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| 1 // Copyright (c) 2009 The Chromium OS 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 #include "chromeos_language.h" |
| 6 |
| 7 #include <base/logging.h> |
| 8 #include <ibus.h> |
| 9 |
| 10 #include <algorithm> // for std::sort. |
| 11 |
| 12 #include "chromeos/dbus/dbus.h" |
| 13 #include "chromeos/glib/object.h" |
| 14 |
| 15 namespace { |
| 16 |
| 17 const char kCandidateWindowService[] = "org.freedesktop.IBus.Panel"; |
| 18 const char kCandidateWindowObjectPath[] = "/org/chromium/Chrome/LanguageBar"; |
| 19 const char kCandidateWindowInterface[] = "org.freedesktop.IBus.Panel"; |
| 20 |
| 21 // Copies IME names in |engines| to |out|. |
| 22 void AddIMELanguages(const GList* engines, chromeos::InputLanguageList* out) { |
| 23 DCHECK(out); |
| 24 for (; engines; engines = g_list_next(engines)) { |
| 25 IBusEngineDesc *engine_desc = IBUS_ENGINE_DESC(engines->data); |
| 26 out->push_back(chromeos::InputLanguage( |
| 27 chromeos::LANGUAGE_CATEGORY_IME, |
| 28 engine_desc->name, engine_desc->longname, engine_desc->icon)); |
| 29 g_object_unref(engine_desc); |
| 30 } |
| 31 } |
| 32 |
| 33 // Copies XKB layout names in (TBD) to |out|. |
| 34 void AddXKBLayouts(chromeos::InputLanguageList* out) { |
| 35 DCHECK(out); |
| 36 // TODO(yusukes): implement this. |
| 37 out->push_back(chromeos::InputLanguage( |
| 38 chromeos::LANGUAGE_CATEGORY_XKB, |
| 39 kFallbackXKBId, |
| 40 kFallbackXKBDisplayName, |
| 41 "" /* no icon */)); // mock |
| 42 } |
| 43 |
| 44 } // namespace |
| 45 |
| 46 namespace chromeos { |
| 47 |
| 48 // A class that holds IBus and DBus connections. |
| 49 class LanguageStatusConnection { |
| 50 public: |
| 51 LanguageStatusConnection(LanguageStatusMonitorFunction monitor_function, |
| 52 void* language_library) |
| 53 : monitor_function_(monitor_function), |
| 54 language_library_(language_library), |
| 55 ibus_(NULL), |
| 56 dbus_focus_in_(NULL), |
| 57 dbus_focus_out_(NULL), |
| 58 dbus_state_changed_(NULL), |
| 59 input_context_path_("") { |
| 60 DCHECK(monitor_function_); |
| 61 DCHECK(language_library_); |
| 62 } |
| 63 |
| 64 ~LanguageStatusConnection() { |
| 65 // Close IBus and DBus connections. |
| 66 if (ibus_) { |
| 67 g_object_unref(ibus_); |
| 68 } |
| 69 if (dbus_focus_in_) { |
| 70 dbus::Disconnect(dbus_focus_in_); |
| 71 } |
| 72 if (dbus_focus_out_) { |
| 73 dbus::Disconnect(dbus_focus_out_); |
| 74 } |
| 75 if (dbus_state_changed_) { |
| 76 dbus::Disconnect(dbus_state_changed_); |
| 77 } |
| 78 } |
| 79 |
| 80 // Initializes IBus and DBus connections. |
| 81 bool Init() { |
| 82 // Establish IBus connection between ibus-daemon to retrieve the list of |
| 83 // available IME engines, change the current IME engine, and so on. |
| 84 ibus_init(); |
| 85 ibus_ = ibus_bus_new(); |
| 86 |
| 87 // Check the IBus connection status. |
| 88 if (!ibus_) { |
| 89 LOG(ERROR) << "ibus_bus_new() failed"; |
| 90 return false; |
| 91 } |
| 92 if (!ibus_bus_is_connected(ibus_)) { |
| 93 LOG(ERROR) << "ibus_bus_is_connected() failed"; |
| 94 return false; |
| 95 } |
| 96 |
| 97 // Establish a DBus connection between the candidate_window process for |
