This is a follow-up for Part 1. I find all the candidates by running the
following command under layout/, and manually replace them.
ag -A 1 reflow$ | ag -B 1 state
Differential Revision: https://phabricator.services.mozilla.com/D27162
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extra : moz-landing-system : lando
nsHTMLReflowState was renamed to ReflowInput in bug 1277129, so remove
the "Html" in the variable name.
Also, remove the comment "ReflowBlock will initialize it." because
ReflowInput::Init() is called in the constructor. We are not using
ReflowInput::CALLER_WILL_INIT flag here.
Differential Revision: https://phabricator.services.mozilla.com/D27024
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extra : moz-landing-system : lando
This patch extracts two additional CompositorHitTestInfo flags from the
eDispatchToContent flag; eApzAwareListeners for elements that have
APZ-aware listeners, and eInactiveScrollframe for inactive scrollframe
or unlayerized scrollthumbs. The eDispatchToContent is then renamed to
eIrregularArea to reflect the fact that it is used for irregular-shaped
areas that require main-thread hit-testing.
Additionally, it is important to note that when using the non-WebRender
codepath, all three of these flags still end up gettings squashed into
the "dispatch to content" region on the EventRegions; when APZ
reconstructs a CompositorHitTestInfo it will turn anything in this
region back into an eIrregularArea. So this is a lossy round-trip
conversion for the non-WebRender case. However it should still result in
correct behaviour because the semantics of eIrregularArea result in APZ
relying on the main-thread to do hit-testing and so any APZ-aware
listeners and inactive scrollframes are also handled by the main-thread.
Differential Revision: https://phabricator.services.mozilla.com/D26440
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extra : moz-landing-system : lando
In the case where scroll-snap-type is specified for the scroll container, the
scroll-padding is also factored into in ScrollFrameHelper::ComputeScrollSnapInfo
which is called via ScrollFrameHelper::ScrollToWithOrigin. It doesn't double
the scroll-padding value, but it's actually redundant, we should avoid it.
We could separate the functionality of ScrollToWithOrigin, one is to scroll
to a given element, the other is to scroll to a given position. The former will
be used for Element.scrollIntoElement and relevant stuff, the latter will be
used for Element.scrollTo and relevant stuff. That's being said, as of now, we
have still the old scroll snap implementation, so the separation will introduce
complexity, the separation should be done once after the old implementation
removed.
There are 9 call sites of nsIPresShell::ScrollContentIntoView:
nsIPresShell::GoToAnchor
nsIPresShell::ScrollToAnchor
Element::ScrollIntoView
We definitely needs scroll-padding and scroll-margin for these functions.
nsCoreUtils::ScrollTo
This is used for Accesible::ScrollTo which scrolls to a given accesible node,
probably we should behave as what Element::ScrollIntoView does.
Accessible::DispatchClickEvent
Similar to the above, similated various mouse events on a given target node.
PresShell::EventHandler::PrepareToUseCaretPosition
PresShell::EventHandler::GetCurrentItemAndPositionForElement
Both are for context menu, we shouldn't consider scroll-padding and
scroll-margin.
nsFormFillController::SetPopupOpen
This is used for autocompletion popup, we shouldn't consider scroll-padding
and scroll-margin.
nsFocusManager::ScrollIntoView
This is bit unfortunate, we should use scroll-padding and scroll-margin
depending on call site of this function. Bug 1535232 is for this case.
cssom-view/scrollIntoView-scrollPadding.html which has some tests that is
actually testing scroll-padding with scrollIntoView passes with this change.
The reftest in this change is a test case that the browser navigates to an
element with specifying the anchor to the element.
Differential Revision: https://phabricator.services.mozilla.com/D23084
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extra : moz-landing-system : lando
As for scrolling on the compositor we don't cull out them since we don't know
the final snapport rect at the time when we send the information about
snapping to the compositor. And we will handle it for APZ in bug 1531589.
https://drafts.csswg.org/css-scroll-snap-1/#snap-scope
Depends on D21632
Differential Revision: https://phabricator.services.mozilla.com/D21633
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extra : moz-landing-system : lando
https://drafts.csswg.org/css-scroll-snap-1/#scroll-snap-align
The main logic here is basically same as the old scroll snap implementation,
just iterating over all descendant elements in the scroll container and collect
snap positions. The differences are;
1) the snap positions are specified based on descendant elements instead of
points
2) the snap positions are able to be specified by `block` or `inline` keywords
so that we also need to care the element flow.
more test cases for this are coming in the next commit
3) the target rect is calculated by nsLayoutUtils::TransformFrameRectToAncestor
which means transform is already taken account into it (we have a bug for
the old scroll snap, it's bug 1218745)
some of web platform tests will be added in a subsequent commit
Some of test cases in overflowing-snap-areas.html that accidentally have
passed start failing with this change, all of them will be passed with
subsequent changes in these commit series.
