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")));
    }