| 98 // Chromium OS to handle "FocusIn", "FocusOut", and "StateChanged" signals |
| 99 // from the process. |
| 100 const char* address = ibus_get_address(); |
| 101 dbus::BusConnection dbus(dbus::GetPrivateBusConnection(address)); |
| 102 LOG(INFO) << "Established private D-Bus connection to: '" << address << "'"; |
| 103 |
| 104 const bool kConnectToNameOwner = true; |
| 105 // TODO(yusukes): dbus::Proxy instantiation might fail (and abort due to |
| 106 // DCHECK failure) when candidate_window process does not exist yet. |
| 107 // Would be better to add "bool dbus::Proxy::Init()" or something like that |
| 108 // to handle such case? |
| 109 dbus::Proxy candidate_window(dbus, |
| 110 kCandidateWindowService, |
| 111 kCandidateWindowObjectPath, |
| 112 kCandidateWindowInterface, |
| 113 kConnectToNameOwner); |
| 114 |
| 115 if (!candidate_window) { |
| 116 LOG(ERROR) << "Can't construct proxy for the candidate window. " |
| 117 << "candidate window is not running?"; |
| 118 return false; |
| 119 } |
| 120 |
| 121 dbus_focus_in_ = dbus::Monitor(candidate_window, |
| 122 "FocusIn", |
| 123 &LanguageStatusConnection::FocusIn, |
| 124 this); |
| 125 dbus_focus_out_ = dbus::Monitor(candidate_window, |
| 126 "FocusOut", |
| 127 &LanguageStatusConnection::FocusOut, |
| 128 this); |
| 129 dbus_state_changed_ = dbus::Monitor(candidate_window, |
| 130 "StateChanged", |
| 131 &LanguageStatusConnection::StateChanged, |
| 132 this); |
| 133 |
| 134 // TODO(yusukes): Investigate what happens if IBus/DBus connections are |
| 135 // suddenly closed. |
| 136 // TODO(yusukes): Investigate what happens if candidate_window process is |
| 137 // restarted. I'm not sure but we should use dbus_g_proxy_new_for_name(), |
| 138 // not dbus_g_proxy_new_for_name_owner()? |
| 139 |
| 140 return true; |
| 141 } |
| 142 |
| 143 // Called by cros API ChromeOSGetLanguages() and returns a list of IMEs and |
| 144 // XKB layouts that are currently available. |
| 145 InputLanguageList* GetLanguages() { |
| 146 GList* engines = ibus_bus_list_active_engines(ibus_); |
| 147 if (!engines) { |
| 148 // IBus connection is broken? |
| 149 LOG(ERROR) << "ibus_bus_list_active_engines() failed."; |
| 150 return NULL; |
| 151 } |
| 152 InputLanguageList* language_list = new InputLanguageList; |
| 153 AddIMELanguages(engines, language_list); |
| 154 AddXKBLayouts(language_list); |
| 155 std::sort(language_list->begin(), language_list->end()); |
| 156 |
| 157 g_list_free(engines); |
| 158 return language_list; |
| 159 } |
| 160 |
| 161 // Called by cros API ChromeOSChangeLanguage(). |
| 162 void SwitchXKB(const char* name) { |
| 163 IBusInputContext* context |
| 164 = ibus_input_context_get_input_context(input_context_path_.c_str(), |
| 165 ibus_bus_get_connection(ibus_)); |
| 166 ibus_input_context_disable(context); |
| 167 g_object_unref(context); |
| 168 // TODO(yusukes): implement XKB switching. |
| 169 UpdateUI(); |
| 170 } |
| 171 |
| 172 // Called by cros API ChromeOSChangeLanguage() as well. |
| 173 void SwitchIME(const char* name) { |
| 174 if (input_context_path_.empty()) { |
| 175 LOG(ERROR) << "Input context is unknown"; |
| 176 return; |
