chrome/browser/chromeos/input_method/browser_state_monitor.h

   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 #ifndef CHROME_BROWSER_CHROMEOS_INPUT_METHOD_BROWSER_STATE_MONITOR_H_
   6 #define CHROME_BROWSER_CHROMEOS_INPUT_METHOD_BROWSER_STATE_MONITOR_H_
   7
   8 #include <string>
   9
  10 #include "base/basictypes.h"
  11 #include "base/callback.h"
  12 #include "base/compiler_specific.h"
  13 #include "chromeos/ime/input_method_manager.h"
  14 #include "content/public/browser/notification_observer.h"
  15 #include "content/public/browser/notification_registrar.h"
  16
  17 namespace chromeos {
  18 namespace input_method {
  19
  20 // Translates notifications from the browser (not logged in, logged in, etc.),
  21 // into InputMethodManager::State transitions.
  22 class BrowserStateMonitor : public content::NotificationObserver {
  23  public:
  24   // Constructs a monitor that will invoke the given observer callback whenever
  25   // the InputMethodManager::State changes. Assumes that the current state is
  26   // STATE_LOGIN_SCREEN. |observer| may be null.
  27   explicit BrowserStateMonitor(
  28       const base::Callback<void(InputMethodManager::State)>& observer);
  29   virtual ~BrowserStateMonitor();
  30
  31   InputMethodManager::State state() const { return state_; }
  32
  33   // content::NotificationObserver overrides:
  34   virtual void Observe(int type,
  35                        const content::NotificationSource& source,
  36                        const content::NotificationDetails& details) OVERRIDE;
  37
  38  private:
  39   base::Callback<void(InputMethodManager::State)> observer_;
  40   InputMethodManager::State state_;
  41   content::NotificationRegistrar notification_registrar_;
  42
  43   DISALLOW_COPY_AND_ASSIGN(BrowserStateMonitor);
  44 };
  45
  46 }  // namespace input_method
  47 }  // namespace chromeos
  48
  49 #endif  // CHROME_BROWSER_CHROMEOS_INPUT_METHOD_BROWSER_STATE_MONITOR_H_