mainwindow.cpp

qt-x11-opensource-src-4.1.4.tar.gz源码

/****************************************************************************
**
** Copyright (C) 2004-2006 Trolltech ASA. All rights reserved.
**
** This file is part of the example classes of the Qt Toolkit.
**
** This file may be used under the terms of the GNU General Public
** License version 2.0 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.trolltech.com/products/qt/opensource.html
**
** If you are unsure which license is appropriate for your use, please
** review the following information:
** http://www.trolltech.com/products/qt/licensing.html or contact the
** sales department at [e-mail].
**
** This file is provided AS IS with NO WARRANTY OF ANY KIND, INCLUDING THE
** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
**
****************************************************************************/

#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);
    }
}