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// 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() : layer_(NULL) {}
LayerOwner::~LayerOwner() {
}
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
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