| // Copyright 2017 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 COMPONENTS_NTP_TILES_ICON_CACHER_H_ |
| #define COMPONENTS_NTP_TILES_ICON_CACHER_H_ |
| |
| #include "base/callback.h" |
| #include "components/ntp_tiles/popular_sites.h" |
| |
| namespace ntp_tiles { |
| |
| // Ensures that a Popular Sites icon is cached, downloading and saving it if |
| // not. |
| // |
| // Does not provide any way to get a fetched favicon; use the FaviconService for |
| // that. All this interface guarantees is that FaviconService will be able to |
| // get you an icon (if it exists). |
| class IconCacher { |
| public: |
| virtual ~IconCacher() = default; |
| |
| // Fetches the icon if necessary. If a new icon was fetched, the optional |
| // |icon_available| callback will be invoked. |
| // If there are preliminary icons (e.g. provided by static resources), the |
| // optional |preliminary_icon_available| callback will be invoked in addition. |
| // TODO(fhorschig): In case we keep these, make them OnceClosures. |
| virtual void StartFetch(PopularSites::Site site, |
| const base::Closure& icon_available, |
| const base::Closure& preliminary_icon_available) = 0; |
| }; |
| |
| } // namespace ntp_tiles |
| |
| #endif // COMPONENTS_NTP_TILES_ICON_CACHER_H_ |