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# window.cpp Example File
itemviews/simplewidgetmapper/window.cpp

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     #include <QtGui>

     #include "window.h"

     Window::Window(QWidget *parent)
         : QWidget(parent)
     {
         setupModel();

         nameLabel = new QLabel(tr("Na&me:"));
         nameEdit = new QLineEdit();
         addressLabel = new QLabel(tr("&Address:"));
         addressEdit = new QTextEdit();
         ageLabel = new QLabel(tr("A&ge (in years):"));
         ageSpinBox = new QSpinBox();
         nextButton = new QPushButton(tr("&Next"));
         previousButton = new QPushButton(tr("&Previous"));

         nameLabel->setBuddy(nameEdit);
         addressLabel->setBuddy(addressEdit);
         ageLabel->setBuddy(ageSpinBox);

         mapper = new QDataWidgetMapper(this);
         mapper->setModel(model);
         mapper->addMapping(nameEdit, 0);
         mapper->addMapping(addressEdit, 1);
         mapper->addMapping(ageSpinBox, 2);

         connect(previousButton, SIGNAL(clicked()),
                 mapper, SLOT(toPrevious()));
         connect(nextButton, SIGNAL(clicked()),
                 mapper, SLOT(toNext()));
         connect(mapper, SIGNAL(currentIndexChanged(int)),
                 this, SLOT(updateButtons(int)));

         QGridLayout *layout = new QGridLayout();
         layout->addWidget(nameLabel, 0, 0, 1, 1);
         layout->addWidget(nameEdit, 0, 1, 1, 1);
         layout->addWidget(previousButton, 0, 2, 1, 1);
         layout->addWidget(addressLabel, 1, 0, 1, 1);
         layout->addWidget(addressEdit, 1, 1, 2, 1);
         layout->addWidget(nextButton, 1, 2, 1, 1);
         layout->addWidget(ageLabel, 3, 0, 1, 1);
         layout->addWidget(ageSpinBox, 3, 1, 1, 1);
         setLayout(layout);

         setWindowTitle(tr("Simple Widget Mapper"));
         mapper->toFirst();
     }

     void Window::setupModel()
     {
         model = new QStandardItemModel(5, 3, this);

         QStringList names;
         names << "Alice" << "Bob" << "Carol" << "Donald" << "Emma";

         QStringList addresses;
         addresses << "<qt>123 Main Street<br/>Market Town</qt>"
                   << "<qt>PO Box 32<br/>Mail Handling Service"
                      "<br/>Service City</qt>"
                   << "<qt>The Lighthouse<br/>Remote Island</qt>"
                   << "<qt>47338 Park Avenue<br/>Big City</qt>"
                   << "<qt>Research Station<br/>Base Camp<br/>Big Mountain</qt>";

         QStringList ages;
         ages << "20" << "31" << "32" << "19" << "26";

         for (int row = 0; row < 5; ++row) {
           QStandardItem *item = new QStandardItem(names[row]);
           model->setItem(row, 0, item);
           item = new QStandardItem(addresses[row]);
           model->setItem(row, 1, item);
           item = new QStandardItem(ages[row]);
           model->setItem(row, 2, item);
         }
     }

     void Window::updateButtons(int row)
     {
         previousButton->setEnabled(row > 0);
         nextButton->setEnabled(row < model->rowCount() - 1);
     }