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_