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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.
#include "cc/animation/scrollbar_animation_controller_thinning.h"
#include <algorithm>
#include "base/time/time.h"
#include "cc/layers/layer_impl.h"
#include "cc/layers/scrollbar_layer_impl_base.h"
namespace cc {
scoped_ptr<ScrollbarAnimationControllerThinning>
ScrollbarAnimationControllerThinning::Create(LayerImpl* scroll_layer) {
return make_scoped_ptr(new ScrollbarAnimationControllerThinning(
scroll_layer,
base::TimeDelta::FromMilliseconds(500),
base::TimeDelta::FromMilliseconds(300)));
}
scoped_ptr<ScrollbarAnimationControllerThinning>
ScrollbarAnimationControllerThinning::CreateForTest(LayerImpl* scroll_layer,
base::TimeDelta animation_delay, base::TimeDelta animation_duration) {
return make_scoped_ptr(new ScrollbarAnimationControllerThinning(
scroll_layer, animation_delay, animation_duration));
}
ScrollbarAnimationControllerThinning::ScrollbarAnimationControllerThinning(
LayerImpl* scroll_layer,
base::TimeDelta animation_delay,
base::TimeDelta animation_duration)
: ScrollbarAnimationController(),
scroll_layer_(scroll_layer),
scroll_gesture_in_progress_(false),
animation_delay_(animation_delay),
animation_duration_(animation_duration) {}
ScrollbarAnimationControllerThinning::~ScrollbarAnimationControllerThinning() {
}
bool ScrollbarAnimationControllerThinning::IsAnimating() const {
return !last_awaken_time_.is_null();
}
base::TimeDelta ScrollbarAnimationControllerThinning::DelayBeforeStart(
base::TimeTicks now) const {
if (now > last_awaken_time_ + animation_delay_)
return base::TimeDelta();
return animation_delay_ - (now - last_awaken_time_);
}
bool ScrollbarAnimationControllerThinning::Animate(base::TimeTicks now) {
float progress = AnimationProgressAtTime(now);
float opacity = OpacityAtAnimationProgress(progress);
float thumb_thickness_scale = ThumbThicknessScaleAtAnimationProgress(
progress);
ApplyOpacityAndThumbThicknessScale(opacity, thumb_thickness_scale);
if (progress == 1.f)
last_awaken_time_ = base::TimeTicks();
return IsAnimating() && DelayBeforeStart(now) == base::TimeDelta();
}
void ScrollbarAnimationControllerThinning::DidScrollGestureBegin() {
ApplyOpacityAndThumbThicknessScale(1, 1);
last_awaken_time_ = base::TimeTicks();
scroll_gesture_in_progress_ = true;
}
void ScrollbarAnimationControllerThinning::DidScrollGestureEnd(
base::TimeTicks now) {
last_awaken_time_ = now;
scroll_gesture_in_progress_ = false;
}
bool ScrollbarAnimationControllerThinning::DidScrollUpdate(
base::TimeTicks now) {
ApplyOpacityAndThumbThicknessScale(1, 1);
last_awaken_time_ = now;
return true;
}
float ScrollbarAnimationControllerThinning::AnimationProgressAtTime(
base::TimeTicks now) {
if (scroll_gesture_in_progress_)
return 0;
if (last_awaken_time_.is_null())
return 1;
base::TimeDelta delta = now - last_awaken_time_;
float progress = (delta - animation_delay_).InSecondsF() /
animation_duration_.InSecondsF();
return std::max(std::min(progress, 1.f), 0.f);
}
float ScrollbarAnimationControllerThinning::OpacityAtAnimationProgress(
float progress) {
const float kIdleOpacity = 0.7f;
return ((1 - kIdleOpacity) * (1.f - progress)) + kIdleOpacity;
}
float
ScrollbarAnimationControllerThinning::ThumbThicknessScaleAtAnimationProgress(
float progress) {
const float kIdleThicknessScale = 0.4f;
return ((1 - kIdleThicknessScale) * (1.f - progress)) + kIdleThicknessScale;
}
void ScrollbarAnimationControllerThinning::ApplyOpacityAndThumbThicknessScale(
float opacity, float thumb_thickness_scale) {
ScrollbarLayerImplBase* horizontal_scrollbar =
scroll_layer_->horizontal_scrollbar_layer();
if (horizontal_scrollbar) {
horizontal_scrollbar->SetOpacity(opacity);
horizontal_scrollbar->set_thumb_thickness_scale_factor(
thumb_thickness_scale);
}
ScrollbarLayerImplBase* vertical_scrollbar =
scroll_layer_->vertical_scrollbar_layer();
if (vertical_scrollbar) {
vertical_scrollbar->SetOpacity(opacity);
vertical_scrollbar->set_thumb_thickness_scale_factor(thumb_thickness_scale);
}
}
} // namespace cc
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