AnimationPlayer::CanThrottle determines if an animation player has just finished
by inspecting the value of mLastNotification. This is problematic for two
reasons:
1. mLastNotification is intended to be used for events (as the XXX comment
notes)
2. mLastNotification is specific to CSS Animations and should be moved to
CSSAnimationPlayer.
To address this, this patch adds an extra member mIsPreviousStateFinished. The
Web Animations spec already defines animation players as having such a member:
http://w3c.github.io/web-animations/#previous-finished-state
We set it to true when we calculate the style for an animation that has
finished. This differs slightly from the code it is replacing as explained
below.
In the case of CSS Animations we perform the following sequence of steps on each
sample.
1. EnsureStyleRuleFor (calls CanThrottle, and maybe ComposeStyle)
2. GetEventsForCurrentTime
In the existing code, we update mLastNotification in (2) which happens on every
sample, even throttled samples.
In this patch, however, we update mIsPreviousStateFinished in (1) during the
ComposeStyle step which only happens for unthrottled samples. So, as of this
patch, in CanThrottle, we ask "have we newly entered the finished state since
the last *unthrottled* sample?", whereas previously we simply looked for
a change since the last sample, throttled or not. However, if the answer to the
question is "yes", then we'll run an unthrottled sample and update
mIsPreviousStateFinished so these should be functionally equivalent.
Another subtle difference is that this patch looks at the player's finished
state rather than the animation phase of its source content, and these will
produce different results in the case where the player is paused. However, since
paused animations are not run on the compositor, this should not matter.
In the case of CSS Transitions, AnimationPlayer::CanThrottle() is not currently
used and so mIsPreviousStateFinished is irrelevant.
Ultimately, both the existing and the new code is somewhat fragile but hopefully
this will be addressed by:
* Replacing mIsPreviousStateFinished with inspecting whether the finished
promise is settled (bug 1074630),
* Merging more of the code in nsAnimationManager and nsTransitionManager and
applying a unified approach to sampling that better accommodates these
considerations.
This patch takes the CSSAnimationPlayer object, currently defined in
dom/animation/AnimationPlayer.{cpp,h}, and moves it to
layout/style/nsAnimationManager.{cpp,h} where the rest of the CSS
Animations-specific code lives.
At the same time it extends the scope of the mozilla namespace block in
nsAnimationManager.h to also include the AnimationEventInfo and EventArray types
since these classes, which don't have an ns* prefix, probably should be in the
mozilla namespace anyway.
This patch extracts the logic for calculating animation styles from
AnimationPlayerCollection and puts the bulk of it into the Animation objects.
Some of the initial logic surrounding the animation player state (e.g. is it
paused or not, etc.) is put into AnimationPlayer.
In future we may shift this logic even further down to the AnimationEffect
objects but currently we don't create such objects unless necessary.
This patch moves code from AnimationPlayerCollection to AnimationPlayer.
However, there is one subtle change in logic involved. Previously, we would test
if the player had finished by getting the computed time of its source content
and checking if it was in the after phase or not. In this patch, however, we
simply check the play state to see if it is finished or not.
These two approaches differ in the case where an animation is paused after it
has finished. The animation phase approach will indicate the player has
finished, but the play state approach will indicate the player has paused (since
the "paused" state trumps the "finished" state). This, however, should not
produce any observable effect because when an animation is paused
mIsRunningOnCompositor will be false (we don't put paused animations on the
compositor).
This patch uses the PlayFromStyle/PauseFromStyle methods on CSSAnimationPlayer
to perform play/pause control. (This allows us to encapsulate mHoldTime and
mPaused. We will encapsulate mStartTime etc. in subsequent bugs.
The override behavior of play()/pause() with regard to animation-play-state is:
* pause()/play() override the current animation-play-state
* pause() causes the player to remain paused until play() is called regardless
of changes to animation-play-state
(* Calling play() will override the animation-play-state but won't "stick". i.e.
subsequently setting animation-play-state: paused will pause the animation.)
