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- // Copyright 2014 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_SEARCH_PROVIDER_LOGOS_LOGO_OBSERVER_H_
- #define COMPONENTS_SEARCH_PROVIDER_LOGOS_LOGO_OBSERVER_H_
- #include "components/search_provider_logos/logo_common.h"
- namespace search_provider_logos {
- // Receives updates when the search provider's logo is available.
- class LogoObserver {
- public:
- virtual ~LogoObserver() {}
- // Called when the cached logo is available and possibly when a freshly
- // downloaded logo is available. |logo| will be NULL if no logo is available.
- // |from_cache| indicates whether the logo was loaded from the cache.
- //
- // If the fresh logo is the same as the cached logo, this will not be called
- // again.
- virtual void OnLogoAvailable(const Logo* logo, bool from_cache) = 0;
- // Called when it has been determined from server that the cached logo (or
- // null) is still valid. This is independent from OnLogoAvailable and is
- // intended for users who need to take some action that can only happen when a
- // logo won't later change.
- // A no-op implementation is provided for users who don't care about this.
- virtual void OnCachedLogoRevalidated() {}
- // Called when the LogoService will no longer send updates to this
- // LogoObserver. For example: after the cached logo is validated, after
- // OnFreshLogoAvailable() is called, or when the LogoService is destructed.
- // This is not called when an observer is removed using RemoveObserver().
- virtual void OnObserverRemoved() = 0;
- };
- } // namespace search_provider_logos
- #endif // COMPONENTS_SEARCH_PROVIDER_LOGOS_LOGO_OBSERVER_H_
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