chrome/browser/ui/navigation_correction_tab_observer.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_NAVIGATION_CORRECTION_TAB_OBSERVER_H_
   6 #define CHROME_BROWSER_UI_NAVIGATION_CORRECTION_TAB_OBSERVER_H_
   7
   8 #include "base/prefs/pref_change_registrar.h"
   9 #include "content/public/browser/notification_observer.h"
  10 #include "content/public/browser/notification_registrar.h"
  11 #include "content/public/browser/web_contents_observer.h"
  12 #include "content/public/browser/web_contents_user_data.h"
  13
  14 class Profile;
  15
  16 namespace user_prefs {
  17 class PrefRegistrySyncable;
  18 }
  19
  20 // Per-tab class to implement navigation suggestion service functionality.
  21 class NavigationCorrectionTabObserver
  22     : public content::WebContentsObserver,
  23       public content::NotificationObserver,
  24       public content::WebContentsUserData<NavigationCorrectionTabObserver> {
  25  public:
  26   virtual ~NavigationCorrectionTabObserver();
  27
  28   static void RegisterProfilePrefs(user_prefs::PrefRegistrySyncable* registry);
  29
  30  private:
  31   explicit NavigationCorrectionTabObserver(content::WebContents* web_contents);
  32   friend class content::WebContentsUserData<NavigationCorrectionTabObserver>;
  33
  34   // content::WebContentsObserver overrides:
  35   virtual void RenderViewCreated(
  36       content::RenderViewHost* render_view_host) OVERRIDE;
  37
  38   // content::NotificationObserver overrides:
  39   virtual void Observe(int type,
  40                        const content::NotificationSource& source,
  41                        const content::NotificationDetails& details) OVERRIDE;
  42
  43   // Internal helpers ----------------------------------------------------------
  44
  45   // Returns the URL for the correction service.  If the returned URL
  46   // is empty, the default error pages will be used.
  47   GURL GetNavigationCorrectionURL() const;
  48
  49   // Called when navigation corrections are enabled or disabled.
  50   void OnEnabledChanged();
  51
  52   // Updates the renderer's navigation correction service configuration.
  53   void UpdateNavigationCorrectionInfo(content::RenderViewHost* rvh);
  54
  55   Profile* profile_;
  56   content::NotificationRegistrar registrar_;
  57   PrefChangeRegistrar pref_change_registrar_;
  58
  59   DISALLOW_COPY_AND_ASSIGN(NavigationCorrectionTabObserver);
  60 };
  61
  62 #endif  // CHROME_BROWSER_UI_NAVIGATION_CORRECTION_TAB_OBSERVER_H_