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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 "chromeos/ime/input_method_manager.h"
     15 
     16 namespace {
     17 
     18 // Prefix, which is used by XKB.
     19 const char kXkbPrefix[] = "xkb:";
     20 
     21 }  // namespace
     22 
     23 namespace extensions {
     24 
     25 GetInputMethodFunction::GetInputMethodFunction() {
     26 }
     27 
     28 GetInputMethodFunction::~GetInputMethodFunction() {
     29 }
     30 
     31 bool GetInputMethodFunction::RunImpl() {
     32 #if !defined(OS_CHROMEOS)
     33   NOTREACHED();
     34   return false;
     35 #else
     36   chromeos::input_method::InputMethodManager* manager =
     37       chromeos::input_method::InputMethodManager::Get();
     38   const std::string input_method = InputMethodAPI::GetInputMethodForXkb(
     39       manager->GetCurrentInputMethod().id());
     40   SetResult(Value::CreateStringValue(input_method));
     41   return true;
     42 #endif
     43 }
     44 
     45 StartImeFunction::StartImeFunction() {
     46 }
     47 
     48 StartImeFunction::~StartImeFunction() {
     49 }
     50 
     51 bool StartImeFunction::RunImpl() {
     52 #if !defined(OS_CHROMEOS)
     53   NOTREACHED();
     54   return false;
     55 #else
     56   chromeos::InputMethodEngineInterface* engine =
     57       InputImeEventRouter::GetInstance()->GetActiveEngine(extension_id());
     58   if (engine)
     59     engine->StartIme();
     60   return true;
     61 #endif
     62 }
     63 
     64 InputMethodAPI::InputMethodAPI(content::BrowserContext* context)
     65     : context_(context) {
     66   ExtensionSystem::GetForBrowserContext(context_)->event_router()->
     67       RegisterObserver(this, event_names::kOnInputMethodChanged);
     68   ExtensionFunctionRegistry* registry =
     69       ExtensionFunctionRegistry::GetInstance();
     70   registry->RegisterFunction<GetInputMethodFunction>();
     71   registry->RegisterFunction<StartImeFunction>();
     72 }
     73 
     74 InputMethodAPI::~InputMethodAPI() {
     75 }
     76 
     77 // static
     78 std::string InputMethodAPI::GetInputMethodForXkb(const std::string& xkb_id) {
     79   size_t prefix_length = std::string(kXkbPrefix).length();
     80   DCHECK(xkb_id.substr(0, prefix_length) == kXkbPrefix);
     81   return xkb_id.substr(prefix_length);
     82 }
     83 
     84 void InputMethodAPI::Shutdown() {
     85   // UnregisterObserver may have already been called in OnListenerAdded,
     86   // but it is safe to call it more than once.
     87   ExtensionSystem::GetForBrowserContext(context_)->event_router()->
     88       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(context_));
     96   ExtensionSystem::GetForBrowserContext(context_)->event_router()->
     97       UnregisterObserver(this);
     98 }
     99 
    100 static base::LazyInstance<ProfileKeyedAPIFactory<InputMethodAPI> >
    101     g_factory = LAZY_INSTANCE_INITIALIZER;
    102 
    103 // static
    104 ProfileKeyedAPIFactory<InputMethodAPI>* InputMethodAPI::GetFactoryInstance() {
    105   return &g_factory.Get();
    106 }
    107 
    108 }  // namespace extensions
    109