gecko-dev/widget/ScrollbarDrawingWin.h

/* -*- Mode: C++; tab-width: 40; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* This Source Code Form is subject to the terms of the Mozilla Public
 * License, v. 2.0. If a copy of the MPL was not distributed with this
 * file, You can obtain one at http://mozilla.org/MPL/2.0/. */

#ifndef mozilla_widget_ScrollbarDrawingWin_h
#define mozilla_widget_ScrollbarDrawingWin_h

#include "nsITheme.h"
#include "nsNativeTheme.h"
#include "ScrollbarDrawing.h"

namespace mozilla::widget {

class ScrollbarDrawingWin : public ScrollbarDrawing {
 protected:
  explicit ScrollbarDrawingWin(Kind aKind) : ScrollbarDrawing(aKind) {}

 public:
  ScrollbarDrawingWin() : ScrollbarDrawingWin(Kind::Win10) {}

  virtual ~ScrollbarDrawingWin() = default;

  LayoutDeviceIntSize GetMinimumWidgetSize(nsPresContext*,
                                           StyleAppearance aAppearance,
                                           nsIFrame* aFrame) override;

  Maybe<nsITheme::Transparency> GetScrollbarPartTransparency(
      nsIFrame* aFrame, StyleAppearance aAppearance) override;

  template <typename PaintBackendData>
  bool DoPaintScrollbarThumb(PaintBackendData&, const LayoutDeviceRect&,
                             ScrollbarKind, nsIFrame*, const ComputedStyle&,
                             const ElementState& aElementState,
                             const DocumentState& aDocumentState, const Colors&,
                             const DPIRatio&);
  bool PaintScrollbarThumb(DrawTarget&, const LayoutDeviceRect&, ScrollbarKind,
                           nsIFrame*, const ComputedStyle&,
                           const ElementState& aElementState,
                           const DocumentState& aDocumentState, const Colors&,
                           const DPIRatio&) override;
  bool PaintScrollbarThumb(WebRenderBackendData&, const LayoutDeviceRect&,
                           ScrollbarKind, nsIFrame*, const ComputedStyle&,
                           const ElementState& aElementState,
                           const DocumentState& aDocumentState, const Colors&,
                           const DPIRatio&) override;

  void RecomputeScrollbarParams() override;
};

static constexpr uint32_t kDefaultWinScrollbarSize = 17;

}  // namespace mozilla::widget

#endif