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//! [0]

#include <QtGui>

#include "mainwindow.h"

//! [0]

//! [1]

MainWindow::MainWindow()

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

{

    textEdit = new QPlainTextEdit;

    setCentralWidget(textEdit);

    createActions();

    createMenus();

    createToolBars();

    createStatusBar();

    readSettings();

    connect(textEdit->document(), SIGNAL(contentsChanged()),

            this, SLOT(documentWasModified()));

    setCurrentFile("");

    setUnifiedTitleAndToolBarOnMac(true);

}

//! [2]

//! [3]

void MainWindow::closeEvent(QCloseEvent *event)

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

{

    if (maybeSave()) {

        writeSettings();

        event->accept();

    } else {

        event->ignore();

    }

}

//! [4]

//! [5]

void MainWindow::newFile()

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

{

    if (maybeSave()) {

        textEdit->clear();

        setCurrentFile("");

    }

}

//! [6]

//! [7]

void MainWindow::open()

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

{

    if (maybeSave()) {

        QString fileName = QFileDialog::getOpenFileName(this);

        if (!fileName.isEmpty())

            loadFile(fileName);

    }

}

//! [8]

//! [9]

bool MainWindow::save()

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

{

    if (curFile.isEmpty()) {

        return saveAs();

    } else {

        return saveFile(curFile);

    }

}

//! [10]

//! [11]

bool MainWindow::saveAs()

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

{

    QString fileName = QFileDialog::getSaveFileName(this);

    if (fileName.isEmpty())

        return false;

    return saveFile(fileName);

}

//! [12]

//! [13]

void MainWindow::about()

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

{

   QMessageBox::about(this, tr("About Application"),

            tr("The <b>Application</b> example demonstrates how to "

               "write modern GUI applications using Qt, with a menu bar, "

               "toolbars, and a status bar."));

}

//! [14]

//! [15]

void MainWindow::documentWasModified()

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

{

    setWindowModified(textEdit->document()->isModified());

}

//! [16]

//! [17]

void MainWindow::createActions()

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

{

    newAct = new QAction(QIcon(":/images/new.png"), tr("&New"), this);

    newAct->setShortcuts(QKeySequence::New);

    newAct->setStatusTip(tr("Create a new file"));

    connect(newAct, SIGNAL(triggered()), this, SLOT(newFile()));

//! [19]

    openAct = new QAction(QIcon(":/images/open.png"), tr("&Open..."), this);

    openAct->setShortcuts(QKeySequence::Open);

    openAct->setStatusTip(tr("Open an existing file"));

    connect(openAct, SIGNAL(triggered()), this, SLOT(open()));

//! [18] //! [19]

    saveAct = new QAction(QIcon(":/images/save.png"), tr("&Save"), this);

    saveAct->setShortcuts(QKeySequence::Save);

    saveAct->setStatusTip(tr("Save the document to disk"));

    connect(saveAct, SIGNAL(triggered()), this, SLOT(save()));

    saveAsAct = new QAction(tr("Save &As..."), this);

    saveAsAct->setShortcuts(QKeySequence::SaveAs);

    saveAsAct->setStatusTip(tr("Save the document under a new name"));

    connect(saveAsAct, SIGNAL(triggered()), this, SLOT(saveAs()));

//! [20]

    exitAct = new QAction(tr("E&xit"), this);

    exitAct->setShortcuts(QKeySequence::Quit);

//! [20]

    exitAct->setStatusTip(tr("Exit the application"));

    connect(exitAct, SIGNAL(triggered()), this, SLOT(close()));

//! [21]

    cutAct = new QAction(QIcon(":/images/cut.png"), tr("Cu&t"), this);

//! [21]

    cutAct->setShortcuts(QKeySequence::Cut);

    cutAct->setStatusTip(tr("Cut the current selection's contents to the "

                            "clipboard"));

    connect(cutAct, SIGNAL(triggered()), textEdit, SLOT(cut()));

    copyAct = new QAction(QIcon(":/images/copy.png"), tr("&Copy"), this);

    copyAct->setShortcuts(QKeySequence::Copy);

    copyAct->setStatusTip(tr("Copy the current selection's contents to the "

                             "clipboard"));

    connect(copyAct, SIGNAL(triggered()), textEdit, SLOT(copy()));

    pasteAct = new QAction(QIcon(":/images/paste.png"), tr("&Paste"), this);

    pasteAct->setShortcuts(QKeySequence::Paste);

    pasteAct->setStatusTip(tr("Paste the clipboard's contents into the current "

                              "selection"));

    connect(pasteAct, SIGNAL(triggered()), textEdit, SLOT(paste()));

    aboutAct = new QAction(tr("&About"), this);

    aboutAct->setStatusTip(tr("Show the application's About box"));

    connect(aboutAct, SIGNAL(triggered()), this, SLOT(about()));

//! [22]

    aboutQtAct = new QAction(tr("About &Qt"), this);

    aboutQtAct->setStatusTip(tr("Show the Qt library's About box"));

    connect(aboutQtAct, SIGNAL(triggered()), qApp, SLOT(aboutQt()));

//! [22]

//! [23]

    cutAct->setEnabled(false);

