mainwindow.cpp Example File

 /****************************************************************************
 **
 ** Copyright (C) 2012 Nokia Corporation and/or its subsidiary(-ies).
 ** Contact: http://www.qt-project.org/
 **
 ** This file is part of the examples of the Qt Toolkit.
 **
 ** $QT_BEGIN_LICENSE:BSD$
 ** You may use this file under the terms of the BSD license as follows:
 **
 ** "Redistribution and use in source and binary forms, with or without
 ** modification, are permitted provided that the following conditions are
 ** met:
 **   * Redistributions of source code must retain the above copyright
 **     notice, this list of conditions and the following disclaimer.
 **   * Redistributions in binary form must reproduce the above copyright
 **     notice, this list of conditions and the following disclaimer in
 **     the documentation and/or other materials provided with the
 **     distribution.
 **   * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
 **     the names of its contributors may be used to endorse or promote
 **     products derived from this software without specific prior written
 **     permission.
 **
 ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
 ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
 ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
 ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
 ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
 ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
 ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
 ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
 ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
 ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
 ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
 **
 ** $QT_END_LICENSE$
 **
 ****************************************************************************/

 #include <QtWidgets>

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

 MainWindow::MainWindow()
 {
     QMenu *fileMenu = new QMenu(tr("&File"), this);
     QAction *openAction = fileMenu->addAction(tr("&Open..."));
     openAction->setShortcuts(QKeySequence::Open);
     QAction *saveAction = fileMenu->addAction(tr("&Save As..."));
     saveAction->setShortcuts(QKeySequence::SaveAs);
     QAction *quitAction = fileMenu->addAction(tr("E&xit"));
     quitAction->setShortcuts(QKeySequence::Quit);

     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(870, 550);
 }

 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);

     QHeaderView *headerView = table->horizontalHeader();
     headerView->setStretchLastSection(true);

     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);
     }
 }