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// Copyright 2013 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 CHROME_BROWSER_CHROMEOS_UI_FOCUS_RING_LAYER_H_
#define CHROME_BROWSER_CHROMEOS_UI_FOCUS_RING_LAYER_H_
#include "base/basictypes.h"
#include "base/memory/scoped_ptr.h"
#include "ui/compositor/layer_delegate.h"
#include "ui/gfx/rect.h"
namespace aura {
class Window;
}
namespace ui {
class Layer;
}
namespace chromeos {
// A delegate interface implemented by the object that owns a FocusRingLayer.
class FocusRingLayerDelegate {
public:
virtual void OnDeviceScaleFactorChanged() = 0;
protected:
virtual ~FocusRingLayerDelegate();
};
// FocusRingLayer draws a focus ring at a given global rectangle.
class FocusRingLayer : public ui::LayerDelegate {
public:
explicit FocusRingLayer(FocusRingLayerDelegate* delegate);
virtual ~FocusRingLayer();
// Move the focus ring layer to the given bounds in the coordinates of
// the given root window.
void Set(aura::Window* root_window, const gfx::Rect& bounds);
ui::Layer* layer() { return layer_.get(); }
aura::Window* root_window() { return root_window_; }
protected:
// Updates |root_window_| and creates |layer_| if it doesn't exist,
// or if the root window has changed. Moves the layer to the top if
// it wasn't there already.
void CreateOrUpdateLayer(aura::Window* root_window, const char* layer_name);
private:
// ui::LayerDelegate overrides:
virtual void OnPaintLayer(gfx::Canvas* canvas) override;
virtual void OnDelegatedFrameDamage(
const gfx::Rect& damage_rect_in_dip) override;
virtual void OnDeviceScaleFactorChanged(float device_scale_factor) override;
virtual base::Closure PrepareForLayerBoundsChange() override;
// The object that owns this layer.
FocusRingLayerDelegate* delegate_;
// The current root window containing the focused object.
aura::Window* root_window_;
// The current layer.
scoped_ptr<ui::Layer> layer_;
// The bounding rectangle of the focused object, in |root_window_|
// coordinates.
gfx::Rect focus_ring_;
DISALLOW_COPY_AND_ASSIGN(FocusRingLayer);
};
} // namespace chromeos
#endif // CHROME_BROWSER_CHROMEOS_UI_FOCUS_RING_LAYER_H_
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