text: /****************************************************************************
  **
  ** Copyright (C) 2016 The Qt Company Ltd.
  ** Contact: https://www.qt.io/licensing/
  **
  ** This file is part of the documentation of the Qt Toolkit.
  **
  ** $QT_BEGIN_LICENSE:BSD$
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  ** accordance with the commercial license agreement provided with the
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  ** information use the contact form at https://www.qt.io/contact-us.
  **
  ** BSD License Usage
  ** Alternatively, 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:
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  **     notice, this list of conditions and the following disclaimer.
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  ****************************************************************************/
  
  //! [0]
  int ret = QMessageBox::warning(this, tr("My Application"),
                                 tr("The document has been modified.\n"
                                    "Do you want to save your changes?"),
                                 QMessageBox::Save | QMessageBox::Discard
                                 | QMessageBox::Cancel,
                                 QMessageBox::Save);
  //! [0]
  
  
  //! [1]
  QMessageBox msgBox;
  msgBox.setStandardButtons(QMessageBox::Yes | QMessageBox::No);
  switch (msgBox.exec()) {
  case QMessageBox::Yes:
      // yes was clicked
      break;
  case QMessageBox::No:
      // no was clicked
      break;
  default:
      // should never be reached
      break;
  }
  //! [1]
  
  
  //! [2]
  QMessageBox msgBox;
  QPushButton *connectButton = msgBox.addButton(tr("Connect"), QMessageBox::ActionRole);
  QPushButton *abortButton = msgBox.addButton(QMessageBox::Abort);
  
  msgBox.exec();
  
  if (msgBox.clickedButton() == connectButton) {
      // connect
  } else if (msgBox.clickedButton() == abortButton) {
      // abort
  }
  //! [2]
  
  
  //! [3]
  QMessageBox messageBox(this);
  QAbstractButton *disconnectButton =
        messageBox.addButton(tr("Disconnect"), QMessageBox::ActionRole);
  ...
  messageBox.exec();
  if (messageBox.clickedButton() == disconnectButton) {
      ...
  }
  //! [3]
  
  
  //! [4]
  #include <QApplication>
  #include <QMessageBox>
  
  int main(int argc, char *argv[])
  {
      QT_REQUIRE_VERSION(argc, argv, "4.0.2")
  
      QApplication app(argc, argv);
      ...
      return app.exec();
  }
  //! [4]
  
  //! [5]
  QMessageBox msgBox;
  msgBox.setText("The document has been modified.");
  msgBox.exec();
  //! [5]
  
  //! [6]
  QMessageBox msgBox;
  msgBox.setText("The document has been modified.");
  msgBox.setInformativeText("Do you want to save your changes?");
  msgBox.setStandardButtons(QMessageBox::Save | QMessageBox::Discard | QMessageBox::Cancel);
  msgBox.setDefaultButton(QMessageBox::Save);
  int ret = msgBox.exec();
  //! [6]
  
  //! [7]
  switch (ret) {
    case QMessageBox::Save:
        // Save was clicked
        break;
    case QMessageBox::Discard:
        // Don't Save was clicked
        break;
    case QMessageBox::Cancel:
        // Cancel was clicked
        break;
    default:
        // should never be reached
        break;
  }
  //! [7]
  
  //! [9]
  QMessageBox msgBox(this);
  msgBox.setText(tr("The document has been modified.\n"
                    "Do you want to save your changes?"));
  msgBox.setStandardButtons(QMessageBox::Save | QMessageBox::Discard
                            | QMessageBox::Cancel);
  msgBox.setDefaultButton(QMessageBox::Save);
  //! [9]
  