Update IME preferences outside the IME status button when Uber Tray is in use.

chrome/browser/chromeos/input_method/browser_state_monitor.h

+// 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.
+
+#ifndef CHROME_BROWSER_CHROMEOS_INPUT_METHOD_BROWSER_STATE_MONITOR_H_
+#define CHROME_BROWSER_CHROMEOS_INPUT_METHOD_BROWSER_STATE_MONITOR_H_
+#pragma once
+
+#include <string>
+
+#include "chrome/browser/chromeos/input_method/input_method_manager.h"
+#include "chrome/browser/prefs/pref_member.h"
+#include "content/public/browser/notification_observer.h"
+#include "content/public/browser/notification_registrar.h"
+#include "content/public/browser/notification_types.h"
+
+namespace chromeos {
+namespace input_method {
+
+// A class which monitors a notification from the browser to keep track of the
+// browser state (not logged in, logged in, etc.) and notify the current state
+// to the input method manager. The class also updates the appropriate Chrome
+// prefs (~/Local\ State or ~/Preferences) depending on the current browser
+// state.
+class BrowserStateMonitor
+    : public content::NotificationObserver,
+      public input_method::InputMethodManager::PreferenceObserver {
+ public:
+  explicit BrowserStateMonitor(InputMethodManager* manager);
+  virtual ~BrowserStateMonitor();
+
+ protected:
+  // Updates ~/Local\ State file. protected: for testing.
+  virtual void UpdateLocalState(const std::string& current_input_method);
+  // Updates ~/Preferences file. protected: for testing.
+  virtual void UpdateUserPreferences(const std::string& current_input_method);
+
+ private:
+  // InputMethodManager::PreferenceObserver implementation.
+  // TODO(yusukes): On R20, use input_method::InputMethodManager::Observer and
+  // remove the PreferenceObserver interface from InputMethodManager.
+  virtual void PreferenceUpdateNeeded(
+      input_method::InputMethodManager* manager,
+      const input_method::InputMethodDescriptor& previous_input_method,
+      const input_method::InputMethodDescriptor& current_input_method) OVERRIDE;
+  virtual void FirstObserverIsAdded(
+      input_method::InputMethodManager* manager) OVERRIDE {}
+
+  // content::NotificationObserver overrides:
+  virtual void Observe(int type,
+                       const content::NotificationSource& source,
+                       const content::NotificationDetails& details) OVERRIDE;
+
+  void SetState(InputMethodManager::State new_state);
+  void InitializePrefMembers();
+
+  InputMethodManager* manager_;
+  InputMethodManager::State state_;
+
+  // Objects for updating the Chrome prefs.
+  StringPrefMember previous_input_method_pref_;
+  StringPrefMember current_input_method_pref_;
+  bool initialized_;
+
+  // This is used to register this object to some browser notifications.
+  content::NotificationRegistrar notification_registrar_;
+
+  DISALLOW_COPY_AND_ASSIGN(BrowserStateMonitor);
+};
+
+}  // namespace input_method
+}  // namespace chromeos
+
+#endif  // CHROME_BROWSER_CHROMEOS_INPUT_METHOD_BROWSER_STATE_MONITOR_H_