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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_ANIMATION_SCROLLBAR_ANIMATION_CONTROLLER_THINNING_H_
#define CC_ANIMATION_SCROLLBAR_ANIMATION_CONTROLLER_THINNING_H_
#include "base/memory/scoped_ptr.h"
#include "cc/animation/scrollbar_animation_controller.h"
#include "cc/base/cc_export.h"
namespace cc {
class LayerImpl;
// Scrollbar animation that partially fades and thins after an idle delay,
// and reacts to mouse movements.
class CC_EXPORT ScrollbarAnimationControllerThinning
: public ScrollbarAnimationController {
public:
static scoped_ptr<ScrollbarAnimationControllerThinning> Create(
LayerImpl* scroll_layer,
ScrollbarAnimationControllerClient* client,
base::TimeDelta delay_before_starting,
base::TimeDelta duration);
virtual ~ScrollbarAnimationControllerThinning();
void set_mouse_move_distance_for_test(float distance) {
mouse_move_distance_to_trigger_animation_ = distance;
}
bool mouse_is_over_scrollbar() const { return mouse_is_over_scrollbar_; }
bool mouse_is_near_scrollbar() const { return mouse_is_near_scrollbar_; }
virtual void DidScrollUpdate() OVERRIDE;
virtual void DidMouseMoveOffScrollbar() OVERRIDE;
virtual void DidMouseMoveNear(float distance) OVERRIDE;
protected:
ScrollbarAnimationControllerThinning(
LayerImpl* scroll_layer,
ScrollbarAnimationControllerClient* client,
base::TimeDelta delay_before_starting,
base::TimeDelta duration);
virtual void RunAnimationFrame(float progress) OVERRIDE;
private:
// Describes whether the current animation should INCREASE (darken / thicken)
// a bar or DECREASE it (lighten / thin).
enum AnimationChange {
NONE,
INCREASE,
DECREASE
};
float OpacityAtAnimationProgress(float progress);
float ThumbThicknessScaleAtAnimationProgress(float progress);
float AdjustScale(float new_value,
float current_value,
AnimationChange animation_change);
void ApplyOpacityAndThumbThicknessScale(float opacity,
float thumb_thickness_scale);
LayerImpl* scroll_layer_;
bool mouse_is_over_scrollbar_;
bool mouse_is_near_scrollbar_;
// Are we narrowing or thickening the bars.
AnimationChange thickness_change_;
// Are we darkening or lightening the bars.
AnimationChange opacity_change_;
// How close should the mouse be to the scrollbar before we thicken it.
float mouse_move_distance_to_trigger_animation_;
DISALLOW_COPY_AND_ASSIGN(ScrollbarAnimationControllerThinning);
};
} // namespace cc
#endif // CC_ANIMATION_SCROLLBAR_ANIMATION_CONTROLLER_THINNING_H_
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