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

        /****************************************************************************
        **
        ** Copyright (C) 2005-2005 Trolltech AS. 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
    **
    ** If you are unsure which license is appropriate for your use, please
    ** review the following information:
    ** http://www.trolltech.com/products/qt/licensing.html or contact the
    ** sales department at sales@trolltech.com.
        **
        ** 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"

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

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

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

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

            if (fileName.isNull())
                fileName = QFileDialog::getOpenFileName(this,
                    tr("Open File"), "", "qmake Files (*.pro *.prf *.pri)");

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

        void MainWindow::setupEditor()
        {
            QTextCharFormat variableFormat;
            variableFormat.setFontWeight(QFont::Bold);
            variableFormat.setForeground(Qt::blue);
            highlighter.addMapping("\\b[A-Z_]+\\b", variableFormat);

            QTextCharFormat singleLineCommentFormat;
            singleLineCommentFormat.setBackground(QColor("#77ff77"));
            highlighter.addMapping("#[^\n]*", singleLineCommentFormat);

            QTextCharFormat quotationFormat;
            quotationFormat.setBackground(Qt::cyan);
            quotationFormat.setForeground(Qt::blue);
            highlighter.addMapping("\".*\"", quotationFormat);

            QTextCharFormat functionFormat;
            functionFormat.setFontItalic(true);
            functionFormat.setForeground(Qt::blue);
            highlighter.addMapping("\\b[a-z0-9_]+\\(.*\\)", functionFormat);

            QFont font;
            font.setFamily("Courier");
            font.setFixedPitch(true);
            font.setPointSize(10);

            editor = new QTextEdit;
            editor->setFont(font);
            highlighter.addToDocument(editor->document());
        }

        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")));
        }