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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#include <deque>
#include <vector>
#include "base/compiler_specific.h"
#include "base/gtest_prod_util.h"
#include "base/macros.h"
#include "base/memory/linked_ptr.h"
#include "base/memory/ref_counted.h"
#include "base/observer_list.h"
#include "base/time/time.h"
#include "cc/animation/animation_delegate.h"
#include "cc/trees/target_property.h"
#include "ui/compositor/compositor_export.h"
#include "ui/compositor/layer_animation_element.h"
#include "ui/compositor/layer_threaded_animation_delegate.h"
#include "ui/gfx/animation/tween.h"
namespace cc {
class Animation;
class AnimationPlayer;
class AnimationTimeline;
class Layer;
namespace gfx {
class Animation;
class Rect;
class Transform;
namespace ui {
class Compositor;
class Layer;
class LayerAnimationSequence;
class LayerAnimationDelegate;
class LayerAnimationObserver;
class LayerAnimatorCollection;
class ScopedLayerAnimationSettings;
// When a property of layer needs to be changed it is set by way of
// LayerAnimator. This enables LayerAnimator to animate property changes.
// NB: during many tests, set_disable_animations_for_test is used and causes
// all animations to complete immediately. The layer animation is ref counted
// so that if its owning layer is deleted (and the owning layer is only other
// class that should ever hold a ref ptr to a LayerAnimator), the animator can
// ensure that it is not disposed of until it finishes executing. It does this
// by holding a reference to itself for the duration of methods for which it
// must guarantee that |this| is valid.
class COMPOSITOR_EXPORT LayerAnimator
: public base::RefCounted<LayerAnimator>,
public LayerThreadedAnimationDelegate,
NON_EXPORTED_BASE(public cc::AnimationDelegate) {
enum PreemptionStrategy {
explicit LayerAnimator(base::TimeDelta transition_duration);
// No implicit animations when properties are set.
static LayerAnimator* CreateDefaultAnimator();
// Implicitly animates when properties are set.
static LayerAnimator* CreateImplicitAnimator();
// Sets the transform on the delegate. May cause an implicit animation.
virtual void SetTransform(const gfx::Transform& transform);
gfx::Transform GetTargetTransform() const;
// Sets the bounds on the delegate. May cause an implicit animation.
virtual void SetBounds(const gfx::Rect& bounds);
gfx::Rect GetTargetBounds() const;
// Sets the opacity on the delegate. May cause an implicit animation.
virtual void SetOpacity(float opacity);
float GetTargetOpacity() const;
// Sets the visibility of the delegate. May cause an implicit animation.
virtual void SetVisibility(bool visibility);
bool GetTargetVisibility() const;
// Sets the brightness on the delegate. May cause an implicit animation.
virtual void SetBrightness(float brightness);
float GetTargetBrightness() const;
// Sets the grayscale on the delegate. May cause an implicit animation.
virtual void SetGrayscale(float grayscale);
float GetTargetGrayscale() const;
// Sets the color on the delegate. May cause an implicit animation.
virtual void SetColor(SkColor color);
SkColor GetTargetColor() const;
// Returns the default length of animations, including adjustment for slow
// animation mode if set.
base::TimeDelta GetTransitionDuration() const;
// Sets the layer animation delegate the animator is associated with. The
// animator does not own the delegate. The layer animator expects a non-NULL
// delegate for most of its operations, so do not call any methods without
// a valid delegate installed.
void SetDelegate(LayerAnimationDelegate* delegate);
// Unsubscribe from |cc_layer_| and subscribe to |new_layer|.
void SwitchToLayer(scoped_refptr<cc::Layer> new_layer);
// Attach AnimationPlayer to Layer and AnimationTimeline
void AttachLayerAndTimeline(Compositor* compositor);
// Detach AnimationPlayer from Layer and AnimationTimeline
void DetachLayerAndTimeline(Compositor* compositor);
cc::AnimationPlayer* GetAnimationPlayerForTesting() const;
// Sets the animation preemption strategy. This determines the behaviour if
// a property is set during an animation. The default is
// IMMEDIATELY_SET_NEW_TARGET (see ImmediatelySetNewTarget below).
void set_preemption_strategy(PreemptionStrategy strategy) {
preemption_strategy_ = strategy;
PreemptionStrategy preemption_strategy() const {
return preemption_strategy_;
// Start an animation sequence. If an animation for the same property is in
// progress, it needs to be interrupted with the new animation. The animator
// takes ownership of this animation sequence.
void StartAnimation(LayerAnimationSequence* animation);
// Schedule an animation to be run when possible. The animator takes ownership
// of this animation sequence.
