Simple CoAP Client

 // Copyright (C) 2019 The Qt Company Ltd.
 // SPDX-License-Identifier: LicenseRef-Qt-Commercial OR BSD-3-Clause

 #include "optiondialog.h"
 #include "ui_optiondialog.h"

 OptionDialog::OptionDialog(const QList<QCoapOption> &options, QWidget *parent) :
     QDialog(parent),
     ui(new Ui::OptionDialog),
     m_options(options)
 {
     ui->setupUi(this);
     connect(ui->tableWidget, &QTableWidget::itemSelectionChanged, this, [this]() {
         const auto selection = ui->tableWidget->selectedItems();
         ui->removeButton->setEnabled(!selection.isEmpty());
     });

     fillOptions();
     applyOptionValues();

     auto header = ui->tableWidget->horizontalHeader();
     header->setSectionResizeMode(QHeaderView::Stretch);
 }

 OptionDialog::~OptionDialog()
 {
     delete ui;
 }

 QList<QCoapOption> OptionDialog::options() const
 {
     return m_options;
 }

 void OptionDialog::on_addButton_clicked()
 {
     const auto option =
             ui->optionComboBox->currentData(Qt::UserRole).value<QCoapOption::OptionName>();
     m_options.push_back(QCoapOption(option, ui->optionValueEdit->text()));

     addTableRow(ui->optionComboBox->currentText(), ui->optionValueEdit->text());
 }

 void OptionDialog::on_removeButton_clicked()
 {
     const auto idx = ui->tableWidget->currentRow();
     if (idx >= 0 && idx < ui->tableWidget->rowCount()) {
         ui->tableWidget->removeRow(idx);
         m_options.removeAt(idx);
     }
 }

 void OptionDialog::on_clearButton_clicked()
 {
     m_options.clear();
     ui->tableWidget->setRowCount(0);
 }

 void OptionDialog::fillOptions()
 {
     ui->tableWidget->setHorizontalHeaderLabels({tr("Name"), tr("Value")});
     ui->optionComboBox->addItem(tr("None"), QCoapOption::Invalid);
     ui->optionComboBox->addItem(tr("Block1"), QCoapOption::Block1);
     ui->optionComboBox->addItem(tr("Block2"), QCoapOption::Block2);
     ui->optionComboBox->addItem(tr("Content-Format"), QCoapOption::ContentFormat);
     ui->optionComboBox->addItem(tr("If-Match"), QCoapOption::IfMatch);
     ui->optionComboBox->addItem(tr("If-None-Match"), QCoapOption::IfNoneMatch);
     ui->optionComboBox->addItem(tr("Location-Path"), QCoapOption::LocationPath);
     ui->optionComboBox->addItem(tr("Location-Query"), QCoapOption::LocationQuery);
     ui->optionComboBox->addItem(tr("Max-Age"), QCoapOption::MaxAge);
     ui->optionComboBox->addItem(tr("Observe"), QCoapOption::Observe);
     ui->optionComboBox->addItem(tr("Proxy-Scheme"), QCoapOption::ProxyScheme);
     ui->optionComboBox->addItem(tr("Proxy-Uri"), QCoapOption::ProxyUri);
     ui->optionComboBox->addItem(tr("Size1"), QCoapOption::Size1);
     ui->optionComboBox->addItem(tr("Size2"), QCoapOption::Size2);
     ui->optionComboBox->addItem(tr("Uri-Host"), QCoapOption::UriHost);
     ui->optionComboBox->addItem(tr("Uri-Path"), QCoapOption::UriPath);
     ui->optionComboBox->addItem(tr("Uri-Port"), QCoapOption::UriPort);
     ui->optionComboBox->addItem(tr("Uri-Query"), QCoapOption::UriQuery);
 }

 void OptionDialog::applyOptionValues()
 {
     for (const auto &option : std::as_const(m_options)) {
         const int optionIndex = ui->optionComboBox->findData(option.name());
         if (optionIndex != -1)
             addTableRow(ui->optionComboBox->itemText(optionIndex), option.stringValue());
     }
 }

 void OptionDialog::addTableRow(const QString &name, const QString &value)
 {
     const auto rowCount = ui->tableWidget->rowCount();
     ui->tableWidget->insertRow(rowCount);

     QTableWidgetItem *optionItem = new QTableWidgetItem(name);
     optionItem->setFlags(optionItem->flags() ^ Qt::ItemIsEditable);
     ui->tableWidget->setItem(rowCount, 0, optionItem);

     QTableWidgetItem *valueItem = new QTableWidgetItem(value);
     valueItem->setFlags(valueItem->flags() ^ Qt::ItemIsEditable);
     ui->tableWidget->setItem(rowCount, 1, valueItem);
 }