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/browser_context_keyed_service/browser_context_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 // This class keeps a cache of NTP resources (HTML and CSS) so we don't have to 24 // regenerate them all the time. 25 class NTPResourceCache : public content::NotificationObserver, 26 public BrowserContextKeyedService { 27 public: 28 explicit NTPResourceCache(Profile* profile); 29 virtual ~NTPResourceCache(); 30 31 base::RefCountedMemory* GetNewTabHTML(bool is_incognito); 32 base::RefCountedMemory* GetNewTabCSS(bool is_incognito); 33 34 void set_should_show_apps_page(bool should_show_apps_page) { 35 should_show_apps_page_ = should_show_apps_page; 36 } 37 void set_should_show_most_visited_page(bool should_show_most_visited_page) { 38 should_show_most_visited_page_ = should_show_most_visited_page; 39 } 40 void set_should_show_other_devices_menu(bool should_show_other_devices_menu) { 41 should_show_other_devices_menu_ = should_show_other_devices_menu; 42 } 43 void set_should_show_recently_closed_menu( 44 bool should_show_recently_closed_menu) { 45 should_show_recently_closed_menu_ = should_show_recently_closed_menu; 46 } 47 // content::NotificationObserver interface. 48 virtual void Observe(int type, 49 const content::NotificationSource& source, 50 const content::NotificationDetails& details) OVERRIDE; 51 52 private: 53 void OnPreferenceChanged(); 54 55 void CreateNewTabHTML(); 56 57 // Helper to determine if the resource cache should be invalidated. 58 // This is called on every page load, and can be used to check values that 59 // don't generate a notification when changed (e.g., system preferences). 60 bool NewTabCacheNeedsRefresh(); 61 62 Profile* profile_; 63 64 scoped_refptr<base::RefCountedMemory> new_tab_html_; 65 66 #if !defined(OS_ANDROID) 67 // Returns a message describing any newly-added sync types, or an empty 68 // string if all types have already been acknowledged. 69 string16 GetSyncTypeMessage(); 70 71 void CreateNewTabIncognitoHTML(); 72 73 void CreateNewTabIncognitoCSS(); 74 75 void CreateNewTabCSS(); 76 77 scoped_refptr<base::RefCountedMemory> new_tab_incognito_html_; 78 scoped_refptr<base::RefCountedMemory> new_tab_incognito_css_; 79 scoped_refptr<base::RefCountedMemory> new_tab_css_; 80 content::NotificationRegistrar registrar_; 81 PrefChangeRegistrar profile_pref_change_registrar_; 82 PrefChangeRegistrar local_state_pref_change_registrar_; 83 #endif 84 85 // Set based on platform_util::IsSwipeTrackingFromScrollEventsEnabled. 86 bool is_swipe_tracking_from_scroll_events_enabled_; 87 // Set based on NewTabUI::ShouldShowApps. 88 bool should_show_apps_page_; 89 // The next three all default to true and can be manually set, e.g., by the 90 // chrome://apps page. 91 bool should_show_most_visited_page_; 92 bool should_show_other_devices_menu_; 93 bool should_show_recently_closed_menu_; 94 95 DISALLOW_COPY_AND_ASSIGN(NTPResourceCache); 96 }; 97 98 #endif // CHROME_BROWSER_UI_WEBUI_NTP_NTP_RESOURCE_CACHE_H_ 99