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// Copyright 2016 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_NINE_PATCH_THUMB_SCROLLBAR_LAYER_H_
#define CC_LAYERS_NINE_PATCH_THUMB_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 scrollbars with nine-patch thumb. The track is not painted
// unless there are tick marks. In practice, this is used for non-custom
// overlay aura scrollbars on non-Mac desktop platforms.
class CC_EXPORT NinePatchThumbScrollbarLayer : public ScrollbarLayerBase {
public:
std::unique_ptr<LayerImpl> CreateLayerImpl(
LayerTreeImpl* tree_impl) const override;
static scoped_refptr<NinePatchThumbScrollbarLayer> CreateOrReuse(
scoped_refptr<Scrollbar> scrollbar,
NinePatchThumbScrollbarLayer* existing_layer);
static scoped_refptr<NinePatchThumbScrollbarLayer> Create(
scoped_refptr<Scrollbar> scrollbar);
NinePatchThumbScrollbarLayer(const NinePatchThumbScrollbarLayer&) = delete;
NinePatchThumbScrollbarLayer& operator=(const NinePatchThumbScrollbarLayer&) =
delete;
bool OpacityCanAnimateOnImplThread() const override;
bool Update() override;
void SetLayerTreeHost(LayerTreeHost* host) override;
ScrollbarLayerType GetScrollbarLayerType() const override;
protected:
explicit NinePatchThumbScrollbarLayer(scoped_refptr<Scrollbar> scrollbar);
~NinePatchThumbScrollbarLayer() override;
void PushDirtyPropertiesTo(
LayerImpl* layer,
uint8_t dirty_flag,
const CommitState& commit_state,
const ThreadUnsafeCommitState& unsafe_state) 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_and_buttons_resource_;
};
} // namespace cc
#endif // CC_LAYERS_NINE_PATCH_THUMB_SCROLLBAR_LAYER_H_
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