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// Copyright 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 CC_INPUT_SINGLE_SCROLLBAR_ANIMATION_CONTROLLER_THINNING_H_
#define CC_INPUT_SINGLE_SCROLLBAR_ANIMATION_CONTROLLER_THINNING_H_
#include <memory>
#include "base/macros.h"
#include "base/time/time.h"
#include "cc/base/cc_export.h"
#include "cc/input/scrollbar.h"
#include "cc/layers/layer_impl.h"
#include "cc/layers/scrollbar_layer_impl_base.h"
#include "ui/gfx/geometry/vector2d_f.h"
namespace cc {
class ScrollbarAnimationControllerClient;
// ScrollbarAnimationControllerThinning for one scrollbar
class CC_EXPORT SingleScrollbarAnimationControllerThinning {
public:
static constexpr float kIdleThicknessScale = 0.4f;
static constexpr float kDefaultMouseMoveDistanceToTriggerAnimation = 25.f;
static std::unique_ptr<SingleScrollbarAnimationControllerThinning> Create(
int scroll_layer_id,
ScrollbarOrientation orientation,
ScrollbarAnimationControllerClient* client,
base::TimeDelta thinning_duration);
~SingleScrollbarAnimationControllerThinning() {}
bool mouse_is_over_scrollbar() const { return mouse_is_over_scrollbar_; }
bool mouse_is_near_scrollbar() const { return mouse_is_near_scrollbar_; }
bool captured() const { return captured_; }
bool Animate(base::TimeTicks now);
void StartAnimation();
void StopAnimation();
void UpdateThumbThicknessScale();
void DidMouseDown();
void DidMouseUp();
void DidMouseLeave();
void DidMouseMoveNear(float distance);
private:
SingleScrollbarAnimationControllerThinning(
int scroll_layer_id,
ScrollbarOrientation orientation,
ScrollbarAnimationControllerClient* client,
base::TimeDelta thinning_duration);
float AnimationProgressAtTime(base::TimeTicks now);
void RunAnimationFrame(float progress);
const base::TimeDelta& Duration();
// Describes whether the current animation should INCREASE (thicken)
// a bar or DECREASE it (thin).
enum AnimationChange { NONE, INCREASE, DECREASE };
float ThumbThicknessScaleAt(float progress);
float AdjustScale(float new_value,
float current_value,
AnimationChange animation_change,
float min_value,
float max_value);
void ApplyThumbThicknessScale(float thumb_thickness_scale);
ScrollbarAnimationControllerClient* client_;
base::TimeTicks last_awaken_time_;
bool is_animating_;
int scroll_layer_id_;
ScrollbarOrientation orientation_;
bool captured_;
bool mouse_is_over_scrollbar_;
bool mouse_is_near_scrollbar_;
// Are we narrowing or thickening the bars.
AnimationChange thickness_change_;
base::TimeDelta thinning_duration_;
DISALLOW_COPY_AND_ASSIGN(SingleScrollbarAnimationControllerThinning);
};
} // namespace cc
#endif // CC_INPUT_SINGLE_SCROLLBAR_ANIMATION_CONTROLLER_THINNING_H_