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#include <QtGui>

#include "mainwindow.h"

#include "scribblearea.h"

//! [0]

MainWindow::MainWindow()

{

    scribbleArea = new ScribbleArea;

    setCentralWidget(scribbleArea);

    createActions();

    createMenus();

    setWindowTitle(tr("Scribble"));

    resize(500, 500);

}

//! [0]

//! [1]

void MainWindow::closeEvent(QCloseEvent *event)

//! [1] //! [2]

{

    if (maybeSave()) {

        event->accept();

    } else {

        event->ignore();

    }

}

//! [2]

//! [3]

void MainWindow::open()

//! [3] //! [4]

{

    if (maybeSave()) {

        QString fileName = QFileDialog::getOpenFileName(this,

                                   tr("Open File"), QDir::currentPath());

        if (!fileName.isEmpty())

            scribbleArea->openImage(fileName);

    }

}

//! [4]

//! [5]

void MainWindow::save()

//! [5] //! [6]

{

    QAction *action = qobject_cast<QAction *>(sender());

    QByteArray fileFormat = action->data().toByteArray();

    saveFile(fileFormat);

}

//! [6]

//! [7]

void MainWindow::penColor()

//! [7] //! [8]

{

    QColor newColor = QColorDialog::getColor(scribbleArea->penColor());

    if (newColor.isValid())

        scribbleArea->setPenColor(newColor);

}

//! [8]

//! [9]

void MainWindow::penWidth()

//! [9] //! [10]

{

    bool ok;

    int newWidth = QInputDialog::getInteger(this, tr("Scribble"),

                                            tr("Select pen width:"),

                                            scribbleArea->penWidth(),

                                            1, 50, 1, &ok);

    if (ok)

        scribbleArea->setPenWidth(newWidth);

}

//! [10]

//! [11]

void MainWindow::about()

//! [11] //! [12]

{

    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>"));

}

//! [12]

//! [13]

void MainWindow::createActions()

//! [13] //! [14]

{

    openAct = new QAction(tr("&Open..."), this);

    openAct->setShortcuts(QKeySequence::Open);

    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->setShortcuts(QKeySequence::Quit);

    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()));

}

//! [14]

//! [15]

void MainWindow::createMenus()

//! [15] //! [16]

{

    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);

}

//! [16]

//! [17]

bool MainWindow::maybeSave()

//! [17] //! [18]

{

    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;

}

//! [18]

//! [19]

bool MainWindow::saveFile(const QByteArray &fileFormat)

//! [19] //! [20]

{

    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);

    }

}

//! [20]