remotecontrol.cpp Example File

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  ** This file is part of the examples of the Qt Toolkit.
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  #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);
  }