| // 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/layers/solid_color_scrollbar_layer.h" |
| |
| #include <memory> |
| |
| #include "cc/layers/layer_impl.h" |
| #include "cc/layers/solid_color_scrollbar_layer_impl.h" |
| |
| namespace cc { |
| |
| std::unique_ptr<LayerImpl> SolidColorScrollbarLayer::CreateLayerImpl( |
| LayerTreeImpl* tree_impl) { |
| return SolidColorScrollbarLayerImpl::Create( |
| tree_impl, id(), orientation(), thumb_thickness_, track_start_, |
| is_left_side_vertical_scrollbar()); |
| } |
| |
| scoped_refptr<SolidColorScrollbarLayer> SolidColorScrollbarLayer::CreateOrReuse( |
| scoped_refptr<Scrollbar> scrollbar, |
| SolidColorScrollbarLayer* existing_layer) { |
| DCHECK(scrollbar->IsOverlay()); |
| bool is_horizontal = |
| scrollbar->Orientation() == ScrollbarOrientation::HORIZONTAL; |
| gfx::Rect thumb_rect = scrollbar->ThumbRect(); |
| int thumb_thickness = |
| is_horizontal ? thumb_rect.height() : thumb_rect.width(); |
| gfx::Rect track_rect = scrollbar->TrackRect(); |
| int track_start = is_horizontal ? track_rect.x() : track_rect.y(); |
| |
| if (existing_layer && |
| // We don't support change of these fields in a layer. |
| existing_layer->thumb_thickness() == thumb_thickness && |
| existing_layer->track_start() == track_start) { |
| // These fields have been checked in ScrollbarLayerBase::CreateOrReuse(). |
| DCHECK_EQ(scrollbar->Orientation(), existing_layer->orientation()); |
| DCHECK_EQ(scrollbar->IsLeftSideVerticalScrollbar(), |
| existing_layer->is_left_side_vertical_scrollbar()); |
| return existing_layer; |
| } |
| |
| return Create(scrollbar->Orientation(), thumb_thickness, track_start, |
| scrollbar->IsLeftSideVerticalScrollbar()); |
| } |
| |
| scoped_refptr<SolidColorScrollbarLayer> SolidColorScrollbarLayer::Create( |
| ScrollbarOrientation orientation, |
| int thumb_thickness, |
| int track_start, |
| bool is_left_side_vertical_scrollbar) { |
| return base::WrapRefCounted( |
| new SolidColorScrollbarLayer(orientation, thumb_thickness, track_start, |
| is_left_side_vertical_scrollbar)); |
| } |
| |
| SolidColorScrollbarLayer::SolidColorScrollbarLayer( |
| ScrollbarOrientation orientation, |
| int thumb_thickness, |
| int track_start, |
| bool is_left_side_vertical_scrollbar) |
| : ScrollbarLayerBase(orientation, is_left_side_vertical_scrollbar), |
| thumb_thickness_(thumb_thickness), |
| track_start_(track_start) { |
| Layer::SetOpacity(0.f); |
| } |
| |
| SolidColorScrollbarLayer::~SolidColorScrollbarLayer() = default; |
| |
| void SolidColorScrollbarLayer::SetOpacity(float opacity) { |
| // The opacity of a solid color scrollbar layer is always 0 on main thread. |
| DCHECK_EQ(opacity, 0.f); |
| Layer::SetOpacity(opacity); |
| } |
| |
| void SolidColorScrollbarLayer::SetNeedsDisplayRect(const gfx::Rect& rect) { |
| // Never needs repaint. |
| } |
| |
| bool SolidColorScrollbarLayer::OpacityCanAnimateOnImplThread() const { |
| return true; |
| } |
| |
| bool SolidColorScrollbarLayer::HitTestable() const { |
| // Android scrollbars can't be interacted with by user input. They should |
| // avoid hit testing so we don't enter any scrollbar scrolling code paths. |
| return false; |
| } |
| |
| ScrollbarLayerBase::ScrollbarLayerType |
| SolidColorScrollbarLayer::GetScrollbarLayerType() const { |
| return kSolidColor; |
| } |
| |
| } // namespace cc |