Qt 5.7 | Qt Assistant Manual | Remote Control Example | remotecontrol.cpp Example File

Qt 5.7.1 Reference Documentation

# remotecontrol.cpp Example File

remotecontrol/remotecontrol.cpp

      /****************************************************************************
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      ** This file is part of the examples of the Qt Toolkit.
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      ** Alternatively, you may use this file under the terms of the BSD license
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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);
      }