Upstream version 7.36.149.0
[platform/framework/web/crosswalk.git] / src / ui / compositor / layer_tree_owner.h
1 // Copyright 2014 The Chromium Authors. All rights reserved.
2 // Use of this source code is governed by a BSD-style license that can be
3 // found in the LICENSE file.
4
5 #ifndef UI_COMPOSITOR_LAYER_TREE_OWNER_H_
6 #define UI_COMPOSITOR_LAYER_TREE_OWNER_H_
7
8 #include "base/basictypes.h"
9 #include "ui/compositor/compositor_export.h"
10
11 namespace ui {
12
13 class Layer;
14
15 // Scoping object that owns a Layer and all its descendants.
16 class COMPOSITOR_EXPORT LayerTreeOwner {
17  public:
18   explicit LayerTreeOwner(Layer* root);
19   ~LayerTreeOwner();
20
21   Layer* release() WARN_UNUSED_RESULT {
22     Layer* root = root_;
23     root_ = NULL;
24     return root;
25   }
26
27   Layer* root() { return root_; }
28   const Layer* root() const { return root_; }
29
30  private:
31   Layer* root_;
32
33   DISALLOW_COPY_AND_ASSIGN(LayerTreeOwner);
34 };
35
36 }  // namespace
37
38 #endif  // UI_COMPOSITOR_LAYER_TREE_OWNER_H_