|  | Home · All Namespaces · All Classes · Main Classes · Grouped Classes · Modules · Functions |

# mainwindow.cpp Example File
itemviews/chart/mainwindow.cpp

     /****************************************************************************
     **
     ** Copyright (C) 2008 Nokia Corporation and/or its subsidiary(-ies).
     ** Contact: Qt Software Information (qt-info@nokia.com)
     **
     ** This file is part of the example classes of the Qt Toolkit.
     **
     ** Commercial Usage
     ** Licensees holding valid Qt Commercial licenses may use this file in
     ** accordance with the Qt Commercial License Agreement provided with the
     ** Software or, alternatively, in accordance with the terms contained in
     ** a written agreement between you and Nokia.
     **
     **
     ** GNU General Public License Usage
     ** Alternatively, this file may be used under the terms of the GNU
     ** General Public License versions 2.0 or 3.0 as published by the Free
     ** Software Foundation and appearing in the file LICENSE.GPL included in
     ** the packaging of this file.  Please review the following information
     ** to ensure GNU General Public Licensing requirements will be met:
     ** http://www.fsf.org/licensing/licenses/info/GPLv2.html and
     ** http://www.gnu.org/copyleft/gpl.html.  In addition, as a special
     ** exception, Nokia gives you certain additional rights. These rights
     ** are described in the Nokia Qt GPL Exception version 1.3, included in
     ** the file GPL_EXCEPTION.txt in this package.
     **
     ** Qt for Windows(R) Licensees
     ** As a special exception, Nokia, as the sole copyright holder for Qt
     ** Designer, grants users of the Qt/Eclipse Integration plug-in the
     ** right for the Qt/Eclipse Integration to link to functionality
     ** provided by Qt Designer and its related libraries.
     **
     ** If you are unsure which license is appropriate for your use, please
     ** contact the sales department at qt-sales@nokia.com.
     **
     ****************************************************************************/

     #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);
         }
     }