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 "chrome/browser/google/google_url_tracker.h"
  10 #include "content/public/browser/web_contents_observer.h"
  11 #include "content/public/browser/web_contents_user_data.h"
  12
  13 class Profile;
  14
  15 namespace user_prefs {
  16 class PrefRegistrySyncable;
  17 }
  18
  19 // Per-tab class to implement navigation suggestion service functionality.
  20 class NavigationCorrectionTabObserver
  21     : public content::WebContentsObserver,
  22       public content::WebContentsUserData<NavigationCorrectionTabObserver> {
  23  public:
  24   virtual ~NavigationCorrectionTabObserver();
  25
  26   static void RegisterProfilePrefs(user_prefs::PrefRegistrySyncable* registry);
  27
  28  private:
  29   explicit NavigationCorrectionTabObserver(content::WebContents* web_contents);
  30   friend class content::WebContentsUserData<NavigationCorrectionTabObserver>;
  31
  32   // content::WebContentsObserver overrides:
  33   virtual void RenderViewCreated(
  34       content::RenderViewHost* render_view_host) OVERRIDE;
  35
  36   // Internal helpers ----------------------------------------------------------
  37
  38   // Callback that is called when the Google URL is updated.
  39   void OnGoogleURLUpdated(GURL old_url, GURL new_url);
  40
  41   // Returns the URL for the correction service.  If the returned URL
  42   // is empty, the default error pages will be used.
  43   GURL GetNavigationCorrectionURL() const;
  44
  45   // Called when navigation corrections are enabled or disabled.
  46   void OnEnabledChanged();
  47
  48   // Updates the renderer's navigation correction service configuration.
  49   void UpdateNavigationCorrectionInfo(content::RenderViewHost* rvh);
  50
  51   Profile* profile_;
  52   PrefChangeRegistrar pref_change_registrar_;
  53   scoped_ptr<GoogleURLTracker::Subscription> google_url_updated_subscription_;
  54
  55   DISALLOW_COPY_AND_ASSIGN(NavigationCorrectionTabObserver);
  56 };
  57
  58 #endif  // CHROME_BROWSER_UI_NAVIGATION_CORRECTION_TAB_OBSERVER_H_