1 // Copyright (c) 2012 The Chromium Authors. All rights reserved. 2 // Use of this source code is governed by a BSD-style license that can be 3 // found in the LICENSE file. 4 5 #ifndef CHROME_BROWSER_UI_TABS_TAB_STRIP_MODEL_ORDER_CONTROLLER_H_ 6 #define CHROME_BROWSER_UI_TABS_TAB_STRIP_MODEL_ORDER_CONTROLLER_H_ 7 8 #include "chrome/browser/ui/tabs/tab_strip_model.h" 9 #include "content/public/common/page_transition_types.h" 10 11 /////////////////////////////////////////////////////////////////////////////// 12 // TabStripModelOrderController 13 // 14 // An object that allows different types of ordering and reselection to be 15 // heuristics plugged into a TabStripModel. 16 // 17 class TabStripModelOrderController : public TabStripModelObserver { 18 public: 19 explicit TabStripModelOrderController(TabStripModel* tabstrip); 20 virtual ~TabStripModelOrderController(); 21 22 // Determine where to place a newly opened tab by using the supplied 23 // transition and foreground flag to figure out how it was opened. 24 int DetermineInsertionIndex(content::PageTransition transition, 25 bool foreground); 26 27 // Determine where to shift selection after a tab is closed. 28 int DetermineNewSelectedIndex(int removed_index) const; 29 30 // Overridden from TabStripModelObserver: 31 virtual void ActiveTabChanged(content::WebContents* old_contents, 32 content::WebContents* new_contents, 33 int index, 34 int reason) OVERRIDE; 35 36 private: 37 // Returns a valid index to be selected after the tab at |removing_index| is 38 // closed. If |index| is after |removing_index|, |index| is adjusted to 39 // reflect the fact that |removing_index| is going away. 40 int GetValidIndex(int index, int removing_index) const; 41 42 TabStripModel* tabstrip_; 43 44 DISALLOW_COPY_AND_ASSIGN(TabStripModelOrderController); 45 }; 46 47 #endif // CHROME_BROWSER_UI_TABS_TAB_STRIP_MODEL_ORDER_CONTROLLER_H_ 48