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//! [quoting modelview_a]

#include <QTreeView>

#include <QStandardItemModel>

#include <QItemSelectionModel>

#include "mainwindow.h"

MainWindow::MainWindow(QWidget *parent)

    : QMainWindow(parent)

{

    treeView = new QTreeView(this);

    setCentralWidget(treeView);

    standardModel = new QStandardItemModel ;

    QStandardItem *rootNode = standardModel->invisibleRootItem();

    //defining a couple of items

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

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

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

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

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

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

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

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

    //building up the hierarchy

    rootNode->    appendRow(americaItem);

    rootNode->    appendRow(europeItem);

    americaItem-> appendRow(mexicoItem);

    americaItem-> appendRow(usaItem);

    usaItem->     appendRow(bostonItem);

    europeItem->  appendRow(italyItem);

    italyItem->   appendRow(romeItem);

    italyItem->   appendRow(veronaItem);

    //register the model

    treeView->setModel(standardModel);

    treeView->expandAll();

    //selection changes shall trigger a slot

    QItemSelectionModel *selectionModel= treeView->selectionModel();

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

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

}

//! [quoting modelview_a]

//------------------------------------------------------------------------------------

//! [quoting modelview_b]

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

{

    //get the text of the selected item

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

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

    //find out the hierarchy level of the selected item

    int hierarchyLevel=1;

    QModelIndex seekRoot = index;

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

    {

        seekRoot = seekRoot.parent();

        hierarchyLevel++;

    }

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

                         .arg(hierarchyLevel);

    setWindowTitle(showString);

}

//! [quoting modelview_b]