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 sDefaultAccentForeground(
  19     gfx::sRGBColor::OpaqueWhite());
  20
  21 class ThemeAccentColor {
  22  protected:
  23   using sRGBColor = mozilla::gfx::sRGBColor;
  24   using ComputedStyle = mozilla::ComputedStyle;
  25
  26   Maybe<nscolor> mAccentColor;
  27
  28  public:
  29   explicit ThemeAccentColor(const ComputedStyle& aStyle);
  30   virtual ~ThemeAccentColor() = default;
  31
  32   sRGBColor Get() const;
  33   sRGBColor GetForeground() const;
  34   sRGBColor GetLight() const;
  35   sRGBColor GetDark() const;
  36   sRGBColor GetDarker() const;
  37 };
  38
  39 // Widget color information associated to a particular frame.
  40 class ThemeColors {
  41  protected:
  42   using Document = mozilla::dom::Document;
  43   using sRGBColor = mozilla::gfx::sRGBColor;
  44   using LookAndFeel = mozilla::LookAndFeel;
  45   using StyleSystemColor = mozilla::StyleSystemColor;
  46   using AccentColor = ThemeAccentColor;
  47
  48   const AccentColor mAccentColor;
  49   const Document& mDoc;
  50   const bool mHighContrast;
  51   const LookAndFeel::ColorScheme mColorScheme;
  52
  53  public:
  54   explicit ThemeColors(const nsIFrame* aFrame, StyleAppearance aAppearance)
  55       : mAccentColor(*aFrame->Style()),
  56         mDoc(*aFrame->PresContext()->Document()),
  57         mHighContrast(ShouldBeHighContrast(*aFrame->PresContext())),
  58         mColorScheme(ColorSchemeForWidget(aFrame, aAppearance, mHighContrast)) {
  59   }
  60   virtual ~ThemeColors() = default;
  61
  62   [[nodiscard]] static float ScaleLuminanceBy(float aLuminance, float aFactor) {
  63     return aLuminance >= 0.18f ? aLuminance * aFactor : aLuminance / aFactor;
  64   }
  65
  66   const AccentColor& Accent() const { return mAccentColor; }
  67   bool HighContrast() const { return mHighContrast; }
  68   bool IsDark() const { return mColorScheme == LookAndFeel::ColorScheme::Dark; }
  69
  70   nscolor SystemNs(StyleSystemColor aColor) const {
  71     return LookAndFeel::Color(aColor, mColorScheme,
  72                               LookAndFeel::ShouldUseStandins(mDoc, aColor));
  73   }
  74
  75   sRGBColor System(StyleSystemColor aColor) const {
  76     return sRGBColor::FromABGR(SystemNs(aColor));
  77   }
  78
  79   template <typename Compute>
  80   sRGBColor SystemOrElse(StyleSystemColor aColor, Compute aCompute) const {
  81     if (auto color = LookAndFeel::GetColor(
  82             aColor, mColorScheme,
  83             LookAndFeel::ShouldUseStandins(mDoc, aColor))) {
  84       return sRGBColor::FromABGR(*color);
  85     }
  86     return aCompute();
  87   }
  88
  89   std::pair<sRGBColor, sRGBColor> SystemPair(StyleSystemColor aFirst,
  90                                              StyleSystemColor aSecond) const {
  91     return std::make_pair(System(aFirst), System(aSecond));
  92   }
  93
  94   // Whether we should use system colors (for high contrast mode).
  95   static bool ShouldBeHighContrast(const nsPresContext&);
  96   static ColorScheme ColorSchemeForWidget(const nsIFrame*, StyleAppearance,
  97                                           bool aHighContrast);
  98
  99   static void RecomputeAccentColors();
 100
 101   static nscolor ComputeCustomAccentForeground(nscolor aColor);
 102
 103   static nscolor AdjustUnthemedScrollbarThumbColor(nscolor aFaceColor,
 104                                                    EventStates aStates);
 105 };
 106
 107 }  // namespace mozilla::widget
 108
 109 #endif