These different permutations are tested in the next patch in this series.
This interaction will probably become more complicated once we introduce
finishing behavior (since we might not want animations to restart when
setting animation-play-state: running).
When an animation player is paused by script this overrides whatever
animation-play-state is set by style. The logic for producing the correct
override behavior will be added to nsAnimationManager but first we need
to record in the player where it was paused.
This patch introduces a CSSAnimationPlayer subclass of AnimationPlayer. This is
because when we have an animation player running a CSS animation it has some
special behavior not needed in the general case such as:
* Flushing style before performing certain operations to ensure we are using
the latest information.
* Dispatching CSS Animation events when we start/end.
* Storing extra state with regards to "how" the animation was paused.
This is because, for example, if an animation is paused by script this
overrides specified style.
This patch introduces the basic implementation of play() and pause().
There are a lot of gaps still because we don't yet:
* Support the pending state (to be covered in bug 927349)
* Support finishing behavior (to be covered in bug 1074630)
* Have a good way of updating animation state outside of style resolution (bug
1073336)
Also, we don't call these methods from CSS yet because the interaction between
play()/pause() and animation-play-state requires storing some extra state which
we introduce in subsequent patches in this series.
This patch introduces, temporarily, an update flag to indicate whether
play()/pause() operations need to post a restyle event. When these methods are
triggered by processing restyles we don't want to post another (unnecessary)
restyle event. In bug 1073336 we will remove the need for this.
We only need to store if an animation is paused or not, hence a bool is
sufficient. Furthermore, the convenience of using the same type as the specified
style of animation-play-state will disappear once pausing behavior is wrapped up
behind Play() and Pause() methods.
This patch makes Element::GetAnimationPlayers return not only current animations
but also animations that have finished but are filling forwards. This brings the
implementation into line with recent changes to the Web Animations spec and
allows querying all the animations that are currently affecting an element or
which are scheduled to do so in the future.
It's not the player that's "current" (a Web Animations term for an animation
that hasn't yet finished), but its source content, if any. This patch renames
the method on AnimationPlayer accordingly.
At the same time this patch moves the method to the header file since it's
quite simple and could possibly benefit from inlining.
This patch stores the animation name on the Animation object rather than its
AnimationPlayer. This is because Animation objects don't have a reference to
their AnimationPlayer but their AnimationEffect needs access to the animation
name.
This patch also adds an accessor for AnimationPlayer to get the name from its
Animation (since players *do* have a reference to their source animation
content).
The assertion in nsTimeStamp::operator >= occasionally fails due to a null RHS
timestamp when called from AnimationPlayer::GetCurrentTimeDuration, which, in
turn, is called from AnimationPlayer::SetSource.
The issue appears to be that we're not correctly initializing
AnimationPlayer.mPlayState. This value can be running (0) or paused (1) but we
only ever compare against the paused state (i.e. every other value is
effectively treated as running). If we don't initialize this we can end
up in the paused state but with mPauseStart not set to a valid (non-null)
TimeStamp. This creates an inconsistent state since we assume that when we're
paused mPauseStart is non-null, hence the assertion fails.
This gets tickled because, since bug 1040543, we call
AnimationPlayer::SetSource from nsAnimationManager::BuildAnimations *before* we
set mPlayState and mPauseStart.
This patch initializes mPlayState to the running state so we don't accidentally
end up in an inconsistent state.
It also removes some (now unnecessary) initialization of mPlayState and
mPauseStart from nsTransitionManager::ConsiderStartingTransition.
In future we could also consider reworking nsAnimationManager::BuildAnimations
so that we call SetSource on the new animation player *after* setting up its
play state. That may be more correct and would further avoid this problem but
may not be necessary since all that code is likely to change in the near future.
This patch changes the inheritance of ElementPropertyTransition so that it is
a subclass of Animation not AnimationPlayer.
The only thing special about ElementPropertyTransition is it stores some extra
state for reversing transitions and an extra ValuePortionFor convenience method.
