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<!DOCTYPE html>
<html>
<head>
<meta charset="utf-8">
<title> CSS Scroll Snap 2 Test: snapchanged 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="/css/css-scroll-snap-2/resources/common.js"></script>
<script src="/dom/events/scrolling/scroll_support.js"></script>
<script src="/web-animations/testcommon.js"></script>
</head>
<body onload="runTests()">
<style>
body {
margin: 0px;
}
div {
position: absolute;
margin: 0px;
}
#spacer {
width: 2000px;
height: 2000px;
}
.scroller {
height: 400px;
width: 400px;
overflow: scroll;
scroll-snap-type: both mandatory;
}
.snap_point {
width: 300px;
height: 300px;
scroll-snap-align: start;
}
#snap_point_1 {
left: 0px;
top: 0px;
background-color: red;
}
#snap_point_2 {
top: 300px;
left: 300px;
background-color: orange;
}
#snap_point_3 {
left: 600px;
top: 600px;
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>
function runTests () {
let scroller = document.getElementById("scroller");
promise_test(async (t) => {
await waitForCompositorCommit();
const test_data = {
scroller: scroller,
scrolling_function: () => {
scroller.scrollTo(snap_point_2.offsetLeft, snap_point_2.offsetTop);
},
expected_snap_targets: { block: snap_point_2, inline: snap_point_2 },
expected_scroll_offsets: {
x: snap_point_2.offsetLeft,
y: snap_point_2.offsetTop,
}
};
await test_snapchanged(t, test_data);
}, "snapchanged event fires after snap target changes via scrollTo");
promise_test(async (t) => {
checkSnapEventSupport("snapchanged");
await waitForScrollReset(t, scroller);
await waitForCompositorCommit();
assert_equals(scroller.scrollTop, 0,
"scroller is initially not scrolled vertically");
assert_equals(scroller.scrollLeft, 0,
"scroller is initially not scrolled horizontally");
let snapchanged_promise = waitForSnapChangedEvent(scroller, false);
// Set the scroll destination to just a little off (0, 0) so we snap
// back to the top box.
let scroll_top_target = 10;
let scroll_left_target = 10;
scroller.scrollTo(scroll_left_target, scroll_top_target);
let evt = await snapchanged_promise;
assert_equals(evt, null, "no snapchanges since scroller is back to top");
// scroller should snap back to (0,0) with no snapchanged event.
assert_equals(scroller.scrollTop, 0, "scroller snaps back to the top");
assert_equals(scroller.scrollLeft, 0, "scroller snaps back to the left");
snapchanged_promise = waitForSnapChangedEvent(scroller);
scroll_top_target = snap_point_2.offsetTop + 10;
scroll_left_target = snap_point_2.offsetLeft + 10;
// This scroll should snap to snap_point_2, so snapchanged should be
// fired.
scroller.scrollTo(scroll_left_target, scroll_top_target);
evt = await snapchanged_promise;
assertSnapEvent(evt, { block: snap_point_2, inline: snap_point_2 })
assert_approx_equals(scroller.scrollTop, snap_point_2.offsetTop, 1,
"scroller snaps to the top of snap_point_2");
assert_approx_equals(scroller.scrollLeft, snap_point_2.offsetLeft, 1,
"scroller snaps to the left of snap_point_2");
}, "snapchanged is not fired if snap target doesn't change on " +
"programmatic scroll");
}
</script>
</body>
</html>
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