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

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     #include <QtCore/QLibraryInfo>
     #include <QtGui/QApplication>
     #include <QtGui/QAction>
     #include <QtGui/QMenu>
     #include <QtGui/QMenuBar>
     #include <QtGui/QMessageBox>

     #include "mainwindow.h"
     #include "findfiledialog.h"
     #include "assistant.h"
     #include "textedit.h"

     // ![0]
     MainWindow::MainWindow()
     {
         assistant = new Assistant;
     // ![0]
         textViewer = new TextEdit;
         textViewer->setContents(QLibraryInfo::location(QLibraryInfo::ExamplesPath)
                 + QLatin1String("/help/simpletextviewer/documentation/intro.html"));
         setCentralWidget(textViewer);

         createActions();
         createMenus();

         setWindowTitle(tr("Simple Text Viewer"));
         resize(750, 400);
     // ![1]
     }

     void MainWindow::closeEvent(QCloseEvent *)
     {
         delete assistant;
     }

     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::showDocumentation()
     {
         assistant->showDocumentation("index.html");
     }

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

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

         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);
     }