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1 // Copyright 2017 The Chromium Authors. All rights reserved. | 1 // Copyright 2017 The Chromium Authors. All rights reserved. |
2 // Use of this source code is governed by a BSD-style license that can be | 2 // Use of this source code is governed by a BSD-style license that can be |
3 // found in the LICENSE file. | 3 // found in the LICENSE file. |
4 | 4 |
5 #ifndef COMPONENTS_NTP_TILES_ICON_CACHER_H_ | 5 #ifndef COMPONENTS_NTP_TILES_ICON_CACHER_H_ |
6 #define COMPONENTS_NTP_TILES_ICON_CACHER_H_ | 6 #define COMPONENTS_NTP_TILES_ICON_CACHER_H_ |
7 | 7 |
8 #include "base/callback.h" | 8 #include "base/callback.h" |
9 #include "components/ntp_tiles/popular_sites.h" | 9 #include "components/ntp_tiles/popular_sites.h" |
10 | 10 |
11 namespace ntp_tiles { | 11 namespace ntp_tiles { |
12 | 12 |
13 // Ensures that a Popular Sites icon is cached, downloading and saving it if | 13 // Ensures that a Popular Sites icon is cached, downloading and saving it if |
14 // not. | 14 // not. |
15 // | 15 // |
16 // Does not provide any way to get a fetched favicon; use the FaviconService for | 16 // Does not provide any way to get a fetched favicon; use the FaviconService for |
17 // that. All this interface guarantees is that FaviconService will be able to | 17 // that. All this interface guarantees is that FaviconService will be able to |
18 // get you an icon (if it exists). | 18 // get you an icon (if it exists). |
19 class IconCacher { | 19 class IconCacher { |
20 public: | 20 public: |
21 virtual ~IconCacher() = default; | 21 virtual ~IconCacher() = default; |
22 | 22 |
23 // Fetches the icon if necessary, then invokes |done| with true if it was | 23 // Fetches the icon if necessary, then invokes |done| with true if it was |
24 // newly fetched (false if it was already cached or could not be fetched). | 24 // newly fetched or a default icon was loaded for the first time. |
| 25 // It's invoked with False if it was already cached or could not be fetched. |
| 26 // The callback will be invoked twice if a default icon was returned in the |
| 27 // first place. |
25 virtual void StartFetch(PopularSites::Site site, | 28 virtual void StartFetch(PopularSites::Site site, |
26 const base::Callback<void(bool)>& done) = 0; | 29 const base::Callback<void(bool)>& icon_available) = 0; |
27 }; | 30 }; |
28 | 31 |
29 } // namespace ntp_tiles | 32 } // namespace ntp_tiles |
30 | 33 |
31 #endif // COMPONENTS_NTP_TILES_ICON_CACHER_H_ | 34 #endif // COMPONENTS_NTP_TILES_ICON_CACHER_H_ |
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