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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 {
const float kIdleThicknessScale = 0.4f;
const float kIdleOpacity = 0.7f;
const float kDefaultMouseMoveDistanceToTriggerAnimation = 25.f;
const int kDefaultAnimationDelay = 500;
const int kDefaultAnimationDuration = 300;
}
namespace cc {
scoped_ptr<ScrollbarAnimationControllerThinning>
ScrollbarAnimationControllerThinning::Create(LayerImpl* scroll_layer) {
return make_scoped_ptr(new ScrollbarAnimationControllerThinning(
scroll_layer,
base::TimeDelta::FromMilliseconds(kDefaultAnimationDelay),
base::TimeDelta::FromMilliseconds(kDefaultAnimationDuration)));
}
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),
mouse_is_over_scrollbar_(false),
mouse_is_near_scrollbar_(false),
thickness_change_(NONE),
opacity_change_(NONE),
should_delay_animation_(false),
animation_delay_(animation_delay),
animation_duration_(animation_duration),
mouse_move_distance_to_trigger_animation_(
kDefaultMouseMoveDistanceToTriggerAnimation) {
ApplyOpacityAndThumbThicknessScale(kIdleOpacity, kIdleThicknessScale);
}
ScrollbarAnimationControllerThinning::~ScrollbarAnimationControllerThinning() {
}
bool ScrollbarAnimationControllerThinning::IsAnimating() const {
return !last_awaken_time_.is_null();
}
base::TimeDelta ScrollbarAnimationControllerThinning::DelayBeforeStart(
base::TimeTicks now) const {
if (!should_delay_animation_)
return base::TimeDelta();
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) {
opacity_change_ = NONE;
thickness_change_ = NONE;
last_awaken_time_ = base::TimeTicks();
}
return IsAnimating() && DelayBeforeStart(now) == base::TimeDelta();
}
void ScrollbarAnimationControllerThinning::DidScrollGestureBegin() {
}
void ScrollbarAnimationControllerThinning::DidScrollGestureEnd(
base::TimeTicks now) {
}
void ScrollbarAnimationControllerThinning::DidMouseMoveOffScrollbar(
base::TimeTicks now) {
mouse_is_over_scrollbar_ = false;
mouse_is_near_scrollbar_ = false;
last_awaken_time_ = now;
should_delay_animation_ = false;
opacity_change_ = DECREASE;
thickness_change_ = DECREASE;
}
bool ScrollbarAnimationControllerThinning::DidScrollUpdate(
base::TimeTicks now) {
ApplyOpacityAndThumbThicknessScale(
1, mouse_is_near_scrollbar_ ? 1.f : kIdleThicknessScale);
last_awaken_time_ = now;
should_delay_animation_ = true;
if (!mouse_is_over_scrollbar_)
opacity_change_ = DECREASE;
return true;
}
bool ScrollbarAnimationControllerThinning::DidMouseMoveNear(
base::TimeTicks now, float distance) {
bool mouse_is_over_scrollbar = distance == 0.0;
bool mouse_is_near_scrollbar =
distance < mouse_move_distance_to_trigger_animation_;
if (mouse_is_over_scrollbar == mouse_is_over_scrollbar_ &&
mouse_is_near_scrollbar == mouse_is_near_scrollbar_)
return false;
if (mouse_is_over_scrollbar_ != mouse_is_over_scrollbar) {
mouse_is_over_scrollbar_ = mouse_is_over_scrollbar;
opacity_change_ = mouse_is_over_scrollbar_ ? INCREASE : DECREASE;
}
if (mouse_is_near_scrollbar_ != mouse_is_near_scrollbar) {
mouse_is_near_scrollbar_ = mouse_is_near_scrollbar;
thickness_change_ = mouse_is_near_scrollbar_ ? INCREASE : DECREASE;
}
last_awaken_time_ = now;
should_delay_animation_ = false;
return true;
}
float ScrollbarAnimationControllerThinning::AnimationProgressAtTime(
base::TimeTicks now) {
if (last_awaken_time_.is_null())
return 1;
base::TimeDelta delta = now - last_awaken_time_;
if (should_delay_animation_)
delta -= animation_delay_;
float progress = delta.InSecondsF() / animation_duration_.InSecondsF();
return std::max(std::min(progress, 1.f), 0.f);
}
float ScrollbarAnimationControllerThinning::OpacityAtAnimationProgress(
float progress) {
if (opacity_change_ == NONE)
return mouse_is_over_scrollbar_ ? 1.f : kIdleOpacity;
float factor = opacity_change_ == INCREASE ? progress : (1.f - progress);
float ret = ((1.f - kIdleOpacity) * factor) + kIdleOpacity;
return ret;
}
float
ScrollbarAnimationControllerThinning::ThumbThicknessScaleAtAnimationProgress(
float progress) {
if (thickness_change_ == NONE)
return mouse_is_near_scrollbar_ ? 1.f : kIdleThicknessScale;
float factor = thickness_change_ == INCREASE ? progress : (1.f - progress);
return ((1.f - kIdleThicknessScale) * factor) + kIdleThicknessScale;
}
float ScrollbarAnimationControllerThinning::AdjustScale(
float new_value,
float current_value,
AnimationChange animation_change) {
if (animation_change == INCREASE && current_value > new_value)
return current_value;
if (animation_change == DECREASE && current_value < new_value)
return current_value;
return new_value;
}
void ScrollbarAnimationControllerThinning::ApplyOpacityAndThumbThicknessScale(
float opacity, float thumb_thickness_scale) {
ScrollbarLayerImplBase* horizontal_scrollbar =
scroll_layer_->horizontal_scrollbar_layer();
if (horizontal_scrollbar) {
horizontal_scrollbar->SetOpacity(
AdjustScale(opacity, horizontal_scrollbar->opacity(), opacity_change_));
horizontal_scrollbar->SetThumbThicknessScaleFactor(
AdjustScale(
thumb_thickness_scale,
horizontal_scrollbar->thumb_thickness_scale_factor(),
thickness_change_));
}
ScrollbarLayerImplBase* vertical_scrollbar =
scroll_layer_->vertical_scrollbar_layer();
if (vertical_scrollbar) {
vertical_scrollbar->SetOpacity(
AdjustScale(opacity, vertical_scrollbar->opacity(), opacity_change_));
vertical_scrollbar->SetThumbThicknessScaleFactor(
AdjustScale(
thumb_thickness_scale,
vertical_scrollbar->thumb_thickness_scale_factor(),
thickness_change_));
}
}
} // namespace cc
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