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