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// Copyright 2014 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 THIRD_PARTY_BLINK_RENDERER_PLATFORM_SCROLL_SCROLLBAR_LAYER_DELEGATE_H_
#define THIRD_PARTY_BLINK_RENDERER_PLATFORM_SCROLL_SCROLLBAR_LAYER_DELEGATE_H_
#include <memory>
#include "base/macros.h"
#include "cc/input/scrollbar.h"
#include "cc/paint/paint_canvas.h"
#include "third_party/blink/renderer/platform/heap/handle.h"
#include "third_party/blink/renderer/platform/platform_export.h"
namespace cc {
class PaintCanvas;
}
namespace blink {
class Scrollbar;
class ScrollbarTheme;
// Implementation of cc::Scrollbar, providing a delegate to query about
// scrollbar state and to paint the image in the scrollbar.
class PLATFORM_EXPORT ScrollbarLayerDelegate : public cc::Scrollbar {
public:
ScrollbarLayerDelegate(blink::Scrollbar& scrollbar,
float device_scale_factor);
~ScrollbarLayerDelegate() override;
// cc::Scrollbar implementation.
cc::ScrollbarOrientation Orientation() const override;
bool IsLeftSideVerticalScrollbar() const override;
bool HasThumb() const override;
bool IsOverlay() const override;
gfx::Point Location() const override;
int ThumbThickness() const override;
int ThumbLength() const override;
gfx::Rect TrackRect() const override;
float ThumbOpacity() const override;
bool NeedsPaintPart(cc::ScrollbarPart part) const override;
bool HasTickmarks() const override;
void PaintPart(cc::PaintCanvas* canvas,
cc::ScrollbarPart part,
const gfx::Rect& content_rect) override;
bool UsesNinePatchThumbResource() const override;
gfx::Size NinePatchThumbCanvasSize() const override;
gfx::Rect NinePatchThumbAperture() const override;
private:
// Accessed by main and compositor threads, e.g., the compositor thread
// checks |Orientation()|.
CrossThreadPersistent<blink::Scrollbar> scrollbar_;
ScrollbarTheme& theme_;
float device_scale_factor_;
DISALLOW_COPY_AND_ASSIGN(ScrollbarLayerDelegate);
};
} // namespace blink
#endif // THIRD_PARTY_BLINK_RENDERER_PLATFORM_SCROLL_SCROLLBAR_LAYER_DELEGATE_H_
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