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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 ASH_WM_SHADOW_H_
#define ASH_WM_SHADOW_H_
#include "ash/ash_export.h"
#include "base/basictypes.h"
#include "base/memory/scoped_ptr.h"
#include "ui/compositor/layer_animation_observer.h"
#include "ui/gfx/rect.h"
namespace ui {
class Layer;
} // namespace ui
namespace ash {
namespace internal {
class ImageGrid;
// Simple class that draws a drop shadow around content at given bounds.
class ASH_EXPORT Shadow : public ui::ImplicitAnimationObserver {
public:
enum Style {
// Active windows have more opaque shadows, shifted down to make the window
// appear "higher".
STYLE_ACTIVE,
// Inactive windows have less opaque shadows.
STYLE_INACTIVE,
// Small windows like tooltips and context menus have lighter, smaller
// shadows.
STYLE_SMALL,
};
Shadow();
virtual ~Shadow();
void Init(Style style);
// Returns |image_grid_|'s ui::Layer. This is exposed so it can be added to
// the same layer as the content and stacked below it. SetContentBounds()
// should be used to adjust the shadow's size and position (rather than
// applying transformations to this layer).
ui::Layer* layer() const;
const gfx::Rect& content_bounds() const { return content_bounds_; }
Style style() const { return style_; }
// Moves and resizes |image_grid_| to frame |content_bounds|.
void SetContentBounds(const gfx::Rect& content_bounds);
// Sets the shadow's style, animating opacity as necessary.
void SetStyle(Style style);
// ui::ImplicitAnimationObserver overrides:
virtual void OnImplicitAnimationsCompleted() OVERRIDE;
private:
// Updates the |image_grid_| images to the current |style_|.
void UpdateImagesForStyle();
// Updates the |image_grid_| bounds based on its image sizes and the
// current |content_bounds_|.
void UpdateImageGridBounds();
// The current style, set when the transition animation starts.
Style style_;
scoped_ptr<ImageGrid> image_grid_;
// Bounds of the content that the shadow encloses.
gfx::Rect content_bounds_;
DISALLOW_COPY_AND_ASSIGN(Shadow);
};
} // namespace internal
} // namespace ash
#endif // ASH_WM_SHADOW_H_