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- // Copyright 2016 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_OVERLAY_SCROLLBAR_LAYER_H_
- #define CC_LAYERS_PAINTED_OVERLAY_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 {
- // For composited overlay scrollbars with nine-patch thumb. For overlay
- // scrollbars whose thumb is not nine-patch, use PaintedScrollbarLayer or
- // SolidColorScrollbarLayer. In practice, this is used for non-custom
- // overlay scrollbars on Win/Linux.
- class CC_EXPORT PaintedOverlayScrollbarLayer : public ScrollbarLayerBase {
- public:
- std::unique_ptr<LayerImpl> CreateLayerImpl(
- LayerTreeImpl* tree_impl) const override;
- static scoped_refptr<PaintedOverlayScrollbarLayer> CreateOrReuse(
- scoped_refptr<Scrollbar> scrollbar,
- PaintedOverlayScrollbarLayer* existing_layer);
- static scoped_refptr<PaintedOverlayScrollbarLayer> Create(
- scoped_refptr<Scrollbar> scrollbar);
- PaintedOverlayScrollbarLayer(const PaintedOverlayScrollbarLayer&) = delete;
- PaintedOverlayScrollbarLayer& operator=(const PaintedOverlayScrollbarLayer&) =
- 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;
- ScrollbarLayerType GetScrollbarLayerType() const override;
- protected:
- explicit PaintedOverlayScrollbarLayer(scoped_refptr<Scrollbar> scrollbar);
- ~PaintedOverlayScrollbarLayer() override;
- private:
- template <typename T>
- bool UpdateProperty(const T value, T* prop) {
- if (*prop == value)
- return false;
- *prop = value;
- SetNeedsPushProperties();
- return true;
- }
- bool PaintThumbIfNeeded();
- bool PaintTickmarks();
- ProtectedSequenceForbidden<scoped_refptr<Scrollbar>> scrollbar_;
- ProtectedSequenceReadable<gfx::Size> thumb_size_;
- ProtectedSequenceReadable<gfx::Rect> track_rect_;
- ProtectedSequenceReadable<gfx::Rect> aperture_;
- ProtectedSequenceReadable<std::unique_ptr<ScopedUIResource>> thumb_resource_;
- ProtectedSequenceReadable<std::unique_ptr<ScopedUIResource>> track_resource_;
- };
- } // namespace cc
- #endif // CC_LAYERS_PAINTED_OVERLAY_SCROLLBAR_LAYER_H_
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