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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 "base/containers/flat_set.h"
#include "cc/cc_export.h"
#include "cc/input/scrollbar.h"
#include "cc/layers/layer.h"
#include "cc/layers/layer_impl.h"
#include "cc/trees/layer_tree_settings.h"
namespace cc {
class LayerTreeImpl;
class CC_EXPORT ScrollbarLayerImplBase : public LayerImpl {
ScrollbarLayerImplBase(const ScrollbarLayerImplBase&) = delete;
ScrollbarLayerImplBase& operator=(const ScrollbarLayerImplBase&) = delete;
ElementId scroll_element_id() const { return scroll_element_id_; }
void SetScrollElementId(ElementId scroll_element_id);
// The following setters should be called when updating scrollbar geometries
// (see: LayerTreeImpl::UpdateScrollbarGeometries).
bool SetCurrentPos(float current_pos);
void SetClipLayerLength(float clip_layer_length);
void SetScrollLayerLength(float scroll_layer_length);
void SetVerticalAdjust(float vertical_adjust);
float current_pos() const;
float clip_layer_length() const;
float scroll_layer_length() const;
float vertical_adjust() const;
bool is_overlay_scrollbar() const { return is_overlay_scrollbar_; }
void set_is_overlay_scrollbar(bool is_overlay) {
is_overlay_scrollbar_ = is_overlay;
ScrollbarOrientation orientation() const { return orientation_; }
bool is_left_side_vertical_scrollbar() {
return is_left_side_vertical_scrollbar_;
bool CanScrollOrientation() const;
void PushPropertiesTo(LayerImpl* layer) override;
ScrollbarLayerImplBase* ToScrollbarLayer() override;
// Thumb quad rect in layer space.
gfx::Rect ComputeThumbQuadRect() const;
gfx::Rect ComputeExpandedThumbQuadRect() const;
float thumb_thickness_scale_factor() {
return thumb_thickness_scale_factor_;
void SetThumbThicknessScaleFactor(float thumb_thickness_scale_factor);
virtual int ThumbThickness() const = 0;
void SetOverlayScrollbarLayerOpacityAnimated(float opacity);
virtual LayerTreeSettings::ScrollbarAnimator GetScrollbarAnimator() const;
virtual float TrackLength() const = 0;
virtual int ThumbLength() const = 0;
virtual gfx::Rect BackButtonRect() const;
virtual gfx::Rect ForwardButtonRect() const;
virtual gfx::Rect BackTrackRect() const;
virtual gfx::Rect ForwardTrackRect() const;
virtual bool SupportsDragSnapBack() const;
virtual ScrollbarPart IdentifyScrollbarPart(
const gfx::PointF position_in_widget) const;
// Only PaintedOverlayScrollbar(Aura Overlay Scrollbar) need to know
// tickmarks's state.
virtual bool HasFindInPageTickmarks() const;
// Mac overlay scrollbars are faded during paint but the compositor layer is
// always fully opaque where as Aura scrollbars fade by animating the layer
// opacity. This method will return the user visible opacity of an overlay
// scrollbar regardless of the underlying mechanism or platform.
virtual float OverlayScrollbarOpacity() const;
ScrollbarLayerImplBase(LayerTreeImpl* tree_impl,
int id,
ScrollbarOrientation orientation,
bool is_left_side_vertical_scrollbar,
bool is_overlay);
~ScrollbarLayerImplBase() override;
virtual int TrackStart() const = 0;
// Indicates whether the thumb length can be changed without going back to the
// main thread.
virtual bool IsThumbResizable() const = 0;
gfx::Rect ComputeThumbQuadRectWithThumbThicknessScale(
float thumb_thickness_scale_factor) const;
ElementId scroll_element_id_;
bool is_overlay_scrollbar_;
float thumb_thickness_scale_factor_;
float current_pos_;
float clip_layer_length_;
float scroll_layer_length_;
ScrollbarOrientation orientation_;
bool is_left_side_vertical_scrollbar_;
// Difference between the clip layer's height and the visible viewport
// height (which may differ in the presence of top-controls hiding).
float vertical_adjust_;
using ScrollbarSet = base::flat_set<ScrollbarLayerImplBase*>;
} // namespace cc