blob: 66804d09b1391428f5233a9be675c925a9a081fc [file] [log] [blame]
// 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.
#include <memory>
#include "base/macros.h"
#include "cc/input/scrollbar.h"
#include "cc/paint/paint_canvas.h"
#include "third_party/blink/renderer/core/core_export.h"
#include "third_party/blink/renderer/platform/heap/persistent.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 CORE_EXPORT ScrollbarLayerDelegate : public cc::Scrollbar {
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;
// Accessed by main and compositor threads, e.g., the compositor thread
// checks |Orientation()|.
CrossThreadPersistent<blink::Scrollbar> scrollbar_;
ScrollbarTheme& theme_;
float device_scale_factor_;
} // namespace blink