layer_owner.cc revision 116680a4aac90f2aa7413d9095a592090648e557
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 24scoped_ptr<Layer> LayerOwner::AcquireLayer() { 25 if (layer_owner_) 26 layer_owner_->owner_ = NULL; 27 return layer_owner_.Pass(); 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->GetTargetVisibility()); 42 new_layer->SetOpacity(old_layer->GetTargetOpacity()); 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 new_layer->SetSubpixelPositionOffset(old_layer->subpixel_position_offset()); 49 50 // Install new layer as a sibling of the old layer, stacked below it. 51 if (old_layer->parent()) { 52 old_layer->parent()->Add(new_layer); 53 old_layer->parent()->StackBelow(new_layer, old_layer.get()); 54 } 55 56 // Migrate all the child layers over to the new layer. Copy the list because 57 // the items are removed during iteration. 58 std::vector<ui::Layer*> children_copy = old_layer->children(); 59 for (std::vector<ui::Layer*>::const_iterator it = children_copy.begin(); 60 it != children_copy.end(); 61 ++it) { 62 ui::Layer* child = *it; 63 new_layer->Add(child); 64 } 65 66 // Install the delegate last so that the delegate isn't notified as we copy 67 // state to the new layer. 68 new_layer->set_delegate(old_delegate); 69 70 if (layer_owner_delegate_) 71 layer_owner_delegate_->OnLayerRecreated(old_layer.get(), new_layer); 72 73 return old_layer.Pass(); 74} 75 76void LayerOwner::DestroyLayer() { 77 layer_ = NULL; 78 layer_owner_.reset(); 79} 80 81bool LayerOwner::OwnsLayer() const { 82 return !!layer_owner_; 83} 84 85} // namespace ui 86