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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;

    }

    QPrinter printer(QPrinter::HighResolution);

    QPrintDialog *dlg = new QPrintDialog(&printer, this);

    dlg->setWindowTitle(tr("Print Image"));

    if (dlg->exec() != QDialog::Accepted)

        return;

    QPainter painter;

    painter.begin(&printer);

    int rows = model->rowCount(QModelIndex());

    int columns = model->columnCount(QModelIndex());

    int sourceWidth = (columns+1) * ItemSize;

    int sourceHeight = (rows+1) * ItemSize;

    painter.save();

    double xscale = printer.pageRect().width()/double(sourceWidth);

    double yscale = printer.pageRect().height()/double(sourceHeight);

    double scale = qMin(xscale, yscale);

    painter.translate(printer.paperRect().x() + printer.pageRect().width()/2,

                      printer.paperRect().y() + printer.pageRect().height()/2);

    painter.scale(scale, scale);

    painter.translate(-sourceWidth/2, -sourceHeight/2);

    QStyleOptionViewItem option;

    QModelIndex parent = QModelIndex();

    QProgressDialog progress(tr("Printing..."), tr("Cancel"), 0, rows, this);

    progress.setWindowModality(Qt::ApplicationModal);

    float y = ItemSize/2;

    for (int row = 0; row < rows; ++row) {

        progress.setValue(row);

        qApp->processEvents();

        if (progress.wasCanceled())

            break;

        float x = ItemSize/2;

        for (int column = 0; column < columns; ++column) {

            option.rect = QRect(int(x), int(y), ItemSize, ItemSize);

            view->itemDelegate()->paint(&painter, option,

                                        model->index(row, column, parent));

            x = x + ItemSize;

        }

        y = y + ItemSize;

    }

    progress.setValue(rows);

    painter.restore();

    painter.end();

    if (progress.wasCanceled()) {

        QMessageBox::information(this, tr("Printing canceled"),

            tr("The printing process was canceled."), QMessageBox::Cancel);

    }

#else

    QMessageBox::information(this, tr("Printing canceled"), 

        tr("Printing is not supported on this Qt build"), QMessageBox::Cancel);

#endif

}

void MainWindow::showAboutBox()

{

    QMessageBox::about(this, tr("About the Pixelator example"),

        tr("This example demonstrates how a standard view and a custom\n"

           "delegate can be used to produce a specialized representation\n"

           "of data in a simple custom model."));

}

//! [6]

void MainWindow::updateView()

{

    view->resizeColumnsToContents();

    view->resizeRowsToContents();

}

//! [6]