This reversing behavior is implemented by the transition manager by creating
a new AnimationPlayer (i.e. it is *not* a property of the AnimationPlayer). As
a result this extra state can be pushed down to Animation which simplifies the
code significantly.
In future if we implement KeyframeEffect as a separate object we may be able to
push transition-specific state down to KeyframeEffect instead.
In this fourth step of dividing functionality between AnimationPlayer and
Animation, we move the mIsLastNotification and related methods/enums from
AnimationPlayer to Animation.
It is somewhat unclear where this belongs. This member is used to determine
which event to send for CSS Animations. The thinking behind moving this to
Animation is that if an animation that has already dispatched its animationstart
event was transferred to a new animation player with a similar current time then
I think it is expected that such an animation would *not* dispatch another
animationstart event. That suggests that event-state is a property of the
Animation not the AnimationPlayer.
Obviously, this needs to be defined somewhere (namely, the CSS Animations <->
Web Animations integration spec likely to become "CSS Animations Level 4"). Once
that behavior is agreed upon, if AnimationPlayer proves to be the more suitable
home for this member then it should be relatively straightforward to move the
member back at that time.
As the third step in dividing functionality between AnimationPlayer and
Animation this patch moves the mIsFinishedTransition member and related methods
from AnimationPlayer to Animation.
At the same time we rename SetFinishedTransition to SetIsFinishedTransition.
As the second step in dividing functionality between AnimationPlayer and
Animation, this patch moves the AnimationTiming member from AnimationPlayer to
Animation.
Most of this patch is simply moving code around. However, one significant
functional difference is that Animation::GetLocalTime() uses the mParentTime
member which is set when the Animation is updated by the player it is attached
to.
Other less significant differences are:
* AnimationPlayer::GetLocalTime is renamed to GetCurrentTimeDuration
In Web Animations, animation players have a (writeable) "current time" and
animations have a (read-only) "local time".
We would call the method simply "GetCurrentTime" (instead of
"GetCurrentTimeDuration") but GetCurrentTime is the name of the method used in
the content-facing API where it returns a double.
* "IsCurrent" is defined on both AnimationPlayer and Animation with the version
in AnimationPlayer serving mostly as a convenience shortcut to the version on
Animation.
* Animation::GetComputedTiming (previously on AnimationPlayer) now makes the
timing parameter optional since most of the time it is not needed.
As the first step in dividing the functionality currently contained in
AnimationPlayer between AnimationPlayer and Animation this patch moves the set
of keyframe properties to the Animation.
These properties are returned from the Animation by a couple of Properties()
methods that provide direct access to the member variable. In future it is
anticipated that the non-const version will be replaced with an appropriate
setter function. This will likely happen when we implement a separate
KeyframeEffect object as defined by the Web Animations API.
With regards to error checking, nsAnimationManager checks the result of
AnimationPlayer::GetSource() and handles the case where it is nullptr.
nsTransitionManager, however, simply asserts that GetSource() is never null much
like it also asserts that there is only one property with one segment in the
animation. Eventually this code should be made more generic which will probably
happen in bug 999927.
This patch makes AnimationPlayers pass their current time down to the Animation
they are playing.
Since all Animations need from their players is their time, this avoids adding
a pointer back to their AnimationPlayer.
This patch renames mozilla::ElementAnimations to mozilla::dom::AnimationPlayer
and moves the code from layout/style/AnimationCommon.cpp to
dom/animation/AnimationPlayer.cpp.
It also moves various helper classes needed by AnimationPlayer to
AnimationPlayer.cpp and moves them from the mozilla::css namespace to the
mozilla namespace.
Beyond that, there are no functional changes contained in this patch.
The renaming of various members and variables that used to refer to
ElementAnimation objects but now refer to AnimationPlayer objects--to give them
a more appropriate name--is performed in a subsequent patch.
--HG--
rename : layout/style/AnimationCommon.cpp => dom/animation/AnimationPlayer.cpp
rename : layout/style/AnimationCommon.h => dom/animation/AnimationPlayer.h
