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<!DOCTYPE HTML>
<html>
<head>
<title>Test for Bug 1120705</title>
<script src="/tests/SimpleTest/SimpleTest.js"></script>
<script 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>
<p id="display"></p>
<select id="sel">
<option value="1">1</option>
<option value="2">2</option>
<option value="3">3</option>
<option value="4">4</option>
<option value="5">5</option>
<option value="6">6</option>
<option value="7">7</option>
<option value="8">8</option>
<option value="9">9</option>
<option value="10">10</option>
<option value="11">11</option>
<option value="12">12</option>
<option value="13">13</option>
<option value="14">14</option>
<option value="15">15</option>
<option value="16">16</option>
<option value="17">17</option>
<option value="18">18</option>
<option value="19">19</option>
<option value="20">20</option>
</select>
<pre id="test">
<script class="testbody" type="text/javascript">
function clickDownButton() {
var sel = document.getElementById("sel");
var scrollbar_width = sel.offsetWidth - sel.clientWidth;
synthesizeMouse(sel,
sel.offsetWidth - scrollbar_width / 2,
sel.offsetHeight - scrollbar_width / 2,
{ type: "mousedown" });
synthesizeMouse(sel,
sel.offsetWidth - scrollbar_width / 2,
sel.offsetHeight - scrollbar_width / 2,
{ type: "mouseup" });
}
function waitForScrollEvent(aWindow) {
return new Promise(resolve => {
aWindow.addEventListener("scroll", () => { SimpleTest.executeSoon(resolve); }, {once: true, capture: true});
});
}
SimpleTest.waitForExplicitFinish();
addLoadEvent(function() {
SpecialPowers.pushPrefEnv({
"set": [["general.smoothScroll", false],
["toolkit.scrollbox.verticalScrollDistance", 3]]},
async function() {
var sel = document.getElementById("sel");
sel.size = 2;
sel.scrollTo(0, 0);
await waitToClearOutAnyPotentialScrolls(window);
is(sel.scrollTop, 0, "sanity check that we start scrolling from 0");
let waitForScrolling = waitForScrollEvent(window);
clickDownButton();
await waitForScrolling;
var restricted_top = sel.scrollTop;
isnot(restricted_top, 0,
"Expected to scroll when clicking scrollbar button");
sel.size = 10;
sel.scrollTo(0, 0);
await waitToClearOutAnyPotentialScrolls(window);
is(sel.scrollTop, 0, "sanity check that we start scrolling from 0");
waitForScrolling = waitForScrollEvent(window);
clickDownButton();
await waitForScrolling;
isnot(sel.scrollTop, 0,
"Expected to scroll when clicking scrollbar button");
isnot(sel.scrollTop, restricted_top,
"Scrollbar button scrolling should be limited by page size");
SimpleTest.finish();
});
});
</script>
</pre>
</body>
</html>
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