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_UI_WEBUI_HELP_HELP_HANDLER_H_
6#define CHROME_BROWSER_UI_WEBUI_HELP_HELP_HANDLER_H_
7
8#include <string>
9
10#include "base/compiler_specific.h"
11#include "base/memory/weak_ptr.h"
12#include "chrome/browser/ui/webui/help/version_updater.h"
13#include "content/public/browser/notification_observer.h"
14#include "content/public/browser/notification_registrar.h"
15#include "content/public/browser/web_ui_message_handler.h"
16
17#if defined(OS_CHROMEOS)
18#include "chrome/browser/chromeos/version_loader.h"
19#endif  // defined(OS_CHROMEOS)
20
21namespace content {
22class WebUIDataSource;
23}
24
25// WebUI message handler for the help page.
26class HelpHandler : public content::WebUIMessageHandler,
27                    public content::NotificationObserver {
28 public:
29  HelpHandler();
30  virtual ~HelpHandler();
31
32  // WebUIMessageHandler implementation.
33  virtual void RegisterMessages() OVERRIDE;
34
35  // Fills |source| with string values for the UI.
36  void GetLocalizedValues(content::WebUIDataSource* source);
37
38  // NotificationObserver implementation.
39  virtual void Observe(int type, const content::NotificationSource& source,
40                       const content::NotificationDetails& details) OVERRIDE;
41
42 private:
43  // Initializes querying values for the page.
44  void OnPageLoaded(const base::ListValue* args);
45
46#if defined(OS_MACOSX)
47  // Promotes the updater for all users.
48  void PromoteUpdater(const base::ListValue* args);
49#endif
50
51  // Relaunches the browser. |args| must be empty.
52  void RelaunchNow(const base::ListValue* args);
53
54  // Opens the feedback dialog. |args| must be empty.
55  void OpenFeedbackDialog(const base::ListValue* args);
56
57  // Opens the help page. |args| must be empty.
58  void OpenHelpPage(const base::ListValue* args);
59
60#if defined(OS_CHROMEOS)
61  // Sets the release track version.
62  void SetChannel(const base::ListValue* args);
63
64  // Performs relaunch and powerwash.
65  void RelaunchAndPowerwash(const base::ListValue* args);
66#endif
67
68  // Callback method which forwards status updates to the page.
69  void SetUpdateStatus(VersionUpdater::Status status, int progress,
70                       const base::string16& fail_message);
71
72#if defined(OS_MACOSX)
73  // Callback method which forwards promotion state to the page.
74  void SetPromotionState(VersionUpdater::PromotionState state);
75#endif
76
77#if defined(OS_CHROMEOS)
78  // Callbacks from VersionLoader.
79  void OnOSVersion(const std::string& version);
80  void OnOSFirmware(const std::string& firmware);
81  void OnCurrentChannel(const std::string& channel);
82  void OnTargetChannel(const std::string& channel);
83#endif
84
85  // Specialized instance of the VersionUpdater used to update the browser.
86  scoped_ptr<VersionUpdater> version_updater_;
87
88  // Used to observe notifications.
89  content::NotificationRegistrar registrar_;
90
91#if defined(OS_CHROMEOS)
92  // Handles asynchronously loading the CrOS version info.
93  chromeos::VersionLoader loader_;
94
95  // Used to request the version.
96  base::CancelableTaskTracker tracker_;
97#endif  // defined(OS_CHROMEOS)
98
99  // Used for callbacks.
100  base::WeakPtrFactory<HelpHandler> weak_factory_;
101
102  DISALLOW_COPY_AND_ASSIGN(HelpHandler);
103};
104
105#endif  // CHROME_BROWSER_UI_WEBUI_HELP_HELP_HANDLER_H_
106