| // 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.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_ |