| // Copyright 2015 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 IOS_CHROME_BROWSER_TAB_PARENTING_GLOBAL_OBSERVER_H_ |
| #define IOS_CHROME_BROWSER_TAB_PARENTING_GLOBAL_OBSERVER_H_ |
| |
| #include <memory> |
| |
| #include "base/callback_list.h" |
| #include "base/macros.h" |
| #include "base/no_destructor.h" |
| |
| namespace web { |
| class WebState; |
| } |
| |
| // Allows clients to observe every tab (i.e., WebState) that is parented. |
| // NOTE: Should be used only to correspond to //chrome flows that listen for |
| // the TAB_PARENTED notification from all sources. |
| class TabParentingGlobalObserver { |
| public: |
| typedef base::Callback<void(web::WebState*)> OnTabParentedCallback; |
| |
| // Returns the instance of TabParentingGlobalObserver. |
| static TabParentingGlobalObserver* GetInstance(); |
| |
| // Registers |cb| to be invoked when a tab is parented. |
| std::unique_ptr<base::CallbackList<void(web::WebState*)>::Subscription> |
| RegisterCallback(const OnTabParentedCallback& cb); |
| |
| // Called to notify all registered callbacks that |web_state| was parented. |
| void OnTabParented(web::WebState* web_state); |
| |
| private: |
| friend class base::NoDestructor<TabParentingGlobalObserver>; |
| |
| TabParentingGlobalObserver(); |
| ~TabParentingGlobalObserver(); |
| |
| base::CallbackList<void(web::WebState*)> on_tab_parented_callback_list_; |
| |
| DISALLOW_COPY_AND_ASSIGN(TabParentingGlobalObserver); |
| }; |
| |
| #endif // IOS_CHROME_BROWSER_TAB_PARENTING_GLOBAL_OBSERVER_H_ |