| 177 } |
| 178 |
| 179 IBusInputContext* context |
| 180 = ibus_input_context_get_input_context(input_context_path_.c_str(), |
| 181 ibus_bus_get_connection(ibus_)); |
| 182 ibus_input_context_set_engine(context, name); |
| 183 g_object_unref(context); |
| 184 UpdateUI(); |
| 185 } |
| 186 |
| 187 private: |
| 188 // Handles "FocusIn" signal from candidate_window. |
| 189 static void FocusIn(void* object, const char* input_context_path) { |
| 190 DCHECK(input_context_path) << "NULL context passed"; |
| 191 DLOG(INFO) << "FocusIn: " << input_context_path; |
| 192 DCHECK(object); |
| 193 |
| 194 // Remember the current ic path. |
| 195 LanguageStatusConnection* self |
| 196 = static_cast<LanguageStatusConnection*>(object); |
| 197 self->input_context_path_ = input_context_path; |
| 198 self->UpdateUI(); // This is necessary since IME status is held per ic. |
| 199 } |
| 200 |
| 201 // Handles "FocusOut" signal from candidate_window. |
| 202 static void FocusOut(void* object, const char* input_context_path) { |
| 203 DCHECK(input_context_path) << "NULL context passed"; |
| 204 DLOG(INFO) << "FocusOut: " << input_context_path; |
| 205 DCHECK(object); |
| 206 } |
| 207 |
| 208 // Handles "StateChanged" signal from candidate_window process. |
| 209 static void StateChanged(void* object, const char* dummy) { |
| 210 // TODO(yusukes): Modify common/chromeos/dbus/dbus.h so that we can handle |
| 211 // signals without argument. Then remove the |dummy|. |
| 212 DLOG(INFO) << "StateChanged"; |
| 213 DCHECK(object); |
| 214 LanguageStatusConnection* self |
| 215 = static_cast<LanguageStatusConnection*>(object); |
| 216 self->UpdateUI(); |
| 217 } |
| 218 |
| 219 // Retrieve IME/XKB status and notify them to the UI. |
| 220 void UpdateUI() { |
| 221 if (input_context_path_.empty()) { |
| 222 LOG(ERROR) << "Input context is unknown"; |
| 223 return; |
| 224 } |
| 225 |
| 226 IBusInputContext* context |
| 227 = ibus_input_context_get_input_context( |
| 228 input_context_path_.c_str(), ibus_bus_get_connection(ibus_)); |
| 229 |
| 230 InputLanguage current_language; |
| 231 const bool ime_is_enabled = ibus_input_context_is_enabled(context); |
| 232 if (ime_is_enabled) { |
| 233 DLOG(INFO) << "IME is active"; |
| 234 // Set IME name on current_language. |
| 235 const IBusEngineDesc* engine_desc |
| 236 = ibus_input_context_get_engine(context); |
| 237 DCHECK(engine_desc); |
| 238 if (!engine_desc) { |
| 239 return; |
| 240 } |
| 241 current_language = InputLanguage(LANGUAGE_CATEGORY_IME, |
| 242 engine_desc->name, |
| 243 engine_desc->longname, |
| 244 engine_desc->icon); |
| 245 } else { |
| 246 DLOG(INFO) << "IME is not active"; |
| 247 // Set XKB layout name on current_languages. |
| 248 current_language = InputLanguage(LANGUAGE_CATEGORY_XKB, |
| 249 kFallbackXKBId, |
| 250 kFallbackXKBDisplayName, |
| 251 "" /* no icon */); // mock |
| 252 // TODO(yusukes): implemente this. |
| 253 } |
| 254 DLOG(INFO) << "Updating the UI. ID:" << current_language.id |
| 255 << ", display_name:" << current_language.display_name; |
| 256 |
| 257 // Notify the change to update UI. |
| 258 monitor_function_(language_library_, current_language); |
