CC Animations: Establish AnimationHost, AnimationTimeline and AnimationPlayer

cc/animation/element_animations.cc

+// Copyright 2015 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 "cc/animation/element_animations.h"
+
+#include "cc/animation/animation_host.h"
+#include "cc/animation/animation_player.h"
+#include "cc/animation/animation_registrar.h"
+#include "cc/animation/layer_animation_value_observer.h"
+#include "cc/trees/mutator_host_client.h"
+
+namespace cc {
+
+class ElementAnimations::ValueObserver : public LayerAnimationValueObserver {
+ public:
+  ValueObserver(ElementAnimations* element_animation, LayerTreeType tree_type)
+      : element_animation_(element_animation), tree_type_(tree_type) {
+    DCHECK(element_animation_);
+  }
+
+  // LayerAnimationValueObserver implementation.
+  void OnFilterAnimated(const FilterOperations& filters) override {
+    element_animation_->SetFilterMutated(tree_type_, filters);
+  }
+
+  void OnOpacityAnimated(float opacity) override {
+    element_animation_->SetOpacityMutated(tree_type_, opacity);
+  }
+
+  void OnTransformAnimated(const gfx::Transform& transform) override {
+    element_animation_->SetTransformMutated(tree_type_, transform);
+  }
+
+  void OnScrollOffsetAnimated(const gfx::ScrollOffset& scroll_offset) override {
+    element_animation_->SetScrollOffsetMutated(tree_type_, scroll_offset);
+  }
+
+  void OnAnimationWaitingForDeletion() override {
+    // TODO(loyso): implement it.
+  }
+
+  bool IsActive() const override { return tree_type_ == LayerTreeType::ACTIVE; }
+
+ private:
+  ElementAnimations* element_animation_;
+  const LayerTreeType tree_type_;
+
+  DISALLOW_COPY_AND_ASSIGN(ValueObserver);
+};
+
+ElementAnimations::ElementAnimations(AnimationHost* host)
+    : players_list_(make_scoped_ptr(new PlayersList())), animation_host_(host) {
+  DCHECK(animation_host_);
+}
+
+ElementAnimations::~ElementAnimations() {
+  DCHECK(!layer_animation_controller_);
+}
+
+void ElementAnimations::CreateLayerAnimationController(int layer_id) {
+  DCHECK(layer_id);
+  DCHECK(!layer_animation_controller_);
+  DCHECK(animation_host_);
+
+  AnimationRegistrar* registrar = animation_host_->animation_registrar();
+  DCHECK(registrar);
+
+  layer_animation_controller_ =
+      registrar->GetAnimationControllerForId(layer_id);
+  layer_animation_controller_->SetAnimationRegistrar(registrar);
+  layer_animation_controller_->set_layer_animation_delegate(this);
+  layer_animation_controller_->set_value_provider(this);
+
+  DCHECK(animation_host_->mutator_host_client());
+  if (animation_host_->mutator_host_client()->IsLayerInTree(
+          layer_id, LayerTreeType::ACTIVE))
+    CreateActiveValueObserver();
+  if (animation_host_->mutator_host_client()->IsLayerInTree(
+          layer_id, LayerTreeType::PENDING))
+    CreatePendingValueObserver();
+}
+
+void ElementAnimations::DestroyLayerAnimationController() {
+  DCHECK(animation_host_);
+
+  DestroyPendingValueObserver();
+  DestroyActiveValueObserver();
+
+  if (layer_animation_controller_) {
+    layer_animation_controller_->remove_value_provider(this);
+    layer_animation_controller_->remove_layer_animation_delegate(this);
+    layer_animation_controller_->SetAnimationRegistrar(nullptr);
+    layer_animation_controller_ = nullptr;
+  }
+}
+
+void ElementAnimations::LayerRegistered(int layer_id, LayerTreeType tree_type) {
+  DCHECK(layer_animation_controller_);
+  DCHECK_EQ(layer_animation_controller_->id(), layer_id);
+
+  if (tree_type == LayerTreeType::ACTIVE) {
+    if (!active_value_observer_)
+      CreateActiveValueObserver();
+  } else {
+    if (!pending_value_observer_)
+      CreatePendingValueObserver();
+  }
+}
+
+void ElementAnimations::LayerUnregistered(int layer_id,
+                                          LayerTreeType tree_type) {
+  DCHECK_EQ(this->layer_id(), layer_id);
+  tree_type == LayerTreeType::ACTIVE ? DestroyActiveValueObserver()
+                                     : DestroyPendingValueObserver();
+}
+
+void ElementAnimations::AddPlayer(AnimationPlayer* player) {
+  players_list_->Append(player);
+}
+
+void ElementAnimations::RemovePlayer(AnimationPlayer* player) {
