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      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 #include "chrome/browser/chromeos/extensions/input_method_api.h"
      6 
      7 #include "base/lazy_instance.h"
      8 #include "base/values.h"
      9 #include "chrome/browser/chromeos/extensions/input_method_event_router.h"
     10 #include "chrome/browser/extensions/api/input_ime/input_ime_api.h"
     11 #include "chrome/browser/extensions/event_names.h"
     12 #include "chrome/browser/extensions/extension_function_registry.h"
     13 #include "chrome/browser/extensions/extension_system.h"
     14 #include "chrome/browser/profiles/profile.h"
     15 #include "chromeos/ime/input_method_manager.h"
     16 
     17 namespace {
     18 
     19 // Prefix, which is used by XKB.
     20 const char kXkbPrefix[] = "xkb:";
     21 
     22 }  // namespace
     23 
     24 namespace extensions {
     25 
     26 GetInputMethodFunction::GetInputMethodFunction() {
     27 }
     28 
     29 GetInputMethodFunction::~GetInputMethodFunction() {
     30 }
     31 
     32 bool GetInputMethodFunction::RunImpl() {
     33 #if !defined(OS_CHROMEOS)
     34   NOTREACHED();
     35   return false;
     36 #else
     37   chromeos::input_method::InputMethodManager* manager =
     38       chromeos::input_method::InputMethodManager::Get();
     39   const std::string input_method = InputMethodAPI::GetInputMethodForXkb(
     40       manager->GetCurrentInputMethod().id());
     41   SetResult(Value::CreateStringValue(input_method));
     42   return true;
     43 #endif
     44 }
     45 
     46 StartImeFunction::StartImeFunction() {
     47 }
     48 
     49 StartImeFunction::~StartImeFunction() {
     50 }
     51 
     52 bool StartImeFunction::RunImpl() {
     53 #if !defined(OS_CHROMEOS)
     54   NOTREACHED();
     55   return false;
     56 #else
     57   chromeos::InputMethodEngine* engine =
     58       InputImeEventRouter::GetInstance()->GetActiveEngine(extension_id());
     59   if (engine)
     60     engine->StartIme();
     61   return true;
     62 #endif
     63 }
     64 
     65 InputMethodAPI::InputMethodAPI(Profile* profile)
     66     : profile_(profile) {
     67   ExtensionSystem::Get(profile_)->event_router()->RegisterObserver(
     68       this, event_names::kOnInputMethodChanged);
     69   ExtensionFunctionRegistry* registry =
     70       ExtensionFunctionRegistry::GetInstance();
     71   registry->RegisterFunction<GetInputMethodFunction>();
     72   registry->RegisterFunction<StartImeFunction>();
     73 }
     74 
     75 InputMethodAPI::~InputMethodAPI() {
     76 }
     77 
     78 // static
     79 std::string InputMethodAPI::GetInputMethodForXkb(const std::string& xkb_id) {
     80   size_t prefix_length = std::string(kXkbPrefix).length();
     81   DCHECK(xkb_id.substr(0, prefix_length) == kXkbPrefix);
     82   return xkb_id.substr(prefix_length);
     83 }
     84 
     85 void InputMethodAPI::Shutdown() {
     86   // UnregisterObserver may have already been called in OnListenerAdded,
     87   // but it is safe to call it more than once.
     88   ExtensionSystem::Get(profile_)->event_router()->UnregisterObserver(this);
     89 }
     90 
     91 void InputMethodAPI::OnListenerAdded(
     92     const extensions::EventListenerInfo& details) {
     93   DCHECK(!input_method_event_router_.get());
     94   input_method_event_router_.reset(
     95       new chromeos::ExtensionInputMethodEventRouter());
     96   ExtensionSystem::Get(profile_)->event_router()->UnregisterObserver(this);
     97 }
     98 
     99 static base::LazyInstance<ProfileKeyedAPIFactory<InputMethodAPI> >
    100     g_factory = LAZY_INSTANCE_INITIALIZER;
    101 
    102 // static
    103 ProfileKeyedAPIFactory<InputMethodAPI>* InputMethodAPI::GetFactoryInstance() {
    104   return &g_factory.Get();
    105 }
    106 
    107 }  // namespace extensions
    108