| 259 g_object_unref(context); |
| 260 } |
| 261 |
| 262 // A function pointer which points LanguageLibrary::LanguageChangedHandler |
| 263 // function. |monitor_funcion_| is called when Chrome UI needs to be updated. |
| 264 LanguageStatusMonitorFunction monitor_function_; |
| 265 // Points to a chromeos::LanguageLibrary object. |language_library_| is used |
| 266 // as the first argument of the |monitor_function_| function. |
| 267 void* language_library_; |
| 268 |
| 269 // Connections to IBus and DBus. |
| 270 typedef dbus::MonitorConnection<void (const char*)>* DBusConnectionType; |
| 271 IBusBus* ibus_; |
| 272 DBusConnectionType dbus_focus_in_; |
| 273 DBusConnectionType dbus_focus_out_; |
| 274 DBusConnectionType dbus_state_changed_; |
| 275 |
| 276 // Current input context path. |
| 277 std::string input_context_path_; |
| 278 }; |
| 279 |
| 280 // |
| 281 // cros APIs |
| 282 // |
| 283 |
| 284 // The function will be bound to chromeos::MonitorLanguageStatus with dlsym() |
| 285 // in load.cc so it needs to be in the C linkage, so the symbol name does not |
| 286 // get mangled. |
| 287 extern "C" |
| 288 LanguageStatusConnection* ChromeOSMonitorLanguageStatus( |
| 289 LanguageStatusMonitorFunction monitor_function, void* language_library) { |
| 290 LOG(INFO) << "MonitorLanguageStatus"; |
| 291 LanguageStatusConnection* connection |
| 292 = new LanguageStatusConnection(monitor_function, language_library); |
| 293 if (!connection->Init()) { |
| 294 LOG(WARNING) << "Failed to Init() LanguageStatusConnection. " |
| 295 << "Returning NULL"; |
| 296 delete connection; |
| 297 connection = NULL; |
| 298 } |
| 299 return connection; |
| 300 } |
| 301 |
| 302 extern "C" |
| 303 void ChromeOSDisconnectLanguageStatus(LanguageStatusConnection* connection) { |
| 304 LOG(INFO) << "DisconnectLanguageStatus"; |
| 305 delete connection; |
| 306 } |
| 307 |
| 308 extern "C" |
| 309 InputLanguageList* ChromeOSGetLanguages(LanguageStatusConnection* connection) { |
| 310 // TODO(yusukes): Add DCHECK(connection); here when candidate_window for |
| 311 // Chrome OS gets ready. |
| 312 if (!connection) { |
| 313 LOG(WARNING) << "LanguageStatusConnection is NULL"; |
| 314 return NULL; |
| 315 } |
| 316 // Pass ownership to a caller. Note: GetLanguages() might return NULL. |
| 317 return connection->GetLanguages(); |
| 318 } |
| 319 |
| 320 extern "C" |
| 321 void ChromeOSChangeLanguage(LanguageStatusConnection* connection, |
| 322 LanguageCategory category, |
| 323 const char* name) { |
| 324 // TODO(yusukes): Add DCHECK(connection); here when candidate_window for |
| 325 // Chrome OS gets ready. |
| 326 if (!connection) { |
| 327 LOG(WARNING) << "LanguageStatusConnection is NULL"; |
| 328 return; |
| 329 } |
| 330 DCHECK(name); |
| 331 DLOG(INFO) << "ChangeLanguage: " << name << " [category " << category << "]"; |
| 332 switch (category) { |
| 333 case LANGUAGE_CATEGORY_XKB: |
| 334 connection->SwitchXKB(name); |
| 335 break; |
| 336 case LANGUAGE_CATEGORY_IME: |
| 337 connection->SwitchIME(name); |
| 338 break; |
| 339 } |
| 340 } |
| 341 |
| 342 } // namespace chromeos |
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