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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 UI_ANDROID_EDGE_EFFECT_H_
#define UI_ANDROID_EDGE_EFFECT_H_
#include <memory>
#include "base/macros.h"
#include "base/memory/ref_counted.h"
#include "base/time/time.h"
#include "ui/android/ui_android_export.h"
#include "ui/gfx/geometry/rect_f.h"
#include "ui/gfx/geometry/size.h"
#include "ui/gfx/geometry/size_f.h"
#include "ui/gfx/transform.h"
namespace cc {
class Layer;
class UIResourceLayer;
}
namespace ui {
class ResourceManager;
}
namespace ui {
// A base class for overscroll-related Android effects.
class UI_ANDROID_EXPORT EdgeEffect {
public:
enum State {
STATE_IDLE = 0,
STATE_PULL,
STATE_ABSORB,
STATE_RECEDE,
STATE_PULL_DECAY
};
enum Edge { EDGE_TOP, EDGE_LEFT, EDGE_BOTTOM, EDGE_RIGHT, EDGE_COUNT };
explicit EdgeEffect(ui::ResourceManager* resource_manager);
~EdgeEffect();
void Pull(base::TimeTicks current_time,
float delta_distance,
float displacement);
void Absorb(base::TimeTicks current_time, float velocity);
bool Update(base::TimeTicks current_time);
void Release(base::TimeTicks current_time);
void Finish();
bool IsFinished() const;
float GetAlpha() const;
void ApplyToLayers(Edge edge, const gfx::SizeF& viewport_size, float offset);
void SetParent(cc::Layer* parent);
private:
ui::ResourceManager* const resource_manager_;
scoped_refptr<cc::UIResourceLayer> glow_;
float glow_alpha_;
float glow_scale_y_;
float glow_alpha_start_;
float glow_alpha_finish_;
float glow_scale_y_start_;
float glow_scale_y_finish_;
gfx::RectF arc_rect_;
gfx::Size bounds_;
float displacement_;
float target_displacement_;
base::TimeTicks start_time_;
base::TimeDelta duration_;
State state_;
float pull_distance_;
DISALLOW_COPY_AND_ASSIGN(EdgeEffect);
};
} // namespace ui
#endif // UI_ANDROID_EDGE_EFFECT_H_
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