src/chrome/browser/ui/webui/ntp/ntp_resource_cache.h

   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_WEBUI_NTP_NTP_RESOURCE_CACHE_H_
   6 #define CHROME_BROWSER_UI_WEBUI_NTP_NTP_RESOURCE_CACHE_H_
   7
   8 #include "base/basictypes.h"
   9 #include "base/compiler_specific.h"
  10 #include "base/memory/ref_counted.h"
  11 #include "base/prefs/pref_change_registrar.h"
  12 #include "base/strings/string16.h"
  13 #include "components/keyed_service/core/keyed_service.h"
  14 #include "content/public/browser/notification_observer.h"
  15 #include "content/public/browser/notification_registrar.h"
  16
  17 class Profile;
  18
  19 namespace base {
  20 class RefCountedMemory;
  21 }
  22
  23 namespace content {
  24 class RenderProcessHost;
  25 }
  26
  27 // This class keeps a cache of NTP resources (HTML and CSS) so we don't have to
  28 // regenerate them all the time.
  29 class NTPResourceCache : public content::NotificationObserver,
  30                          public KeyedService {
  31  public:
  32   enum WindowType {
  33     NORMAL,
  34     INCOGNITO,
  35     GUEST,
  36   };
  37
  38   explicit NTPResourceCache(Profile* profile);
  39   virtual ~NTPResourceCache();
  40
  41   base::RefCountedMemory* GetNewTabHTML(WindowType win_type);
  42   base::RefCountedMemory* GetNewTabCSS(WindowType win_type);
  43
  44   void set_should_show_apps_page(bool should_show_apps_page) {
  45     should_show_apps_page_ = should_show_apps_page;
  46   }
  47   void set_should_show_most_visited_page(bool should_show_most_visited_page) {
  48     should_show_most_visited_page_ = should_show_most_visited_page;
  49   }
  50   void set_should_show_other_devices_menu(bool should_show_other_devices_menu) {
  51     should_show_other_devices_menu_ = should_show_other_devices_menu;
  52   }
  53   void set_should_show_recently_closed_menu(
  54       bool should_show_recently_closed_menu) {
  55     should_show_recently_closed_menu_ = should_show_recently_closed_menu;
  56   }
  57   // content::NotificationObserver interface.
  58   virtual void Observe(int type,
  59                        const content::NotificationSource& source,
  60                        const content::NotificationDetails& details) OVERRIDE;
  61
  62   static WindowType GetWindowType(
  63       Profile* profile, content::RenderProcessHost* render_host);
  64
  65  private:
  66   void OnPreferenceChanged();
  67
  68   void CreateNewTabHTML();
  69
  70   // Helper to determine if the resource cache should be invalidated.
  71   // This is called on every page load, and can be used to check values that
  72   // don't generate a notification when changed (e.g., system preferences).
  73   bool NewTabCacheNeedsRefresh();
  74
  75   Profile* profile_;
  76
  77   scoped_refptr<base::RefCountedMemory> new_tab_html_;
  78
  79   // Returns a message describing any newly-added sync types, or an empty
  80   // string if all types have already been acknowledged.
  81   base::string16 GetSyncTypeMessage();
  82
  83   void CreateNewTabIncognitoHTML();
  84   void CreateNewTabIncognitoCSS();
  85
  86   void CreateNewTabGuestHTML();
  87   void CreateNewTabGuestCSS();
  88
  89   void CreateNewTabCSS();
  90
  91   scoped_refptr<base::RefCountedMemory> new_tab_guest_html_;
  92   scoped_refptr<base::RefCountedMemory> new_tab_guest_css_;
  93   scoped_refptr<base::RefCountedMemory> new_tab_incognito_html_;
  94   scoped_refptr<base::RefCountedMemory> new_tab_incognito_css_;
  95   scoped_refptr<base::RefCountedMemory> new_tab_css_;
  96   content::NotificationRegistrar registrar_;
  97   PrefChangeRegistrar profile_pref_change_registrar_;
  98   PrefChangeRegistrar local_state_pref_change_registrar_;
  99
 100   // Set based on platform_util::IsSwipeTrackingFromScrollEventsEnabled.
 101   bool is_swipe_tracking_from_scroll_events_enabled_;
 102   // Set based on NewTabUI::ShouldShowApps.
 103   bool should_show_apps_page_;
 104   // The next three all default to true and can be manually set, e.g., by the
 105   // chrome://apps page.
 106   bool should_show_most_visited_page_;
 107   bool should_show_other_devices_menu_;
 108   bool should_show_recently_closed_menu_;
 109
 110   DISALLOW_COPY_AND_ASSIGN(NTPResourceCache);
 111 };
 112
 113 #endif  // CHROME_BROWSER_UI_WEBUI_NTP_NTP_RESOURCE_CACHE_H_