void ScheduleAnimation(LayerAnimationSequence* animation);
// Starts the animations to be run together, ensuring that the first elements
// in these sequences have the same effective start time even when some of
// them start on the compositor thread (but there is no such guarantee for
// the effective start time of subsequent elements). Obviously will not work
// if they animate any common properties. The animator takes ownership of the
// animation sequences. Takes PreemptionStrategy into account.
void StartTogether(const std::vector<LayerAnimationSequence*>& animations);
// Schedules the animations to be run together, ensuring that the first
// elements in these sequences have the same effective start time even when
// some of them start on the compositor thread (but there is no such guarantee
// for the effective start time of subsequent elements). Obviously will not
// work if they animate any common properties. The animator takes ownership
// of the animation sequences.
void ScheduleTogether(const std::vector<LayerAnimationSequence*>& animations);
// Schedules a pause for length |duration| of all the specified properties.
// End the list with -1.
void SchedulePauseForProperties(
base::TimeDelta duration,
LayerAnimationElement::AnimatableProperties properties_to_pause);
// Returns true if there is an animation in the queue (animations remain in
// the queue until they complete, so this includes running animations).
bool is_animating() const { return !animation_queue_.empty(); }
// Returns true if there is an animation in the queue that animates the given
// property (animations remain in the queue until they complete, so this
// includes running animations).
bool IsAnimatingProperty(
LayerAnimationElement::AnimatableProperty property) const;
// Stops animating the given property. No effect if there is no running
// animation for the given property. Skips to the final state of the
// animation.
void StopAnimatingProperty(
LayerAnimationElement::AnimatableProperty property);
// Stops all animation and clears any queued animations. This call progresses
// animations to their end points and notifies all observers.
void StopAnimating() { StopAnimatingInternal(false); }
// This is similar to StopAnimating, but aborts rather than finishes the
// animations and notifies all observers.
void AbortAllAnimations() { StopAnimatingInternal(true); }
// These functions are used for adding or removing observers from the observer
// list. The observers are notified when animations end.
void AddObserver(LayerAnimationObserver* observer);
void RemoveObserver(LayerAnimationObserver* observer);
// Called when a threaded animation is actually started.
void OnThreadedAnimationStarted(base::TimeTicks monotonic_time,
cc::TargetProperty::Type target_property,
int group_id);
// This determines how implicit animations will be tweened. This has no
// effect on animations that are explicitly started or scheduled. The default
// is Tween::LINEAR.
void set_tween_type(gfx::Tween::Type tween_type) { tween_type_ = tween_type; }
gfx::Tween::Type tween_type() const { return tween_type_; }
// For testing purposes only.
void set_disable_timer_for_test(bool disable_timer) {
disable_timer_for_test_ = disable_timer;
void set_last_step_time(base::TimeTicks time) {
last_step_time_ = time;
base::TimeTicks last_step_time() const { return last_step_time_; }
void Step(base::TimeTicks time_now);
void AddToCollection(LayerAnimatorCollection* collection);
void RemoveFromCollection(LayerAnimatorCollection* collection);
~LayerAnimator() override;
LayerAnimationDelegate* delegate() { return delegate_; }
const LayerAnimationDelegate* delegate() const { return delegate_; }
// Virtual for testing.
virtual void ProgressAnimation(LayerAnimationSequence* sequence,
base::TimeTicks now);
void ProgressAnimationToEnd(LayerAnimationSequence* sequence);
// Returns true if the sequence is owned by this animator.
bool HasAnimation(LayerAnimationSequence* sequence) const;
friend class base::RefCounted<LayerAnimator>;
friend class ScopedLayerAnimationSettings;
friend class LayerAnimatorTestController;
FRIEND_TEST_ALL_PREFIXES(LayerAnimatorTest, AnimatorStartedCorrectly);
class RunningAnimation {
RunningAnimation(const base::WeakPtr<LayerAnimationSequence>& sequence);
RunningAnimation(const RunningAnimation& other);
bool is_sequence_alive() const { return !!sequence_.get(); }
LayerAnimationSequence* sequence() const { return sequence_.get(); }
base::WeakPtr<LayerAnimationSequence> sequence_;
// Copy and assign are allowed.
typedef std::vector<RunningAnimation> RunningAnimations;
typedef std::deque<linked_ptr<LayerAnimationSequence> > AnimationQueue;
// Finishes all animations by either advancing them to their final state or by
// aborting them.
void StopAnimatingInternal(bool abort);
// Starts or stops stepping depending on whether thare are running animations.
void UpdateAnimationState();
// Removes the sequences from both the running animations and the queue.
// Returns a pointer to the removed animation, if any. NOTE: the caller is
// responsible for deleting the returned pointer.
