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<!DOCTYPE HTML>
<html>
<!--
https://bugzilla.mozilla.org/show_bug.cgi?id=607464
-->
<head>
<title>Test for Bug 607464</title>
<script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
<script type="text/javascript" src="/tests/SimpleTest/EventUtils.js"></script>
<script type="text/javascript" src="/tests/gfx/layers/apz/test/mochitest/apz_test_utils.js"></script>
<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
</head>
<body>
<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=607464">Mozilla Bug 607464</a>
<p id="display"></p>
<div id="content" style="display: none">
</div>
<pre id="test">
<script type="application/javascript;version=1.7">
/**
* Test for Bug 607464:
* Pixel scrolling shouldn't scroll smoothly, even if general.smoothScroll is on.
**/
function scrollDown150PxWithPixelScrolling(scrollbox) {
var win = scrollbox.ownerDocument.defaultView;
let event = {
deltaMode: WheelEvent.DOM_DELTA_PIXEL,
deltaY: 30.0,
lineOrPageDeltaY: 1
};
// A pixel scroll with lineOrPageDeltaY.
synthesizeWheel(scrollbox, 10, 10, event, win);
// then 4 pixel scrolls without lineOrPageDeltaY.
event.lineOrPageDeltaY = 0;
for (let i = 0; i < 4; ++i) {
synthesizeWheel(scrollbox, 10, 10, event, win);
}
// Note: the line scroll shouldn't have any effect because it has
// hasPixels = true set on it. We send it to emulate normal
// behavior.
}
function runTest() {
var win = open('data:text/html,<!DOCTYPE html>\n' +
'<div id="scrollbox" style="height: 100px; overflow: auto;">' +
' <div style="height: 1000px;"></div>' +
'</div>', '_blank', 'width=300,height=300');
SimpleTest.waitForFocus(function () {
var scrollbox = win.document.getElementById("scrollbox");
let scrollTopBefore = scrollbox.scrollTop;
win.addEventListener("scroll", function(e) {
is(scrollbox.scrollTop % 30, 0,
"Pixel scrolling should happen instantly, not smoothly. The " +
"scroll position " + scrollbox.scrollTop + " in this sequence of wheel " +
"events should be a multiple of 30.");
if (scrollbox.scrollTop == 150) {
win.close();
SimpleTest.finish();
}
}, true);
flushApzRepaints(function() {
scrollDown150PxWithPixelScrolling(scrollbox);
}, win);
}, win);
}
window.onload = function() {
SpecialPowers.pushPrefEnv({
"set":[["general.smoothScroll", true],
["mousewheel.acceleration.start", -1],
["mousewheel.system_scroll_override_on_root_content.enabled", false]]}, runTest);
}
SimpleTest.waitForExplicitFinish();
SimpleTest.testInChaosMode();
</script>
</pre>
</body>
</html>
|
