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# mainwindow.cpp Example File
richtext/syntaxhighlighter/mainwindow.cpp

        /****************************************************************************
        **
        ** Copyright (C) 2005-2006 Trolltech ASA. All rights reserved.
        **
        ** This file is part of the documentation 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://www.trolltech.com/products/qt/opensource.html
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        ** review the following information:
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        ** WARRANTY OF DESIGN, MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE.
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        #include <QtGui>

        #include "mainwindow.h"

        MainWindow::MainWindow(QWidget *parent)
            : QMainWindow(parent)
        {
            setupFileMenu();
            setupHelpMenu();
            setupEditor();

            setCentralWidget(editor);
            setWindowTitle(tr("Syntax Highlighter"));
        }

        void MainWindow::about()
        {
            QMessageBox::about(this, tr("About Syntax Highlighter"),
                        tr("<p>The <b>Syntax Highlighter</b> example shows how " \
                           "to perform simple syntax highlighting by subclassing " \
                           "the QSyntaxHighlighter class and describing " \
                           "highlighting rules using regular expressions.</p>"));
        }

        void MainWindow::newFile()
        {
            editor->clear();
        }

        void MainWindow::openFile(const QString &path)
        {
            QString fileName = path;

            if (fileName.isNull())
                fileName = QFileDialog::getOpenFileName(this,
                    tr("Open File"), "", "C++ Files (*.cpp *.h)");

            if (!fileName.isEmpty()) {
                QFile file(fileName);
                if (file.open(QFile::ReadOnly | QFile::Text))
                    editor->setPlainText(file.readAll());
            }
        }

        void MainWindow::setupEditor()
        {
            QFont font;
            font.setFamily("Courier");
            font.setFixedPitch(true);
            font.setPointSize(10);

            editor = new QTextEdit;
            editor->setFont(font);

            highlighter = new Highlighter(editor->document());

            QFile file("mainwindow.h");
            if (file.open(QFile::ReadOnly | QFile::Text))
                editor->setPlainText(file.readAll());
        }

        void MainWindow::setupFileMenu()
        {
            QMenu *fileMenu = new QMenu(tr("&File"), this);
            menuBar()->addMenu(fileMenu);

            fileMenu->addAction(tr("&New"), this, SLOT(newFile()),
                                QKeySequence(tr("Ctrl+N",
                                                "File|New")));
            fileMenu->addAction(tr("&Open..."), this, SLOT(openFile()),
                                QKeySequence(tr("Ctrl+O",
                                                "File|Open")));
            fileMenu->addAction(tr("E&xit"), qApp, SLOT(quit()),
                                QKeySequence(tr("Ctrl+Q",
                                                "File|Exit")));
        }

        void MainWindow::setupHelpMenu()
        {
            QMenu *helpMenu = new QMenu(tr("&Help"), this);
            menuBar()->addMenu(helpMenu);

            helpMenu->addAction(tr("&About"), this, SLOT(about()));
            helpMenu->addAction(tr("About &Qt"), qApp, SLOT(aboutQt()));
        }