| // 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 |