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<!DOCTYPE HTML>
<html>
<head>
<meta charset="utf-8">
<meta name="viewport" content="width=2100"/>
<title>Check that double tapping on a scrollbar does not scroll to top</title>
<script type="application/javascript" src="apz_test_native_event_utils.js"></script>
<script type="application/javascript" src="apz_test_utils.js"></script>
<script src="/tests/SimpleTest/paint_listener.js"></script>
<script type="application/javascript">
async function test() {
let useTouchpad = (location.search == "?touchpad");
var resolution = await getResolution();
var start_resolution = resolution;
ok(resolution > 0,
"The initial_resolution is " + resolution + ", which is some sane value");
// Check that double-tapping once zooms in
await doubleTapOn(document.getElementById("target"), 10, 10, useTouchpad);
var prev_resolution = resolution;
resolution = await getResolution();
ok(resolution > prev_resolution, "The first double-tap has increased the resolution to " + resolution);
// instant scroll to the middle of the page
window.scrollTo({
top: 4 * window.innerHeight,
left: 0,
behavior: 'auto'
});
await promiseApzFlushedRepaints();
let prevScrollX = window.scrollX;
let prevScrollY = window.scrollY;
ok(3.9 * window.innerHeight < window.scrollY && window.scrollY < 4.1 * window.innerHeight,
"scrollY looks good");
// Check that double-tapping on the bottom scrollbar does not scroll us to the top
// Need to divide by resolution because the coords are assumed to be inside the resolution
await doubleTapOn(window, (window.innerWidth/2)/resolution, (window.innerHeight - 5)/resolution, useTouchpad);
prev_resolution = resolution;
resolution = await getResolution();
ok(resolution < prev_resolution, "The second double-tap has decreased the resolution to " + resolution);
ok(resolution == start_resolution, "The second double-tap has decreased the resolution to the start to " + resolution);
info("prevscroll " + prevScrollX + " " + prevScrollY + "\n");
info("window.scroll " + window.scrollX + " " + window.scrollY + "\n");
ok(0.88*prevScrollY < window.scrollY && window.scrollY < prevScrollY*1.12, "scroll y didn't change by much");
}
waitUntilApzStable()
.then(test)
.then(subtestDone, subtestFailed);
</script>
<style type="text/css">
.spacer {
background-color: #eee;
width: 10px;
height: 800vh;
}
</style>
</head>
<body>
<div id="target" style="width: 100px; height: 100px; background: red;">
</div>
<div class="spacer">
</div>
</body>
</html>
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