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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 "ui/compositor/layer_owner_delegate.h"
namespace ui {
LayerOwner::LayerOwner() : layer_(NULL), layer_owner_delegate_(NULL) {
}
LayerOwner::~LayerOwner() {
}
void LayerOwner::SetLayer(Layer* layer) {
DCHECK(!OwnsLayer());
layer_owner_.reset(layer);
layer_ = layer;
layer_->owner_ = this;
}
scoped_ptr<Layer> LayerOwner::AcquireLayer() {
if (layer_owner_)
layer_owner_->owner_ = NULL;
return layer_owner_.Pass();
}
scoped_ptr<Layer> LayerOwner::RecreateLayer() {
scoped_ptr<ui::Layer> old_layer(AcquireLayer());
if (!old_layer)
return old_layer.Pass();
LayerDelegate* old_delegate = old_layer->delegate();
old_layer->set_delegate(NULL);
const gfx::Rect layer_bounds(old_layer->bounds());
Layer* new_layer = new ui::Layer(old_layer->type());
SetLayer(new_layer);
new_layer->SetVisible(old_layer->GetTargetVisibility());
new_layer->SetOpacity(old_layer->GetTargetOpacity());
new_layer->SetBounds(layer_bounds);
new_layer->SetMasksToBounds(old_layer->GetMasksToBounds());
new_layer->set_name(old_layer->name());
new_layer->SetFillsBoundsOpaquely(old_layer->fills_bounds_opaquely());
new_layer->SetFillsBoundsCompletely(old_layer->FillsBoundsCompletely());
new_layer->SetSubpixelPositionOffset(old_layer->subpixel_position_offset());
SkRegion* alpha_shape = old_layer->alpha_shape();
if (alpha_shape)
new_layer->SetAlphaShape(make_scoped_ptr(new SkRegion(*alpha_shape)));
// Install new layer as a sibling of the old layer, stacked below it.
if (old_layer->parent()) {
old_layer->parent()->Add(new_layer);
old_layer->parent()->StackBelow(new_layer, old_layer.get());
}
// 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;
new_layer->Add(child);
}
// If old_layer was the layer tree root then we need to move the Compositor
// over to the new root.
const bool is_root = !old_layer->parent();
if (is_root && old_layer->GetCompositor())
old_layer->GetCompositor()->SetRootLayer(new_layer);
// Install the delegate last so that the delegate isn't notified as we copy
// state to the new layer.
new_layer->set_delegate(old_delegate);
if (layer_owner_delegate_)
layer_owner_delegate_->OnLayerRecreated(old_layer.get(), new_layer);
return old_layer.Pass();
}
void LayerOwner::DestroyLayer() {
layer_ = NULL;
layer_owner_.reset();
}
bool LayerOwner::OwnsLayer() const {
return !!layer_owner_;
}
} // namespace ui
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