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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.
- #ifndef CC_LAYERS_PAINTED_SCROLLBAR_LAYER_H_
- #define CC_LAYERS_PAINTED_SCROLLBAR_LAYER_H_
- #include <memory>
- #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 {
- 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;
- void PushPropertiesTo(LayerImpl* layer,
- const CommitState& commit_state,
- const ThreadUnsafeCommitState& unsafe_state) 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;
- // For unit tests
- UIResourceId track_resource_id() {
- if (const auto* track_resource = track_resource_.Read(*this))
- return track_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 UpdateThumbAndTrackGeometry();
- private:
- 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;
- SetNeedsPushProperties();
- return true;
- }
- UIResourceBitmap RasterizeScrollbarPart(
- const gfx::Size& size,
- const gfx::Size& requested_content_size,
- ScrollbarPart part);
- 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 UpdateThumbAndTrackGeometry 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_;
- const bool supports_drag_snap_back_;
- const bool is_overlay_;
- ProtectedSequenceReadable<std::unique_ptr<ScopedUIResource>> track_resource_;
- ProtectedSequenceReadable<std::unique_ptr<ScopedUIResource>> thumb_resource_;
- };
- } // namespace cc
- #endif // CC_LAYERS_PAINTED_SCROLLBAR_LAYER_H_
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