| // Copyright (c) 2012 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. |
| |
| #include "ui/compositor/layer_owner.h" |
| |
| #include <utility> |
| |
| |
| namespace ui { |
| |
| LayerOwner::LayerOwner(std::unique_ptr<Layer> layer) { |
| if (layer) |
| SetLayer(std::move(layer)); |
| } |
| |
| LayerOwner::~LayerOwner() = default; |
| |
| void LayerOwner::SetLayer(std::unique_ptr<Layer> layer) { |
| DCHECK(!OwnsLayer()); |
| layer_owner_ = std::move(layer); |
| layer_ = layer_owner_.get(); |
| layer_->owner_ = this; |
| } |
| |
| std::unique_ptr<Layer> LayerOwner::AcquireLayer() { |
| if (layer_owner_) |
| layer_owner_->owner_ = NULL; |
| return std::move(layer_owner_); |
| } |
| |
| std::unique_ptr<Layer> LayerOwner::RecreateLayer() { |
| std::unique_ptr<ui::Layer> old_layer(AcquireLayer()); |
| if (!old_layer) |
| return old_layer; |
| |
| LayerDelegate* old_delegate = old_layer->delegate(); |
| old_layer->set_delegate(NULL); |
| |
| SetLayer(old_layer->Clone()); |
| |
| if (old_layer->parent()) { |
| // Install new layer as a sibling of the old layer, stacked below it. |
| old_layer->parent()->Add(layer_); |
| old_layer->parent()->StackBelow(layer_, old_layer.get()); |
| } else if (old_layer->GetCompositor()) { |
| // If old_layer was the layer tree root then we need to move the Compositor |
| // over to the new root. |
| old_layer->GetCompositor()->SetRootLayer(layer_); |
| } |
| |
| // Migrate all the child layers over to the new layer. Copy the list because |
| // the items are removed during iteration. |
| std::vector<ui::Layer*> children_copy = old_layer->children(); |
| for (std::vector<ui::Layer*>::const_iterator it = children_copy.begin(); |
| it != children_copy.end(); |
| ++it) { |
| ui::Layer* child = *it; |
| layer_->Add(child); |
| } |
| |
| // Install the delegate last so that the delegate isn't notified as we copy |
| // state to the new layer. |
| layer_->set_delegate(old_delegate); |
| |
| return old_layer; |
| } |
| |
| void LayerOwner::DestroyLayer() { |
| layer_ = NULL; |
| layer_owner_.reset(); |
| } |
| |
| bool LayerOwner::OwnsLayer() const { |
| return !!layer_owner_; |
| } |
| |
| } // namespace ui |