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- // 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_
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