One way to add a default theme in chromium

First of all, chromium in addition to the default theme, the others are installed in Chrome extension, so for a new theme, you need to set a theme ID, the subject ID can be set one by oneself, as long as the length of the same, but the subject ID will have a letter range limit, So you can find a ready-made ID, and then directly exchange a few letters of the location, the subsequent ID will not really use.

Src\chrome\browser\themes\theme_service.ccconst char* Themeservice::kdefaultthemeid = ""; Const char* ThemeService:: Knewdefaultthemeid = "NDOIPPCJLIPFDDFFDCIMAKHEBAEMNMGN";

In theme_service_factory.cc, set the default registration theme ID to the new theme ID.

src\chrome\browser\themes\theme_service_factory.cc  registry->registerstringpref (      prefs:: Kcurrentthemeid,  Themeservice::knewdefaultthemeid,      user_prefs::P refregistrysyncable::unsyncable_pref);

After Chrome is launched, the Themeservice::init function is called, which goes into the loadthemeprefs function, but after entering Loadthemeprefs, the topic is not loaded, because the current Current_ The ID equals knewdefaultthemeid,kcurrentthemepackfilename is empty. Themeservice will listen to the notification_extensions_ready signal, when the extension system starts, call Themeservice Onextensionserviceready function, Next, you can load the theme through the extension system. In the Onextensionserviceready function, the current value of Ready_ is false because no topic is loaded. Call the Migratetheme function to change the function to

void Themeservice::migratetheme () {//TODO (ERG): We need to pops up a dialog informing the U  Ser, their//theme is being migrated.  extensionservice* service = Extensions::extensionsystem::get (Profile_)->extension_service ();      Const extension* Extension = service?  Service->getextensionbyid (Getthemeid (), false): NULL;    if (extension) {DLOG (ERROR) << "Migrating theme";    buildfromextension (extension);  Content::recordaction (Usermetricsaction ("themes.migrated")); } else {if (Getthemeid () = = Knewdefaultthemeid) {Base::filepath dir_exe; Pathservice::get (Base::D Ir_exe, &dir_exe); Base::filepath New_theme_dir (Dir_exe.value () + file_path_literal ("/ New_theme ")); extensions::unpackedinstaller::create (service)->load (New_theme_dir);}  else {DLOG (ERROR) << "Theme is mysteriously gone.";  Clearallthemedata ();    Content::recordaction (Usermetricsaction ("Themes.gone")); }  }}

Since the initial subject ID is Knewdefaultthemeid, you will need to load the topic extension from the given folder New_theme_dir. Migratetheme Run finished calling notifythemechanged, the topic loading is complete.


When you reset a theme, the Clearallthemedata function is called, which resets the theme ID and re-loads the topic.

void Themeservice::clearallthemedata () {  if (!ready_)    return;  Swapthemesupplier (NULL);  Freeplatformcaches ();  Profile_->getprefs ()->clearpref (prefs::kcurrentthemepackfilename);  Savethemeid (Knewdefaultthemeid);  Base::messageloop::current ()->posttask (From_here,  base::bind (&themeservice::removeunusedthemes,  Weak_ptr_factory_. Getweakptr (),  True));  Migratetheme ();}

One way to add a default theme in chromium