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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 CONTENT_BROWSER_ANDROID_EDGE_EFFECT_BASE_H_
#define CONTENT_BROWSER_ANDROID_EDGE_EFFECT_BASE_H_
#include "base/basictypes.h"
#include "base/time/time.h"
#include "ui/gfx/geometry/size_f.h"
#include "ui/gfx/transform.h"
namespace cc {
class Layer;
}
namespace content {
// A base class for overscroll-related Android effects.
class EdgeEffectBase {
public:
enum State {
STATE_IDLE = 0,
STATE_PULL,
STATE_ABSORB,
STATE_RECEDE,
STATE_PULL_DECAY
};
virtual ~EdgeEffectBase() {}
virtual void Pull(base::TimeTicks current_time,
float delta_distance,
float displacement) = 0;
virtual void Absorb(base::TimeTicks current_time, float velocity) = 0;
virtual bool Update(base::TimeTicks current_time) = 0;
virtual void Release(base::TimeTicks current_time) = 0;
virtual void Finish() = 0;
virtual bool IsFinished() const = 0;
virtual void ApplyToLayers(const gfx::SizeF& size,
const gfx::Transform& transform) = 0;
virtual void SetParent(cc::Layer* parent) = 0;
};
} // namespace content
#endif // CONTENT_BROWSER_ANDROID_EDGE_EFFECT_BASE_H_
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