chrome/browser/ui/webui/options/font_settings_handler.h

   1 // Copyright (c) 2012 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 CHROME_BROWSER_UI_WEBUI_OPTIONS_FONT_SETTINGS_HANDLER_H_
   6 #define CHROME_BROWSER_UI_WEBUI_OPTIONS_FONT_SETTINGS_HANDLER_H_
   7
   8 #include "base/memory/scoped_ptr.h"
   9 #include "base/prefs/pref_member.h"
  10 #include "base/scoped_observer.h"
  11 #include "chrome/browser/ui/webui/options/options_ui.h"
  12 #include "extensions/browser/extension_registry_observer.h"
  13
  14 namespace base {
  15 class ListValue;
  16 }
  17
  18 namespace extensions {
  19 class Extension;
  20 class ExtensionRegistry;
  21 }
  22
  23 namespace options {
  24
  25 // Font settings overlay page UI handler.
  26 class FontSettingsHandler : public OptionsPageUIHandler,
  27                             public extensions::ExtensionRegistryObserver {
  28  public:
  29   FontSettingsHandler();
  30   ~FontSettingsHandler() override;
  31
  32   // OptionsPageUIHandler implementation.
  33   void GetLocalizedValues(base::DictionaryValue* localized_strings) override;
  34   void InitializeHandler() override;
  35   void InitializePage() override;
  36
  37   // WebUIMessageHandler implementation.
  38   void RegisterMessages() override;
  39
  40   // ExtensionRegistryObserver implementation.
  41   void OnExtensionLoaded(content::BrowserContext* browser_context,
  42                          const extensions::Extension* extension) override;
  43   void OnExtensionUnloaded(
  44       content::BrowserContext* browser_context,
  45       const extensions::Extension* extension,
  46       extensions::UnloadedExtensionInfo::Reason reason) override;
  47
  48  private:
  49   void HandleFetchFontsData(const base::ListValue* args);
  50
  51   void FontsListHasLoaded(scoped_ptr<base::ListValue> list);
  52
  53   void SetUpStandardFontSample();
  54   void SetUpSerifFontSample();
  55   void SetUpSansSerifFontSample();
  56   void SetUpFixedFontSample();
  57   void SetUpMinimumFontSample();
  58
  59   // Returns the Advanced Font Settings Extension if it's installed and enabled,
  60   // or NULL otherwise.
  61   const extensions::Extension* GetAdvancedFontSettingsExtension();
  62   // Notifies the web UI about whether the Advanced Font Settings Extension is
  63   // installed and enabled.
  64   void NotifyAdvancedFontSettingsAvailability();
  65   // Opens the options page of the Advanced Font Settings Extension.
  66   void HandleOpenAdvancedFontSettingsOptions(const base::ListValue* args);
  67
  68   void OnWebKitDefaultFontSizeChanged();
  69
  70   StringPrefMember standard_font_;
  71   StringPrefMember serif_font_;
  72   StringPrefMember sans_serif_font_;
  73   StringPrefMember fixed_font_;
  74   StringPrefMember font_encoding_;
  75   IntegerPrefMember default_font_size_;
  76   IntegerPrefMember default_fixed_font_size_;
  77   IntegerPrefMember minimum_font_size_;
  78
  79   ScopedObserver<extensions::ExtensionRegistry,
  80                  extensions::ExtensionRegistryObserver>
  81       extension_registry_observer_;
  82
  83   DISALLOW_COPY_AND_ASSIGN(FontSettingsHandler);
  84 };
  85
  86 }  // namespace options
  87
  88 #endif  // CHROME_BROWSER_UI_WEBUI_OPTIONS_FONT_SETTINGS_HANDLER_H_