LayerAnimationSequence* RemoveAnimation(
LayerAnimationSequence* sequence) WARN_UNUSED_RESULT;
// Progresses to the end of the sequence before removing it.
void FinishAnimation(LayerAnimationSequence* sequence, bool abort);
// Finishes any running animation with zero duration.
void FinishAnyAnimationWithZeroDuration();
// Clears the running animations and the queue. No sequences are progressed.
void ClearAnimations();
// Returns the running animation animating the given property, if any.
RunningAnimation* GetRunningAnimation(
LayerAnimationElement::AnimatableProperty property);
// Checks if the sequence has already been added to the queue and adds it
// to the front if note.
void AddToQueueIfNotPresent(LayerAnimationSequence* sequence);
// Any running or queued animation that affects a property in common with
// |sequence| is either finished or aborted depending on |abort|.
void RemoveAllAnimationsWithACommonProperty(LayerAnimationSequence* sequence,
bool abort);
// Preempts a running animation by progressing both the running animation and
// the given sequence to the end.
void ImmediatelySetNewTarget(LayerAnimationSequence* sequence);
// Preempts by aborting the running animation, and starts the given animation.
void ImmediatelyAnimateToNewTarget(LayerAnimationSequence* sequence);
// Preempts by adding the new animation to the queue.
void EnqueueNewAnimation(LayerAnimationSequence* sequence);
// Preempts by wiping out any unstarted animation in the queue and then
// enqueuing this animation.
void ReplaceQueuedAnimations(LayerAnimationSequence* sequence);
// If there's an animation in the queue that doesn't animate the same property
// as a running animation, or an animation schedule to run before it, start it
// up. Repeat until there are no such animations.
void ProcessQueue();
// Attempts to add the sequence to the list of running animations. Returns
// false if there is an animation running that already animates one of the
// properties affected by |sequence|.
bool StartSequenceImmediately(LayerAnimationSequence* sequence);
// Sets the value of target as if all the running and queued animations were
// allowed to finish.
void GetTargetValue(LayerAnimationElement::TargetValue* target) const;
// Called whenever an animation is added to the animation queue. Either by
// starting the animation or adding to the queue.
void OnScheduled(LayerAnimationSequence* sequence);
// Sets |transition_duration_| unless |is_transition_duration_locked_| is set.
void SetTransitionDuration(base::TimeDelta duration);
// Clears the animation queues and notifies any running animations that they
// have been aborted.
void ClearAnimationsInternal();
// Cleans up any running animations that may have been deleted.
void PurgeDeletedAnimations();
LayerAnimatorCollection* GetLayerAnimatorCollection();
// cc::AnimationDelegate implementation.
void NotifyAnimationStarted(base::TimeTicks monotonic_time,
cc::TargetProperty::Type target_property,
int group_id) override;
void NotifyAnimationFinished(base::TimeTicks monotonic_time,
cc::TargetProperty::Type target_property,
int group_id) override {}
void NotifyAnimationAborted(base::TimeTicks monotonic_time,
cc::TargetProperty::Type target_property,
int group_id) override {}
void NotifyAnimationTakeover(
base::TimeTicks monotonic_time,
cc::TargetProperty::Type target_property,
double animation_start_time,
std::unique_ptr<cc::AnimationCurve> curve) override {}
// Implementation of LayerThreadedAnimationDelegate.
void AddThreadedAnimation(std::unique_ptr<cc::Animation> animation) override;
void RemoveThreadedAnimation(int animation_id) override;
void AttachLayerToAnimationPlayer(int layer_id);
void DetachLayerFromAnimationPlayer();
void set_animation_metrics_reporter(AnimationMetricsReporter* reporter) {
animation_metrics_reporter_ = reporter;
// This is the queue of animations to run.
AnimationQueue animation_queue_;
// The target of all layer animations.
LayerAnimationDelegate* delegate_;
// Plays CC animations.
scoped_refptr<cc::AnimationPlayer> animation_player_;
// The currently running animations.
RunningAnimations running_animations_;
// Determines how animations are replaced.
PreemptionStrategy preemption_strategy_;
// Whether the length of animations is locked. While it is locked
// SetTransitionDuration does not set |transition_duration_|.
bool is_transition_duration_locked_;
// The default length of animations.
base::TimeDelta transition_duration_;
// The default tween type for implicit transitions
gfx::Tween::Type tween_type_;
// Used for coordinating the starting of animations.
base::TimeTicks last_step_time_;
// True if we are being stepped by our container.
bool is_started_;
// This prevents the animator from automatically stepping through animations
// and allows for manual stepping.
bool disable_timer_for_test_;
// Prevents timer adjustments in case when we start multiple animations
// with preemption strategies that discard previous animations.
bool adding_animations_;
// Helper to output UMA performance metrics.
AnimationMetricsReporter* animation_metrics_reporter_;
// Observers are notified when layer animations end, are scheduled or are
// aborted.
base::ObserverList<LayerAnimationObserver> observers_;
} // namespace ui