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

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

 /****************************************************************************
 **
 ** Copyright (C) 2009 Nokia Corporation and/or its subsidiary(-ies).
 ** Contact: Qt Software Information ([email protected])
 **
 ** This file is part of the examples of the Qt Toolkit.
 **
 ** $QT_BEGIN_LICENSE:LGPL$
 ** 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 Lesser General Public License Usage
 ** Alternatively, this file may be used under the terms of the GNU Lesser
 ** General Public License version 2.1 as published by the Free Software
 ** Foundation and appearing in the file LICENSE.LGPL included in the
 ** packaging of this file.  Please review the following information to
 ** ensure the GNU Lesser General Public License version 2.1 requirements
 ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
 **
 ** In addition, as a special exception, Nokia gives you certain
 ** additional rights. These rights are described in the Nokia Qt LGPL
 ** Exception version 1.0, included in the file LGPL_EXCEPTION.txt in this
 ** package.
 **
 ** GNU General Public License Usage
 ** Alternatively, this file may be used under the terms of the GNU
 ** General Public License version 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 the GNU General Public License version 3.0 requirements will be
 ** met: http://www.gnu.org/copyleft/gpl.html.
 **
 ** If you are unsure which license is appropriate for your use, please
 ** contact the sales department at [email protected].
 ** $QT_END_LICENSE$
 **
 ****************************************************************************/

 #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(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);
     }
 }


Copyright © 2009 Nokia Corporation and/or its subsidiary(-ies) Trademarks
Qt 4.5.1