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     3 ** Copyright (C) 2010 Nokia Corporation and/or its subsidiary(-ies).

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    39 ****************************************************************************/

    40 

    41 //! [quoting modelview_a]

    42 #include <QTreeView>

    43 #include <QStandardItemModel>

    44 #include <QItemSelectionModel>

    45 #include "modelview.h"

    46 

    47 ModelView::ModelView(QWidget *parent)

    48     : QMainWindow(parent)

    49 {

    50     treeView = new QTreeView(this);

    51     setCentralWidget(treeView);

    52     standardModel = new QStandardItemModel ;

    53     QStandardItem *rootNode = standardModel->invisibleRootItem();

    54 

    55 

    56     //defining a couple of items

    57     QStandardItem *americaItem = new QStandardItem("America");

    58     QStandardItem *mexicoItem =  new QStandardItem("Canada");

    59     QStandardItem *usaItem =     new QStandardItem("USA");

    60     QStandardItem *bostonItem =  new QStandardItem("Boston");

    61     QStandardItem *europeItem =  new QStandardItem("Europe");

    62     QStandardItem *italyItem =   new QStandardItem("Italy");

    63     QStandardItem *romeItem =    new QStandardItem("Rome");

    64     QStandardItem *veronaItem =  new QStandardItem("Verona");

    65 

    66     //building up the hierarchy

    67     rootNode->    appendRow(americaItem);

    68     rootNode->    appendRow(europeItem);

    69     americaItem-> appendRow(mexicoItem);

    70     americaItem-> appendRow(usaItem);

    71     usaItem->     appendRow(bostonItem);

    72     europeItem->  appendRow(italyItem);

    73     italyItem->   appendRow(romeItem);

    74     italyItem->   appendRow(veronaItem);

    75     

    76     //register the model

    77     treeView->setModel(standardModel);

    78     treeView->expandAll();

    79 

    80     //selection changes shall trigger a slot

    81     QItemSelectionModel *selectionModel= treeView->selectionModel();

    82     connect(selectionModel, SIGNAL(selectionChanged (const QItemSelection &, const QItemSelection &)),

    83             this, SLOT(selectionChangedSlot(const QItemSelection &, const QItemSelection &)));

    84 }

    85 //! [quoting modelview_a]

    86 

    87 //------------------------------------------------------------------------------------

    88 

    89 //! [quoting modelview_b]

    90 void ModelView::selectionChangedSlot(const QItemSelection & /*newSelection*/, const QItemSelection & /*oldSelection*/)

    91 {

    92     const QModelIndex index = treeView->selectionModel()->currentIndex();

    93     QString selectedText = index.data(Qt::DisplayRole).toString();

    94     int hierarchyLevel=1;

    95     QModelIndex seekRoot = index;

    96     while(seekRoot.parent() != QModelIndex())

    97     {

    98         seekRoot = seekRoot.parent();

    99         hierarchyLevel++;

   100     }

   101     QString showString = QString("%1, Level %2").arg(selectedText)

   102                          .arg(hierarchyLevel);

   103     setWindowTitle(showString);

   104 }

   105 //! [quoting modelview_b]

   106 

   107