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 "components/google/core/browser/google_url_tracker.h"
10#include "content/public/browser/web_contents_observer.h"
11#include "content/public/browser/web_contents_user_data.h"
12
13class Profile;
14
15namespace user_prefs {
16class PrefRegistrySyncable;
17}
18
19// Per-tab class to implement navigation suggestion service functionality.
20class 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();
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_
59