components/dom_distiller/core/distilled_page_prefs.h

   1 // Copyright 2014 The Chromium Authors. All rights reserved.
   2 // Use of this source code is governed by a BSD-style license that can be
   3 // found in the LICENSE file.
   4
   5 #ifndef COMPONENTS_DOM_DISTILLER_CORE_DISTILLED_PAGE_PREFS_H_
   6 #define COMPONENTS_DOM_DISTILLER_CORE_DISTILLED_PAGE_PREFS_H_
   7
   8 #include "base/macros.h"
   9 #include "base/memory/weak_ptr.h"
  10 #include "base/observer_list.h"
  11
  12 class PrefService;
  13
  14 namespace user_prefs {
  15 class PrefRegistrySyncable;
  16 }
  17
  18 namespace dom_distiller {
  19
  20 // Interface for preferences used for distilled page.
  21 class DistilledPagePrefs {
  22  public:
  23   // Possible font families for distilled page.
  24   enum FontFamily {
  25 #define DEFINE_FONT_FAMILY(name, value) name = value,
  26 #include "components/dom_distiller/core/font_family_list.h"
  27 #undef DEFINE_FONT_FAMILY
  28   };
  29
  30   // Possible themes for distilled page.
  31   enum Theme {
  32 #define DEFINE_THEME(name, value) name = value,
  33 #include "components/dom_distiller/core/theme_list.h"
  34 #undef DEFINE_THEME
  35   };
  36
  37   class Observer {
  38    public:
  39     virtual void OnChangeFontFamily(FontFamily font) = 0;
  40     virtual void OnChangeTheme(Theme theme) = 0;
  41   };
  42
  43   explicit DistilledPagePrefs(PrefService* pref_service);
  44   ~DistilledPagePrefs();
  45
  46   static void RegisterProfilePrefs(user_prefs::PrefRegistrySyncable* registry);
  47
  48   // Sets the user's preference for the font family of distilled pages.
  49   void SetFontFamily(FontFamily new_font);
  50   // Returns the user's preference for the font family of distilled pages.
  51   FontFamily GetFontFamily();
  52
  53   // Sets the user's preference for the theme of distilled pages.
  54   void SetTheme(Theme new_theme);
  55   // Returns the user's preference for the theme of distilled pages.
  56   Theme GetTheme();
  57
  58   void AddObserver(Observer* obs);
  59   void RemoveObserver(Observer* obs);
  60
  61  private:
  62   // Notifies all Observers of new font family.
  63   void NotifyOnChangeFontFamily(FontFamily font_family);
  64   // Notifies all Observers of new theme.
  65   void NotifyOnChangeTheme(Theme theme);
  66
  67   PrefService* pref_service_;
  68   base::ObserverList<Observer> observers_;
  69
  70   base::WeakPtrFactory<DistilledPagePrefs> weak_ptr_factory_;
  71
  72   DISALLOW_COPY_AND_ASSIGN(DistilledPagePrefs);
  73 };
  74
  75 }  // namespace dom_distiller
  76
  77 #endif  // COMPONENTS_DOM_DISTILLER_CORE_DISTILLED_PAGE_PREFS_H_