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// Copyright 2013 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CC_LAYERS_PAINTED_SCROLLBAR_LAYER_H_
#define CC_LAYERS_PAINTED_SCROLLBAR_LAYER_H_
#include <memory>
#include "base/functional/function_ref.h"
#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 NinPatchThumbScrollbarLayer
// or SolidColorScrollbarLayer. This is not used for legacy webkit custom
// scrollbars. In practice, this is used for
// - overlay and non-overlay scrollbars on MacOS,
// - non-overlay aura scrollbars on non-MacOS desktop platforms,
// - overlay and non-overlay fluent scrollbars on non-MacOS desktop platforms.
class CC_EXPORT PaintedScrollbarLayer : public ScrollbarLayerBase {
public:
std::unique_ptr<LayerImpl> CreateLayerImpl(
LayerTreeImpl* tree_impl) const 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;
const gfx::Size& internal_content_bounds() const {
return internal_content_bounds_.Read(*this);
}
ScrollbarLayerType GetScrollbarLayerType() const override;
protected:
explicit PaintedScrollbarLayer(scoped_refptr<Scrollbar> scrollbar);
~PaintedScrollbarLayer() override;
void PushDirtyPropertiesTo(
LayerImpl* layer,
uint8_t dirty_flag,
const CommitState& commit_state,
const ThreadUnsafeCommitState& unsafe_state) override;
// For unit tests
UIResourceId track_and_buttons_resource_id() {
if (const auto* resource = track_and_buttons_resource_.Read(*this)) {
return resource->id();
}
return 0;
}
UIResourceId thumb_resource_id() {
if (const auto* thumb_resource = thumb_resource_.Read(*this))
return thumb_resource->id();
return 0;
}
bool UpdateInternalContentScale();
bool UpdateGeometry();
private:
gfx::Size LayerSizeToContentSize(const gfx::Size& layer_size) const;
bool UpdateThumbIfNeeded();
bool UpdateTrackAndButtonsIfNeeded(bool force_repaint_for_nine_patch);
template <typename T>
bool UpdateProperty(T value, T* prop) {
if (*prop == value)
return false;
*prop = value;
SetNeedsPushProperties();
return true;
}
UIResourceBitmap RasterizeScrollbarPart(
const gfx::Size& size,
const gfx::Size& requested_content_size,
base::FunctionRef<void(PaintCanvas&)> paint_function);
ProtectedSequenceForbidden<scoped_refptr<Scrollbar>> scrollbar_;
ProtectedSequenceReadable<ElementId> scroll_element_id_;
ProtectedSequenceReadable<float> internal_contents_scale_;
ProtectedSequenceReadable<gfx::Size> internal_content_bounds_;
// Snapshot of properties taken in UpdateGeometry and used in
// PushPropertiesTo.
ProtectedSequenceReadable<gfx::Size> thumb_size_;
ProtectedSequenceReadable<gfx::Rect> track_rect_;
ProtectedSequenceReadable<gfx::Rect> back_button_rect_;
ProtectedSequenceReadable<gfx::Rect> forward_button_rect_;
ProtectedSequenceReadable<float> painted_opacity_;
ProtectedSequenceReadable<bool> has_thumb_;
ProtectedSequenceReadable<bool> jump_on_track_click_;
ProtectedSequenceReadable<std::optional<SkColor4f>> thumb_color_;
ProtectedSequenceReadable<gfx::Rect> track_and_buttons_aperture_;
const bool supports_drag_snap_back_;
const bool is_overlay_;
const bool is_web_test_;
const bool uses_nine_patch_track_and_buttons_;
const bool uses_solid_color_thumb_;
ProtectedSequenceReadable<std::unique_ptr<ScopedUIResource>>
track_and_buttons_resource_;
ProtectedSequenceReadable<std::unique_ptr<ScopedUIResource>> thumb_resource_;
};
} // namespace cc
#endif // CC_LAYERS_PAINTED_SCROLLBAR_LAYER_H_
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