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Diffstat (limited to '')
| -rw-r--r-- | widget/ScrollbarDrawing.h | 167 |
1 files changed, 167 insertions, 0 deletions
diff --git a/widget/ScrollbarDrawing.h b/widget/ScrollbarDrawing.h new file mode 100644 index 0000000000..fa653d8b22 --- /dev/null +++ b/widget/ScrollbarDrawing.h @@ -0,0 +1,167 @@ +/* -*- 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 ScrollbarSizes = nsITheme::ScrollbarSizes; + 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, + }; + + static DPIRatio GetDPIRatioForScrollbarPart(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); + + virtual ScrollbarSizes GetScrollbarSizes(nsPresContext*, StyleScrollbarWidth, + Overlay); + ScrollbarSizes GetScrollbarSizes(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; } + + uint32_t GetHorizontalScrollbarHeight() const { + return mHorizontalScrollbarHeight; + } + uint32_t GetVerticalScrollbarWidth() const { return mVerticalScrollbarWidth; } + + 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; + uint32_t mHorizontalScrollbarHeight = 0; + uint32_t mVerticalScrollbarWidth = 0; +}; + +} // namespace mozilla::widget + +#endif |