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mojo/services/view_manager/animation_runner.cc

Index: mojo/services/view_manager/animation_runner.cc
diff --git a/mojo/services/view_manager/animation_runner.cc b/mojo/services/view_manager/animation_runner.cc
new file mode 100644
index 0000000000000000000000000000000000000000..dc910a112e9a37917848c269b0850d89e8605a71
--- /dev/null
+++ b/mojo/services/view_manager/animation_runner.cc
@@ -0,0 +1,157 @@
+// Copyright 2014 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 "mojo/services/view_manager/animation_runner.h"
+
+#include "base/memory/scoped_vector.h"
+#include "mojo/services/view_manager/animation_runner_observer.h"
+#include "mojo/services/view_manager/scheduled_animation_group.h"
+#include "mojo/services/view_manager/server_view.h"
+
+namespace view_manager {
+namespace {
+
+bool ConvertViewAndAnimationPairToScheduledAnimationGroup(
+    const std::vector<AnimationRunner::ViewAndAnimationPair>& views,
+    AnimationRunner::AnimationId id,
+    base::TimeTicks now,
+    ScopedVector<ScheduledAnimationGroup>* groups) {
+  for (const auto& view_animation_pair : views) {
+    DCHECK(view_animation_pair.second);
+    scoped_ptr<ScheduledAnimationGroup> group(ScheduledAnimationGroup::Create(
+        view_animation_pair.first, now, id, *(view_animation_pair.second)));
+    if (!group.get())
+      return false;
+    groups->push_back(group.release());
+  }
+  return true;
+}
+
+}  // namespace
+
+AnimationRunner::AnimationRunner(base::TimeTicks now)
+    : next_id_(1), last_tick_time_(now) {
+}
+
+AnimationRunner::~AnimationRunner() {
+}
+
+void AnimationRunner::AddObserver(AnimationRunnerObserver* observer) {
+  observers_.AddObserver(observer);
+}
+
+void AnimationRunner::RemoveObserver(AnimationRunnerObserver* observer) {
+  observers_.RemoveObserver(observer);
+}
+
+AnimationRunner::AnimationId AnimationRunner::Schedule(
+    const std::vector<ViewAndAnimationPair>& views,
+    base::TimeTicks now) {
+  DCHECK_GE(now, last_tick_time_);
+
+  const AnimationId animation_id = next_id_++;
+  ScopedVector<ScheduledAnimationGroup> groups;
+  if (!ConvertViewAndAnimationPairToScheduledAnimationGroup(views, animation_id,
+                                                            now, &groups)) {
+    return 0;
+  }
+
+  // Cancel any animations for the views.
+  for (auto* group : groups) {
+    ScheduledAnimationGroup* current_group =
+        view_to_animation_map_.get(group->view());
+    if (current_group)
+      current_group->SetValuesToTargetValuesForPropertiesNotIn(*group);
+
+    CancelAnimationForViewImpl(group->view(), CANCEL_SOURCE_SCHEDULE);
+  }
+
+  for (auto* group : groups) {
+    group->ObtainStartValues();
+    view_to_animation_map_.set(group->view(), make_scoped_ptr(group));
+    DCHECK(!id_to_views_map_[animation_id].count(group->view()));
+    id_to_views_map_[animation_id].insert(group->view());
+  }
+  // |view_to_animation_map_| owns the groups.
+  groups.weak_clear();
+
+  FOR_EACH_OBSERVER(AnimationRunnerObserver, observers_,
+                    OnAnimationScheduled(animation_id));
+  return animation_id;
+}
+
+void AnimationRunner::CancelAnimation(AnimationId id) {
+  if (id_to_views_map_.count(id) == 0)
+    return;
+
+  std::set<ServerView*> views(id_to_views_map_[id]);
+  for (ServerView* view : views)
+    CancelAnimationForView(view);
+}
+
+void AnimationRunner::CancelAnimationForView(ServerView* view) {
+  CancelAnimationForViewImpl(view, CANCEL_SOURCE_CANCEL);
+}
+
+void AnimationRunner::Tick(base::TimeTicks time) {
+  DCHECK(time >= last_tick_time_);
+  last_tick_time_ = time;
+  if (view_to_animation_map_.empty())
+    return;
+
+  // The animation ids of any views whose animation completes are added here. We
+  // notify after processing all views so that if an observer mutates us in some
+  // way we're aren't left in a weird state.
+  std::set<AnimationId> animations_completed;
+  for (ViewToAnimationMap::iterator i = view_to_animation_map_.begin();
+       i != view_to_animation_map_.end();) {
+    if (i->second->Tick(time)) {
+      const AnimationId animation_id = i->second->id();
+      ServerView* view = i->first;
+      ++i;
+      if (RemoveViewFromMaps(view))
+        animations_completed.insert(animation_id);
+    } else {
+      ++i;
+    }
+  }
+  for (const AnimationId& id : animations_completed) {
+    FOR_EACH_OBSERVER(AnimationRunnerObserver, observers_, OnAnimationDone(id));
+  }
+}
+
+void AnimationRunner::CancelAnimationForViewImpl(ServerView* view,
+                                                 CancelSource source) {
+  if (!view_to_animation_map_.contains(view))
+    return;
+
+  const AnimationId animation_id = view_to_animation_map_.get(view)->id();
+  if (RemoveViewFromMaps(view)) {
+    // This was the last view in the group.
+    if (source == CANCEL_SOURCE_CANCEL) {
+      FOR_EACH_OBSERVER(AnimationRunnerObserver, observers_,
+                        OnAnimationCanceled(animation_id));
+    } else {
+      FOR_EACH_OBSERVER(AnimationRunnerObserver, observers_,
+                        OnAnimationInterrupted(animation_id));
+    }
+  }
+}
+
+bool AnimationRunner::RemoveViewFromMaps(ServerView* view) {
+  DCHECK(view_to_animation_map_.contains(view));
+
+  const AnimationId animation_id = view_to_animation_map_.get(view)->id();
+  view_to_animation_map_.erase(view);
+
+  DCHECK(id_to_views_map_.count(animation_id));
+  id_to_views_map_[animation_id].erase(view);
+  if (!id_to_views_map_[animation_id].empty())
+    return false;
+
+  id_to_views_map_.erase(animation_id);
+  return true;
+}
+
+}  // namespace view_manager