layout/style/PreferenceSheet.h

   1 /* -*- Mode: C++; tab-width: 8; indent-tabs-mode: nil; c-basic-offset: 2 -*- */
   2 /* vim: set ts=8 sts=2 et sw=2 tw=80: */
   3 /* This Source Code Form is subject to the terms of the Mozilla Public
   4  * License, v. 2.0. If a copy of the MPL was not distributed with this
   5  * file, You can obtain one at http://mozilla.org/MPL/2.0/. */
   6
   7 /* Some prefable colors for style system use */
   8
   9 #ifndef mozilla_ColorPreferences_h
  10 #define mozilla_ColorPreferences_h
  11
  12 #include "nsColor.h"
  13 #include "mozilla/ColorScheme.h"
  14
  15 namespace mozilla {
  16
  17 namespace dom {
  18 class Document;
  19 }
  20
  21 struct PreferenceSheet {
  22   struct Prefs {
  23     struct Colors {
  24       nscolor mLink = NS_RGB(0x00, 0x00, 0xEE);
  25       nscolor mActiveLink = NS_RGB(0xEE, 0x00, 0x00);
  26       nscolor mVisitedLink = NS_RGB(0x55, 0x1A, 0x8B);
  27
  28       nscolor mDefault = NS_RGB(0, 0, 0);
  29       nscolor mDefaultBackground = NS_RGB(0xFF, 0xFF, 0xFF);
  30
  31       nscolor mFocusText = mDefault;
  32       nscolor mFocusBackground = mDefaultBackground;
  33     } mLightColors, mDarkColors;
  34
  35     const Colors& ColorsFor(ColorScheme aScheme) const {
  36       return mMustUseLightColorSet || aScheme == ColorScheme::Light
  37                  ? mLightColors
  38                  : mDarkColors;
  39     }
  40
  41     bool mIsChrome = false;
  42     bool mUseAccessibilityTheme = false;
  43     bool mUseDocumentColors = true;
  44     bool mUsePrefColors = false;
  45     bool mUseStandins = false;
  46     bool mMustUseLightColorSet = false;
  47
  48     // Sometimes we can force a color scheme on a document, or honor the
  49     // preferred color-scheme in more cases, depending on whether we're forcing
  50     // colors or not.
  51     enum class ColorSchemeChoice : uint8_t {
  52       // We're not forcing colors, use standard algorithm based on specified
  53       // style and meta tags and so on.
  54       Standard,
  55       // We can honor whatever the preferred color-scheme for the document is
  56       // (the preferred color-scheme of the user, since we're forcing colors).
  57       UserPreferred,
  58       Light,
  59       Dark,
  60     };
  61
  62     ColorSchemeChoice mColorSchemeChoice = ColorSchemeChoice::Standard;
  63
  64     // Whether the non-native theme should use real system colors for widgets.
  65     bool NonNativeThemeShouldBeHighContrast() const;
  66
  67     void Load(bool aIsChrome);
  68     void LoadColors(bool aIsLight);
  69   };
  70
  71   static void EnsureInitialized() {
  72     if (sInitialized) {
  73       return;
  74     }
  75     Initialize();
  76   }
  77
  78   static void Refresh() {
  79     sInitialized = false;
  80     Initialize();
  81   }
  82
  83   static bool AffectedByPref(const nsACString&);
  84
  85   static Prefs& ContentPrefs() {
  86     MOZ_ASSERT(sInitialized);
  87     return sContentPrefs;
  88   }
  89
  90   static Prefs& ChromePrefs() {
  91     MOZ_ASSERT(sInitialized);
  92     return sChromePrefs;
  93   }
  94
  95   static Prefs& PrintPrefs() {
  96     MOZ_ASSERT(sInitialized);
  97     return sPrintPrefs;
  98   }
  99
 100   enum class PrefsKind {
 101     Chrome,
 102     Print,
 103     Content,
 104   };
 105
 106   static PrefsKind PrefsKindFor(const dom::Document&);
 107
 108   static bool ShouldUseChromePrefs(const dom::Document& aDocument) {
 109     return PrefsKindFor(aDocument) == PrefsKind::Chrome;
 110   }
 111
 112   static bool MayForceColors() { return !ContentPrefs().mUseDocumentColors; }
 113
 114   static const Prefs& PrefsFor(const dom::Document& aDocument) {
 115     switch (PrefsKindFor(aDocument)) {
 116       case PrefsKind::Chrome:
 117         return ChromePrefs();
 118       case PrefsKind::Print:
 119         return PrintPrefs();
 120       case PrefsKind::Content:
 121         break;
 122     }
 123     return ContentPrefs();
 124   }
 125
 126  private:
 127   static bool sInitialized;
 128   static Prefs sChromePrefs;
 129   static Prefs sPrintPrefs;
 130   static Prefs sContentPrefs;
 131
 132   static void Initialize();
 133 };
 134
 135 }  // namespace mozilla
 136
 137 #endif