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      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_UI_WEBUI_NTP_RESOURCE_CACHE_H_
      6 #define CHROME_BROWSER_UI_WEBUI_NTP_RESOURCE_CACHE_H_
      7 #pragma once
      8 
      9 #include "base/basictypes.h"
     10 #include "base/memory/ref_counted.h"
     11 #include "chrome/browser/prefs/pref_change_registrar.h"
     12 #include "content/common/notification_observer.h"
     13 #include "content/common/notification_registrar.h"
     14 
     15 class Profile;
     16 class RefCountedBytes;
     17 
     18 // This class keeps a cache of NTP resources (HTML and CSS) so we don't have to
     19 // regenerate them all the time.
     20 class NTPResourceCache : public NotificationObserver {
     21  public:
     22   explicit NTPResourceCache(Profile* profile);
     23   virtual ~NTPResourceCache();
     24 
     25   RefCountedBytes* GetNewTabHTML(bool is_incognito);
     26   RefCountedBytes* GetNewTabCSS(bool is_incognito);
     27 
     28   // NotificationObserver interface.
     29   virtual void Observe(NotificationType type,
     30                        const NotificationSource& source,
     31                        const NotificationDetails& details);
     32 
     33  private:
     34   Profile* profile_;
     35 
     36   void CreateNewTabIncognitoHTML();
     37   scoped_refptr<RefCountedBytes> new_tab_incognito_html_;
     38   void CreateNewTabHTML();
     39   scoped_refptr<RefCountedBytes> new_tab_html_;
     40 
     41   void CreateNewTabIncognitoCSS();
     42   scoped_refptr<RefCountedBytes> new_tab_incognito_css_;
     43   void CreateNewTabCSS();
     44   scoped_refptr<RefCountedBytes> new_tab_css_;
     45 
     46   NotificationRegistrar registrar_;
     47   PrefChangeRegistrar pref_change_registrar_;
     48 
     49   DISALLOW_COPY_AND_ASSIGN(NTPResourceCache);
     50 };
     51 
     52 #endif  // CHROME_BROWSER_UI_WEBUI_NTP_RESOURCE_CACHE_H_
     53