mainwindow.cpp Example File | Qt Assistant Manual

- Qt 5.4
- Qt Assistant Manual
- Simple Text Viewer Example
- mainwindow.cpp Example File
- Qt 5.4.2 Reference Documentation

# mainwindow.cpp Example File

simpletextviewer/mainwindow.cpp

    /****************************************************************************
    **
    ** Copyright (C) 2013 Digia Plc and/or its subsidiary(-ies).
    ** Contact: http://www.qt-project.org/legal
    **
    ** 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 Digia Plc 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."
    **
    ** $QT_END_LICENSE$
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    ****************************************************************************/

    #include <QtCore/QLibraryInfo>
    #include <QtWidgets/QApplication>
    #include <QtWidgets/QAction>
    #include <QtWidgets/QMenu>
    #include <QtWidgets/QMenuBar>
    #include <QtWidgets/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("/assistant/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);
    }