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mainwindow.cpp Example File
^{itemviews/chart/mainwindow.cpp}

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    **
    ** This file is part of the documentation of the Qt Toolkit.
    **
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    ** License version 2.0 as published by the Free Software Foundation
    ** and appearing in the file LICENSE.GPL included in the packaging of
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    /*
      mainwindow.cpp

      A minimal subclass of QTableView with slots to allow the selection model
      to be monitored.
    */

    #include <QtGui>

    #include "pieview.h"
    #include "mainwindow.h"

    MainWindow::MainWindow()
    {
        QMenu *fileMenu = new QMenu(tr("&File"), this);
        QAction *openAction = fileMenu->addAction(tr("&Open..."));
        openAction->setShortcut(QKeySequence(tr("Ctrl+O")));
        QAction *saveAction = fileMenu->addAction(tr("&Save As..."));
        saveAction->setShortcut(QKeySequence(tr("Ctrl+S")));
        QAction *quitAction = fileMenu->addAction(tr("E&xit"));
        quitAction->setShortcut(QKeySequence(tr("Ctrl+Q")));

        setupModel();
        setupViews();

        connect(openAction, SIGNAL(triggered()), this, SLOT(openFile()));
        connect(saveAction, SIGNAL(triggered()), this, SLOT(saveFile()));
        connect(quitAction, SIGNAL(triggered()), qApp, SLOT(quit()));

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

        openFile(":/Charts/qtdata.cht");

        setWindowTitle(tr("Chart"));
        resize(640, 480);
    }

    void MainWindow::setupModel()
    {
        model = new QStandardItemModel(8, 2, this);
        model->setHeaderData(0, Qt::Horizontal, tr("Label"));
        model->setHeaderData(1, Qt::Horizontal, tr("Quantity"));
    }

    void MainWindow::setupViews()
    {
        QSplitter *splitter = new QSplitter;
        QTableView *table = new QTableView;
        pieChart = new PieView;
        splitter->addWidget(table);
        splitter->addWidget(pieChart);
        splitter->setStretchFactor(0, 0);
        splitter->setStretchFactor(1, 1);

        table->setModel(model);
        pieChart->setModel(model);

        QItemSelectionModel *selectionModel = new QItemSelectionModel(model);
        table->setSelectionModel(selectionModel);
        pieChart->setSelectionModel(selectionModel);

        setCentralWidget(splitter);
    }

    void MainWindow::openFile(const QString &path)
    {
        QString fileName;
        if (path.isNull())
            fileName = QFileDialog::getOpenFileName(this, tr("Choose a data file"),
                                                    "", "*.cht");
        else
            fileName = path;

        if (!fileName.isEmpty()) {
            QFile file(fileName);

            if (file.open(QFile::ReadOnly | QFile::Text)) {
                QTextStream stream(&file);
                QString line;

                model->removeRows(0, model->rowCount(QModelIndex()), QModelIndex());

                int row = 0;
                do {
                    line = stream.readLine();
                    if (!line.isEmpty()) {

                        model->insertRows(row, 1, QModelIndex());

                        QStringList pieces = line.split(",", QString::SkipEmptyParts);
                        model->setData(model->index(row, 0, QModelIndex()),
                                       pieces.value(0));
                        model->setData(model->index(row, 1, QModelIndex()),
                                       pieces.value(1));
                        model->setData(model->index(row, 0, QModelIndex()),
                                       QColor(pieces.value(2)), Qt::DecorationRole);
                        row++;
                    }
                } while (!line.isEmpty());

                file.close();
                statusBar()->showMessage(tr("Loaded %1").arg(fileName), 2000);
            }
        }
    }

    void MainWindow::saveFile()
    {
        QString fileName = QFileDialog::getSaveFileName(this,
            tr("Save file as"), "", "*.cht");

        if (!fileName.isEmpty()) {
            QFile file(fileName);
            QTextStream stream(&file);

            if (file.open(QFile::WriteOnly | QFile::Text)) {
                for (int row = 0; row < model->rowCount(QModelIndex()); ++row) {

                    QStringList pieces;

                    pieces.append(model->data(model->index(row, 0, QModelIndex()),
                                              Qt::DisplayRole).toString());
                    pieces.append(model->data(model->index(row, 1, QModelIndex()),
                                              Qt::DisplayRole).toString());
                    pieces.append(model->data(model->index(row, 0, QModelIndex()),
                                              Qt::DecorationRole).toString());

                    stream << pieces.join(",") << "\n";
                }
            }

            file.close();
            statusBar()->showMessage(tr("Saved %1").arg(fileName), 2000);
        }
    }