blob: a449ffc64e70a21fbf4755e988b8e8e4edc18ce1 [file] [log] [blame]
// 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/cc_export.h"
#include "cc/input/scrollbar.h"
#include "cc/layers/layer.h"
#include "cc/layers/scrollbar_layer_base.h"
#include "cc/resources/scoped_ui_resource.h"
namespace cc {
// Generic scrollbar layer for cases not covered by PaintedOverlayScrollbarLayer
// or SolidColorScrollbarLayer. This is not used for CSS-styled scrollbars. In
// practice, this is used for overlay and non-overlay scrollbars on MacOS, as
// well as non-overlay scrollbars on Win/Linux.
class CC_EXPORT PaintedScrollbarLayer : public ScrollbarLayerBase {
std::unique_ptr<LayerImpl> CreateLayerImpl(LayerTreeImpl* tree_impl) override;
static scoped_refptr<PaintedScrollbarLayer> CreateOrReuse(
scoped_refptr<Scrollbar> scrollbar,
PaintedScrollbarLayer* existing_layer);
static scoped_refptr<PaintedScrollbarLayer> Create(
scoped_refptr<Scrollbar> scrollbar);
PaintedScrollbarLayer(const PaintedScrollbarLayer&) = delete;
PaintedScrollbarLayer& operator=(const PaintedScrollbarLayer&) = delete;
bool OpacityCanAnimateOnImplThread() const override;
bool Update() override;
void SetLayerTreeHost(LayerTreeHost* host) override;
void PushPropertiesTo(LayerImpl* layer) override;
const gfx::Size& internal_content_bounds() const {
return internal_content_bounds_;
ScrollbarLayerType GetScrollbarLayerType() const override;
explicit PaintedScrollbarLayer(scoped_refptr<Scrollbar> scrollbar);
~PaintedScrollbarLayer() override;
// For unit tests
UIResourceId track_resource_id() {
return track_resource_.get() ? track_resource_->id() : 0;
UIResourceId thumb_resource_id() {
return thumb_resource_.get() ? thumb_resource_->id() : 0;
bool UpdateInternalContentScale();
bool UpdateThumbAndTrackGeometry();
gfx::Size LayerSizeToContentSize(const gfx::Size& layer_size) const;
template <typename T>
bool UpdateProperty(T value, T* prop) {
if (*prop == value)
return false;
*prop = value;
return true;
UIResourceBitmap RasterizeScrollbarPart(
const gfx::Size& size,
const gfx::Size& requested_content_size,
ScrollbarPart part);
scoped_refptr<Scrollbar> scrollbar_;
ElementId scroll_element_id_;
float internal_contents_scale_;
gfx::Size internal_content_bounds_;
// Snapshot of properties taken in UpdateThumbAndTrackGeometry and used in
// PushPropertiesTo.
gfx::Size thumb_size_;
gfx::Rect track_rect_;
gfx::Rect back_button_rect_;
gfx::Rect forward_button_rect_;
float painted_opacity_;
bool has_thumb_;
bool jump_on_track_click_;
const bool supports_drag_snap_back_;
const bool is_overlay_;
std::unique_ptr<ScopedUIResource> track_resource_;
std::unique_ptr<ScopedUIResource> thumb_resource_;
} // namespace cc