/****************************************************************************
 **
 ** Copyright (C) 2004-2007 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://trolltech.com/products/qt/licenses/licensing/opensource/
 **
 ** If you are unsure which license is appropriate for your use, please
 ** review the following information:
 ** http://trolltech.com/products/qt/licenses/licensing/licensingoverview
 ** or contact the sales department at sales@trolltech.com.
 **
 ** In addition, as a special exception, Trolltech gives you certain
 ** additional rights. These rights are described in the Trolltech GPL
 ** Exception version 1.0, which can be found at
 ** http://www.trolltech.com/products/qt/gplexception/ and in the file
 ** GPL_EXCEPTION.txt in this package.
 **
 ** In addition, as a special exception, Trolltech, as the sole copyright
 ** holder for Qt Designer, grants users of the Qt/Eclipse Integration
 ** plug-in the right for the Qt/Eclipse Integration to link to
 ** functionality provided by Qt Designer and its related libraries.
 **
 ** Trolltech reserves all rights not expressly granted herein.
 **
 ** Trolltech ASA (c) 2007
 **
 ** 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 "imagemodel.h"
 #include "mainwindow.h"
 #include "pixeldelegate.h"
 
 MainWindow::MainWindow()
 {
     currentPath = QDir::homePath();
     model = new ImageModel(this);
 
     QWidget *centralWidget = new QWidget;
 
     view = new QTableView;
     view->setShowGrid(false);
     view->horizontalHeader()->hide();
     view->verticalHeader()->hide();
     view->horizontalHeader()->setMinimumSectionSize(1);
     view->verticalHeader()->setMinimumSectionSize(1);
     view->setModel(model);
 
     PixelDelegate *delegate = new PixelDelegate(this);
     view->setItemDelegate(delegate);
 
     QLabel *pixelSizeLabel = new QLabel(tr("Pixel size:"));
     QSpinBox *pixelSizeSpinBox = new QSpinBox;
     pixelSizeSpinBox->setMinimum(4);
     pixelSizeSpinBox->setMaximum(32);
     pixelSizeSpinBox->setValue(12);
 
     QMenu *fileMenu = new QMenu(tr("&amp;File"), this);
     QAction *openAction = fileMenu->addAction(tr("&amp;Open..."));
     openAction->setShortcut(QKeySequence(tr("Ctrl+O")));
 
     printAction = fileMenu->addAction(tr("&amp;Print..."));
     printAction->setEnabled(false);
     printAction->setShortcut(QKeySequence(tr("Ctrl+P")));
 
     QAction *quitAction = fileMenu->addAction(tr("E&amp;xit"));
     quitAction->setShortcut(QKeySequence(tr("Ctrl+Q")));
 
     QMenu *helpMenu = new QMenu(tr("&amp;Help"), this);
     QAction *aboutAction = helpMenu->addAction(tr("&amp;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()));
     connect(pixelSizeSpinBox, SIGNAL(valueChanged(int)),
             delegate, SLOT(setPixelSize(int)));
     connect(pixelSizeSpinBox, SIGNAL(valueChanged(int)),
             this, SLOT(updateView()));
 
     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);
 }
 
 void MainWindow::chooseImage()
 {
     QString fileName = QFileDialog::getOpenFileName(this,
         tr("Choose an image"), currentPath, "*");
 
     if (!fileName.isEmpty())
         openImage(fileName);
 }
 
 void MainWindow::openImage(const QString &amp;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()
 {
     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(&amp;printer, this);
     dlg->setWindowTitle(tr("Print Image"));
 
     if (dlg->exec() != QDialog::Accepted)
         return;
 
     QPainter painter;
     painter.begin(&amp;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(&amp;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);
     }
 }
 
 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."));
 }
 
 void MainWindow::updateView()
 {
     view->resizeColumnsToContents();
     view->resizeRowsToContents();
 }