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Trolltech reserves all rights not expressly** granted herein.**** 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 "mainwindow.h"#include "scribblearea.h"MainWindow::MainWindow(){    scribbleArea = new ScribbleArea;    setCentralWidget(scribbleArea);    createActions();    createMenus();    setWindowTitle(tr("Scribble"));    resize(500, 500);}void MainWindow::closeEvent(QCloseEvent *event){    if (maybeSave()) {        event->accept();    } else {        event->ignore();    }}void MainWindow::open(){    if (maybeSave()) {        QString fileName = QFileDialog::getOpenFileName(this,                                   tr("Open File"), QDir::currentPath());        if (!fileName.isEmpty())            scribbleArea->openImage(fileName);    }}void MainWindow::save(){    QAction *action = qobject_cast<QAction *>(sender());    QByteArray fileFormat = action->data().toByteArray();    saveFile(fileFormat);}void MainWindow::penColor(){    QColor newColor = QColorDialog::getColor(scribbleArea->penColor());    if (newColor.isValid())        scribbleArea->setPenColor(newColor);}void MainWindow::penWidth(){    bool ok;    int newWidth = QInputDialog::getInteger(this, tr("Scribble"),                                            tr("Select pen width:"),                                            scribbleArea->penWidth(),                                            1, 50, 1, &ok);    if (ok)        scribbleArea->setPenWidth(newWidth);}void MainWindow::about(){    QMessageBox::about(this, tr("About Scribble"),            tr("<p>The <b>Scribble</b> example shows how to use QMainWindow as the "               "base widget for an application, and how to reimplement some of "               "QWidget's event handlers to receive the events generated for "               "the application's widgets:</p><p> We reimplement the mouse event "               "handlers to facilitate drawing, the paint event handler to "               "update the application and the resize event handler to optimize "               "the application's appearance. In addition we reimplement the "               "close event handler to intercept the close events before "               "terminating the application.</p><p> The example also demonstrates "               "how to use QPainter to draw an image in real time, as well as "               "to repaint widgets.</p>"));}void MainWindow::createActions(){    openAct = new QAction(tr("&Open..."), this);    openAct->setShortcut(tr("Ctrl+O"));    connect(openAct, SIGNAL(triggered()), this, SLOT(open()));    foreach (QByteArray format, QImageWriter::supportedImageFormats()) {        QString text = tr("%1...").arg(QString(format).toUpper());        QAction *action = new QAction(text, this);        action->setData(format);        connect(action, SIGNAL(triggered()), this, SLOT(save()));        saveAsActs.append(action);    }    printAct = new QAction(tr("&Print..."), this);    connect(printAct, SIGNAL(triggered()), scribbleArea, SLOT(print()));    exitAct = new QAction(tr("E&xit"), this);    exitAct->setShortcut(tr("Ctrl+Q"));    connect(exitAct, SIGNAL(triggered()), this, SLOT(close()));    penColorAct = new QAction(tr("&Pen Color..."), this);    connect(penColorAct, SIGNAL(triggered()), this, SLOT(penColor()));    penWidthAct = new QAction(tr("Pen &Width..."), this);    connect(penWidthAct, SIGNAL(triggered()), this, SLOT(penWidth()));    clearScreenAct = new QAction(tr("&Clear Screen"), this);    clearScreenAct->setShortcut(tr("Ctrl+L"));    connect(clearScreenAct, SIGNAL(triggered()),            scribbleArea, SLOT(clearImage()));    aboutAct = new QAction(tr("&About"), this);    connect(aboutAct, SIGNAL(triggered()), this, SLOT(about()));    aboutQtAct = new QAction(tr("About &Qt"), this);    connect(aboutQtAct, SIGNAL(triggered()), qApp, SLOT(aboutQt()));}void MainWindow::createMenus(){    saveAsMenu = new QMenu(tr("&Save As"), this);    foreach (QAction *action, saveAsActs)        saveAsMenu->addAction(action);    fileMenu = new QMenu(tr("&File"), this);    fileMenu->addAction(openAct);    fileMenu->addMenu(saveAsMenu);    fileMenu->addAction(printAct);    fileMenu->addSeparator();    fileMenu->addAction(exitAct);    optionMenu = new QMenu(tr("&Options"), this);    optionMenu->addAction(penColorAct);    optionMenu->addAction(penWidthAct);    optionMenu->addSeparator();    optionMenu->addAction(clearScreenAct);    helpMenu = new QMenu(tr("&Help"), this);    helpMenu->addAction(aboutAct);    helpMenu->addAction(aboutQtAct);    menuBar()->addMenu(fileMenu);    menuBar()->addMenu(optionMenu);    menuBar()->addMenu(helpMenu);}bool MainWindow::maybeSave(){    if (scribbleArea->isModified()) {       QMessageBox::StandardButton ret;       ret = QMessageBox::warning(this, tr("Scribble"),                          tr("The image has been modified.\n"                             "Do you want to save your changes?"),                          QMessageBox::Save | QMessageBox::Discard			  | QMessageBox::Cancel);        if (ret == QMessageBox::Save) {            return saveFile("png");        } else if (ret == QMessageBox::Cancel) {            return false;        }    }    return true;}bool MainWindow::saveFile(const QByteArray &fileFormat){    QString initialPath = QDir::currentPath() + "/untitled." + fileFormat;    QString fileName = QFileDialog::getSaveFileName(this, tr("Save As"),                               initialPath,                               tr("%1 Files (*.%2);;All Files (*)")                               .arg(QString(fileFormat.toUpper()))                               .arg(QString(fileFormat)));    if (fileName.isEmpty()) {        return false;    } else {        return scribbleArea->saveImage(fileName, fileFormat);    }}