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addresswidget.cpp Example File
itemviews/addressbook/addresswidget.cpp

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 #include <QtGui>
 #include "addresswidget.h"
 #include "adddialog.h"

 AddressWidget::AddressWidget(QWidget *parent)
     : QTabWidget(parent)
 {
     table = new TableModel(this);
     newAddressTab = new NewAddressTab(this);
     connect(newAddressTab, SIGNAL(sendDetails(QString,QString)),
         this, SLOT(addEntry(QString,QString)));

     addTab(newAddressTab, "Address Book");

     setupTabs();
 }

 void AddressWidget::addEntry()
 {
     AddDialog aDialog;

     if (aDialog.exec()) {
         QString name = aDialog.nameText->text();
         QString address = aDialog.addressText->toPlainText();

         addEntry(name, address);
     }
 }

 void AddressWidget::addEntry(QString name, QString address)
 {
     QList< QPair<QString, QString> >list = table->getList();
     QPair<QString, QString> pair(name, address);

     if (!list.contains(pair)) {
         table->insertRows(0, 1, QModelIndex());

         QModelIndex index = table->index(0, 0, QModelIndex());
         table->setData(index, name, Qt::EditRole);
         index = table->index(0, 1, QModelIndex());
         table->setData(index, address, Qt::EditRole);
         removeTab(indexOf(newAddressTab));
     } else {
         QMessageBox::information(this, tr("Duplicate Name"),
             tr("The name \"%1\" already exists.").arg(name));
     }
 }

 void AddressWidget::editEntry()
 {
     QTableView *temp = static_cast<QTableView*>(currentWidget());
     QSortFilterProxyModel *proxy = static_cast<QSortFilterProxyModel*>(temp->model());
     QItemSelectionModel *selectionModel = temp->selectionModel();

     QModelIndexList indexes = selectionModel->selectedRows();
     QModelIndex index, i;
     QString name;
     QString address;
     int row = -1;

     foreach (index, indexes) {
         row = proxy->mapToSource(index).row();
         i = table->index(row, 0, QModelIndex());
         QVariant varName = table->data(i, Qt::DisplayRole);
         name = varName.toString();

         i = table->index(row, 1, QModelIndex());
         QVariant varAddr = table->data(i, Qt::DisplayRole);
         address = varAddr.toString();
     }

     AddDialog aDialog;
     aDialog.setWindowTitle(tr("Edit a Contact"));

     aDialog.nameText->setReadOnly(true);
     aDialog.nameText->setText(name);
     aDialog.addressText->setText(address);

     if (aDialog.exec()) {
         QString newAddress = aDialog.addressText->toPlainText();
         if (newAddress != address) {
             i = table->index(row, 1, QModelIndex());
             table->setData(i, newAddress, Qt::EditRole);
         }
     }
 }

 void AddressWidget::removeEntry()
 {
     QTableView *temp = static_cast<QTableView*>(currentWidget());
     QSortFilterProxyModel *proxy = static_cast<QSortFilterProxyModel*>(temp->model());
     QItemSelectionModel *selectionModel = temp->selectionModel();

     QModelIndexList indexes = selectionModel->selectedRows();
     QModelIndex index;

     foreach (index, indexes) {
         int row = proxy->mapToSource(index).row();
         table->removeRows(row, 1, QModelIndex());
     }

     if (table->rowCount(QModelIndex()) == 0) {
         insertTab(0, newAddressTab, "Address Book");
     }
 }

 void AddressWidget::setupTabs()
 {
     QStringList groups;
     groups << "ABC" << "DEF" << "GHI" << "JKL" << "MNO" << "PQR" << "STU" << "VW" << "XYZ";

     for (int i = 0; i < groups.size(); ++i) {
         QString str = groups.at(i);

         proxyModel = new QSortFilterProxyModel(this);
         proxyModel->setSourceModel(table);
         proxyModel->setDynamicSortFilter(true);

         QTableView *tableView = new QTableView;
         tableView->setModel(proxyModel);
         tableView->setSortingEnabled(true);
         tableView->setSelectionBehavior(QAbstractItemView::SelectRows);
         tableView->horizontalHeader()->setStretchLastSection(true);
         tableView->verticalHeader()->hide();
         tableView->setEditTriggers(QAbstractItemView::NoEditTriggers);
         tableView->setSelectionMode(QAbstractItemView::SingleSelection);

         QString newStr = QString("^[%1].*").arg(str);

         proxyModel->setFilterRegExp(QRegExp(newStr, Qt::CaseInsensitive));
         proxyModel->setFilterKeyColumn(0);
         proxyModel->sort(0, Qt::AscendingOrder);

         connect(tableView->selectionModel(),
             SIGNAL(selectionChanged(QItemSelection,QItemSelection)),
             this, SIGNAL(selectionChanged(QItemSelection)));

         addTab(tableView, str);
     }
 }

 void AddressWidget::readFromFile(QString fileName)
 {
     QFile file(fileName);

     if (!file.open(QIODevice::ReadOnly)) {
         QMessageBox::information(this, tr("Unable to open file"),
             file.errorString());
         return;
     }

     QList< QPair<QString, QString> > pairs = table->getList();
     QDataStream in(&file);
     in >> pairs;

     if (pairs.isEmpty()) {
         QMessageBox::information(this, tr("No contacts in file"),
             tr("The file you are attempting to open contains no contacts."));
     } else {
         for (int i=0; i<pairs.size(); ++i) {
             QPair<QString, QString> p = pairs.at(i);
             addEntry(p.first, p.second);
         }
     }
 }

 void AddressWidget::writeToFile(QString fileName)
 {
     QFile file(fileName);

     if (!file.open(QIODevice::WriteOnly)) {
         QMessageBox::information(this, tr("Unable to open file"), file.errorString());
         return;
     }

     QList< QPair<QString, QString> > pairs = table->getList();
     QDataStream out(&file);
     out << pairs;
 }


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Qt 4.6.3