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Bug 870205 - Fix intermittent browser_bug295977_autoscroll_overflow.js. r=neil

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This commit is contained in:
Drew Willcoxon 2014-06-05 10:50:33 -07:00
parent 3fccb7fce6
commit 1d611b64cf
1 changed files with 34 additions and 14 deletions
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48
toolkit/content/tests/browser/browser_bug295977_autoscroll_overflow.js
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@ -9,7 +9,7 @@ function test()
const expectScrollBoth = 3;
var allTests = [
{dataUri: 'data:text/html,<body><style type="text/css">div { display: inline-block; }</style>\
{dataUri: 'data:text/html,<html><head><meta charset="utf-8"></head><body><style type="text/css">div { display: inline-block; }</style>\
<div id="a" style="width: 100px; height: 100px; overflow: hidden;"><div style="width: 200px; height: 200px;"></div></div>\
<div id="b" style="width: 100px; height: 100px; overflow: auto;"><div style="width: 200px; height: 200px;"></div></div>\
<div id="c" style="width: 100px; height: 100px; overflow-x: auto; overflow-y: hidden;"><div style="width: 200px; height: 200px;"></div></div>\
@ -23,7 +23,7 @@ function test()
<div id="g" style="width: 99px; height: 99px; border: 10px solid black; margin: 10px; overflow: auto;"><div style="width: 100px; height: 100px;"></div></div>\
<div id="h" style="width: 100px; height: 100px; overflow: -moz-hidden-unscrollable;"><div style="width: 200px; height: 200px;"></div></div>\
<iframe id="iframe" style="display: none;"></iframe>\
</body>'},
</body></html>'},
{elem: 'a', expected: expectScrollNone},
{elem: 'b', expected: expectScrollBoth},
{elem: 'c', expected: expectScrollHori},
@ -32,11 +32,11 @@ function test()
{elem: 'f', expected: expectScrollNone},
{elem: 'g', expected: expectScrollBoth},
{elem: 'h', expected: expectScrollNone},
{dataUri: 'data:text/html,<html><body id="i" style="overflow-y: scroll"><div style="height: 2000px"></div>\
{dataUri: 'data:text/html,<html><head><meta charset="utf-8"></head><body id="i" style="overflow-y: scroll"><div style="height: 2000px"></div>\
<iframe id="iframe" style="display: none;"></iframe>\
</body></html>'},
{elem: 'i', expected: expectScrollVert}, // bug 695121
{dataUri: 'data:text/html,<html><style>html, body { width: 100%; height: 100%; overflow-x: hidden; overflow-y: scroll; }</style>\
{dataUri: 'data:text/html,<html><head><meta charset="utf-8"></head><style>html, body { width: 100%; height: 100%; overflow-x: hidden; overflow-y: scroll; }</style>\
<body id="j"><div style="height: 2000px"></div>\
<iframe id="iframe" style="display: none;"></iframe>\
</body></html>'},
@ -58,14 +58,35 @@ function test()
}
var elem = doc.getElementById(test.elem);
// Skip the first callback as it's the same callback that the browser
// uses to kick off the scrolling.
var skipFrames = 1;
var checkScroll = function () {
if (skipFrames--) {
let firstTimestamp = undefined;
function checkScroll(timestamp) {
if (firstTimestamp === undefined) {
firstTimestamp = timestamp;
}
// This value is calculated similarly to the value of the same name in
// ClickEventHandler.autoscrollLoop, except here it's cumulative across
// all frames after the first one instead of being based only on the
// current frame.
let timeCompensation = (timestamp - firstTimestamp) / 20;
info("timestamp=" + timestamp + " firstTimestamp=" + firstTimestamp +
" timeCompensation=" + timeCompensation);
// Try to wait until enough time has passed to allow the scroll to happen.
// autoscrollLoop incrementally scrolls during each animation frame, but
// due to how its calculations work, when a frame is very close to the
// previous frame, no scrolling may actually occur during that frame.
// After 20ms's worth of frames, timeCompensation will be 1, making it
// more likely that the accumulated scroll in autoscrollLoop will be >= 1,
// although it also depends on acceleration, which here in this test
// should be > 1 due to how it synthesizes mouse events below.
if (timeCompensation < 1) {
window.mozRequestAnimationFrame(checkScroll);
return;
}
// Close the autoscroll popup by synthesizing Esc.
EventUtils.synthesizeKey("VK_ESCAPE", {}, gBrowser.contentWindow);
var scrollVert = test.expected & expectScrollVert;
ok((scrollVert && elem.scrollTop > 0) ||
@ -83,6 +104,8 @@ function test()
EventUtils.synthesizeMouse(elem, 50, 50, { button: 1 },
gBrowser.contentWindow);
// This ensures bug 605127 is fixed: pagehide in an unrelated document
// should not cancel the autoscroll.
var iframe = gBrowser.contentDocument.getElementById("iframe");
var e = iframe.contentDocument.createEvent("pagetransition");
e.initPageTransitionEvent("pagehide", true, true, false);
@ -92,11 +115,8 @@ function test()
EventUtils.synthesizeMouse(elem, 100, 100,
{ type: "mousemove", clickCount: "0" },
gBrowser.contentWindow);
/*
* if scrolling didn’t work, we wouldn’t do any redraws and thus time out.
* so request and force redraws to get the chance to check for scrolling at
* all.
*/
// Start checking for the scroll.
window.mozRequestAnimationFrame(checkScroll);
}