chrome/browser/ui/webui/help/help_handler.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_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 "base/strings/string16.h"
  13 #include "chrome/browser/ui/webui/help/version_updater.h"
  14 #include "content/public/browser/notification_observer.h"
  15 #include "content/public/browser/notification_registrar.h"
  16 #include "content/public/browser/web_ui_message_handler.h"
  17
  18 #if defined(OS_CHROMEOS)
  19 #include "base/task/cancelable_task_tracker.h"
  20 #include "chromeos/system/version_loader.h"
  21 #endif  // defined(OS_CHROMEOS)
  22
  23 namespace base {
  24 class DictionaryValue;
  25 class ListValue;
  26 }
  27
  28 // WebUI message handler for the help page.
  29 class HelpHandler : public content::WebUIMessageHandler,
  30                     public content::NotificationObserver {
  31  public:
  32   HelpHandler();
  33   ~HelpHandler() override;
  34
  35   // WebUIMessageHandler implementation.
  36   void RegisterMessages() override;
  37
  38   // Adds string values for the UI to |localized_strings|.
  39   static void GetLocalizedValues(base::DictionaryValue* localized_strings);
  40
  41   // NotificationObserver implementation.
  42   void Observe(int type,
  43                const content::NotificationSource& source,
  44                const content::NotificationDetails& details) override;
  45
  46   // Returns the browser version as a string.
  47   static base::string16 BuildBrowserVersionString();
  48
  49  private:
  50   // Initializes querying values for the page.
  51   void OnPageLoaded(const base::ListValue* args);
  52
  53 #if defined(OS_MACOSX)
  54   // Promotes the updater for all users.
  55   void PromoteUpdater(const base::ListValue* args);
  56 #endif
  57
  58   // Relaunches the browser. |args| must be empty.
  59   void RelaunchNow(const base::ListValue* args);
  60
  61   // Opens the feedback dialog. |args| must be empty.
  62   void OpenFeedbackDialog(const base::ListValue* args);
  63
  64   // Opens the help page. |args| must be empty.
  65   void OpenHelpPage(const base::ListValue* args);
  66
  67 #if defined(OS_CHROMEOS)
  68   // Sets the release track version.
  69   void SetChannel(const base::ListValue* args);
  70
  71   // Performs relaunch and powerwash.
  72   void RelaunchAndPowerwash(const base::ListValue* args);
  73 #endif
  74
  75   // Checks for and applies update.
  76   void RequestUpdate(const base::ListValue* args);
  77
  78   // Callback method which forwards status updates to the page.
  79   void SetUpdateStatus(VersionUpdater::Status status, int progress,
  80                        const base::string16& fail_message);
  81
  82 #if defined(OS_MACOSX)
  83   // Callback method which forwards promotion state to the page.
  84   void SetPromotionState(VersionUpdater::PromotionState state);
  85 #endif
  86
  87 #if defined(OS_CHROMEOS)
  88   // Callbacks from VersionLoader.
  89   void OnOSVersion(const std::string& version);
  90   void OnOSFirmware(const std::string& firmware);
  91   void OnCurrentChannel(const std::string& channel);
  92   void OnTargetChannel(const std::string& channel);
  93
  94   // Callback for setting the FCC label alt text.
  95   void OnFCCLabelTextRead(const std::string& text);
  96 #endif
  97
  98   // Specialized instance of the VersionUpdater used to update the browser.
  99   scoped_ptr<VersionUpdater> version_updater_;
 100
 101   // Used to observe notifications.
 102   content::NotificationRegistrar registrar_;
 103
 104   // Used for callbacks.
 105   base::WeakPtrFactory<HelpHandler> weak_factory_;
 106
 107   DISALLOW_COPY_AND_ASSIGN(HelpHandler);
 108 };
 109
 110 #endif  // CHROME_BROWSER_UI_WEBUI_HELP_HELP_HANDLER_H_