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<!DOCTYPE HTML>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=device-width, initial-scale=1">
<title>Test that scroll snap happens on pan end without fling</title>
<script src="apz_test_utils.js"></script>
<script src="apz_test_native_event_utils.js"></script>
<script src="/tests/SimpleTest/paint_listener.js"></script>
<style>
body {
margin: 0;
padding: 0;
}
html {
overflow-y: scroll;
scroll-snap-type: y mandatory;
scroll-behavior: auto;
}
.snap {
width: 100%;
height: 100vh;
background-color: blue;
position: absolute;
top: 200px;
scroll-snap-align: start;
}
</style>
</head>
<body>
<div class="snap"></div>
<div style="width: 100%; height: 500vh;"></div>
<script type="application/javascript">
async function test() {
is(window.scrollY, 200, "The initial layout should result snapping to 200px");
// Start scrolling back by a pan gesture and wait its' scroll end.
let transformEndPromise = promiseTransformEnd();
await promiseNativeTouchpadPanEventAndWaitForObserver(
window,
100,
100,
0, -100,
SpecialPowers.DOMWindowUtils.PHASE_BEGIN);
// Finish the pan gesture.
await promiseNativeTouchpadPanEventAndWaitForObserver(
window,
100,
100,
0, 0,
SpecialPowers.DOMWindowUtils.PHASE_END);
await transformEndPromise;
// Make sure the new scroll positions have reached to the main-thread.
await promiseOnlyApzControllerFlushed();
is(window.scrollY, 200, "The pan-end should result snapping to 200px");
}
// This test is supposed to run on environments where
// PanGestureInput.mSimulateMomentum for pan gestures is true, which means
// as of now it's only on Linux.
if (getPlatform() == "linux") {
waitUntilApzStable()
.then(test)
.then(subtestDone, subtestFailed);
} else {
ok(true, "Skipping test because this test isn't supposed to work on " + getPlatform());
subtestDone();
}
</script>
</body>
</html>