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Bug 1247074 - When a compositor-based smooth scroll animation is in progress and the scrollframe is reconstructed, restore to the animation destination. r=tnikkel

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MozReview-Commit-ID: 73juHWNfoQy

--HG--
extra : rebase_source : 2820533eeb48870956cd6e545bd7705c898a6cad
This commit is contained in:
Kartikaya Gupta 2016-08-29 20:28:40 -04:00
parent af467a2ef4
commit 3a210fcece
3 changed files with 140 additions and 3 deletions
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14
layout/generic/nsGfxScrollFrame.cpp
View File

@ -5892,8 +5892,9 @@ ScrollFrameHelper::SaveState() const
}
// Don't store a scroll state if we never have been scrolled or restored
// a previous scroll state.
if (!mHasBeenScrolled && !mDidHistoryRestore) {
// a previous scroll state, and we're not in the middle of a smooth scroll.
bool isInSmoothScroll = IsProcessingAsyncScroll() || mLastSmoothScrollOrigin;
if (!mHasBeenScrolled && !mDidHistoryRestore && !isInSmoothScroll) {
return nullptr;
}
@ -5902,8 +5903,15 @@ ScrollFrameHelper::SaveState() const
// valid and we haven't moved since the last update of mLastPos (same check
// that ScrollToRestoredPosition uses). This ensures if a reframe occurs
// while we're in the process of loading content to scroll to a restored
// position, we'll keep trying after the reframe.
// position, we'll keep trying after the reframe. Similarly, if we're in the
// middle of a smooth scroll, store the destination so that when we restore
// we'll jump straight to the end of the scroll animation, rather than
// effectively dropping it. Note that the mRestorePos will override the
// smooth scroll destination if both are present.
nsPoint pt = GetLogicalScrollPosition();
if (isInSmoothScroll) {
pt = mDestination;
}
if (mRestorePos.y != -1 && pt == mLastPos) {
pt = mRestorePos;
}

1
layout/generic/test/mochitest.ini
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@ -146,3 +146,4 @@ skip-if = buildapp == 'mulet'
support-files = file_taintedfilters_feDisplacementMap-tainted-1.svg file_taintedfilters_feDisplacementMap-tainted-2.svg file_taintedfilters_feDisplacementMap-tainted-3.svg file_taintedfilters_feDisplacementMap-tainted-ref.svg file_taintedfilters_feDisplacementMap-untainted-ref.svg file_taintedfilters_feDisplacementMap-untainted-1.svg file_taintedfilters_feDisplacementMap-untainted-2.svg file_taintedfilters_red-flood-for-feImage-cors.svg file_taintedfilters_red-flood-for-feImage-cors.svg^headers^ file_taintedfilters_red-flood-for-feImage.svg
[test_scroll_position_restore.html]
support-files = file_scroll_position_restore.html
[test_scroll_animation_restore.html]

128
layout/generic/test/test_scroll_animation_restore.html Normal file
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@ -0,0 +1,128 @@
<!DOCTYPE HTML>
<html>
<!--
https://bugzilla.mozilla.org/show_bug.cgi?id=1247074
-->
<head>
<meta charset="utf-8">
<title>Test for Bug 1247074</title>
<script type="application/javascript" src="/tests/SimpleTest/SimpleTest.js"></script>
<script type="text/javascript" src="/tests/SimpleTest/paint_listener.js"></script>
<link rel="stylesheet" type="text/css" href="/tests/SimpleTest/test.css"/>
<style>
.outer {
direction: ltr;
height: 400px;
width: 415px;
overflow: hidden;
position: relative;
}
.inner {
height: 100%;
outline: none;
overflow-x: hidden;
overflow-y: scroll;
position: relative;
scroll-behavior: smooth;
}
.outer.contentBefore::before {
top: 0;
content: '';
display: block;
height: 2px;
position: absolute;
width: 100%;
z-index: 99;
}
</style>
</head>
<body>
<a target="_blank" href="https://bugzilla.mozilla.org/show_bug.cgi?id=1247074">Mozilla Bug 1247074</a>
<p id="display"></p>
<div class="outer">
<div class="inner">
<ol>
<li>Some text</li>
<li>Some text</li>
<li>Some text</li>
<li>Some text</li>
<li>Some text</li>
<li>Some text</li>
<li>Some text</li>
<li>Some text</li>
<li>Some text</li>
<li>Some text</li>
<li>Some text</li>
<li>Some text</li>
<li>Some text</li>
<li>Some text</li>
<li>Some text</li>
<li>Some text</li>
<li>Some text</li>
<li>Some text</li>
<li>Some text</li>
<li>Some text</li>
<li>Some text</li>
<li>Some text</li>
<li>Some text</li>
<li>Some text</li>
<li>Some text</li>
<li>Some text</li>
<li>Some text</li>
<li>Some text</li>
<li>Some text</li>
<li>Some text</li>
<li>Some text</li>
<li>Some text</li>
<li>Some text</li>
<li>Some text</li>
<li>Some text</li>
<li>Some text</li>
<li>Some text</li>
<li>Some text</li>
<li>Some text</li>
<li>Some text</li>
<li>Some text</li>
<li>Some text</li>
<li>Some text</li>
<li>Some text</li>
<li>Some text</li>
<li>Some text</li>
<li>Some text</li>
<li>Some text</li>
<li>Some text</li>
<li>Some text</li>
<li>Some text</li>
<li>Some text</li>
</ol>
</div>
</div>
<script>
SimpleTest.waitForExplicitFinish();
window.onload = function() {
var elm = document.getElementsByClassName('inner')[0];
// Take control of the refresh driver
var utils = SpecialPowers.DOMWindowUtils;
utils.advanceTimeAndRefresh(0);
// Start a smooth scroll and advance a couple of frames so we're in the
// middle of the scroll animation
elm.scrollTop = 500;
utils.advanceTimeAndRefresh(16);
utils.advanceTimeAndRefresh(16);
// Trigger a frame reconstruction
elm.parentNode.classList.add('contentBefore');
// Reach a stable state and verify the scroll position is 500
utils.restoreNormalRefresh();
waitForAllPaintsFlushed(function() {
SimpleTest.is(elm.scrollTop, 500, "Scroll position ended up at 500");
SimpleTest.finish();
});
}
</script>
</body>
</html>