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_EVENTS_SYSTEM_KEY_EVENT_LISTENER_H_
6#define CHROME_BROWSER_CHROMEOS_EVENTS_SYSTEM_KEY_EVENT_LISTENER_H_
7
8#include "base/memory/singleton.h"
9#include "ui/events/platform/platform_event_observer.h"
10
11typedef union _XEvent XEvent;
12
13namespace chromeos {
14
15class SystemKeyEventListener : public ui::PlatformEventObserver {
16 public:
17  static void Initialize();
18  static void Shutdown();
19  // GetInstance returns NULL if not initialized or if already shutdown.
20  static SystemKeyEventListener* GetInstance();
21
22  void Stop();
23
24 private:
25  // Defines the delete on exit Singleton traits we like.  Best to have this
26  // and const/dest private as recommended for Singletons.
27  friend struct DefaultSingletonTraits<SystemKeyEventListener>;
28  friend class SystemKeyEventListenerTest;
29
30  SystemKeyEventListener();
31  virtual ~SystemKeyEventListener();
32
33  // ui::PlatformEventObserver:
34  virtual void WillProcessEvent(const ui::PlatformEvent& event) OVERRIDE;
35  virtual void DidProcessEvent(const ui::PlatformEvent& event) OVERRIDE;
36
37  void ProcessedXEvent(XEvent* xevent);
38
39  bool stopped_;
40
41  // Base X ID for events from the XKB extension.
42  int xkb_event_base_;
43
44  DISALLOW_COPY_AND_ASSIGN(SystemKeyEventListener);
45};
46
47}  // namespace chromeos
48
49#endif  // CHROME_BROWSER_CHROMEOS_EVENTS_SYSTEM_KEY_EVENT_LISTENER_H_
50