source: trunk/examples/itemviews/pixelator/mainwindow.cpp

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** This file is part of the examples of the Qt Toolkit.
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#include <QtGui>

#include "imagemodel.h"
#include "mainwindow.h"
#include "pixeldelegate.h"

//! [0]
MainWindow::MainWindow()
{
//! [0]
    currentPath = QDir::homePath();
    model = new ImageModel(this);

    QWidget *centralWidget = new QWidget;

//! [1]
    view = new QTableView;
    view->setShowGrid(false);
    view->horizontalHeader()->hide();
    view->verticalHeader()->hide();
    view->horizontalHeader()->setMinimumSectionSize(1);
    view->verticalHeader()->setMinimumSectionSize(1);
    view->setModel(model);
//! [1]

//! [2]
    PixelDelegate *delegate = new PixelDelegate(this);
    view->setItemDelegate(delegate);
//! [2]

//! [3]
    QLabel *pixelSizeLabel = new QLabel(tr("Pixel size:"));
    QSpinBox *pixelSizeSpinBox = new QSpinBox;
    pixelSizeSpinBox->setMinimum(4);
    pixelSizeSpinBox->setMaximum(32);
    pixelSizeSpinBox->setValue(12);
//! [3]

    QMenu *fileMenu = new QMenu(tr("&File"), this);
    QAction *openAction = fileMenu->addAction(tr("&Open..."));
    openAction->setShortcuts(QKeySequence::Open);

    printAction = fileMenu->addAction(tr("&Print..."));
    printAction->setEnabled(false);
    printAction->setShortcut(QKeySequence::Print);

    QAction *quitAction = fileMenu->addAction(tr("E&xit"));
    quitAction->setShortcuts(QKeySequence::Quit);

    QMenu *helpMenu = new QMenu(tr("&Help"), this);
    QAction *aboutAction = helpMenu->addAction(tr("&About"));

    menuBar()->addMenu(fileMenu);
    menuBar()->addSeparator();
    menuBar()->addMenu(helpMenu);

    connect(openAction, SIGNAL(triggered()), this, SLOT(chooseImage()));
    connect(printAction, SIGNAL(triggered()), this, SLOT(printImage()));
    connect(quitAction, SIGNAL(triggered()), qApp, SLOT(quit()));
    connect(aboutAction, SIGNAL(triggered()), this, SLOT(showAboutBox()));
//! [4]
    connect(pixelSizeSpinBox, SIGNAL(valueChanged(int)),
            delegate, SLOT(setPixelSize(int)));
    connect(pixelSizeSpinBox, SIGNAL(valueChanged(int)),
            this, SLOT(updateView()));
//! [4]

    QHBoxLayout *controlsLayout = new QHBoxLayout;
    controlsLayout->addWidget(pixelSizeLabel);
    controlsLayout->addWidget(pixelSizeSpinBox);
    controlsLayout->addStretch(1);

    QVBoxLayout *mainLayout = new QVBoxLayout;
    mainLayout->addWidget(view);
    mainLayout->addLayout(controlsLayout);
    centralWidget->setLayout(mainLayout);

    setCentralWidget(centralWidget);

    setWindowTitle(tr("Pixelator"));
    resize(640, 480);
//! [5]
}
//! [5]

void MainWindow::chooseImage()
{
    QString fileName = QFileDialog::getOpenFileName(this,
        tr("Choose an image"), currentPath, "*");

    if (!fileName.isEmpty())
        openImage(fileName);
}

void MainWindow::openImage(const QString &fileName)
{
    QImage image;

    if (image.load(fileName)) {
        model->setImage(image);
        if (!fileName.startsWith(":/")) {
            currentPath = fileName;
            setWindowTitle(tr("%1 - Pixelator").arg(currentPath));
        }

        printAction->setEnabled(true);
        updateView();
    }
}

void MainWindow::printImage()
{
#ifndef QT_NO_PRINTER
    if (model->rowCount(QModelIndex())*model->columnCount(QModelIndex())
        > 90000) {
            QMessageBox::StandardButton answer;
            answer = QMessageBox::question(this, tr("Large Image Size"),
            tr("The printed image may be very large. Are you sure that "
               "you want to print it?"),
            QMessageBox::Yes | QMessageBox::No);
        if (answer == QMessageBox::No)
            return;