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# remotecontrol.cpp Example File
help/remotecontrol/remotecontrol.cpp

     /****************************************************************************
     **
     ** Copyright (C) 2010 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.
     **
     ** $QT_BEGIN_LICENSE:LGPL$
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     ** Licensees holding valid Qt Commercial licenses may use this file in
     ** accordance with the Qt Commercial License Agreement provided with the
     ** Software or, alternatively, in accordance with the terms contained in
     ** a written agreement between you and Nokia.
     **
     ** GNU Lesser General Public License Usage
     ** Alternatively, this file may be used under the terms of the GNU Lesser
     ** General Public License version 2.1 as published by the Free Software
     ** Foundation and appearing in the file LICENSE.LGPL included in the
     ** packaging of this file.  Please review the following information to
     ** ensure the GNU Lesser General Public License version 2.1 requirements
     ** will be met: http://www.gnu.org/licenses/old-licenses/lgpl-2.1.html.
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     ** rights.  These rights are described in the Nokia Qt LGPL Exception
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     **
     ** GNU General Public License Usage
     ** Alternatively, this file may be used under the terms of the GNU
     ** General Public License version 3.0 as published by the Free Software
     ** Foundation and appearing in the file LICENSE.GPL included in the
     ** packaging of this file.  Please review the following information to
     ** ensure the GNU General Public License version 3.0 requirements will be
     ** met: http://www.gnu.org/copyleft/gpl.html.
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     #include <QtCore/QDir>
     #include <QtCore/QProcess>
     #include <QtCore/QTextStream>
     #include <QtCore/QLibraryInfo>

     #include <QtGui/QMessageBox>

     #include "remotecontrol.h"

     RemoteControl::RemoteControl(QWidget *parent, Qt::WFlags 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://com.trolltech.qt.")
                          << (QT_VERSION >> 16) << ((QT_VERSION >> 8) & 0xFF)
                          << (QT_VERSION & 0xFF)
                          << QLatin1String("/qdoc/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() + '\0');
     }

     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);
     }