Index: mojo/services/view_manager/animation_runner.h |
diff --git a/mojo/services/view_manager/animation_runner.h b/mojo/services/view_manager/animation_runner.h |
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+// 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. |
+ |
+#ifndef SERVICES_VIEW_MANAGER_ANIMATION_RUNNER_H_ |
+#define SERVICES_VIEW_MANAGER_ANIMATION_RUNNER_H_ |
+ |
+#include <algorithm> |
+#include <map> |
+#include <set> |
+#include <vector> |
+ |
+#include "base/containers/scoped_ptr_hash_map.h" |
+#include "base/observer_list.h" |
+#include "base/time/time.h" |
+ |
+namespace mojo { |
+class AnimationGroup; |
+} |
+ |
+namespace view_manager { |
+ |
+class AnimationRunnerObserver; |
+class ScheduledAnimationGroup; |
+class ServerView; |
+ |
+// AnimationRunner is responsible for maintaing and running a set of animations. |
+// The animations are represented as a set of AnimationGroups. New animations |
+// are scheduled by way of Schedule(). A |view| may only have one animation |
+// running at a time. Schedule()ing a new animation for a view already animating |
+// implicitly cancels the current animation for the view. Animations progress |
+// by way of the Tick() function. |
+class AnimationRunner { |
+ public: |
+ using AnimationId = uint32_t; |
+ using ViewAndAnimationPair = |
+ std::pair<ServerView*, const mojo::AnimationGroup*>; |
+ |
+ explicit AnimationRunner(base::TimeTicks now); |
+ ~AnimationRunner(); |
+ |
+ void AddObserver(AnimationRunnerObserver* observer); |
+ void RemoveObserver(AnimationRunnerObserver* observer); |
+ |
+ // Schedules animations. If any of the groups are not valid no animations are |
+ // scheuled and 0 is returned. If there is an existing animation in progress |
+ // for any of the views it is canceled and any properties that were animating |
+ // but are no longer animating are set to their target value. |
+ AnimationId Schedule(const std::vector<ViewAndAnimationPair>& views, |
+ base::TimeTicks now); |
+ |
+ // Cancels an animation scheduled by an id that was previously returned from |
+ // Schedule(). |
+ void CancelAnimation(AnimationId id); |
+ |
+ // Cancels the animation scheduled for |view|. Does nothing if there is no |
+ // animation scheduled for |view|. This does not change |view|. That is, any |
+ // in progress animations are stopped. |
+ void CancelAnimationForView(ServerView* view); |
+ |
+ // Advance the animations updating values appropriately. |
+ void Tick(base::TimeTicks time); |
+ |
+ // Returns true if there are animations currently scheduled. |
+ bool HasAnimations() const { return !view_to_animation_map_.empty(); } |
+ |
+ // Returns true if the animation identified by |id| is valid and animating. |
+ bool IsAnimating(AnimationId id) const { |
+ return id_to_views_map_.count(id) > 0; |
+ } |
+ |
+ // Returns the views that are currently animating for |id|. Returns an empty |
+ // set if |id| does not identify a valid animation. |
+ std::set<ServerView*> GetViewsAnimating(AnimationId id) { |
+ return IsAnimating(id) ? id_to_views_map_.find(id)->second |
+ : std::set<ServerView*>(); |
+ } |
+ |
+ private: |
+ enum CancelSource { |
+ // Cancel is the result of scheduling another animation for the view. |
+ CANCEL_SOURCE_SCHEDULE, |
+ |
+ // Cancel originates from an explicit call to cancel. |
+ CANCEL_SOURCE_CANCEL, |
+ }; |
+ |
+ using ViewToAnimationMap = |
+ base::ScopedPtrHashMap<ServerView*, ScheduledAnimationGroup>; |
+ using IdToViewsMap = std::map<AnimationId, std::set<ServerView*>>; |
+ |
+ void CancelAnimationForViewImpl(ServerView* view, CancelSource source); |
+ |
+ // Removes |view| from both |view_to_animation_map_| and |id_to_views_map_|. |
+ // Returns true if there are no more views animating with the animation id |
+ // the view is associated with. |
+ bool RemoveViewFromMaps(ServerView* view); |
+ |
+ AnimationId next_id_; |
+ |
+ base::TimeTicks last_tick_time_; |
+ |
+ ObserverList<AnimationRunnerObserver> observers_; |
+ |
+ ViewToAnimationMap view_to_animation_map_; |
+ |
+ IdToViewsMap id_to_views_map_; |
+ |
+ DISALLOW_COPY_AND_ASSIGN(AnimationRunner); |
+}; |
+ |
+} // namespace view_manager |
+ |
+#endif // SERVICES_VIEW_MANAGER_ANIMATION_RUNNER_H_ |