//! [23] //! [24]

    copyAct->setEnabled(false);

    connect(textEdit, SIGNAL(copyAvailable(bool)),

            cutAct, SLOT(setEnabled(bool)));

    connect(textEdit, SIGNAL(copyAvailable(bool)),

            copyAct, SLOT(setEnabled(bool)));

}

//! [24]

//! [25] //! [26]

void MainWindow::createMenus()

//! [25] //! [27]

{

    fileMenu = menuBar()->addMenu(tr("&File"));

    fileMenu->addAction(newAct);

//! [28]

    fileMenu->addAction(openAct);

//! [28]

    fileMenu->addAction(saveAct);

//! [26]

    fileMenu->addAction(saveAsAct);

    fileMenu->addSeparator();

    fileMenu->addAction(exitAct);

    editMenu = menuBar()->addMenu(tr("&Edit"));

    editMenu->addAction(cutAct);

    editMenu->addAction(copyAct);

    editMenu->addAction(pasteAct);

    menuBar()->addSeparator();

    helpMenu = menuBar()->addMenu(tr("&Help"));

    helpMenu->addAction(aboutAct);

    helpMenu->addAction(aboutQtAct);

}

//! [27]

//! [29] //! [30]

void MainWindow::createToolBars()

{

    fileToolBar = addToolBar(tr("File"));

    fileToolBar->addAction(newAct);

//! [29] //! [31]

    fileToolBar->addAction(openAct);

//! [31]

    fileToolBar->addAction(saveAct);

    editToolBar = addToolBar(tr("Edit"));

    editToolBar->addAction(cutAct);

    editToolBar->addAction(copyAct);

    editToolBar->addAction(pasteAct);

}

//! [30]

//! [32]

void MainWindow::createStatusBar()

//! [32] //! [33]

{

    statusBar()->showMessage(tr("Ready"));

}

//! [33]

//! [34] //! [35]

void MainWindow::readSettings()

//! [34] //! [36]

{

    QSettings settings("Trolltech", "Application Example");

    QPoint pos = settings.value("pos", QPoint(200, 200)).toPoint();

    QSize size = settings.value("size", QSize(400, 400)).toSize();

    resize(size);

    move(pos);

}

//! [35] //! [36]

//! [37] //! [38]

void MainWindow::writeSettings()

//! [37] //! [39]

{

    QSettings settings("Trolltech", "Application Example");

    settings.setValue("pos", pos());

    settings.setValue("size", size());

}

//! [38] //! [39]

//! [40]

bool MainWindow::maybeSave()

//! [40] //! [41]

{

    if (textEdit->document()->isModified()) {

        QMessageBox::StandardButton ret;

        ret = QMessageBox::warning(this, tr("Application"),

                     tr("The document has been modified.\n"

                        "Do you want to save your changes?"),

                     QMessageBox::Save | QMessageBox::Discard | QMessageBox::Cancel);

        if (ret == QMessageBox::Save)

            return save();

        else if (ret == QMessageBox::Cancel)

            return false;

    }

    return true;

}

//! [41]

//! [42]

void MainWindow::loadFile(const QString &fileName)

//! [42] //! [43]

{

    QFile file(fileName);

    if (!file.open(QFile::ReadOnly | QFile::Text)) {

        QMessageBox::warning(this, tr("Application"),

                             tr("Cannot read file %1:\n%2.")

                             .arg(fileName)

                             .arg(file.errorString()));

        return;

    }

    QTextStream in(&file);

#ifndef QT_NO_CURSOR

    QApplication::setOverrideCursor(Qt::WaitCursor);

#endif

    textEdit->setPlainText(in.readAll());

#ifndef QT_NO_CURSOR

    QApplication::restoreOverrideCursor();

#endif

    setCurrentFile(fileName);

    statusBar()->showMessage(tr("File loaded"), 2000);

}

//! [43]

//! [44]

bool MainWindow::saveFile(const QString &fileName)

//! [44] //! [45]

{

    QFile file(fileName);

    if (!file.open(QFile::WriteOnly | QFile::Text)) {

        QMessageBox::warning(this, tr("Application"),

                             tr("Cannot write file %1:\n%2.")

                             .arg(fileName)

                             .arg(file.errorString()));

        return false;

    }

    QTextStream out(&file);

#ifndef QT_NO_CURSOR

    QApplication::setOverrideCursor(Qt::WaitCursor);

#endif

    out << textEdit->toPlainText();

#ifndef QT_NO_CURSOR

    QApplication::restoreOverrideCursor();

#endif

    setCurrentFile(fileName);

    statusBar()->showMessage(tr("File saved"), 2000);

    return true;

}

//! [45]

//! [46]

void MainWindow::setCurrentFile(const QString &fileName)

//! [46] //! [47]

{

    curFile = fileName;

    textEdit->document()->setModified(false);

    setWindowModified(false);

    QString shownName = curFile;

    if (curFile.isEmpty())

        shownName = "untitled.txt";

    setWindowFilePath(shownName);

}

//! [47]

//! [48]

QString MainWindow::strippedName(const QString &fullFileName)

//! [48] //! [49]

{

    return QFileInfo(fullFileName).fileName();

}

//! [49]