source: branches/4.5.1/doc/src/snippets/qtablewidget-dnd/mainwindow.cpp

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#include <QtGui>
#include "math.h"

#include "mainwindow.h"

MainWindow::MainWindow()
{
    QMenu *fileMenu = new QMenu(tr("&File"));

    QAction *quitAction = fileMenu->addAction(tr("E&xit"));
    quitAction->setShortcut(tr("Ctrl+Q"));

    QMenu *itemsMenu = new QMenu(tr("&Items"));

    QAction *sumItemsAction = itemsMenu->addAction(tr("&Sum Items"));
    QAction *averageItemsAction = itemsMenu->addAction(tr("&Average Items"));

    menuBar()->addMenu(fileMenu);
    menuBar()->addMenu(itemsMenu);

    tableWidget = new QTableWidget(12, 3, this);
    tableWidget->setSelectionMode(QAbstractItemView::ExtendedSelection);
    tableWidget->setDragEnabled(true);
    tableWidget->setAcceptDrops(true);
    tableWidget->setDropIndicatorShown(true);

    QTableWidgetItem *valuesHeaderItem = new QTableWidgetItem(tr("Values"));
    tableWidget->setHorizontalHeaderItem(0, valuesHeaderItem);
    valuesHeaderItem->setTextAlignment(Qt::AlignVCenter);
    QTableWidgetItem *squaresHeaderItem = new QTableWidgetItem(tr("Squares"));
    squaresHeaderItem->setIcon(QIcon(QPixmap(":/Images/squared.png")));
    squaresHeaderItem->setTextAlignment(Qt::AlignVCenter);
    QTableWidgetItem *cubesHeaderItem = new QTableWidgetItem(tr("Cubes"));
    cubesHeaderItem->setIcon(QIcon(QPixmap(":/Images/cubed.png")));
    cubesHeaderItem->setTextAlignment(Qt::AlignVCenter);
    tableWidget->setHorizontalHeaderItem(1, squaresHeaderItem);
    tableWidget->setHorizontalHeaderItem(2, cubesHeaderItem);

    connect(quitAction, SIGNAL(triggered()), this, SLOT(close()));
    connect(sumItemsAction, SIGNAL(triggered()), this, SLOT(sumItems()));
    connect(averageItemsAction, SIGNAL(triggered()), this, SLOT(averageItems()));

    setupTableItems();

    setCentralWidget(tableWidget);
    setWindowTitle(tr("Table Widget"));
}

void MainWindow::setupTableItems()
{
    for (int row = 0; row < tableWidget->rowCount()-1; ++row) {
        for (int column = 0; column < tableWidget->columnCount(); ++column) {
    QTableWidgetItem *newItem = new QTableWidgetItem(tr("%1").arg(
        pow((float)row, (float)column+1)));
    tableWidget->setItem(row, column, newItem);
        }
    }
    for (int column = 0; column < tableWidget->columnCount(); ++column) {
        QTableWidgetItem *newItem = new QTableWidgetItem;
        newItem->setFlags(Qt::ItemIsEnabled | Qt::ItemIsUserCheckable);
        tableWidget->setItem(tableWidget->rowCount()-1, column, newItem);
    }
}

void MainWindow::averageItems()
{
    QList<QTableWidgetItem *> selected = tableWidget->selectedItems();
    QTableWidgetItem *item;
    int number = 0;
    double total = 0;

    foreach (item, selected) {
        bool ok;
        double value = item->text().toDouble(&ok);
        
        if (ok && !item->text().isEmpty()) {
            total += value;
            number++;
        }
    }
    if (number > 0)
        tableWidget->currentItem()->setText(QString::number(total/number));
}

void MainWindow::sumItems()
{
    QList<QTableWidgetItem *> selected = tableWidget->selectedItems();
    QTableWidgetItem *item;
    int number = 0;
    double total = 0;

    foreach (item, selected) {
        bool ok;
        double value = item->text().toDouble(&ok);

        if (ok && !item->text().isEmpty()) {
            total += value;
            number++;
        }
    }
    if (number > 0)
        tableWidget->currentItem()->setText(QString::number(total));
}