chrome/browser/themes/theme_service.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_THEMES_THEME_SERVICE_H_
   6 #define CHROME_BROWSER_THEMES_THEME_SERVICE_H_
   7
   8 #include <map>
   9 #include <set>
  10 #include <string>
  11 #include <utility>
  12
  13 #include "base/compiler_specific.h"
  14 #include "base/memory/ref_counted.h"
  15 #include "base/memory/scoped_ptr.h"
  16 #include "base/memory/weak_ptr.h"
  17 #include "base/threading/non_thread_safe.h"
  18 #include "components/keyed_service/core/keyed_service.h"
  19 #include "content/public/browser/notification_observer.h"
  20 #include "content/public/browser/notification_registrar.h"
  21 #include "ui/base/theme_provider.h"
  22
  23 class CustomThemeSupplier;
  24 class BrowserThemePack;
  25 class ThemeSyncableService;
  26 class Profile;
  27
  28 namespace base {
  29 class FilePath;
  30 }
  31
  32 namespace color_utils {
  33 struct HSL;
  34 }
  35
  36 namespace extensions {
  37 class Extension;
  38 }
  39
  40 namespace gfx {
  41 class Image;
  42 }
  43
  44 namespace theme_service_internal {
  45 class ThemeServiceTest;
  46 }
  47
  48 namespace ui {
  49 class ResourceBundle;
  50 }
  51
  52 #ifdef __OBJC__
  53 @class NSString;
  54 // Sent whenever the browser theme changes.  Object => NSValue wrapping the
  55 // ThemeService that changed.
  56 extern "C" NSString* const kBrowserThemeDidChangeNotification;
  57 #endif  // __OBJC__
  58
  59 class ThemeService : public base::NonThreadSafe,
  60                      public content::NotificationObserver,
  61                      public KeyedService,
  62                      public ui::ThemeProvider {
  63  public:
  64   // Public constants used in ThemeService and its subclasses:
  65   static const char* kDefaultThemeID;
  66
  67   ThemeService();
  68   virtual ~ThemeService();
  69
  70   virtual void Init(Profile* profile);
  71
  72   // Returns a cross platform image for an id.
  73   //
  74   // TODO(erg): Make this part of the ui::ThemeProvider and the main way to get
  75   // theme properties out of the theme provider since it's cross platform.
  76   virtual gfx::Image GetImageNamed(int id) const;
  77
  78   // Overridden from ui::ThemeProvider:
  79   virtual bool UsingSystemTheme() const override;
  80   virtual gfx::ImageSkia* GetImageSkiaNamed(int id) const override;
  81   virtual SkColor GetColor(int id) const override;
  82   virtual int GetDisplayProperty(int id) const override;
  83   virtual bool ShouldUseNativeFrame() const override;
  84   virtual bool HasCustomImage(int id) const override;
  85   virtual base::RefCountedMemory* GetRawData(
  86       int id,
  87       ui::ScaleFactor scale_factor) const override;
  88 #if defined(OS_MACOSX)
  89   virtual NSImage* GetNSImageNamed(int id) const override;
  90   virtual NSColor* GetNSImageColorNamed(int id) const override;
  91   virtual NSColor* GetNSColor(int id) const override;
  92   virtual NSColor* GetNSColorTint(int id) const override;
  93   virtual NSGradient* GetNSGradient(int id) const override;
  94 #endif
  95
  96   // Overridden from content::NotificationObserver:
  97   virtual void Observe(int type,
  98                        const content::NotificationSource& source,
  99                        const content::NotificationDetails& details) override;
 100
 101   // Set the current theme to the theme defined in |extension|.
 102   // |extension| must already be added to this profile's
 103   // ExtensionService.
 104   virtual void SetTheme(const extensions::Extension* extension);
 105
 106   // Reset the theme to default.
 107   virtual void UseDefaultTheme();
 108
 109   // Set the current theme to the system theme. On some platforms, the system
 110   // theme is the default theme.
 111   virtual void UseSystemTheme();
 112
 113   // Returns true if the default theme and system theme are not the same on
 114   // this platform.
 115   virtual bool IsSystemThemeDistinctFromDefaultTheme() const;
 116
 117   // Whether we're using the chrome default theme. Virtual so linux can check
 118   // if we're using the GTK theme.
 119   virtual bool UsingDefaultTheme() const;
 120
 121   // Gets the id of the last installed theme. (The theme may have been further
 122   // locally customized.)
 123   virtual std::string GetThemeID() const;
 124
 125   // This class needs to keep track of the number of theme infobars so that we
 126   // clean up unused themes.
 127   void OnInfobarDisplayed();
 128
 129   // Decrements the number of theme infobars. If the last infobar has been
 130   // destroyed, uninstalls all themes that aren't the currently selected.
 131   void OnInfobarDestroyed();
 132
 133   // Uninstall theme extensions which are no longer in use. |ignore_infobars| is
 134   // whether unused themes should be removed despite a theme infobar being
 135   // visible.
