<!DOCTYPE html> <!-- webkit-test-runner [ internal:AsyncOverflowScrollingEnabled=true ] -->
<html>
<head>
    <style>
        body {
            height: 1000px;
        }
        .scroller {
            margin: 20px;
            height: 200px;
            width: 200px;
            border: 20px solid gray;
            padding: 5px;
            overflow: scroll;
        }
        .horizontal {
            overflow-y: hidden;
        }
        .vertical {
            overflow-x: hidden;
        }
        .content {
            width: 300%;
            height: 300%;
        }
        
    </style>
    <script src="../../../resources/js-test-pre.js"></script>
    <script src="../../../resources/ui-helper.js"></script>
    <script>
        var jsTestIsAsync = true;

        var horizontalScroller;
        var verticalScroller;
        var horizontalScrollerEventCount = 0;
        var verticalScrollerEventCount = 0;
        var windowScrollEventCount = 0;
        
        const horizontalScrollerMouseX = 100;
        const horizontalScrollerMouseY = 100;

        const verticalScrollerMouseX = 100;
        const verticalScrollerMouseY = 400;

        async function resetScrollPositions()
        {
            window.scrollTo(0, 0);
            horizontalScroller.scrollTop = 0;
            verticalScroller.scrollTop = 0;
            
            // Wait for scroll events to fire.
            await UIHelper.animationFrame();

            horizontalScrollerEventCount = 0;
            verticalScrollerEventCount = 0;
            windowScrollEventCount = 0;
        }

        async function testScrollInScroller(debugMessage, x, y, beginXDelta, beginYDelta, deltaX, deltaY, expectationsFunction)
        {
            debug('');
            debug(debugMessage);
            await resetScrollPositions();
            await UIHelper.mouseWheelScrollAt(x, y, beginXDelta, beginYDelta, deltaX, deltaY);
            expectationsFunction();
        }

        async function testHorizontalScrollInHorizontalScroller()
        {
            await testScrollInScroller('Test horizontal scroll in horizontal scroller', horizontalScrollerMouseX, horizontalScrollerMouseY, -1, 0, -10, 0, () => {
                shouldBe('horizontalScrollerEventCount > 0', 'true');
                shouldBe('verticalScrollerEventCount', '0');
                shouldBe('windowScrollEventCount', '0');
            });
        }

        async function testVerticalScrollInHorizontalScroller()
        {
            await testScrollInScroller('Test horizontal scroll in horizontal scroller', horizontalScrollerMouseX, horizontalScrollerMouseY, 0, -1, 0, -10, () => {
                shouldBe('horizontalScrollerEventCount', '0');
                shouldBe('verticalScrollerEventCount', '0');
                shouldBe('windowScrollEventCount > 0', 'true');
            });
        }

        async function testHorizontalScrollInVerticalScroller()
        {
            await testScrollInScroller('Test horizontal scroll in vertical scroller', verticalScrollerMouseX, verticalScrollerMouseY, -1, 0, -10, 0, () => {
                shouldBe('horizontalScrollerEventCount', '0');
                shouldBe('verticalScrollerEventCount', '0');
                shouldBe('windowScrollEventCount > 0', 'true'); // Rubberbanding
            });
        }

        async function testVerticalScrollInVerticalScroller()
        {
            await testScrollInScroller('Test vertical scroll in vertical scroller', verticalScrollerMouseX, verticalScrollerMouseY, 0, -1, 0, -10, () => {
                shouldBe('horizontalScrollerEventCount', '0');
                shouldBe('verticalScrollerEventCount > 0', 'true');
                shouldBe('windowScrollEventCount', '0');
            });
        }

        async function scrollTest()
        {
            await testHorizontalScrollInHorizontalScroller();
            await testVerticalScrollInHorizontalScroller();
            await testHorizontalScrollInVerticalScroller();
            await testVerticalScrollInVerticalScroller();

            finishJSTest();
        }

        window.addEventListener('load', () => {
            horizontalScroller = document.querySelector('.horizontal.scroller');
            horizontalScroller.addEventListener('scroll', () => {
                ++horizontalScrollerEventCount;
            }, false);

            verticalScroller = document.querySelector('.vertical.scroller');
            verticalScroller.addEventListener('scroll', () => {
                ++verticalScrollerEventCount;
            }, false);

            window.addEventListener('scroll', () => {
                ++windowScrollEventCount;
            }, false);

            setTimeout(scrollTest, 0);
        }, false);

        var successfullyParsed = true;
    </script>
</head>
<body>
    <div class="scroller horizontal">
        <div class="content"></div>
    </div>
    <div class="scroller vertical">
        <div class="content"></div>
    </div>
    <div id="console"></div>
    <script src="../../../resources/js-test-post.js"></script>
</body>
</html>