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// Copyright 2015 Google Inc. All Rights Reserved.
//
// Licensed under the Apache License, Version 2.0 (the "License");
// you may not use this file except in compliance with the License.
// You may obtain a copy of the License at
//
// http://www.apache.org/licenses/LICENSE-2.0
//
// Unless required by applicable law or agreed to in writing, software
// distributed under the License is distributed on an "AS IS" BASIS,
// WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
// See the License for the specific language governing permissions and
// limitations under the License.
#include "base/logging.h"
#include "cobalt/web_animations/animation.h"
#include "cobalt/web_animations/keyframe_effect_read_only.h"
namespace cobalt {
namespace web_animations {
Animation::Animation(const scoped_refptr<AnimationEffectReadOnly>& effect,
const scoped_refptr<AnimationTimeline>& timeline)
: effect_(effect) {
const KeyframeEffectReadOnly* keyframe_effect =
base::polymorphic_downcast<const KeyframeEffectReadOnly*>(effect.get());
if (keyframe_effect) {
keyframe_effect->target()->Register(this);
}
set_timeline(timeline);
}
void Animation::set_timeline(const scoped_refptr<AnimationTimeline>& timeline) {
if (timeline_) {
timeline_->Deregister(this);
}
if (timeline) {
timeline->Register(this);
}
timeline_ = timeline;
}
// https://www.w3.org/TR/2015/WD-web-animations-1-20150707/#playing-an-animation-section
void Animation::Play() {
// This is currently a simplified version of steps 8.2.
if (timeline_) {
DCHECK(timeline_->current_time());
if (!data_.start_time()) {
set_start_time(timeline_->current_time());
}
}
UpdatePendingTasks();
}
// https://www.w3.org/TR/2015/WD-web-animations-1-20150707/#cancel-an-animation
void Animation::Cancel() {
// 5. Make animation's start time unresolved.
data_.set_start_time(base::nullopt);
UpdatePendingTasks();
}
base::optional<base::TimeDelta> Animation::current_time_as_time_delta() const {
if (!timeline_) {
return base::nullopt;
}
return data_.ComputeLocalTimeFromTimelineTime(
timeline_->current_time_as_time_delta());
}
// https://www.w3.org/TR/2015/WD-web-animations-1-20150707/#the-current-time-of-an-animation
base::optional<double> Animation::current_time() const {
base::optional<base::TimeDelta> current_time = current_time_as_time_delta();
return current_time ? base::optional<double>(current_time->InMillisecondsF())
: base::nullopt;
}
namespace {
base::TimeDelta ScaleTime(const base::TimeDelta& time, double scale) {
return base::TimeDelta::FromMillisecondsD(time.InMillisecondsF() * scale);
}
} // namespace
// https://www.w3.org/TR/2015/WD-web-animations-1-20150707/#the-current-time-of-an-animation
base::optional<base::TimeDelta>
Animation::Data::ComputeLocalTimeFromTimelineTime(
const base::optional<base::TimeDelta>& timeline_time) const {
// TODO: Take into account the hold time.
if (!timeline_time || !start_time_) {
return base::nullopt;
}
return ScaleTime(*timeline_time - *start_time_, playback_rate_);
}
base::optional<base::TimeDelta>
Animation::Data::ComputeTimelineTimeFromLocalTime(
const base::optional<base::TimeDelta>& local_time) const {
if (!start_time_ || !local_time) {
return base::nullopt;
}
if (local_time == base::TimeDelta::Max()) {
return base::TimeDelta::Max();
}
return ScaleTime(*local_time, 1.0 / playback_rate_) + *start_time_;
}
// https://www.w3.org/TR/2015/WD-web-animations-1-20150707/#setting-the-current-time-of-an-animation
void Animation::set_current_time(const base::optional<double>& current_time) {
UNREFERENCED_PARAMETER(current_time);
NOTIMPLEMENTED();
}
Animation::~Animation() {
const KeyframeEffectReadOnly* keyframe_effect =
base::polymorphic_downcast<const KeyframeEffectReadOnly*>(effect_.get());
if (timeline_) {
timeline_->Deregister(this);
}
if (keyframe_effect) {
keyframe_effect->target()->Deregister(this);
}
}
void Animation::UpdatePendingTasks() {
if (!effect_) {
return;
}
base::TimeDelta end_time_local =
effect_->timing()->data().time_until_after_phase(base::TimeDelta());
base::optional<base::TimeDelta> end_time_timeline =
data_.ComputeTimelineTimeFromLocalTime(end_time_local);
// If the local time is unresolved, then we cannot know when we will enter
// the "after phase".
if (end_time_timeline &&
*end_time_timeline >= *timeline_->current_time_as_time_delta() &&
*end_time_timeline != base::TimeDelta::Max()) {
// Setup the "upon entering the after phase" event to fire at the
// specified timeline time.
on_enter_after_phase_ = timeline_->QueueTask(
*end_time_timeline,
base::Bind(&Animation::OnEnterAfterPhase, base::Unretained(this)));
} else {
// We are already in the after phase, so clear this task.
on_enter_after_phase_.reset();
}
}
void Animation::OnEnterAfterPhase() {
if (event_handlers_.empty()) return;
// Since this method is called via callback, and since one of the
// event handlers it calls may result in the destruction of the
// animation, the following line ensures the animation stays constructed
// until we are done firing the callbacks.
scoped_refptr<Animation> this_animation(this);
// We start by making a copy of the set of event handlers we will call, in
// case this set is modified while we are calling them.
event_handlers_being_called_ = event_handlers_;
// When we enter the after phase, let all registered event handlers know.
while (!event_handlers_being_called_.empty()) {
EventHandler* event_handler = *event_handlers_being_called_.begin();
event_handlers_being_called_.erase(event_handlers_being_called_.begin());
if (!event_handler->on_enter_after_phase().is_null()) {
event_handler->on_enter_after_phase().Run();
}
}
}
scoped_ptr<Animation::EventHandler> Animation::AttachEventHandler(
const base::Closure& on_enter_after_phase) {
// Attaches an event handler to this animation and returns a handle to it.
scoped_ptr<Animation::EventHandler> event_handler(
new Animation::EventHandler(this, on_enter_after_phase));
event_handlers_.insert(event_handler.get());
return event_handler.Pass();
}
void Animation::RemoveEventHandler(EventHandler* handler) {
// Called when the EventHandler object is destructed, this "deregisters"
// the event handler from the Animation's event handler set.
std::set<EventHandler*>::iterator found = event_handlers_.find(handler);
DCHECK(found != event_handlers_.end());
event_handlers_.erase(found);
// If the event handler is while we are dispatching a list of event handlers,
// then remove it from that list as well so that we don't call it.
event_handlers_being_called_.erase(handler);
}
} // namespace web_animations
} // namespace cobalt