chrome/browser/ui/omnibox/omnibox_navigation_observer.h

   1 // Copyright 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_OMNIBOX_OMNIBOX_NAVIGATION_OBSERVER_H_
   6 #define CHROME_BROWSER_UI_OMNIBOX_OMNIBOX_NAVIGATION_OBSERVER_H_
   7
   8 #include <string>
   9
  10 #include "base/memory/ref_counted.h"
  11 #include "base/memory/scoped_ptr.h"
  12 #include "chrome/browser/autocomplete/autocomplete_match.h"
  13 #include "content/public/browser/notification_observer.h"
  14 #include "content/public/browser/notification_registrar.h"
  15 #include "content/public/browser/web_contents_observer.h"
  16 #include "net/url_request/url_fetcher_delegate.h"
  17
  18 class ShortcutsBackend;
  19
  20 namespace net {
  21 class URLFetcher;
  22 class URLRequestStatus;
  23 }
  24
  25 // Monitors omnibox navigations in order to trigger behaviors that depend on
  26 // successful navigations.
  27 //
  28 // Currently two such behaviors exist:
  29 // (1) For single-word queries where we can't tell if the entry was a search or
  30 //     an intranet hostname, the omnibox opens as a search by default, but this
  31 //     class attempts to open as a URL via an HTTP HEAD request.  If successful,
  32 //     displays an infobar once the search result has also loaded.  See
  33 //     AlternateNavInfoBarDelegate.
  34 // (2) Omnibox navigations that complete successfully are added to the
  35 //     Shortcuts backend.
  36 //
  37 // TODO(pkasting): Probably NOTIFICATION_OMNIBOX_OPENED_URL should disappear and
  38 // everyone who listened to it should be triggered from this class instead.
  39 //
  40 // The memory management of this object is a bit tricky. The OmniboxEditModel
  41 // will create us and be responsible for us until we attach as an observer
  42 // after a pending load starts (it will delete us if this doesn't happen).
  43 // Once this pending load starts, we're responsible for deleting ourselves.
  44 class OmniboxNavigationObserver : public content::NotificationObserver,
  45                                   public content::WebContentsObserver,
  46                                   public net::URLFetcherDelegate {
  47  public:
  48   enum LoadState {
  49     LOAD_NOT_SEEN,
  50     LOAD_PENDING,
  51     LOAD_COMMITTED,
  52   };
  53
  54   OmniboxNavigationObserver(Profile* profile,
  55                             const base::string16& text,
  56                             const AutocompleteMatch& match,
  57                             const AutocompleteMatch& alternate_nav_match);
  58   virtual ~OmniboxNavigationObserver();
  59
  60   LoadState load_state() const { return load_state_; }
  61
  62   // Called directly by OmniboxEditModel when an extension-related navigation
  63   // occurs.  Such navigations don't trigger an immediate NAV_ENTRY_PENDING and
  64   // must be handled separately.
  65   void OnSuccessfulNavigation();
  66
  67  private:
  68   enum FetchState {
  69     FETCH_NOT_COMPLETE,
  70     FETCH_SUCCEEDED,
  71     FETCH_FAILED,
  72   };
  73
  74   // content::NotificationObserver:
  75   virtual void Observe(int type,
  76                        const content::NotificationSource& source,
  77                        const content::NotificationDetails& details) OVERRIDE;
  78
  79   // content::WebContentsObserver:
  80   virtual void DidStartNavigationToPendingEntry(
  81       const GURL& url,
  82       content::NavigationController::ReloadType reload_type) OVERRIDE;
  83   virtual void NavigationEntryCommitted(
  84       const content::LoadCommittedDetails& load_details) OVERRIDE;
  85   virtual void WebContentsDestroyed() OVERRIDE;
  86
  87   // net::URLFetcherDelegate:
  88   virtual void OnURLFetchComplete(const net::URLFetcher* source) OVERRIDE;
  89
  90   // Once the load has committed and any URL fetch has completed, this displays
  91   // the alternate nav infobar if necessary, and deletes |this|.
  92   void OnAllLoadingFinished();
  93
  94   const base::string16 text_;
  95   const AutocompleteMatch match_;
  96   const AutocompleteMatch alternate_nav_match_;
  97   scoped_refptr<ShortcutsBackend> shortcuts_backend_;  // NULL in incognito.
  98   scoped_ptr<net::URLFetcher> fetcher_;
  99   LoadState load_state_;
 100   FetchState fetch_state_;
 101
 102   content::NotificationRegistrar registrar_;
 103
 104   DISALLOW_COPY_AND_ASSIGN(OmniboxNavigationObserver);
 105 };
 106
 107 #endif  // CHROME_BROWSER_UI_OMNIBOX_OMNIBOX_NAVIGATION_OBSERVER_H_