This patch also extends the tests for Element.getAnimations(). It doesn't
actually exercise the code added (it's not actually called yet since it doesn't
need to be for Element.getAnimations) but simply provides a useful regression
and interop test.
--HG--
extra : commitid : KWpAsc2Aj54
extra : rebase_source : abe26dc3d79a50239c62dd156dc0a0aa29c11d52
This patch re-uses Animation::mSequenceNum to store the index of CSS animations
within their corresponding animation-name property. When the animation is
removed from an animation-name property it reverts to using the default
animation composite order.
This patch also updates Animation::DoCancel to call UpdateTiming instead of
UpdateEffect. This is because UpdateTiming is responsible for updating the
sequence number (when custom composite order is not in effect). When we remove
an animation from animation-name it will be cancelled and at that point we
expect its sequence number to be cleared which will only happen if
UpdateTiming gets called.
--HG--
extra : commitid : 2KrTezItH3q
extra : rebase_source : 50de87465deef85558ca50de5e6286f7b5603051
Add a virtual method we can use to determine when an animation is having its
sequence number set by some other mechanism than the general logic
defined for animations.
This allows CSS animations and transitions to re-use the sequence number for
their own purposes. Typically what will happen is something like this:
1. A CSSAnimation is created corresponding to an item in the animation-name
property.
At this point CSSAnimation::IsUsingCustomCompositeOrder() will return true
and nsAnimationManager will set the sequence number based on the position of
the animation in animation-name.
2. If at a later point the animation is removed from the animation-name but kept
alive by script, CSSAnimation::CancelFromStyle will be called which will
clear the custom sequence number (i.e. set it to kUnsequenced) and also
update the CSSAnimation's state such as
CSSAnimation::IsUsingCustomCompositeOrder() returns false.
3. Then, then the CSSAnimation next transitions out of the idle state it will
have its sequence number set just like any other Animation and be ordered
like any other Animation (since we can no longer use animation-name to
determine its composite order).
This behavior is added in subsequent patches in this series (and likewise for
CSS transitions too).
--HG--
extra : commitid : B8nPFXzQMfF
extra : rebase_source : 42439fb1dd32a789e270dc0c51af2c660f4593eb
This patch introduces a method that will be used for sorting animations based on
their composite order. The method is based on the API for Comparator objects (as
used by nsTArray and co.) which have a LessThan method. (For the
Comparator::Equals method we can used pointer equality since no two independent
objects should have equal composite order.)
--HG--
extra : commitid : 88oD4UFx5to
extra : rebase_source : 1b30272451c189161a08efac3da48d72e10d8e52
Web Animations defines Animations as having a globally unique sequence number
for the purpose of prioritization:
http://w3c.github.io/web-animations/#animation-sequence-number
As of the writing of this patch, the spec says the sequence number is updated
when the Animation is created. This is problematic and I have proposed that
actually this should be updated from each transition from idle:
https://lists.w3.org/Archives/Public/public-fx/2015AprJun/0054.html
This doesn't seem to have met any opposition so I will update the spec to
reflect this soon.
This patch implements the behavior of updating the sequence number on each
transition from idle.
To make sure we perform this on each change to timing this patch removes
a couple of instances of early returns to ensure that UpdateTiming is called.
The current maximum sequence number is simply a class static and we make no
attempt to deal with wraparound. This is because we only update this number when
an animation transitions from idle which only happens when an animation is
created or script calls cancel() followed by play() on the animation. Supposing
that across all content this happenned an unlikely 1 billion times a second we
still wouldn't exhaust the range of the unsigned 64-bit int for about 585 years.
We'd like to make kUnsequenced be zero and make the static represent the
current maximum. This would probably be easier to understand and recognize in
a debugger. However, later in this patch series we will make CSS animations and
CSS transitions override this sequencing behavior. If we define kUnsequenced
to be zero and they accidentally assign zero as an actual sequence number then
they'll run into trouble. To avoid that we set kUnsequenced to UINT64_MAX.
--HG--
extra : commitid : DMw8uKjg4Hz
extra : rebase_source : 9e98b3346f0297efce3ecfa0b2dd8a9c13075dca
These will be needed for sorting animations and transitions in a const-correct
fashion.
--HG--
extra : commitid : BhuFfkAvse7
extra : rebase_source : a97039f06b9f257ccb9b6aa206653d6b5d5d43d4
In order to sort CSS animation objects correctly, we need to know which
element's animation-name property they appear in, if any. Normally that's
simply the target element of the animation's keyframe effect but it can differ
in the following cases:
1) When script modifies a CSSAnimation's effect to target a different element
(or simply removes the effect altogether). In this case we use the
*owning* element to determine the priority of the animation, not the target
element.
This scenario does not yet occur (bug 1049975).
2) When script creates a CSSAnimation object using the CSSAnimation constructor.
In this case, the owning element should be empty (null) and we should
determine the priority of the animation in the same way as any other
Animation object.
