| // Copyright 2017 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_WEB_STATE_LIST_WEB_STATE_LIST_ORDER_CONTROLLER_H_ |
| #define IOS_CHROME_BROWSER_WEB_STATE_LIST_WEB_STATE_LIST_ORDER_CONTROLLER_H_ |
| |
| #include "base/macros.h" |
| |
| class WebStateList; |
| |
| namespace web { |
| class WebState; |
| } |
| |
| // WebStateListOrderController allows different types of ordering and |
| // selection heuristics to be plugged into WebStateList. |
| class WebStateListOrderController { |
| public: |
| explicit WebStateListOrderController(WebStateList* web_state_list); |
| ~WebStateListOrderController(); |
| |
| // Determines where to place a newly opened WebState given its opener. |
| int DetermineInsertionIndex(web::WebState* opener) const; |
| |
| // Determines where to shift the active index after a WebState is closed. |
| int DetermineNewActiveIndex(int removing_index) const; |
| |
| private: |
| // Returns a valid index to be selected after the WebState at |removing_index| |
| // is detached, adjusting |index| to reflect that |removing_index| is going |
| // away. |
| int GetValidIndex(int index, int removing_index) const; |
| |
| WebStateList* web_state_list_; |
| |
| DISALLOW_COPY_AND_ASSIGN(WebStateListOrderController); |
| }; |
| |
| #endif // IOS_CHROME_BROWSER_WEB_STATE_LIST_WEB_STATE_LIST_ORDER_CONTROLLER_H_ |