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// Copyright 2015 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_MUS_SHADOW_H_
#define ASH_MUS_SHADOW_H_
#include <memory>
#include "base/macros.h"
#include "ui/aura/window_observer.h"
#include "ui/compositor/layer_animation_observer.h"
#include "ui/gfx/geometry/rect.h"
namespace ui {
class Layer;
} // namespace ui
namespace ash {
namespace mus {
// Simple class that draws a drop shadow around content at given bounds.
// http://crbug.com/670840.
class Shadow : public ui::ImplicitAnimationObserver,
public aura::WindowObserver {
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();
~Shadow() override;
void Init(Style style);
static Shadow* Get(aura::Window* window);
// Returns the interio inset for the specified style. The interior inset
// is the amount of padding added to each side of the content bounds that the
// shadow renders into. In other words the shadow extends from all sides of
// the layer by this value.
static int GetInteriorInsetForStyle(Style style);
// Returns |layer_.get()|. 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 { return layer_.get(); }
const gfx::Rect& content_bounds() const { return content_bounds_; }
Style style() const { return style_; }
// Moves and resizes the shadow layer to frame |content_bounds|.
void SetContentBounds(const gfx::Rect& content_bounds);
// Sets the shadow's style, animating opacity as necessary.
void SetStyle(Style style);
// Installs this shadow for |window|.
void Install(aura::Window* window);
// ui::ImplicitAnimationObserver overrides:
void OnImplicitAnimationsCompleted() override;
private:
// Updates the shadow images to the current |style_|.
void UpdateImagesForStyle();
// Updates the shadow layer bounds based on the inteior inset and the current
// |content_bounds_|.
void UpdateLayerBounds();
// WindowObserver:
void OnWindowDestroyed(aura::Window* window) override;
// The current style, set when the transition animation starts.
Style style_;
// The parent layer of the shadow layer. It serves as a container accessible
// from the outside to control the visibility of the shadow.
std::unique_ptr<ui::Layer> layer_;
// The actual shadow layer corresponding to a cc::NinePatchLayer.
std::unique_ptr<ui::Layer> shadow_layer_;
// Size of the current shadow image.
gfx::Size image_size_;
// Bounds of the content that the shadow encloses.
gfx::Rect content_bounds_;
// The interior inset of the shadow images. The content bounds of the image
// grid should be set to |content_bounds_| inset by this amount.
int interior_inset_;
aura::Window* window_;
DISALLOW_COPY_AND_ASSIGN(Shadow);
};
} // namespace mus
} // namespace ash
#endif // ASH_MUS_SHADOW_H_