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// Copyright (c) 2010 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_TABS_TAB_STRIP_MODEL_ORDER_CONTROLLER_H_
#define CHROME_BROWSER_TABS_TAB_STRIP_MODEL_ORDER_CONTROLLER_H_
#pragma once
#include "chrome/browser/tabs/tab_strip_model.h"
#include "chrome/common/page_transition_types.h"
class TabContents;
///////////////////////////////////////////////////////////////////////////////
// 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);
virtual ~TabStripModelOrderController();
// Sets the insertion policy. Default is INSERT_AFTER.
void set_insertion_policy(TabStripModel::InsertionPolicy policy) {
insertion_policy_ = policy;
}
TabStripModel::InsertionPolicy insertion_policy() const {
return insertion_policy_;
}
// 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(TabContents* new_contents,
PageTransition::Type transition,
bool foreground);
// Returns the index to append tabs at.
int DetermineInsertionIndexForAppending();
// Determine where to shift selection after a tab is closed is made phantom.
// If |is_remove| is false, the tab is not being removed but rather made
// phantom (see description of phantom tabs in TabStripModel).
int DetermineNewSelectedIndex(int removed_index,
bool is_remove) const;
// Overridden from TabStripModelObserver:
virtual void TabSelectedAt(TabContents* old_contents,
TabContents* new_contents,
int index,
bool user_gesture);
private:
// Returns a valid index to be selected after the tab at |removing_index| is
// closed. If |index| is after |removing_index| and |is_remove| is true,
// |index| is adjusted to reflect the fact that |removing_index| is going
// away. This also skips any phantom tabs.
int GetValidIndex(int index, int removing_index, bool is_remove) const;
TabStripModel* tabstrip_;
TabStripModel::InsertionPolicy insertion_policy_;
DISALLOW_COPY_AND_ASSIGN(TabStripModelOrderController);
};
#endif // CHROME_BROWSER_TABS_TAB_STRIP_MODEL_ORDER_CONTROLLER_H_
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