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// Copyright (c) 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 CONTENT_BROWSER_ANDROID_EDGE_EFFECT_H_
#define CONTENT_BROWSER_ANDROID_EDGE_EFFECT_H_
#include "base/basictypes.h"
#include "base/memory/ref_counted.h"
#include "base/time.h"
#include "ui/gfx/size_f.h"
namespace cc {
class Layer;
}
namespace content {
/* |EdgeEffect| mirrors its Android counterpart, EdgeEffect.java.
* The primary difference is ownership; the Android version manages render
* resources directly, while this version simply applies the effect to
* existing resources. Conscious tradeoffs were made to align this as closely
* as possible with the original Android java version.
*/
class EdgeEffect {
public:
enum Edge {
EDGE_TOP = 0,
EDGE_LEFT,
EDGE_BOTTOM,
EDGE_RIGHT,
EDGE_COUNT
};
EdgeEffect(scoped_refptr<cc::Layer> edge, scoped_refptr<cc::Layer> glow);
~EdgeEffect();
void Pull(base::TimeTicks current_time, float delta_distance);
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;
void ApplyToLayers(gfx::SizeF size, Edge edge);
private:
enum State {
STATE_IDLE = 0,
STATE_PULL,
STATE_ABSORB,
STATE_RECEDE,
STATE_PULL_DECAY
};
scoped_refptr<cc::Layer> edge_;
scoped_refptr<cc::Layer> glow_;
float edge_alpha_;
float edge_scale_y_;
float glow_alpha_;
float glow_scale_y_;
float edge_alpha_start_;
float edge_alpha_finish_;
float edge_scale_y_start_;
float edge_scale_y_finish_;
float glow_alpha_start_;
float glow_alpha_finish_;
float glow_scale_y_start_;
float glow_scale_y_finish_;
base::TimeTicks start_time_;
base::TimeDelta duration_;
State state_;
float pull_distance_;
float dpi_scale_;
DISALLOW_COPY_AND_ASSIGN(EdgeEffect);
};
} // namespace content
#endif // CONTENT_BROWSER_ANDROID_EDGE_EFFECT_H_
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