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// Copyright (c) 2012 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.
#include "chrome/browser/chromeos/input_method/input_method_persistence.h"
#include "base/logging.h"
#include "base/prefs/pref_service.h"
#include "base/prefs/scoped_user_pref_update.h"
#include "base/sys_info.h"
#include "chrome/browser/browser_process.h"
#include "chrome/browser/chromeos/input_method/input_method_util.h"
#include "chrome/browser/chromeos/language_preferences.h"
#include "chrome/browser/chromeos/login/users/user_manager.h"
#include "chrome/browser/profiles/profile.h"
#include "chrome/browser/profiles/profile_manager.h"
#include "chrome/common/pref_names.h"
namespace chromeos {
namespace input_method {
namespace {
void PersistSystemInputMethod(const std::string& input_method) {
if (!g_browser_process || !g_browser_process->local_state())
return;
g_browser_process->local_state()->SetString(
language_prefs::kPreferredKeyboardLayout, input_method);
}
// Update user LRU keyboard layout for login screen
static void SetUserLRUInputMethod(
const std::string& input_method,
const chromeos::input_method::InputMethodManager* const manager,
Profile* profile) {
// Skip if it's not a keyboard layout. Drop input methods including
// extension ones.
if (!manager->IsLoginKeyboard(input_method))
return;
PrefService* const local_state = g_browser_process->local_state();
if (profile == NULL)
return;
const std::string username = profile->GetProfileName();
if (base::SysInfo::IsRunningOnChromeOS() && !username.empty() &&
!local_state->ReadOnly()) {
bool update_succeed = false;
{
// Updater may have side-effects, therefore we do not replace
// entry while updater exists.
DictionaryPrefUpdate updater(local_state, prefs::kUsersLRUInputMethod);
base::DictionaryValue* const users_lru_input_methods = updater.Get();
if (users_lru_input_methods) {
users_lru_input_methods->SetStringWithoutPathExpansion(username,
input_method);
update_succeed = true;
}
}
if (!update_succeed) {
// Somehow key kUsersLRUInputMethod has value of invalid type.
// Replace and retry.
local_state->Set(prefs::kUsersLRUInputMethod, base::DictionaryValue());
DictionaryPrefUpdate updater(local_state, prefs::kUsersLRUInputMethod);
base::DictionaryValue* const users_lru_input_methods = updater.Get();
if (users_lru_input_methods) {
users_lru_input_methods->SetStringWithoutPathExpansion(username,
input_method);
update_succeed = true;
}
}
if (!update_succeed) {
DVLOG(1) << "Failed to replace local_state.kUsersLRUInputMethod: '"
<< prefs::kUsersLRUInputMethod << "' for '" << username << "'";
}
}
}
void PersistUserInputMethod(const std::string& input_method,
InputMethodManager* const manager) {
PrefService* user_prefs = NULL;
// Persist the method on a per user basis. Note that the keyboard settings are
// stored per user desktop and a visiting window will use the same input
// method as the desktop it is on (and not of the owner of the window).
Profile* profile = ProfileManager::GetActiveUserProfile();
if (profile)
user_prefs = profile->GetPrefs();
if (!user_prefs)
return;
SetUserLRUInputMethod(input_method, manager, profile);
const std::string current_input_method_on_pref =
user_prefs->GetString(prefs::kLanguageCurrentInputMethod);
if (current_input_method_on_pref == input_method)
return;
user_prefs->SetString(prefs::kLanguagePreviousInputMethod,
current_input_method_on_pref);
user_prefs->SetString(prefs::kLanguageCurrentInputMethod,
input_method);
}
} // namespace
InputMethodPersistence::InputMethodPersistence(
InputMethodManager* input_method_manager)
: input_method_manager_(input_method_manager),
state_(InputMethodManager::STATE_LOGIN_SCREEN) {
input_method_manager_->AddObserver(this);
}
InputMethodPersistence::~InputMethodPersistence() {
input_method_manager_->RemoveObserver(this);
}
void InputMethodPersistence::InputMethodChanged(
InputMethodManager* manager, bool show_message) {
DCHECK_EQ(input_method_manager_, manager);
const std::string current_input_method =
manager->GetCurrentInputMethod().id();
// Save the new input method id depending on the current browser state.
switch (state_) {
case InputMethodManager::STATE_LOGIN_SCREEN:
if (!manager->IsLoginKeyboard(current_input_method)) {
DVLOG(1) << "Only keyboard layouts are supported: "
<< current_input_method;
return;
}
PersistSystemInputMethod(current_input_method);
return;
case InputMethodManager::STATE_BROWSER_SCREEN:
PersistUserInputMethod(current_input_method, manager);
return;
case InputMethodManager::STATE_LOCK_SCREEN:
// We use a special set of input methods on the screen. Do not update.
return;
case InputMethodManager::STATE_TERMINATING:
return;
}
NOTREACHED();
}
void InputMethodPersistence::OnSessionStateChange(
InputMethodManager::State new_state) {
state_ = new_state;
}
} // namespace input_method
} // namespace chromeos
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