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// Copyright (c) 2009 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_BROWSER_CHROMEOS_LANGUAGE_LIBRARY_H_
#define CHROME_BROWSER_CHROMEOS_LANGUAGE_LIBRARY_H_
#include <string>
#include "base/observer_list.h"
#include "base/singleton.h"
#include "base/time.h"
#include "third_party/cros/chromeos_language.h"
namespace chromeos {
// This class handles the interaction with the ChromeOS language library APIs.
// Classes can add themselves as observers. Users can get an instance of this
// library class like this: LanguageLibrary::Get()
class LanguageLibrary {
public:
class Observer {
public:
virtual ~Observer() = 0;
virtual void LanguageChanged(LanguageLibrary* obj) = 0;
};
// This gets the singleton LanguageLibrary
static LanguageLibrary* Get();
// Makes sure the library is loaded, loading it if necessary. Returns true if
// the library has been successfully loaded.
static bool EnsureLoaded();
void AddObserver(Observer* observer);
void RemoveObserver(Observer* observer);
// Returns the list of IMEs and keyboard layouts we can select. If the cros
// library is not found or IBus/DBus daemon is not alive, this function
// returns a fallback language list (and never returns NULL).
InputLanguageList* GetLanguages();
// Changes the current IME engine to |id| and enable IME (when |category|
// is LANGUAGE_CATEGORY_IME). Changes the current XKB layout to |id| and
// disable IME (when |category| is LANGUAGE_CATEGORY_XKB). |id| is a unique
// identifier of a IME engine or XKB layout. Please check chromeos_language.h
// in src third_party/cros/ for details.
void ChangeLanguage(LanguageCategory category, const std::string& id);
const InputLanguage& current_language() const {
return current_language_;
}
private:
friend struct DefaultSingletonTraits<LanguageLibrary>;
LanguageLibrary();
~LanguageLibrary();
// This method is called when there's a change in language status.
// This method is called on a background thread.
static void LanguageChangedHandler(
void* object, const InputLanguage& current_language);
// This methods starts the monitoring of language changes.
void Init();
// Called by the handler to update the language status.
// This will notify all the Observers.
void UpdateCurrentLanguage(const InputLanguage& current_language);
// A reference to the language api, to allow callbacks when the language
// status changes.
LanguageStatusConnection* language_status_connection_;
ObserverList<Observer> observers_;
// The language (IME or XKB layout) which currently selected.
InputLanguage current_language_;
DISALLOW_COPY_AND_ASSIGN(LanguageLibrary);
};
} // namespace chromeos
#endif // CHROME_BROWSER_CHROMEOS_LANGUAGE_LIBRARY_H_
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