android: move overscroll effects to ui/

content/browser/android/edge_effect_base.h

-// 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
-  };
-
-  enum Edge { EDGE_TOP, EDGE_LEFT, EDGE_BOTTOM, EDGE_RIGHT, EDGE_COUNT };
-
-  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 float GetAlpha() const = 0;
-
-  virtual void ApplyToLayers(Edge edge,
-                             const gfx::SizeF& viewport_size,
-                             float offset) = 0;
-  virtual void SetParent(cc::Layer* parent) = 0;
-
- protected:
-  // Computes the transform for an edge effect given the |edge|, |viewport_size|
-  // and edge |offset|. This assumes the the effect transform anchor is at the
-  // centered edge of the effect.
-  static gfx::Transform ComputeTransform(Edge edge,
-                                         const gfx::SizeF& viewport_size,
-                                         float offset);
-
-  // Computes the maximum effect size relative to the screen |edge|. For
-  // top/bottom edges, thsi is simply |viewport_size|, while for left/right
-  // edges this is |viewport_size| with coordinates swapped.
-  static gfx::SizeF ComputeOrientedSize(Edge edge,
-                                        const gfx::SizeF& viewport_size);
-};
-
-}  // namespace content
-
-#endif  // CONTENT_BROWSER_ANDROID_EDGE_EFFECT_BASE_H_