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// Copyright (c) 2012 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 CHROME_BROWSER_UI_TABS_TAB_STRIP_MODEL_ORDER_CONTROLLER_H_
#define CHROME_BROWSER_UI_TABS_TAB_STRIP_MODEL_ORDER_CONTROLLER_H_
#include "chrome/browser/ui/tabs/tab_strip_model.h"
#include "ui/base/page_transition_types.h"
///////////////////////////////////////////////////////////////////////////////
// TabStripModelOrderController
//
// An object that allows different types of ordering and reselection to be
// heuristics plugged into a TabStripModel.
//
class TabStripModelOrderController : public TabStripModelObserver {
public:
explicit TabStripModelOrderController(TabStripModel* tabstrip);
~TabStripModelOrderController() override;
// Determine where to place a newly opened tab by using the supplied
// transition and foreground flag to figure out how it was opened.
int DetermineInsertionIndex(ui::PageTransition transition,
bool foreground);
// Determine where to shift selection after a tab is closed.
int DetermineNewSelectedIndex(int removed_index) const;
// Overridden from TabStripModelObserver:
void ActiveTabChanged(content::WebContents* old_contents,
content::WebContents* new_contents,
int index,
int reason) override;
private:
// Returns a valid index to be selected after the tab at |removing_index| is
// closed. If |index| is after |removing_index|, |index| is adjusted to
// reflect the fact that |removing_index| is going away.
int GetValidIndex(int index, int removing_index) const;
TabStripModel* tabstrip_;
DISALLOW_COPY_AND_ASSIGN(TabStripModelOrderController);
};
#endif // CHROME_BROWSER_UI_TABS_TAB_STRIP_MODEL_ORDER_CONTROLLER_H_
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