    font-weight: strong;
}

.table tr:nth-child(odd) {
    background: #f3f3f3;
}

.scrollable_select option:nth-child(odd) {
    background: #f3f3f3;
}

</style>
<script src="../../resources/js-test-pre.js"></script>
<script src="../../resources/ui-helper.js"></script>
<script>
function onLoad() {
    setupTopLevel();
}
</script>
</head>
<body onload="onLoad();">
<script>

var selectTarget;
var pageScrollPositionBefore;
var selectScrollPositionBefore;
var continueCount = 5;

function checkForScroll()
{
    // The page should not have scrolled at all.
    var pageScrollPositionAfter = document.scrollingElement.scrollTop;
    var selectScrollPositionAfter = selectTarget.scrollTop;

    if (pageScrollPositionBefore != pageScrollPositionAfter)
        testFailed("Page received wheel events.");
    else
        testPassed("Page did not receive wheel events.");

    if (window.internals) {
        document.getElementById('layers').innerText = internals.layerTreeAsText(document,
            internals.LAYER_TREE_INCLUDES_VISIBLE_RECTS | internals.LAYER_TREE_INCLUDES_TILE_CACHES);
    }

    testRunner.notifyDone();
}

async function scrollTest()
{
    pageScrollPositionBefore = document.scrollingElement.scrollTop;

    selectTarget = document.getElementById('target');
    selectTarget.scrollTop = selectTarget.scrollHeight - selectTarget.clientHeight - 100;

    selectScrollPositionBefore = selectTarget.scrollTop;

    // Scroll the #source until we reach the #target.
    const startPosX = Math.round(selectTarget.offsetLeft) + 20;
    const startPosY = Math.round(selectTarget.offsetTop) + Math.round(selectTarget.clientHeight) - 42;

    debug("div display height = " + Math.round(selectTarget.clientHeight));
    debug("Mouse moved to (" + startPosX + ", " + startPosY + ")");

    const events = [
        {
            type : "wheel",
            viewX : startPosX,
            viewY : startPosY,
            deltaY : -10,
            phase : "began"
        },
        {
            type : "wheel",
            deltaY : -10,
            phase : "changed"
        },
        {
            type : "wheel",
            deltaY : -10,
            phase : "changed"
        },
        {
            type : "wheel",
            phase : "ended"
        },
        {
            type : "wheel",
            deltaY : -10,
            momentumPhase : "began"
        },
        {
            type : "wheel",
            deltaY : -10,
            momentumPhase : "changed"
        },
        {
            type : "wheel",
            momentumPhase : "ended"
        }
    ];

    await UIHelper.mouseWheelSequence({ events: events });
    checkForScroll();
}

function setupTopLevel()
{
    if (window.eventSender) {
        testRunner.dumpAsText();
        testRunner.waitUntilDone();
        setTimeout(scrollTest, 0);
    } else {
        var messageLocation = document.getElementById('parent');
        var message = document.createElement('div');
        message.innerHTML = "<p>This test is better run under DumpRenderTree. To manually test it, place the mouse pointer<br/>"
            + "inside the select box, and scroll near (but not AT) the bottom of the range. Use the mouse wheel or a two-finger<br/>"
            + "swipe to scroll through the rest of the select options.<br/><br/>"
            + "You should not see the page position change if this test is successful.</p>";
        messageLocation.appendChild(message);
    }
}

</script>
<div id="parent" style="height: 2000px; width: 2000px;">
    <div id="source" style="height: 100px; width: 500px;">
        Put mouse near the bottom of the select and scroll downwards.
    </div>
        <div class="scrollable_region">
            <h3>Scrollable Select</h3>
            <select id="target" class="scrollable_select" size="8">
                <option>content1</option>
                <option>content2</option>
                <option>content3</option>
                <option>content4</option>
                <option>content5</option>
                <option>content6</option>
                <option>content7</option>
                <option>content8</option>
                <option>content9</option>
                <option>content10</option>
                <option>content11</option>
                <option>content12</option>
                <option>content13</option>
                <option>content14</option>
                <option>content15</option>
                <option>content16</option>
                <option>content17</option>
                <option>content18</option>
                <option>content19</option>
                <option>content20</option>
                <option>content21</option>
            </select>
        </div>
    </div>
</div>
<div id="console"></div>
<script>
description("Tests that a select doesn't pass wheel events to main frame when scrolling at bottom");
</script>
<pre id="layers">Layer tree goes here</p>
<script src="../../resources/js-test-post.js"></script>
</body>
</html>