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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);

//! [0]

    tableWidget = new QTableWidget(12, 3, this);

//! [0]

    tableWidget->setSelectionMode(QAbstractItemView::ExtendedSelection);

//! [1]

    QTableWidgetItem *valuesHeaderItem = new QTableWidgetItem(tr("Values"));

    tableWidget->setHorizontalHeaderItem(0, valuesHeaderItem);

//! [1]

    valuesHeaderItem->setTextAlignment(Qt::AlignVCenter);

    QTableWidgetItem *squaresHeaderItem = new QTableWidgetItem(tr("Squares"));

    squaresHeaderItem->setIcon(QIcon(QPixmap(":/Images/squared.png")));

    squaresHeaderItem->setTextAlignment(Qt::AlignVCenter);

//! [2]

    QTableWidgetItem *cubesHeaderItem = new QTableWidgetItem(tr("Cubes"));

    cubesHeaderItem->setIcon(QIcon(QPixmap(":/Images/cubed.png")));

    cubesHeaderItem->setTextAlignment(Qt::AlignVCenter);

//! [2]

    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) {

//! [3]

    QTableWidgetItem *newItem = new QTableWidgetItem(tr("%1").arg(

        pow(row, column+1)));

    tableWidget->setItem(row, column, newItem);

//! [3]

        }

    }

    for (int column = 0; column < tableWidget->columnCount(); ++column) {

        QTableWidgetItem *newItem = new QTableWidgetItem;

        newItem->setFlags(Qt::ItemIsEnabled);

        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()

{

//! [4]

    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++;

        }

    }

//! [4]

    if (number > 0)

        tableWidget->currentItem()->setText(QString::number(total));

}