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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/compiler_specific.h"
#include "base/macros.h"
#include "base/memory/ref_counted.h"
#include "base/scoped_observer.h"
#include "components/keyed_service/core/keyed_service.h"
#include "components/prefs/pref_change_registrar.h"
#include "content/public/browser/notification_observer.h"
#include "content/public/browser/notification_registrar.h"
#include "ui/native_theme/native_theme_observer.h"
class Profile;
namespace base {
class RefCountedMemory;
class Value;
}
namespace content {
class RenderProcessHost;
}
namespace ui {
class NativeTheme;
}
// This class keeps a cache of NTP resources (HTML and CSS) so we don't have to
// regenerate them all the time.
// Note: This is only used for incognito and guest mode NTPs (NewTabUI), as well
// as for (non-incognito) app launcher pages (AppLauncherPageUI).
class NTPResourceCache : public content::NotificationObserver,
public KeyedService,
public ui::NativeThemeObserver {
public:
enum WindowType {
NORMAL,
INCOGNITO,
GUEST,
};
explicit NTPResourceCache(Profile* profile);
~NTPResourceCache() override;
base::RefCountedMemory* GetNewTabHTML(WindowType win_type);
base::RefCountedMemory* GetNewTabCSS(WindowType win_type);
// content::NotificationObserver:
void Observe(int type,
const content::NotificationSource& source,
const content::NotificationDetails& details) override;
static WindowType GetWindowType(
Profile* profile, content::RenderProcessHost* render_host);
private:
// ui::NativeThemeObserver:
void OnNativeThemeUpdated(ui::NativeTheme* updated_theme) override;
void OnPreferenceChanged();
// Invalidates the NTPResourceCache.
void Invalidate();
// Helper to determine if the resource cache for the main (not incognito or
// guest) HTML 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 NewTabHTMLNeedsRefresh();
void CreateNewTabHTML();
void CreateNewTabCSS();
void CreateNewTabIncognitoHTML();
void CreateNewTabIncognitoCSS();
void CreateNewTabGuestHTML();
void SetDarkKey(base::Value* dict);
Profile* profile_;
scoped_refptr<base::RefCountedMemory> new_tab_html_;
scoped_refptr<base::RefCountedMemory> new_tab_css_;
scoped_refptr<base::RefCountedMemory> new_tab_guest_html_;
scoped_refptr<base::RefCountedMemory> new_tab_incognito_html_;
scoped_refptr<base::RefCountedMemory> new_tab_incognito_css_;
content::NotificationRegistrar registrar_;
PrefChangeRegistrar profile_pref_change_registrar_;
PrefChangeRegistrar local_state_pref_change_registrar_;
// Set based on platform_util::IsSwipeTrackingFromScrollEventsEnabled.
bool is_swipe_tracking_from_scroll_events_enabled_;
ScopedObserver<ui::NativeTheme, NTPResourceCache> theme_observer_;
DISALLOW_COPY_AND_ASSIGN(NTPResourceCache);
};
#endif // CHROME_BROWSER_UI_WEBUI_NTP_NTP_RESOURCE_CACHE_H_
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