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/* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
/* vim: set ts=8 sts=2 et sw=2 tw=80: */
/* 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_ScrollbarDrawing_h
#define mozilla_widget_ScrollbarDrawing_h
#include "mozilla/dom/RustTypes.h"
#include "mozilla/gfx/2D.h"
#include "nsColor.h"
#include "nsITheme.h"
#include "ThemeColors.h"
#include "ThemeDrawing.h"
#include "Units.h"
namespace mozilla::widget {
class ScrollbarDrawing {
protected:
using DPIRatio = mozilla::CSSToLayoutDeviceScale;
using ElementState = dom::ElementState;
using DocumentState = dom::DocumentState;
using DrawTarget = mozilla::gfx::DrawTarget;
using sRGBColor = mozilla::gfx::sRGBColor;
using Colors = ThemeColors;
using Overlay = nsITheme::Overlay;
using WebRenderBackendData = mozilla::widget::WebRenderBackendData;
enum class Kind : uint8_t {
Android,
Cocoa,
Gtk,
Win10,
Win11,
};
explicit ScrollbarDrawing(Kind aKind) : mKind(aKind) {}
public:
virtual ~ScrollbarDrawing() = default;
enum class ScrollbarKind : uint8_t {
Horizontal,
VerticalLeft,
VerticalRight,
};
DPIRatio GetDPIRatioForScrollbarPart(const nsPresContext*);
static nsIFrame* GetParentScrollbarFrame(nsIFrame* aFrame);
static bool IsParentScrollbarRolledOver(nsIFrame* aFrame);
static bool IsParentScrollbarHoveredOrActive(nsIFrame* aFrame);
static bool IsScrollbarWidthThin(const ComputedStyle& aStyle);
static bool IsScrollbarWidthThin(nsIFrame* aFrame);
CSSIntCoord GetCSSScrollbarSize(StyleScrollbarWidth, Overlay) const;
LayoutDeviceIntCoord GetScrollbarSize(const nsPresContext*,
StyleScrollbarWidth, Overlay);
LayoutDeviceIntCoord GetScrollbarSize(const nsPresContext*, nsIFrame*);
virtual LayoutDeviceIntSize GetMinimumWidgetSize(nsPresContext*,
StyleAppearance aAppearance,
nsIFrame* aFrame) = 0;
virtual Maybe<nsITheme::Transparency> GetScrollbarPartTransparency(
nsIFrame* aFrame, StyleAppearance aAppearance) {
return Nothing();
}
bool IsScrollbarTrackOpaque(nsIFrame*);
virtual sRGBColor ComputeScrollbarTrackColor(nsIFrame*, const ComputedStyle&,
const DocumentState&,
const Colors&);
virtual sRGBColor ComputeScrollbarThumbColor(nsIFrame*, const ComputedStyle&,
const ElementState&,
const DocumentState&,
const Colors&);
nscolor GetScrollbarButtonColor(nscolor aTrackColor, ElementState);
Maybe<nscolor> GetScrollbarArrowColor(nscolor aButtonColor);
// Returned colors are button, arrow.
virtual std::pair<sRGBColor, sRGBColor> ComputeScrollbarButtonColors(
nsIFrame*, StyleAppearance, const ComputedStyle&, const ElementState&,
const DocumentState&, const Colors&);
virtual bool PaintScrollbarButton(DrawTarget&, StyleAppearance,
const LayoutDeviceRect&, ScrollbarKind,
nsIFrame*, const ComputedStyle&,
const ElementState&, const DocumentState&,
const Colors&, const DPIRatio&);
virtual bool PaintScrollbarThumb(DrawTarget&, const LayoutDeviceRect&,
ScrollbarKind, nsIFrame*,
const ComputedStyle&, const ElementState&,
const DocumentState&, const Colors&,
const DPIRatio&) = 0;
virtual bool PaintScrollbarThumb(WebRenderBackendData&,
const LayoutDeviceRect&, ScrollbarKind,
nsIFrame*, const ComputedStyle&,
const ElementState&, const DocumentState&,
const Colors&, const DPIRatio&) = 0;
template <typename PaintBackendData>
bool DoPaintDefaultScrollbar(PaintBackendData&, const LayoutDeviceRect&,
ScrollbarKind, nsIFrame*, const ComputedStyle&,
const ElementState&, const DocumentState&,
const Colors&, const DPIRatio&);
bool PaintScrollbar(DrawTarget&, const LayoutDeviceRect&, ScrollbarKind,
nsIFrame*, const ComputedStyle&, const ElementState&,
const DocumentState&, const Colors&, const DPIRatio&);
bool PaintScrollbar(WebRenderBackendData&, const LayoutDeviceRect&,
ScrollbarKind, nsIFrame*, const ComputedStyle&,
const ElementState&, const DocumentState&, const Colors&,
const DPIRatio&);
virtual bool PaintScrollbarTrack(DrawTarget&, const LayoutDeviceRect&,
ScrollbarKind, nsIFrame*,
const ComputedStyle&, const DocumentState&,
const Colors&, const DPIRatio&) {
// Draw nothing by default. Subclasses can override this.
return true;
}
virtual bool PaintScrollbarTrack(WebRenderBackendData&,
const LayoutDeviceRect&, ScrollbarKind,
nsIFrame*, const ComputedStyle&,
const DocumentState&, const Colors&,
const DPIRatio&) {
// Draw nothing by default. Subclasses can override this.
return true;
}
template <typename PaintBackendData>
bool DoPaintDefaultScrollCorner(PaintBackendData&, const LayoutDeviceRect&,
ScrollbarKind, nsIFrame*,
const ComputedStyle&, const DocumentState&,
const Colors&, const DPIRatio&);
virtual bool PaintScrollCorner(DrawTarget&, const LayoutDeviceRect&,
ScrollbarKind, nsIFrame*, const ComputedStyle&,
const DocumentState&, const Colors&,
const DPIRatio&);
virtual bool PaintScrollCorner(WebRenderBackendData&, const LayoutDeviceRect&,
ScrollbarKind, nsIFrame*, const ComputedStyle&,
const DocumentState&, const Colors&,
const DPIRatio&);
virtual void RecomputeScrollbarParams() = 0;
virtual bool ShouldDrawScrollbarButtons() { return true; }
private:
// The scrollbar sizes for all our scrollbars. Indices are overlay or not,
// then thin or not. Should be configured via ConfigureScrollbarSize.
CSSIntCoord mScrollbarSize[2][2]{};
protected:
// For some kind of style differences a full virtual method is overkill, so we
// store the kind here so we can branch on it if necessary.
Kind mKind;
// Configures the scrollbar sizes based on a single size.
void ConfigureScrollbarSize(CSSIntCoord);
// Configures a particular scrollbar size.
void ConfigureScrollbarSize(StyleScrollbarWidth, Overlay, CSSIntCoord);
};
} // namespace mozilla::widget
#endif
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