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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 "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;
}
namespace cc {
scoped_ptr<ScrollbarAnimationControllerThinning>
ScrollbarAnimationControllerThinning::Create(
LayerImpl* scroll_layer,
ScrollbarAnimationControllerClient* client,
base::TimeDelta delay_before_starting,
base::TimeDelta duration) {
return make_scoped_ptr(new ScrollbarAnimationControllerThinning(
scroll_layer, client, delay_before_starting, duration));
}
ScrollbarAnimationControllerThinning::ScrollbarAnimationControllerThinning(
LayerImpl* scroll_layer,
ScrollbarAnimationControllerClient* client,
base::TimeDelta delay_before_starting,
base::TimeDelta duration)
: ScrollbarAnimationController(client, delay_before_starting, duration),
scroll_layer_(scroll_layer),
mouse_is_over_scrollbar_(false),
mouse_is_near_scrollbar_(false),
thickness_change_(NONE),
opacity_change_(NONE),
mouse_move_distance_to_trigger_animation_(
kDefaultMouseMoveDistanceToTriggerAnimation) {
ApplyOpacityAndThumbThicknessScale(kIdleOpacity, kIdleThicknessScale);
}
ScrollbarAnimationControllerThinning::~ScrollbarAnimationControllerThinning() {
}
void ScrollbarAnimationControllerThinning::RunAnimationFrame(float progress) {
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;
StopAnimation();
}
}
void ScrollbarAnimationControllerThinning::DidMouseMoveOffScrollbar() {
mouse_is_over_scrollbar_ = false;
mouse_is_near_scrollbar_ = false;
opacity_change_ = DECREASE;
thickness_change_ = DECREASE;
StartAnimation();
}
void ScrollbarAnimationControllerThinning::DidScrollUpdate() {
ScrollbarAnimationController::DidScrollUpdate();
ApplyOpacityAndThumbThicknessScale(
1, mouse_is_near_scrollbar_ ? 1.f : kIdleThicknessScale);
if (!mouse_is_over_scrollbar_)
opacity_change_ = DECREASE;
}
void ScrollbarAnimationControllerThinning::DidMouseMoveNear(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;
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;
}
StartAnimation();
}
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) {
if (!scroll_layer_->scrollbars())
return;
LayerImpl::ScrollbarSet* scrollbars = scroll_layer_->scrollbars();
for (LayerImpl::ScrollbarSet::iterator it = scrollbars->begin();
it != scrollbars->end();
++it) {
ScrollbarLayerImplBase* scrollbar = *it;
if (scrollbar->is_overlay_scrollbar()) {
scrollbar->SetOpacity(
AdjustScale(opacity, scrollbar->opacity(), opacity_change_));
scrollbar->SetThumbThicknessScaleFactor(
AdjustScale(thumb_thickness_scale,
scrollbar->thumb_thickness_scale_factor(),
thickness_change_));
}
}
}
} // namespace cc
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