 136   void RemoveUnusedThemes(bool ignore_infobars);
 137
 138   // Returns the syncable service for syncing theme. The returned service is
 139   // owned by |this| object.
 140   virtual ThemeSyncableService* GetThemeSyncableService() const;
 141
 142   // Save the images to be written to disk, mapping file path to id.
 143   typedef std::map<base::FilePath, int> ImagesDiskCache;
 144
 145  protected:
 146   // Set a custom default theme instead of the normal default theme.
 147   virtual void SetCustomDefaultTheme(
 148       scoped_refptr<CustomThemeSupplier> theme_supplier);
 149
 150   // Returns true if the ThemeService should use the system theme on startup.
 151   virtual bool ShouldInitWithSystemTheme() const;
 152
 153   // Get the specified tint - |id| is one of the TINT_* enum values.
 154   color_utils::HSL GetTint(int id) const;
 155
 156   // Clears all the override fields and saves the dictionary.
 157   virtual void ClearAllThemeData();
 158
 159   // Load theme data from preferences.
 160   virtual void LoadThemePrefs();
 161
 162   // Let all the browser views know that themes have changed.
 163   virtual void NotifyThemeChanged();
 164
 165 #if defined(OS_MACOSX)
 166   // Let all the browser views know that themes have changed in a platform way.
 167   virtual void NotifyPlatformThemeChanged();
 168 #endif  // OS_MACOSX
 169
 170   // Clears the platform-specific caches. Do not call directly; it's called
 171   // from ClearAllThemeData().
 172   virtual void FreePlatformCaches();
 173
 174   Profile* profile() const { return profile_; }
 175
 176   void set_ready() { ready_ = true; }
 177
 178   const CustomThemeSupplier* get_theme_supplier() const {
 179     return theme_supplier_.get();
 180   }
 181
 182   // True if the theme service is ready to be used.
 183   // TODO(pkotwicz): Add DCHECKS to the theme service's getters once
 184   // ThemeSource no longer uses the ThemeService when it is not ready.
 185   bool ready_;
 186
 187  private:
 188   friend class theme_service_internal::ThemeServiceTest;
 189
 190   // Called when the extension service is ready.
 191   void OnExtensionServiceReady();
 192
 193   // Migrate the theme to the new theme pack schema by recreating the data pack
 194   // from the extension.
 195   void MigrateTheme();
 196
 197   // Replaces the current theme supplier with a new one and calls
 198   // StopUsingTheme() or StartUsingTheme() as appropriate.
 199   void SwapThemeSupplier(scoped_refptr<CustomThemeSupplier> theme_supplier);
 200
 201   // Saves the filename of the cached theme pack.
 202   void SavePackName(const base::FilePath& pack_path);
 203
 204   // Save the id of the last theme installed.
 205   void SaveThemeID(const std::string& id);
 206
 207   // Implementation of SetTheme() (and the fallback from LoadThemePrefs() in
 208   // case we don't have a theme pack).
 209   void BuildFromExtension(const extensions::Extension* extension);
 210
 211 #if defined(ENABLE_MANAGED_USERS)
 212   // Returns true if the profile belongs to a supervised user.
 213   bool IsSupervisedUser() const;
 214
 215   // Sets the current theme to the supervised user theme. Should only be used
 216   // for supervised user profiles.
 217   void SetSupervisedUserTheme();
 218 #endif
 219
 220 #if defined(OS_MACOSX)
 221   // |nsimage_cache_| retains the images it has cached.
 222   typedef std::map<int, NSImage*> NSImageMap;
 223   mutable NSImageMap nsimage_cache_;
 224
 225   // |nscolor_cache_| retains the colors it has cached.
 226   typedef std::map<int, NSColor*> NSColorMap;
 227   mutable NSColorMap nscolor_cache_;
 228
 229   typedef std::map<int, NSGradient*> NSGradientMap;
 230   mutable NSGradientMap nsgradient_cache_;
 231 #endif
 232
 233   ui::ResourceBundle& rb_;
 234   Profile* profile_;
 235
 236   scoped_refptr<CustomThemeSupplier> theme_supplier_;
 237
 238   // The id of the theme extension which has just been installed but has not
 239   // been loaded yet. The theme extension with |installed_pending_load_id_| may
 240   // never be loaded if the install is due to updating a disabled theme.
 241   // |pending_install_id_| should be set to |kDefaultThemeID| if there are no
 242   // recently installed theme extensions
 243   std::string installed_pending_load_id_;
 244
 245   // The number of infobars currently displayed.
 246   int number_of_infobars_;
 247
 248   content::NotificationRegistrar registrar_;
 249
 250   scoped_ptr<ThemeSyncableService> theme_syncable_service_;
 251
 252   base::WeakPtrFactory<ThemeService> weak_ptr_factory_;
 253
 254   DISALLOW_COPY_AND_ASSIGN(ThemeService);
 255 };
 256
 257 #endif  // CHROME_BROWSER_THEMES_THEME_SERVICE_H_