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qt4-doc-4.6.3-0.2mdv2010.2.i586.rpm

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  <title>Qt 4.6: mainwindow.cpp Example File (richtext/syntaxhighlighter/mainwindow.cpp)</title>
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 #include &lt;QtGui&gt;

 #include &quot;mainwindow.h&quot;

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

     setCentralWidget(editor);
     setWindowTitle(tr(&quot;Syntax Highlighter&quot;));
 }

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

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

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

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

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

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

     editor = new QTextEdit;
     editor-&gt;setFont(font);

     highlighter = new Highlighter(editor-&gt;document());

     QFile file(&quot;mainwindow.h&quot;);
     if (file.open(QFile::ReadOnly | QFile::Text))
         editor-&gt;setPlainText(file.readAll());
 }

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

     fileMenu-&gt;addAction(tr(&quot;&amp;New&quot;), this, SLOT(newFile()),
                         QKeySequence::New);

     fileMenu-&gt;addAction(tr(&quot;&amp;Open...&quot;), this, SLOT(openFile()),
                         QKeySequence::Open);

     fileMenu-&gt;addAction(tr(&quot;E&amp;xit&quot;), qApp, SLOT(quit()),
                         QKeySequence::Quit);
 }

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

     helpMenu-&gt;addAction(tr(&quot;&amp;About&quot;), this, SLOT(about()));
     helpMenu-&gt;addAction(tr(&quot;About &amp;Qt&quot;), qApp, SLOT(aboutQt()));
 }</pre>
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