<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title> CSS Scroll Snap 2 Test: scrollsnapchange events</title>
<link rel="help" href="https://drafts.csswg.org/css-scroll-snap-2/#snap-events">
<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="/css/css-scroll-snap-2/resources/common.js"></script>
<script src="/css/css-scroll-snap-2/resources/user-scroll-common.js"></script>
<script src="/dom/events/scrolling/scroll_support.js"></script>
<script src="/web-animations/testcommon.js"></script>
</head>
<body>
<style>
body {
margin: 0px;
}
div {
position: absolute;
margin: 0px;
}
#spacer {
width: 200vw;
height: 200vh;
}
.scroller {
height: 400px;
width: 400px;
overflow: scroll;
scroll-snap-type: both mandatory;
}
.snap_point {
width: 40%;
height: 40%;
scroll-snap-align: start;
}
#snap_point_1 {
left: 0px;
top: 0px;
background-color: red;
}
#snap_point_2 {
top: 35%;
left: 35%;
background-color: orange;
}
#snap_point_3 {
top: 70%;
left: 70%;
background-color: blue;
}
</style>
<div id="scroller" class="scroller">
<div id="spacer"></div>
<div id="snap_point_1" class="snap_point"></div>
<div id="snap_point_2" class="snap_point"></div>
<div id="snap_point_3" class="snap_point"></div>
</div>
<script>
const scroller = document.getElementById("scroller");
const snap_point_1 = document.getElementById("snap_point_1");
const snap_point_2 = document.getElementById("snap_point_2");
const offset_to_snap_point_2 = {
x: snap_point_2.offsetLeft,
y: snap_point_2.offsetTop
};
// Touch scroll test.
promise_test(async (t) => {
await waitForCompositorCommit();
const start_pos = {
x: scroller.clientWidth / 2,
y: scroller.clientHeight / 2,
};
const end_pos = { x: 0, y: 0 };
const test_data = {
scroller: scroller,
scrolling_function: async () => {
await snap_event_touch_scroll_helper(start_pos, end_pos);
},
expected_snap_targets: { block: snap_point_2, inline: snap_point_2 },
expected_scroll_offsets: {
x: offset_to_snap_point_2.x,
y: offset_to_snap_point_2.y,
}
};
await test_scrollsnapchange(t, test_data);
}, "scrollsnapchange event fires after snap target changes on touch scroll");
// Wheel scroll test.
promise_test(async (t) => {
await waitForCompositorCommit();
const test_data = {
scroller: scroller,
scrolling_function: async () => {
await new test_driver.Actions().scroll(0, 0,
offset_to_snap_point_2.x,
offset_to_snap_point_2.y,
{ origin: scroller }).send();
},
expected_snap_targets: { block: snap_point_2, inline: snap_point_2 },
expected_scroll_offsets: {
x: offset_to_snap_point_2.x,
y: offset_to_snap_point_2.y,
}
};
await test_scrollsnapchange(t, test_data);
}, "scrollsnapchange event fires after snap target changes on wheel scroll");
// Scrollbar drag test.
promise_test(async (t) => {
await waitForCompositorCommit();
// Skip test on platforms that do not have a visible scrollbar (e.g.
// overlay scrollbar).
const scrollbar_width = scroller.offsetWidth - scroller.clientWidth;
if (scrollbar_width == 0)
return;
const test_data = {
scroller: scroller,
scrolling_function: async () => {
const scrollbar_to_scroller_ratio =
getScrollbarToScrollerRatio(scroller);
// Scroll by just over half of the top box's height.
const drag_amt = (offset_to_snap_point_2.y / 2 + 1) *
scrollbar_to_scroller_ratio;
await snap_event_scrollbar_drag_helper(scroller, scrollbar_width, drag_amt);
},
expected_snap_targets: { block: snap_point_2, inline: snap_point_1 },
expected_scroll_offsets: {
x: 0,
y: offset_to_snap_point_2.y,
}
};
await test_scrollsnapchange(t, test_data);
}, "scrollsnapchange event fires after snap target changes on scrollbar drag");
// Keyboard test.
promise_test(async (t) => {
await waitForCompositorCommit();
const test_data = {
scroller: scroller,
scrolling_function: async () => {
scroller.focus();
window.test_driver.send_keys(scroller, '\ue015'/*ArrowDown*/);
},
expected_snap_targets: { block: snap_point_2, inline: snap_point_1 },
expected_scroll_offsets: {
x: 0,
y: offset_to_snap_point_2.y,
}
};
await test_scrollsnapchange(t, test_data);
}, "scrollsnapchange event fires after snap target changes on keydown press");
// Touch scroll test (onscrollsnapchange variant).
promise_test(async (t) => {
await waitForCompositorCommit();
const start_pos = {
x: scroller.clientWidth / 2,
y: scroller.clientHeight / 2,
};
const end_pos = { x: 0, y: 0 };
const test_data = {
scroller: scroller,
scrolling_function: async () => {
await snap_event_touch_scroll_helper(start_pos, end_pos);
},
expected_snap_targets: { block: snap_point_2, inline: snap_point_2 },
expected_scroll_offsets: {
x: offset_to_snap_point_2.x,
y: offset_to_snap_point_2.y,
}
};
await test_scrollsnapchange(t, test_data, /*use_onsnap_memeber*/true);
}, "Element.onscrollsnapchange event fires after snap target changes on touch " +
"scroll");
promise_test(async (t) => {
await test_no_scrollsnapchange(t, scroller, /*delta*/10);
}, "scrollsnapchange is not fired if snap target doesn't change on user scroll");
</script>
</body>
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