qt5base-lts/examples/widgets/itemviews/chart/mainwindow.cpp

/****************************************************************************
**
** Copyright (C) 2012 Digia Plc and/or its subsidiary(-ies).
** Contact: http://www.qt-project.org/legal
**
** 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 Digia Plc 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())
        return;

    QFile file(fileName);
    if (!file.open(QFile::ReadOnly | QFile::Text))
        return;

    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())
        return;

    QFile file(fileName);
    if (!file.open(QFile::WriteOnly | QFile::Text))
        return;

    QTextStream stream(&file);
    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);
}