- Qt 5.5
- Qt Assistant Manual
- Remote Control Example
- remotecontrol.cpp Example File
- Qt 5.5.1 Reference Documentation

# remotecontrol.cpp Example File

remotecontrol/remotecontrol.cpp

    /****************************************************************************
    **
    ** Copyright (C) 2015 The Qt Company Ltd.
    ** Contact: http://www.qt.io/licensing/
    **
    ** 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 The Qt Company Ltd 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/QDir>
    #include <QtCore/QProcess>
    #include <QtCore/QTextStream>
    #include <QtCore/QLibraryInfo>

    #include <QtWidgets/QMessageBox>

    #include "remotecontrol.h"

    RemoteControl::RemoteControl(QWidget *parent, Qt::WindowFlags flags)
            : QMainWindow(parent, flags)
    {
        ui.setupUi(this);
        connect(ui.indexLineEdit, SIGNAL(returnPressed()),
            this, SLOT(on_indexButton_clicked()));
        connect(ui.identifierLineEdit, SIGNAL(returnPressed()),
            this, SLOT(on_identifierButton_clicked()));
        connect(ui.urlLineEdit, SIGNAL(returnPressed()),
            this, SLOT(on_urlButton_clicked()));

        QString rc;
        QTextStream(&rc) << QLatin1String("qthelp://org.qt-project.qtdoc.")
                         << (QT_VERSION >> 16) << ((QT_VERSION >> 8) & 0xFF)
                         << (QT_VERSION & 0xFF)
                         << QLatin1String("/qtdoc/index.html");

        ui.startUrlLineEdit->setText(rc);

        process = new QProcess(this);
        connect(process, SIGNAL(finished(int,QProcess::ExitStatus)),
            this, SLOT(helpViewerClosed()));
    }

    RemoteControl::~RemoteControl()
    {
        if (process->state() == QProcess::Running) {
            process->terminate();
            process->waitForFinished(3000);
        }
    }

    void RemoteControl::on_actionQuit_triggered()
    {
        close();
    }

    void RemoteControl::on_launchButton_clicked()
    {
        if (process->state() == QProcess::Running)
            return;

        QString app = QLibraryInfo::location(QLibraryInfo::BinariesPath) + QDir::separator();
    #if !defined(Q_OS_MAC)
        app += QLatin1String("assistant");
    #else
        app += QLatin1String("Assistant.app/Contents/MacOS/Assistant");
    #endif

        ui.contentsCheckBox->setChecked(true);
        ui.indexCheckBox->setChecked(true);
        ui.bookmarksCheckBox->setChecked(true);

        QStringList args;
        args << QLatin1String("-enableRemoteControl");
        process->start(app, args);
        if (!process->waitForStarted()) {
            QMessageBox::critical(this, tr("Remote Control"),
                tr("Could not start Qt Assistant from %1.").arg(app));
            return;
        }

        if (!ui.startUrlLineEdit->text().isEmpty())
            sendCommand(QLatin1String("SetSource ")
                + ui.startUrlLineEdit->text());

        ui.launchButton->setEnabled(false);
        ui.startUrlLineEdit->setEnabled(false);
        ui.actionGroupBox->setEnabled(true);
    }

    void RemoteControl::sendCommand(const QString &cmd)
    {
        if (process->state() != QProcess::Running)
            return;
        process->write(cmd.toLocal8Bit() + '\n');
    }

    void RemoteControl::on_indexButton_clicked()
    {
        sendCommand(QLatin1String("ActivateKeyword ")
            + ui.indexLineEdit->text());
    }

    void RemoteControl::on_identifierButton_clicked()
    {
        sendCommand(QLatin1String("ActivateIdentifier ")
            + ui.identifierLineEdit->text());
    }

    void RemoteControl::on_urlButton_clicked()
    {
        sendCommand(QLatin1String("SetSource ")
            + ui.urlLineEdit->text());
    }

    void RemoteControl::on_syncContentsButton_clicked()
    {
        sendCommand(QLatin1String("SyncContents"));
    }

    void RemoteControl::on_contentsCheckBox_toggled(bool checked)
    {
        sendCommand(checked ?
            QLatin1String("Show Contents") : QLatin1String("Hide Contents"));
    }

    void RemoteControl::on_indexCheckBox_toggled(bool checked)
    {
        sendCommand(checked ?
            QLatin1String("Show Index") : QLatin1String("Hide Index"));
    }

    void RemoteControl::on_bookmarksCheckBox_toggled(bool checked)
    {
        sendCommand(checked ?
            QLatin1String("Show Bookmarks") : QLatin1String("Hide Bookmarks"));
    }

    void RemoteControl::helpViewerClosed()
    {
        ui.launchButton->setEnabled(true);
        ui.startUrlLineEdit->setEnabled(true);
        ui.actionGroupBox->setEnabled(false);
    }