1 // Copyright (c) 2011 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_ALTERNATE_NAV_URL_FETCHER_H_ 6 #define CHROME_BROWSER_ALTERNATE_NAV_URL_FETCHER_H_ 7 #pragma once 8 9 #include <string> 10 11 #include "chrome/browser/tab_contents/link_infobar_delegate.h" 12 #include "chrome/common/net/url_fetcher.h" 13 #include "content/common/notification_observer.h" 14 #include "content/common/notification_registrar.h" 15 16 class NavigationController; 17 18 // Attempts to get the HEAD of a host name and displays an info bar if the 19 // request was successful. This is used for single-word queries where we can't 20 // tell if the entry was a search or an intranet hostname. The autocomplete bar 21 // assumes it's a query and issues an AlternateNavURLFetcher to display a "did 22 // you mean" infobar suggesting a navigation. 23 // 24 // The memory management of this object is a bit tricky. The location bar view 25 // will create us and be responsible for us until we attach as an observer 26 // after a pending load starts (it will delete us if this doesn't happen). 27 // Once this pending load starts, we're responsible for deleting ourselves. 28 // We'll do this when the load commits, or when the navigation controller 29 // itself is deleted. 30 class AlternateNavURLFetcher : public NotificationObserver, 31 public URLFetcher::Delegate, 32 public LinkInfoBarDelegate { 33 public: 34 enum State { 35 NOT_STARTED, 36 IN_PROGRESS, 37 SUCCEEDED, 38 FAILED, 39 }; 40 41 explicit AlternateNavURLFetcher(const GURL& alternate_nav_url); 42 virtual ~AlternateNavURLFetcher(); 43 state()44 State state() const { return state_; } 45 46 private: 47 // NotificationObserver 48 virtual void Observe(NotificationType type, 49 const NotificationSource& source, 50 const NotificationDetails& details); 51 52 // URLFetcher::Delegate 53 virtual void OnURLFetchComplete(const URLFetcher* source, 54 const GURL& url, 55 const net::URLRequestStatus& status, 56 int response_code, 57 const ResponseCookies& cookies, 58 const std::string& data); 59 60 // LinkInfoBarDelegate 61 virtual SkBitmap* GetIcon() const; 62 virtual Type GetInfoBarType() const; 63 virtual string16 GetMessageTextWithOffset(size_t* link_offset) const; 64 virtual string16 GetLinkText() const; 65 virtual bool LinkClicked(WindowOpenDisposition disposition); 66 virtual void InfoBarClosed(); 67 68 // Sets |state_| to either SUCCEEDED or FAILED depending on the result of the 69 // fetch. 70 void SetStatusFromURLFetch(const GURL& url, 71 const net::URLRequestStatus& status, 72 int response_code); 73 74 // Displays the infobar if all conditions are met (the page has loaded and 75 // the fetch of the alternate URL succeeded). 76 void ShowInfobarIfPossible(); 77 78 GURL alternate_nav_url_; 79 scoped_ptr<URLFetcher> fetcher_; 80 NavigationController* controller_; 81 State state_; 82 bool navigated_to_entry_; 83 84 // The TabContents the InfoBarDelegate was added to. 85 TabContents* infobar_contents_; 86 87 NotificationRegistrar registrar_; 88 89 DISALLOW_COPY_AND_ASSIGN(AlternateNavURLFetcher); 90 }; 91 92 #endif // CHROME_BROWSER_ALTERNATE_NAV_URL_FETCHER_H_ 93