Depends on D21627
Differential Revision: https://phabricator.services.mozilla.com/D21628
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extra : moz-landing-system : lando
From the spec [1];
Using the scroll-snap-type property on the relevant scroll container, the
author can request a particular bias for the scrollport to land on a snap
position after scrolling operations (including programmatic scrolls such
as the scrollTo() method).
The target here are functions exposed in web contents other than
Element.scrollIntoView which will be changed in the next commit.
[1] https://drafts.csswg.org/css-scroll-snap-1/#overview
Depends on D21624
Differential Revision: https://phabricator.services.mozilla.com/D21625
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extra : moz-landing-system : lando
There are some that only have one caller, and some slightly confusing naming.
Hopefully make it a bit clearer.
Differential Revision: https://phabricator.services.mozilla.com/D25457
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extra : moz-landing-system : lando
This switches nsFrameSetFrame's hacky frame construction codepath to operate on
the flattened tree, since it made me a bit more comfortable about it (all layout
should operate on is the flattened tree, though in this cause this should not
cause any web-observable behavior change, since <frameset> can't be a shadow
host per spec, and we no longer support XBL-in-content).
That doesn't need to compute styles lazily. You only need to compute styles
lazily in descendants of display: none elements, and even though this code
doesn't check on display: none _on the children_, the parent element should
never have display: none (since we're creating an nsFrameSetFrame for it).
There are other places that still call into this (apart from getComputedStyle).
One is nsImageFrame's cursor code. Given the <area> elements referencing an
image map could be anywhere, we need to have lazy computation here.
The other is the viewport style propagation stuff. There shouldn't be a need for
LazyComputeBehavior::Allow on the document element in order to check the
viewport styles propagation, since the root element can't have display: none
ancestors. But we run that code before actually constructing the doc element
containing block, which is when we do the initial document styling.
We could remove that with some more effort, but it's not worth it right now,
since we need to keep using it for the <body>, since the document element could
be display: none itself, and we propagate the overflow styles in that case
still. I filed https://github.com/w3c/csswg-drafts/issues/3779 to potentially
change that.
Differential Revision: https://phabricator.services.mozilla.com/D25455
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extra : moz-landing-system : lando
We don't have lossy currentcolor in the style system anymore, except for a
single property -moz-font-smoothing-background-color.
I could've converted it into a proper StyleColor and thread down all the
necessary information to the font metrics code.
But it doesn't really seem worth it given it's not exposed to the web, so I just
did the simplest thing, which is making currentcolor compute to transparent to
that specific property.
This patch also removes the stores_complex_colors_lossily code and related,
since now we always can cache computed colors.
Differential Revision: https://phabricator.services.mozilla.com/D26187
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extra : moz-landing-system : lando
Except retrieving from weak reference, `nsIFrame` should treat
`mozilla::PresShell` directly rather than via `nsIPresShell`.
Differential Revision: https://phabricator.services.mozilla.com/D26388
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extra : moz-landing-system : lando
nsFrameLoaderOwner::UpdateRemoteness will recreate the nsFrameLoader for a
piece of content. As part of this, it will unset the cached nsFrameLoader for
the content's nsSubdocumentFrame. However we need to run ShowViewer() for the
new nsFrameLoader as the frame has already been initialized. In addition,
dimensions and position on the new nsFrameLoader need to be set. Usually this
is done after a reflow, but there's no guarantee a reflow will happen after
a UpdateRemoteness operation.
Differential Revision: https://phabricator.services.mozilla.com/D25662
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extra : moz-landing-system : lando
nsIPresShell.h is widely included, so this avoids excessively long rebuilds
when MobileViewportManager.h is modified.
Differential Revision: https://phabricator.services.mozilla.com/D26245
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extra : moz-landing-system : lando
We don't have lossy currentcolor in the style system anymore, except for a
single property -moz-font-smoothing-background-color.
I could've converted it into a proper StyleColor and thread down all the
necessary information to the font metrics code.
But it doesn't really seem worth it given it's not exposed to the web, so I just
did the simplest thing, which is making currentcolor compute to transparent to
that specific property.
This patch also removes the stores_complex_colors_lossily code and related,
since now we always can cache computed colors.
Differential Revision: https://phabricator.services.mozilla.com/D26187
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extra : moz-landing-system : lando
