| // 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 UI_COMPOSITOR_LAYER_TREE_OWNER_H_ |
| #define UI_COMPOSITOR_LAYER_TREE_OWNER_H_ |
| |
| #include <memory> |
| |
| #include "base/compiler_specific.h" |
| #include "base/macros.h" |
| #include "ui/compositor/compositor_export.h" |
| |
| namespace ui { |
| |
| class Layer; |
| |
| // Scoping object that owns a Layer and all its descendants. |
| class COMPOSITOR_EXPORT LayerTreeOwner { |
| public: |
| explicit LayerTreeOwner(std::unique_ptr<Layer> root); |
| ~LayerTreeOwner(); |
| |
| Layer* release() WARN_UNUSED_RESULT { |
| Layer* root = root_; |
| root_ = NULL; |
| return root; |
| } |
| |
| Layer* root() { return root_; } |
| const Layer* root() const { return root_; } |
| |
| private: |
| Layer* root_; |
| |
| DISALLOW_COPY_AND_ASSIGN(LayerTreeOwner); |
| }; |
| |
| } // namespace |
| |
| #endif // UI_COMPOSITOR_LAYER_TREE_OWNER_H_ |