+  for (PlayersListNode* node = players_list_->head();
+       node != players_list_->end(); node = node->next()) {
+    if (node->value() == player) {
+      node->RemoveFromList();
+      return;
+    }
+  }
+}
+
+bool ElementAnimations::IsEmpty() const {
+  return players_list_->empty();
+}
+
+void ElementAnimations::PushPropertiesTo(
+    ElementAnimations* element_animations_impl) {
+  DCHECK(layer_animation_controller_);
+  DCHECK(element_animations_impl->layer_animation_controller());
+
+  layer_animation_controller_->PushAnimationUpdatesTo(
+      element_animations_impl->layer_animation_controller());
+}
+
+void ElementAnimations::SetFilterMutated(LayerTreeType tree_type,
+                                         const FilterOperations& filters) {
+  DCHECK(layer_id());
+  DCHECK(animation_host());
+  DCHECK(animation_host()->mutator_host_client());
+  animation_host()->mutator_host_client()->SetLayerFilterMutated(
+      layer_id(), tree_type, filters);
+}
+
+void ElementAnimations::SetOpacityMutated(LayerTreeType tree_type,
+                                          float opacity) {
+  DCHECK(layer_id());
+  DCHECK(animation_host());
+  DCHECK(animation_host()->mutator_host_client());
+  animation_host()->mutator_host_client()->SetLayerOpacityMutated(
+      layer_id(), tree_type, opacity);
+}
+
+void ElementAnimations::SetTransformMutated(LayerTreeType tree_type,
+                                            const gfx::Transform& transform) {
+  DCHECK(layer_id());
+  DCHECK(animation_host());
+  DCHECK(animation_host()->mutator_host_client());
+  animation_host()->mutator_host_client()->SetLayerTransformMutated(
+      layer_id(), tree_type, transform);
+}
+
+void ElementAnimations::SetScrollOffsetMutated(
+    LayerTreeType tree_type,
+    const gfx::ScrollOffset& scroll_offset) {
+  DCHECK(layer_id());
+  DCHECK(animation_host());
+  DCHECK(animation_host()->mutator_host_client());
+  animation_host()->mutator_host_client()->SetLayerScrollOffsetMutated(
+      layer_id(), tree_type, scroll_offset);
+}
+
+void ElementAnimations::CreateActiveValueObserver() {
+  DCHECK(layer_animation_controller_);
+  DCHECK(!active_value_observer_);
+  active_value_observer_ =
+      make_scoped_ptr(new ValueObserver(this, LayerTreeType::ACTIVE));
+  layer_animation_controller_->AddValueObserver(active_value_observer_.get());
+}
+
+void ElementAnimations::DestroyActiveValueObserver() {
+  if (layer_animation_controller_ && active_value_observer_)
+    layer_animation_controller_->RemoveValueObserver(
+        active_value_observer_.get());
+  active_value_observer_ = nullptr;
+}
+
+void ElementAnimations::CreatePendingValueObserver() {
+  DCHECK(layer_animation_controller_);
+  DCHECK(!pending_value_observer_);
+  pending_value_observer_ =
+      make_scoped_ptr(new ValueObserver(this, LayerTreeType::PENDING));
+  layer_animation_controller_->AddValueObserver(pending_value_observer_.get());
+}
+
+void ElementAnimations::DestroyPendingValueObserver() {
+  if (layer_animation_controller_ && pending_value_observer_)
+    layer_animation_controller_->RemoveValueObserver(
+        pending_value_observer_.get());
+  pending_value_observer_ = nullptr;
+}
+
+void ElementAnimations::NotifyAnimationStarted(
+    base::TimeTicks monotonic_time,
+    Animation::TargetProperty target_property,
+    int group) {
+  for (PlayersListNode* node = players_list_->head();
+       node != players_list_->end(); node = node->next()) {
+    AnimationPlayer* player = node->value();
+    player->NotifyAnimationStarted(monotonic_time, target_property, group);
+  }
+}
+
+void ElementAnimations::NotifyAnimationFinished(
+    base::TimeTicks monotonic_time,
+    Animation::TargetProperty target_property,
+    int group) {
+  for (PlayersListNode* node = players_list_->head();
+       node != players_list_->end(); node = node->next()) {
+    AnimationPlayer* player = node->value();
+    player->NotifyAnimationFinished(monotonic_time, target_property, group);
+  }
+}
+
+gfx::ScrollOffset ElementAnimations::ScrollOffsetForAnimation() const {
+  // TODO(loyso): implement it.
+  return gfx::ScrollOffset();
+}
+
+}  // namespace cc