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 "base/compiler_specific.h"
  10 #include "ui/compositor/compositor_export.h"
  11
  12 namespace ui {
  13
  14 class Layer;
  15
  16 // Scoping object that owns a Layer and all its descendants.
  17 class COMPOSITOR_EXPORT LayerTreeOwner {
  18  public:
  19   explicit LayerTreeOwner(Layer* root);
  20   ~LayerTreeOwner();
  21
  22   Layer* release() WARN_UNUSED_RESULT {
  23     Layer* root = root_;
  24     root_ = NULL;
  25     return root;
  26   }
  27
  28   Layer* root() { return root_; }
  29   const Layer* root() const { return root_; }
  30
  31  private:
  32   Layer* root_;
  33
  34   DISALLOW_COPY_AND_ASSIGN(LayerTreeOwner);
  35 };
  36
  37 }  // namespace
  38
  39 #endif  // UI_COMPOSITOR_LAYER_TREE_OWNER_H_