Qt Reference Documentation

# mainwindow.cpp Example File

help/simpletextviewer/mainwindow.cpp

     /****************************************************************************
     **
     ** Copyright (C) 2011 Nokia Corporation and/or its subsidiary(-ies).
     ** All rights reserved.
     ** Contact: Nokia Corporation (qt-info@nokia.com)
     **
     ** This file is part of the examples of the Qt Toolkit.
     **
     ** $QT_BEGIN_LICENSE:BSD$
     ** You may use this file under the terms of the BSD license as follows:
     **
     ** "Redistribution and use in source and binary forms, with or without
     ** modification, are permitted provided that the following conditions are
     ** met:
     **   * Redistributions of source code must retain the above copyright
     **     notice, this list of conditions and the following disclaimer.
     **   * Redistributions in binary form must reproduce the above copyright
     **     notice, this list of conditions and the following disclaimer in
     **     the documentation and/or other materials provided with the
     **     distribution.
     **   * Neither the name of Nokia Corporation and its Subsidiary(-ies) nor
     **     the names of its contributors may be used to endorse or promote
     **     products derived from this software without specific prior written
     **     permission.
     **
     ** THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
     ** "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
     ** LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
     ** A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
     ** OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
     ** SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT
     ** LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE,
     ** DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY
     ** THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT
     ** (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE
     ** OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE."
     ** $QT_END_LICENSE$
     **
     ****************************************************************************/

     #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(QKeySequence::HelpContents);
         connect(assistantAct, SIGNAL(triggered()), this, SLOT(showDocumentation()));

         openAct = new QAction(tr("&Open..."), this);
         openAct->setShortcut(QKeySequence::Open);
         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->setShortcuts(QKeySequence::Quit);
         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);
     }