Implementation for switching between recently used tabs using ctrl tilde or quoteleft.

chrome/browser/tabs/tab_strip_model.cc

 // 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.
 
 #include "chrome/browser/tabs/tab_strip_model.h"
 
 #include <algorithm>
 #include <map>
 
 #include "base/command_line.h"
@@ skipping 146 matching lines @@
     }
     data->opener = &selected_contents->web_contents()->GetController();
   }
 
   contents_data_.insert(contents_data_.begin() + index, data);
 
   selection_model_.IncrementFrom(index);
 
   FOR_EACH_OBSERVER(TabStripModelObserver, observers_,
                     TabInsertedAt(contents, index, active));
+  if (active)
+    tab_mru_list_manager_.ActivateContents(contents);
+  else
+    tab_mru_list_manager_.AppendContents(contents);
+
   if (active) {
     TabStripSelectionModel new_model;
     new_model.Copy(selection_model_);
     new_model.SetSelectedIndex(index);
     SetSelection(new_model, NOTIFY_DEFAULT);
   }
 }
 
 TabContentsWrapper* TabStripModel::ReplaceTabContentsAt(
     int index,
     TabContentsWrapper* new_contents) {
   DCHECK(ContainsIndex(index));
   TabContentsWrapper* old_contents = GetContentsAt(index);
 
   ForgetOpenersAndGroupsReferencing(
       &(old_contents->web_contents()->GetController()));
 
   contents_data_[index]->contents = new_contents;
 
   FOR_EACH_OBSERVER(TabStripModelObserver, observers_,
                     TabReplacedAt(this, old_contents, new_contents, index));
 
+  tab_mru_list_manager_.ReplaceContents(old_contents, new_contents);
+
   // When the active tab contents is replaced send out selected notification
   // too. We do this as nearly all observers need to treat a replace of the
   // selected contents as selection changing.
   if (active_index() == index) {
     FOR_EACH_OBSERVER(TabStripModelObserver, observers_,
                       ActiveTabChanged(old_contents, new_contents,
                                        active_index(), false));
+    tab_mru_list_manager_.ActivateContents(new_contents);
   }
   return old_contents;
 }
 
 void TabStripModel::ReplaceNavigationControllerAt(
     int index, TabContentsWrapper* contents) {
   // This appears to be OK with no flicker since no redraw event
   // occurs between the call to add an additional tab and one to close
   // the previous tab.
   InsertTabContentsAt(index + 1, contents, ADD_ACTIVE | ADD_INHERIT_GROUP);
@@ skipping 38 matching lines @@
   bool was_selected = IsTabSelected(index);
   int next_selected_index = order_controller_->DetermineNewSelectedIndex(index);
   delete contents_data_.at(index);
   contents_data_.erase(contents_data_.begin() + index);
   ForgetOpenersAndGroupsReferencing(
       &(removed_contents->web_contents()->GetController()));
   if (empty())
     closing_all_ = true;
   FOR_EACH_OBSERVER(TabStripModelObserver, observers_,
       TabDetachedAt(removed_contents, index));
+  tab_mru_list_manager_.RemoveContents(removed_contents);
   if (empty()) {
     selection_model_.Clear();
+    tab_mru_list_manager_.ClearContents();
     // TabDetachedAt() might unregister observers, so send |TabStripEmtpy()| in
     // a second pass.
     FOR_EACH_OBSERVER(TabStripModelObserver, observers_, TabStripEmpty());
   } else {
     int old_active = active_index();
     selection_model_.DecrementFrom(index);
     TabStripSelectionModel old_model;
     old_model.Copy(selection_model_);
     if (index == old_active) {
       NotifyIfTabDeactivated(removed_contents);
@@ skipping 484 matching lines @@
 }
 
 void TabStripModel::SelectPreviousTab() {
   SelectRelativeTab(false);
 }
 
 void TabStripModel::SelectLastTab() {
   ActivateTabAt(count() - 1, true);
 }
 
+void TabStripModel::SelectNextMRUTab() {
+  TabContentsWrapper* contents = tab_mru_list_manager_.GetNextMRUTab();
+  if (contents) {
+    ActivateTabAt(GetIndexOfTabContents(contents),true);
+  }
+}
+
 void TabStripModel::MoveTabNext() {
   // TODO: this likely needs to be updated for multi-selection.
   int new_index = std::min(active_index() + 1, count() - 1);
   MoveTabContentsAt(active_index(), new_index, true);
 }
 
 void TabStripModel::MoveTabPrevious() {
   // TODO: this likely needs to be updated for multi-selection.
   int new_index = std::max(active_index() - 1, 0);
   MoveTabContentsAt(active_index(), new_index, true);
@@ skipping 431 matching lines @@
 
   return retval;
 }
 
 void TabStripModel::InternalCloseTab(TabContentsWrapper* contents,
                                      int index,
                                      bool create_historical_tabs) {
   FOR_EACH_OBSERVER(TabStripModelObserver, observers_,
                     TabClosingAt(this, contents, index));
 
+  tab_mru_list_manager_.RemoveContents(contents);
+
   // Ask the delegate to save an entry for this tab in the historical tab
   // database if applicable.
   if (create_historical_tabs)
     delegate_->CreateHistoricalTab(contents);
 
   // Deleting the TabContentsWrapper will call back to us via
   // NotificationObserver and detach it.
   delete contents;
 }
 
@@ skipping 12 matching lines @@
 
 void TabStripModel::NotifyIfActiveTabChanged(
     TabContentsWrapper* old_contents,
     NotifyTypes notify_types) {
   TabContentsWrapper* new_contents = GetContentsAt(active_index());
   if (old_contents != new_contents) {
     FOR_EACH_OBSERVER(TabStripModelObserver, observers_,
                       ActiveTabChanged(old_contents, new_contents,
                                        active_index(),
                                        notify_types == NOTIFY_USER_GESTURE));
+    tab_mru_list_manager_.ActivateContents(new_contents);
     // Activating a discarded tab reloads it, so it is no longer discarded.
     contents_data_[active_index()]->discarded = false;
   }
 }
 
 void TabStripModel::NotifyIfActiveOrSelectionChanged(
     TabContentsWrapper* old_contents,
     NotifyTypes notify_types,
     const TabStripSelectionModel& old_model) {
   NotifyIfActiveTabChanged(old_contents, notify_types);
@@ skipping 91 matching lines @@
 void TabStripModel::ForgetOpenersAndGroupsReferencing(
     const NavigationController* tab) {
   for (TabContentsDataVector::const_iterator i = contents_data_.begin();
        i != contents_data_.end(); ++i) {
     if ((*i)->group == tab)
       (*i)->group = NULL;
     if ((*i)->opener == tab)
       (*i)->opener = NULL;
   }
 }