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** This file is part of the examples of the Qt Toolkit.
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#include <QtGui>

#include "mainwindow.h"

//! [0]
MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
{
    setupFileMenu();
    setupHelpMenu();
    setupEditor();

    QSplitter* sp=new QSplitter;
    sp->addWidget(editor);
    sp->addWidget(editor2);
    setCentralWidget(sp);
    setWindowTitle(tr("Syntax Highlighter"));
}
//! [0]

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());
    }
}

//! [1]
void MainWindow::setupEditor()
{
    QFont font;
    font.setFamily("Courier");
    font.setFixedPitch(true);
    font.setPointSize(10);

    editor = new QTextEdit;
    editor->setFont(font);
    connect (editor->document(), SIGNAL(contentsChange(int, int, int)), this, SLOT(contentsChange(int,int,int)));

    editor2 = new QTextEdit;
    editor2->setFont(font);
    connect (editor2->document(), SIGNAL(contentsChange(int, int, int)), this, SLOT(contentsChange_workaround(int,int,int)));

    QFile file("mainwindow.h");
    if (file.open(QFile::ReadOnly | QFile::Text))
    {
        editor->setPlainText(file.readAll());
        editor2->setPlainText(editor->document()->toPlainText());
    }
}
//! [1]

void MainWindow::contentsChange(int,int,int)
{
    editor->selectAll();
}

void MainWindow::contentsChange_workaround(int,int,int)
{
    QTextCursor cursor = editor2->textCursor();
    cursor.setPosition(0);
    cursor.movePosition(QTextCursor::End, QTextCursor::KeepAnchor);
    editor2->setTextCursor(cursor);
}

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

    fileMenu->addAction(tr("&New"), this, SLOT(newFile()),
                        QKeySequence::New);

    fileMenu->addAction(tr("&Open..."), this, SLOT(openFile()),
                        QKeySequence::Open);
                        
    fileMenu->addAction(tr("E&xit"), qApp, SLOT(quit()),
                        QKeySequence::Quit);
}

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()));
}
