This commit changes async keyboard scrolling to be enabled only if the content to
scroll is from a selection. This works around the problem of detecting whether
an arbitrary element has key listeners that should prevent async key scrolling,
because when they have the focus we will have disabled async key scrolling.
MozReview-Commit-ID: 6HhSuGZNsMX
Focus can change at any moment in a document. This causes non-determinism and
correctness problems for doing keyboard apz scrolling. To get around this, we
will maintain deterministic behavior for focus changes initiated by input events
and see if we can get away with more non-determinism for things like `setTimeout`
In order to do this, we disable async keyboard scrolling when an input event is
processed that could have a event listener. We then attach a sequence number to
that input event and dispatch it to content. In content, we record the highest
sequence number that we have processed from an event, and send that on each focus
update. Using this, we can determine in APZ if we have a current focus target or
if we are still waiting for an input event to be processed and focus to be
reconfirmed.
MozReview-Commit-ID: CWcu8YEFQz4
This commit modifies PresShell and nsDisplayList to send a FocusTarget update on
every layer transaction. Ideally we would like to send updates as often as possible,
but this seems like it works well. This can be iterated on later, if necessary.
MozReview-Commit-ID: 8PFqIOhzH77
This commit begins the work needed for tracking focus by creating two new classes,
FocusTarget and FocusState. FocusState is created and used by APZCTreeManager to
track the global focus information, while FocusTarget is created per layer tree and
sent to APZ with local focus information. Between the two we are able to figure out
what the correct scrollable layer is to use in response to a keyboard scroll.
See the comment in `FocusState.h` for more details on the architecture and things
needed in future patches to complete this.
MozReview-Commit-ID: F75VZv3i9U2
It appears that neither Chrome, Safari or Edge support this feature,
and it's causing web-compat issues for us, e.g. bug 1373417.
MozReview-Commit-ID: AP5LMgL6QmR
I've chosen this approach mainly because there's no other good way to guarantee
the model is correct than holding the snapshots alive until a style refresh.
What I tried before this (storing them in a sort of "immutable element data") is
a pain, since we call into style from the frame constructor and other content
notifications, which makes keeping track of which snapshots should be cleared an
which shouldn't an insane task.
Ideally we'd have a single entry-point for style, but that's not the case right
now, and changing that requires pretty non-trivial changes to the frame
constructor.
MozReview-Commit-ID: FF1KWZv2iBM
It's not only inefficient, but also prone to buggyness. Since styles may not be
up-to-date when it happens.
Post a reconstruct instead, which ensures a style flush happens before running
frame construction.
MozReview-Commit-ID: DrakHsJv5fY
Signed-off-by: Emilio Cobos Álvarez <emilio@crisal.io>
We want to use a similar model as Chrome on Android does for scaling our display of web content, that is use font inflation for desktop pages and plain text zooming for everything else.
Since we don't want to simply clobber any text zoom that might have been set by the user/front-end code, we allow setting and storing the system font scale separately on the PresContext. We then calculate the effective text zoom value as the product of the system font scale and the current text zoom value.
Any function that is using the PresContext's TextZoom value for layouting/rendering is switched over to this new EffectiveTextZoom value, whereas functions that are interested in the text zoom as actually set by the user/front-end (e.g. the nsDocumentViewer, or the code responsible for copying text and full zoom settings into the new PresContext on page navigation) continue using the plain TextZoom value.
As long as font inflation is enabled in principle (e.g. font.size.inflation.minTwips != 0), every page starts out as eligible for font inflation until the relevant meta viewport tags marking the page as "mobile friendly" have been detected. Since the PresShell caches the font inflation state and only recalculates it when necessary, we make use of that and set the PresContext's system font scale as necessary whenever the font inflation state has been refreshed.
MozReview-Commit-ID: 2InyE04wKAW
We added this so that MozAfterPaint events would be delivered to hidden documents as part of bug 539356, but I don't remember what needed it.
It doesn't appear to be necessary for any tests any more, so let's just get rid of it
MozReview-Commit-ID: HcmIjstZyLQ
Prior to this patch, dumping of style contexts in the layout
debugger would only dump the subtree associated with the root
frame, which just covers the viewport, canvas, and associated
scrollbars.
I think this has been broken since bug 236921 (2004) and
bug 378693 (2007) properly disconnected the root element from the
styles for the viewport and canvas.
This patch just manually dumps the root frame and the root
element's frame, since the style set no longer maintains a list
of all of the style context roots.
MozReview-Commit-ID: 5LEnbNtngN2
