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// Copyright 2018 The Chromium Authors
// Use of this source code is governed by a BSD-style license that can be
// found in the LICENSE file.
#ifndef COMPONENTS_THEMES_NTP_BACKGROUND_SERVICE_OBSERVER_H_
#define COMPONENTS_THEMES_NTP_BACKGROUND_SERVICE_OBSERVER_H_
// Observer for NtpBackgroundService.
class NtpBackgroundServiceObserver {
public:
// Called when the CollectionInfo is updated, usually as the result of a
// FetchCollectionInfo() call on the service. You can get the new data via
// NtpBackgroundService::collection_info().
virtual void OnCollectionInfoAvailable() = 0;
// Called when the CollectionImages are updated, usually as the result of a
// FetchCollectionImageInfo() call on the service. You can get the new data
// via NtpBackgroundService::collection_images().
virtual void OnCollectionImagesAvailable() = 0;
// Called when the next CollectionImage is updated as the result of a
// FetchNextCollectionImage() call on the service. You can get the new data
// via NtpBackgroundService::next_image() and
// NtpBackgroundService::next_image_resume_token().
virtual void OnNextCollectionImageAvailable() = 0;
// Called when the OnNtpBackgroundService is shutting down. Observers that
// might outlive the service should use this to unregister themselves, and
// clear out any pointers to the service they might hold.
virtual void OnNtpBackgroundServiceShuttingDown() {}
};
#endif // COMPONENTS_THEMES_NTP_BACKGROUND_SERVICE_OBSERVER_H_
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