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# remotecontrol.cpp Example File

help/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 <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() + '\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);
     }