Ref count layer animation controllers.

cc/animation_registrar.h

+// Copyright 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.
+
+#ifndef CC_ANIMATION_REGISTRAR_H_
+#define CC_ANIMATION_REGISTRAR_H_
+
+#include "base/hash_tables.h"
+#include "base/memory/ref_counted.h"
+#include "base/memory/scoped_ptr.h"
+#include "cc/cc_export.h"
+
+namespace cc {
+
+class LayerAnimationController;
+
+class CC_EXPORT AnimationRegistrar {
+ public:
+  typedef base::hash_map<int, LayerAnimationController*> AnimationControllerMap;
+
+  static scoped_ptr<AnimationRegistrar> create() {
+    return make_scoped_ptr(new AnimationRegistrar());
+  }
+
+  virtual ~AnimationRegistrar();
+
+  // If an animation has been registered for the given id, return it. Otherwise
+  // creates a new one and returns a scoped_refptr to it.
+  scoped_refptr<LayerAnimationController> GetAnimationControllerForId(int id);
+
+  // Registers the given animation controller as active. An active animation
+  // controller is one that has a running animation that needs to be ticked.
+  void DidActivateAnimationController(LayerAnimationController*);
+
+  // Unregisters the given animation controller. When this happens, the
+  // animation controller will no longer be ticked (since it's not active). It
+  // is not an error to call this function with a deactivated controller.
+  void DidDeactivateAnimationController(LayerAnimationController*);
+
+  // Registers the given controller as alive.
+  void RegisterAnimationController(LayerAnimationController*);
+
+  // Unregisters the given controller as alive.
+  void UnregisterAnimationController(LayerAnimationController*);
+
+  const AnimationControllerMap& active_animation_controllers() const {
+    return active_animation_controllers_;
+  }
+
+  const AnimationControllerMap& all_animation_controllers() const {
+    return all_animation_controllers_;
+  }
+
+ private:
+  AnimationRegistrar();
+
+  AnimationControllerMap active_animation_controllers_;
+  AnimationControllerMap all_animation_controllers_;
+
+  DISALLOW_COPY_AND_ASSIGN(AnimationRegistrar);
+};
+
+}  // namespace cc
+
+#endif  // CC_ANIMATION_REGISTRAR_H_