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// Copyright 2014 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 ASH_HOST_TRANSFORMER_HELPER_H_
#define ASH_HOST_TRANSFORMER_HELPER_H_
#include "base/macros.h"
#include "base/memory/scoped_ptr.h"
namespace gfx {
class Insets;
class Size;
class Transform;
}
namespace ash {
class AshWindowTreeHost;
class RootWindowTransformer;
// A helper class to handle ash specific feature that requires
// transforming a root window (such as rotation, UI zooming).
class TransformerHelper {
public:
explicit TransformerHelper(AshWindowTreeHost* ash_host);
~TransformerHelper();
// Initializes the transformer with identity transform.
void Init();
// Returns the the insets that specifies the effective root window
// area within the host window.
gfx::Insets GetHostInsets() const;
// Sets a simple transform with no host insets.
void SetTransform(const gfx::Transform& transform);
// Sets a RootWindowTransformer which takes the insets into account.
void SetRootWindowTransformer(scoped_ptr<RootWindowTransformer> transformer);
// Returns the transforms applied to the root window.
gfx::Transform GetTransform() const;
gfx::Transform GetInverseTransform() const;
// Updates the root window size based on the host size and
// current transform.
void UpdateWindowSize(const gfx::Size& host_size);
private:
AshWindowTreeHost* ash_host_;
scoped_ptr<RootWindowTransformer> transformer_;
DISALLOW_COPY_AND_ASSIGN(TransformerHelper);
};
} // namespace ash
#endif // ASH_HOST_TRANSFORMER_HELPER_H_