layer_owner.cc revision effb81e5f8246d0db0270817048dc992db66e9fb 
1// Copyright (c) 2012 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#include "ui/compositor/layer_owner.h"
6
7#include "ui/compositor/layer_owner_delegate.h"
8
9namespace ui {
10
11LayerOwner::LayerOwner() : layer_(NULL), layer_owner_delegate_(NULL) {
12}
13
14LayerOwner::~LayerOwner() {
15}
16
17void LayerOwner::SetLayer(Layer* layer) {
18  DCHECK(!OwnsLayer());
19  layer_owner_.reset(layer);
20  layer_ = layer;
21  layer_->owner_ = this;
22}
23
24Layer* LayerOwner::AcquireLayer() {
25  if (layer_owner_)
26    layer_owner_->owner_ = NULL;
27  return layer_owner_.release();
28}
29
30scoped_ptr<Layer> LayerOwner::RecreateLayer() {
31  scoped_ptr<ui::Layer> old_layer(AcquireLayer());
32  if (!old_layer)
33    return old_layer.Pass();
34
35  LayerDelegate* old_delegate = old_layer->delegate();
36  old_layer->set_delegate(NULL);
37
38  const gfx::Rect layer_bounds(old_layer->bounds());
39  Layer* new_layer = new ui::Layer(old_layer->type());
40  SetLayer(new_layer);
41  new_layer->SetVisible(old_layer->visible());
42  new_layer->set_scale_content(old_layer->scale_content());
43  new_layer->SetBounds(layer_bounds);
44  new_layer->SetMasksToBounds(old_layer->GetMasksToBounds());
45  new_layer->set_name(old_layer->name());
46  new_layer->SetFillsBoundsOpaquely(old_layer->fills_bounds_opaquely());
47  new_layer->SetFillsBoundsCompletely(old_layer->FillsBoundsCompletely());
48
49  // Install new layer as a sibling of the old layer, stacked below it.
50  if (old_layer->parent()) {
51    old_layer->parent()->Add(new_layer);
52    old_layer->parent()->StackBelow(new_layer, old_layer.get());
53  }
54
55  // Migrate all the child layers over to the new layer. Copy the list because
56  // the items are removed during iteration.
57  std::vector<ui::Layer*> children_copy = old_layer->children();
58  for (std::vector<ui::Layer*>::const_iterator it = children_copy.begin();
59       it != children_copy.end();
60       ++it) {
61    ui::Layer* child = *it;
62    new_layer->Add(child);
63  }
64
65  // Install the delegate last so that the delegate isn't notified as we copy
66  // state to the new layer.
67  new_layer->set_delegate(old_delegate);
68
69  if (layer_owner_delegate_)
70    layer_owner_delegate_->OnLayerRecreated(old_layer.get(), new_layer);
71
72  return old_layer.Pass();
73}
74
75void LayerOwner::DestroyLayer() {
76  layer_ = NULL;
77  layer_owner_.reset();
78}
79
80bool LayerOwner::OwnsLayer() const {
81  return !!layer_owner_;
82}
83
84}  // namespace ui
85