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

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        **
        ** This file is part of the documentation of the Qt Toolkit.
        **
        ** This file may be distributed under the terms of the Q Public License
    ** as defined by Trolltech AS of Norway and appearing in the file
    ** LICENSE.QPL included in the packaging of this file.
    **
    ** This file may be distributed and/or modified under the terms of the
    ** GNU General Public License version 2 as published by the Free Software
    ** Foundation and appearing in the file LICENSE.GPL included in the
    ** packaging of this file.
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        #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 defaultFormat;
            defaultFormat.setFontFamily("Courier");
            defaultFormat.setFontPointSize(10);

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

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

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

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

            editor = new QTextEdit;
            editor->setFont(defaultFormat.font());
            editor->document()->setDefaultFont(defaultFormat.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")));
        }