Home | History | Annotate | Download | only in omnibox 
      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_ALTERNATE_NAV_URL_FETCHER_H_
      6 #define CHROME_BROWSER_UI_OMNIBOX_ALTERNATE_NAV_URL_FETCHER_H_
      7 
      8 #include <string>
      9 
     10 #include "base/memory/scoped_ptr.h"
     11 #include "content/public/browser/notification_observer.h"
     12 #include "content/public/browser/notification_registrar.h"
     13 #include "net/url_request/url_fetcher_delegate.h"
     14 #include "url/gurl.h"
     15 
     16 namespace content {
     17 class NavigationController;
     18 }
     19 
     20 namespace net {
     21 class URLFetcher;
     22 class URLRequestStatus;
     23 }
     24 
     25 // Attempts to get the HEAD of a host name and displays an info bar if the
     26 // request was successful. This is used for single-word queries where we can't
     27 // tell if the entry was a search or an intranet hostname. The autocomplete bar
     28 // assumes it's a query and issues an AlternateNavURLFetcher to display a "did
     29 // you mean" infobar suggesting a navigation.
     30 //
     31 // The memory management of this object is a bit tricky. The location bar view
     32 // will create us and be responsible for us until we attach as an observer
     33 // after a pending load starts (it will delete us if this doesn't happen).
     34 // Once this pending load starts, we're responsible for deleting ourselves.
     35 // We'll do this in the following cases:
     36 //   * The tab is navigated again once we start listening (so the fetch is no
     37 //     longer useful)
     38 //   * The tab is closed before we show an infobar
     39 //   * The intranet fetch fails
     40 //   * None of the above apply, so we successfully show an infobar
     41 class AlternateNavURLFetcher : public content::NotificationObserver,
     42                                public net::URLFetcherDelegate {
     43  public:
     44   enum State {
     45     NOT_STARTED,
     46     IN_PROGRESS,
     47     SUCCEEDED,
     48     FAILED,
     49   };
     50 
     51   explicit AlternateNavURLFetcher(const GURL& alternate_nav_url);
     52   virtual ~AlternateNavURLFetcher();
     53 
     54   State state() const { return state_; }
     55 
     56  private:
     57   // content::NotificationObserver
     58   virtual void Observe(int type,
     59                        const content::NotificationSource& source,
     60                        const content::NotificationDetails& details) OVERRIDE;
     61 
     62   // net::URLFetcherDelegate
     63   virtual void OnURLFetchComplete(const net::URLFetcher* source) OVERRIDE;
     64 
     65   // Sets |controller_| to the supplied pointer and begins fetching
     66   // |alternate_nav_url_|.
     67   void StartFetch(content::NavigationController* controller);
     68 
     69   // Sets |state_| to either SUCCEEDED or FAILED depending on the result of the
     70   // fetch.
     71   void SetStatusFromURLFetch(const GURL& url,
     72                              const net::URLRequestStatus& status,
     73                              int response_code);
     74 
     75   // Displays the infobar if all conditions are met (the page has loaded and
     76   // the fetch of the alternate URL succeeded).  Unless we're still waiting on
     77   // one of the above conditions to finish, this will also delete us, as whether
     78   // or not we show an infobar, there is no reason to live further.
     79   void ShowInfobarIfPossible();
     80 
     81   GURL alternate_nav_url_;
     82   scoped_ptr<net::URLFetcher> fetcher_;
     83   content::NavigationController* controller_;
     84   State state_;
     85   bool navigated_to_entry_;
     86 
     87   content::NotificationRegistrar registrar_;
     88 
     89   DISALLOW_COPY_AND_ASSIGN(AlternateNavURLFetcher);
     90 };
     91 
     92 #endif  // CHROME_BROWSER_UI_OMNIBOX_ALTERNATE_NAV_URL_FETCHER_H_
     93