// Copyright 2020 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 WEBLAYER_PUBLIC_BROWSER_OBSERVER_H_ #define WEBLAYER_PUBLIC_BROWSER_OBSERVER_H_ #include "base/observer_list_types.h" namespace weblayer { class Tab; class BrowserObserver : public base::CheckedObserver { public: // A Tab has been been added to the Browser. virtual void OnTabAdded(Tab* tab) {} // A Tab has been removed from the Browser. |active_tab_changed| indicates // if the active tab changed as a result. If the active tab changed, // OnActiveTabChanged() is also called. virtual void OnTabRemoved(Tab* tab, bool active_tab_changed) {} // The tab the user is interacting with has changed. |tab| may be null if no // tabs are active. virtual void OnActiveTabChanged(Tab* tab) {} protected: ~BrowserObserver() override {} }; } // namespace weblayer #endif // WEBLAYER_PUBLIC_BROWSER_OBSERVER_H_