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// Copyright (c) 2012 The Chromium Authors. All rights reserved.
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef CHROME_BROWSER_UI_WEBUI_NTP_NTP_RESOURCE_CACHE_H_
#define CHROME_BROWSER_UI_WEBUI_NTP_NTP_RESOURCE_CACHE_H_
#include "base/basictypes.h"
#include "base/compiler_specific.h"
#include "base/memory/ref_counted.h"
#include "base/prefs/pref_change_registrar.h"
#include "base/string16.h"
#include "components/browser_context_keyed_service/browser_context_keyed_service.h"
#include "content/public/browser/notification_observer.h"
#include "content/public/browser/notification_registrar.h"
class Profile;
namespace base {
class RefCountedMemory;
}
// This class keeps a cache of NTP resources (HTML and CSS) so we don't have to
// regenerate them all the time.
class NTPResourceCache : public content::NotificationObserver,
public ProfileKeyedService {
public:
explicit NTPResourceCache(Profile* profile);
virtual ~NTPResourceCache();
base::RefCountedMemory* GetNewTabHTML(bool is_incognito);
base::RefCountedMemory* GetNewTabCSS(bool is_incognito);
void set_should_show_apps_page(bool should_show_apps_page) {
should_show_apps_page_ = should_show_apps_page;
}
void set_should_show_most_visited_page(bool should_show_most_visited_page) {
should_show_most_visited_page_ = should_show_most_visited_page;
}
void set_should_show_other_devices_menu(bool should_show_other_devices_menu) {
should_show_other_devices_menu_ = should_show_other_devices_menu;
}
void set_should_show_recently_closed_menu(
bool should_show_recently_closed_menu) {
should_show_recently_closed_menu_ = should_show_recently_closed_menu;
}
// content::NotificationObserver interface.
virtual void Observe(int type,
const content::NotificationSource& source,
const content::NotificationDetails& details) OVERRIDE;
private:
void OnPreferenceChanged();
void CreateNewTabHTML();
// Helper to determine if the resource cache should be invalidated.
// This is called on every page load, and can be used to check values that
// don't generate a notification when changed (e.g., system preferences).
bool NewTabCacheNeedsRefresh();
Profile* profile_;
scoped_refptr<base::RefCountedMemory> new_tab_html_;
#if !defined(OS_ANDROID)
// Returns a message describing any newly-added sync types, or an empty
// string if all types have already been acknowledged.
string16 GetSyncTypeMessage();
void CreateNewTabIncognitoHTML();
void CreateNewTabIncognitoCSS();
void CreateNewTabCSS();
scoped_refptr<base::RefCountedMemory> new_tab_incognito_html_;
scoped_refptr<base::RefCountedMemory> new_tab_incognito_css_;
scoped_refptr<base::RefCountedMemory> new_tab_css_;
content::NotificationRegistrar registrar_;
PrefChangeRegistrar profile_pref_change_registrar_;
PrefChangeRegistrar local_state_pref_change_registrar_;
#endif
// Set based on platform_util::IsSwipeTrackingFromScrollEventsEnabled.
bool is_swipe_tracking_from_scroll_events_enabled_;
// Set based on NewTabUI::ShouldShowApps.
bool should_show_apps_page_;
// The next three all default to true and can be manually set, e.g., by the
// chrome://apps page.
bool should_show_most_visited_page_;
bool should_show_other_devices_menu_;
bool should_show_recently_closed_menu_;
DISALLOW_COPY_AND_ASSIGN(NTPResourceCache);
};
#endif // CHROME_BROWSER_UI_WEBUI_NTP_NTP_RESOURCE_CACHE_H_
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