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# mainwindow.cpp Example File
assistant/simpletextviewer/mainwindow.cpp

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     #include <QtGui>

     #include "mainwindow.h"
     #include "findfiledialog.h"

     MainWindow::MainWindow()
     {
         textViewer = new QTextEdit;
         textViewer->setReadOnly(true);
         QFile file("documentation/intro.html");
         if (file.open(QIODevice::ReadOnly))
             textViewer->setHtml(file.readAll());

         setCentralWidget(textViewer);

         createActions();
         createMenus();

         initializeAssistant();

         setWindowTitle(tr("Simple Text Viewer"));
         resize(750, 400);
     }

     void MainWindow::closeEvent(QCloseEvent *)
     {
         if (assistantClient)
             assistantClient->closeAssistant();
     }

     void MainWindow::about()
     {
         QMessageBox::about(this, tr("About Simple Text Viewer"),
                              tr("This example demonstrates how to use\n" \
                                 "Qt Assistant as help system for your\n" \
                                 "own application."));
     }

     void MainWindow::assistant()
     {
         assistantClient->showPage(QLibraryInfo::location(QLibraryInfo::ExamplesPath) +
                                                   QDir::separator() +
                                                   "assistant/simpletextviewer/documentation/index.html");
     }

     void MainWindow::open()
     {
         FindFileDialog dialog(textViewer, assistantClient);
         dialog.exec();
     }

     void MainWindow::createActions()
     {
         assistantAct = new QAction(tr("Help Contents"), this);
         assistantAct->setShortcut(tr("F1"));
         connect(assistantAct, SIGNAL(triggered()), this, SLOT(assistant()));

         openAct = new QAction(tr("&Open..."), this);
         openAct->setShortcut(tr("Ctrl+O"));
         connect(openAct, SIGNAL(triggered()), this, SLOT(open()));

         clearAct = new QAction(tr("&Clear"), this);
         clearAct->setShortcut(tr("Ctrl+C"));
         connect(clearAct, SIGNAL(triggered()), textViewer, SLOT(clear()));

         exitAct = new QAction(tr("E&xit"), this);
         exitAct->setShortcut(tr("Ctrl+Q"));
         connect(exitAct, SIGNAL(triggered()), this, SLOT(close()));

         aboutAct = new QAction(tr("&About"), this);
         connect(aboutAct, SIGNAL(triggered()), this, SLOT(about()));

         aboutQtAct = new QAction(tr("About &Qt"), this);
         connect(aboutQtAct, SIGNAL(triggered()), qApp, SLOT(aboutQt()));
     }

     void MainWindow::createMenus()
     {
         fileMenu = new QMenu(tr("&File"), this);
         fileMenu->addAction(openAct);
         fileMenu->addAction(clearAct);
         fileMenu->addSeparator();
         fileMenu->addAction(exitAct);

         helpMenu = new QMenu(tr("&Help"), this);
         helpMenu->addAction(assistantAct);
         helpMenu->addSeparator();
         helpMenu->addAction(aboutAct);
         helpMenu->addAction(aboutQtAct);

         menuBar()->addMenu(fileMenu);
         menuBar()->addMenu(helpMenu);
     }

     void MainWindow::initializeAssistant()
     {
         assistantClient = new QAssistantClient(QLibraryInfo::location(QLibraryInfo::BinariesPath), this);

         QStringList arguments;
         arguments << "-profile" << QString("documentation") + QDir::separator() + QString("simpletextviewer.adp");
         assistantClient->setArguments(arguments);
     }