Again, this is not yet supported (or even specced) but will be eventually.
3) When script holds a reference to a CSSAnimation object but then updates the
animation-name property such that the animation object is cancelled. In this
case the owning element should be cleared (null) so we know to not to try and
sort this with regard to any animation-name property.
This is possible using code such as the following:
elem.style.animation = 'a 5s';
var a = elem.getAnimations()[0];
elem.style.animation = 'b 5s';
a.play(); // Bring a back to life
document.timeline.getAnimations();
// ^ At this point we need to know how to sort 'a' and 'b' which depends
// on recognizing that a is no longer part of an animation-name list.
Until we implement bug 1049975, we could support sorting animations without
adding the reference to the owning element by setting a flag on the CSSAnimation
object but (having tried this) it turns out to be cleaner to just introduce this
reference now, particularly since we know we will need it later.
Note that we will also need this information in future to dispatch events to the
correct element in circumstances such as (1) once we separate updating timing
information (including events) from applying animation values.
--HG--
extra : commitid : 8o9bf6l7kj7
extra : rebase_source : 391a4e8769cc96584ebd625d4b1d0e873373fd41
Prior to this patch we cancel animations in AnimationCollection::Destroy but
this is not called automatically when the property holding the collection is
destroyed via its destructor. When an element is unbound from the tree we
destroy its animation properties but don't call AnimationCollection::Destroy.
This means, that in such circumstances:
* We won't create animation mutation records for the removed animations
* Once we start registering animations with a timeline they won't have a
chance to remove themselves from the timeline (meaning
document.timeline.getAnimations()) will keep returning them
* Once we go to implement the animationcancel and transitioncancel events we
won't fire them in this case (assuming we implement the queueing/dispatch of
those events as part of the cancel code)
This patch addresses this by moving the call to cancel each animations to the
property destructor for the animation properties.
We do this first so we can land this change separately to ease bisecting any
regressions it might trigger.
--HG--
extra : commitid : KzukSO91RMH
extra : rebase_source : 54ed2aeb69d8bceca424c70c7f33d4bf92d54546
We have already resolved to make calling Finish() clear the pause state (see
https://lists.w3.org/Archives/Public/public-fx/2015AprJun/0038.html, item 2).
Doing that involves resolving the start time when the animation is paused.
Furthermore, as a separate change, we resolved to make the finished promise not
resolve when the animation is paused. That suggests making UpdateFinishedState()
only resolve the finished promise when PlayState() == Finished rather than using
IsFinished() which returns true even if the animation is paused.
However, if we compare PlayState() == Finished in UpdateFinishedState() then we
will *not* resolve the finished promise when the animation is play-pending since
PlayState() == Pending in that case (pause-pending is ok since the call to
SetCurrentTime will cause a transition to the Paused state). Furthermore, the
existing call to cancel the pending play task will effectively leave this
animation forever pending. Hence, in this patch we unconditionally fill in the
start time.
--HG--
extra : rebase_source : 499ad0530eac0ee62c8ed2df41360c45abc34816
This is much easier to read at call sites and prevents accidentally using the
default value when another value might be more suitable.
--HG--
extra : rebase_source : b1c05d8bf7b97744e53f2ecc676561f3a4a80888
The point of making pausing async is to allow time to sync up the current time
with the compositor. Setting the current time manually should simply force it to
the specified time and complete the pause action, not abort it. (We do a similar
thing for a pending play. For a pending play we're waiting to establish
a suitable start time. Manually setting the start time in that case simply
forces the start time to the specified time and completes the play operation.)
--HG--
extra : rebase_source : 614ed9ef01204e4137783c0d48e975eb8febbe2a
Animation::ResumeAt contains an assertion that, when we exit the play-pending
state, checks we either have a resolved start time or a resolved hold time.
That's normally true but if we are aborting a pause on animation that is
finished we can end up with a resolved start time (since we don't clear the
start time when we're aborting a pause) and a resolved hold time (either
because the regular finishing behavior set one, or, because play() applied
auto-rewinding behavior and set it).
In that case we should actually respect the hold time and update the start time
when resuming the animation. However, ResumeAt won't update the start time if it
is already set.
This patch fixes that by clearing the start time in DoPlay in the case where we
are aborting a pause and have a hold time.
--HG--
extra : rebase_source : 83f980d6cbc34375274f30f6527992b4fec7f639
This patch makes Cancel() call PostUpdate which clobbers certain state in style
so that animated style is correctly flushed when an animation is cancelled.
The main difficulty with this is that we *don't* want to call this when we're
cancelling an animation as a result of a style update or else we'll trigger
needless work. The pattern elsewhere has been to define a *FromStyle() method
for this case (e.g. CSSAnimation::PlayFromStyle, PauseFromStyle). This isn't
ideal because there's always the danger we will forget to call the appropriate
*FromStyle method. It is, however, consistent. Hopefully in bug 1151731 we'll
find a better way of expressing this.
