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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.
#ifndef UI_COMPOSITOR_LAYER_OWNER_H_
#define UI_COMPOSITOR_LAYER_OWNER_H_
#include "base/compiler_specific.h"
#include "base/macros.h"
#include "base/memory/scoped_ptr.h"
#include "ui/compositor/compositor_export.h"
#include "ui/compositor/layer.h"
namespace ui {
class LayerOwnerDelegate;
class COMPOSITOR_EXPORT LayerOwner {
public:
LayerOwner();
virtual ~LayerOwner();
void SetLayer(Layer* layer);
// Releases the owning reference to its layer, and returns it.
// This is used when you need to animate the presentation of the owner just
// prior to destroying it. The Owner can be destroyed soon after calling this
// function, and the caller is then responsible for disposing of the layer
// once any animation completes. Note that layer() will remain valid until the
// end of ~LayerOwner().
scoped_ptr<Layer> AcquireLayer();
// Asks the owner to recreate the layer, returning the old Layer. NULL is
// returned if there is no existing layer, or recreate is not supported.
//
// This does not recurse. Existing children of the layer are moved to the new
// layer.
virtual scoped_ptr<Layer> RecreateLayer();
ui::Layer* layer() { return layer_; }
const ui::Layer* layer() const { return layer_; }
void set_layer_owner_delegate(LayerOwnerDelegate* delegate) {
layer_owner_delegate_ = delegate;
}
protected:
void DestroyLayer();
bool OwnsLayer() const;
private:
// The LayerOwner owns its layer unless ownership is relinquished via a call
// to AcquireLayer(). After that moment |layer_| will still be valid but
// |layer_owner_| will be NULL. The reason for releasing ownership is that
// the client may wish to animate the layer beyond the lifetime of the owner,
// e.g. fading it out when it is destroyed.
scoped_ptr<Layer> layer_owner_;
Layer* layer_;
LayerOwnerDelegate* layer_owner_delegate_;
DISALLOW_COPY_AND_ASSIGN(LayerOwner);
};
} // namespace ui
#endif // UI_COMPOSITOR_LAYER_OWNER_H_
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