widget/ThemeColors.h

   1 /* -*- Mode: C++; tab-width: 40; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* This Source Code Form is subject to the terms of the Mozilla Public
   3  * License, v. 2.0. If a copy of the MPL was not distributed with this
   4  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   5
   6 #ifndef mozilla_widget_ThemeColors_h
   7 #define mozilla_widget_ThemeColors_h
   8
   9 #include "mozilla/dom/Document.h"
  10 #include "mozilla/gfx/Types.h"
  11 #include "mozilla/LookAndFeel.h"
  12 #include "nsIFrame.h"
  13
  14 namespace mozilla::widget {
  15
  16 static constexpr gfx::sRGBColor sDefaultAccent(
  17     gfx::sRGBColor::UnusualFromARGB(0xff0060df));  // Luminance: 13.69346%
  18 static constexpr gfx::sRGBColor sDefaultAccentText(
  19     gfx::sRGBColor::OpaqueWhite());
  20
  21 struct ColorPalette;
  22
  23 class ThemeAccentColor {
  24  protected:
  25   using sRGBColor = mozilla::gfx::sRGBColor;
  26   using ComputedStyle = mozilla::ComputedStyle;
  27
  28   Maybe<nscolor> mAccentColor;
  29   const ColorPalette* mDefaultPalette = nullptr;
  30
  31  public:
  32   explicit ThemeAccentColor(const ComputedStyle&, ColorScheme);
  33   virtual ~ThemeAccentColor() = default;
  34
  35   sRGBColor Get() const;
  36   sRGBColor GetForeground() const;
  37   sRGBColor GetLight() const;
  38   sRGBColor GetDark() const;
  39   sRGBColor GetDarker() const;
  40 };
  41
  42 // Widget color information associated to a particular frame.
  43 class ThemeColors {
  44  protected:
  45   using Document = mozilla::dom::Document;
  46   using sRGBColor = mozilla::gfx::sRGBColor;
  47   using LookAndFeel = mozilla::LookAndFeel;
  48   using StyleSystemColor = mozilla::StyleSystemColor;
  49   using AccentColor = ThemeAccentColor;
  50
  51   const Document& mDoc;
  52   const bool mHighContrast;
  53   const ColorScheme mColorScheme;
  54   const AccentColor mAccentColor;
  55
  56  public:
  57   explicit ThemeColors(const nsIFrame* aFrame, StyleAppearance aAppearance)
  58       : mDoc(*aFrame->PresContext()->Document()),
  59         mHighContrast(ShouldBeHighContrast(*aFrame->PresContext())),
  60         mColorScheme(ColorSchemeForWidget(aFrame, aAppearance, mHighContrast)),
  61         mAccentColor(*aFrame->Style(), mColorScheme) {}
  62   virtual ~ThemeColors() = default;
  63
  64   [[nodiscard]] static float ScaleLuminanceBy(float aLuminance, float aFactor) {
  65     return aLuminance >= 0.18f ? aLuminance * aFactor : aLuminance / aFactor;
  66   }
  67
  68   const AccentColor& Accent() const { return mAccentColor; }
  69   bool HighContrast() const { return mHighContrast; }
  70   bool IsDark() const { return mColorScheme == ColorScheme::Dark; }
  71
  72   nscolor SystemNs(StyleSystemColor aColor) const {
  73     return LookAndFeel::Color(aColor, mColorScheme,
  74                               LookAndFeel::ShouldUseStandins(mDoc, aColor));
  75   }
  76
  77   sRGBColor System(StyleSystemColor aColor) const {
  78     return sRGBColor::FromABGR(SystemNs(aColor));
  79   }
  80
  81   template <typename Compute>
  82   sRGBColor SystemOrElse(StyleSystemColor aColor, Compute aCompute) const {
  83     if (auto color = LookAndFeel::GetColor(
  84             aColor, mColorScheme,
  85             LookAndFeel::ShouldUseStandins(mDoc, aColor))) {
  86       return sRGBColor::FromABGR(*color);
  87     }
  88     return aCompute();
  89   }
  90
  91   std::pair<sRGBColor, sRGBColor> SystemPair(StyleSystemColor aFirst,
  92                                              StyleSystemColor aSecond) const {
  93     return std::make_pair(System(aFirst), System(aSecond));
  94   }
  95
  96   // Whether we should use system colors (for high contrast mode).
  97   static bool ShouldBeHighContrast(const nsPresContext&);
  98   static ColorScheme ColorSchemeForWidget(const nsIFrame*, StyleAppearance,
  99                                           bool aHighContrast);
 100
 101   static void RecomputeAccentColors();
 102
 103   static nscolor ComputeCustomAccentForeground(nscolor aColor);
 104
 105   static nscolor AdjustUnthemedScrollbarThumbColor(nscolor aFaceColor,
 106                                                    dom::ElementState aStates);
 107 };
 108
 109 }  // namespace mozilla::widget
 110
 111 #endif