Added a ComboBoxDelegate for the new "type" role.

widgets/controls/comboboxdelegate.cpp

@@ -0,0 +1,57 @@
+#include "comboboxdelegate.h"
+
+#include <QComboBox>
+#include <QStringListModel>
+#include "model/metadata.h"
+
+ComboboxDelegate::ComboboxDelegate(const QStringList items, QObject* parent)
+    : QStyledItemDelegate(parent)
+    , m_types(new QStringListModel(items)) {}
+
+void ComboboxDelegate::paint(QPainter* painter,
+                             const QStyleOptionViewItem& option,
+                             const QModelIndex& index) const {
+  QStyledItemDelegate::paint(painter, option, index);
+}
+
+QSize ComboboxDelegate::sizeHint(const QStyleOptionViewItem& option,
+                                 const QModelIndex& index) const {
+  return QStyledItemDelegate::sizeHint(option, index);
+}
+
+QWidget* ComboboxDelegate::createEditor(QWidget* parent,
+                                        const QStyleOptionViewItem& /*option*/,
+                                        const QModelIndex& /*index*/) const {
+  QComboBox* editor = new QComboBox(parent);
+  editor->setModel(m_types);
+  return editor;
+  // return QStyledItemDelegate::createEditor(parent, option, index);
+}
+
+void ComboboxDelegate::setEditorData(QWidget* editor, const QModelIndex& index) const {
+  /// Get the value via index of the Model
+  const QAbstractItemModel* localModel = index.model();
+  const QString headerText = localModel->headerData(index.column(), Qt::Horizontal).toString();
+
+  const UserRoles role = GET_ROLE_FOR_COLUMN(index.column());
+  const bool isType    = TYPE_ROLES.contains(role);
+  /// Put the value into the SpinBox
+  if (isType) {
+    const QString valueString = index.model()->data(index, TypeRole).toString();
+    int value                 = TYPES.indexOf(valueString);
+
+    QComboBox* combobox = static_cast<QComboBox*>(editor);
+    combobox->setCurrentIndex(value);
+    // QStyledItemDelegate::setEditorData(editor, index);
+  } else {
+    qCritical() << "Could not find the correct type role for index:" << index << "!!!";
+    QComboBox* combobox = static_cast<QComboBox*>(editor);
+    combobox->setCurrentIndex(-1);
+  }
+}
+
+void ComboboxDelegate::setModelData(QWidget* editor,
+                                    QAbstractItemModel* model,
+                                    const QModelIndex& index) const {
+  QStyledItemDelegate::setModelData(editor, model, index);
+}

widgets/controls/comboboxdelegate.h

@@ -0,0 +1,31 @@
+#ifndef COMBOBOXDELEGATE_H
+#define COMBOBOXDELEGATE_H
+
+#include <QStyledItemDelegate>
+class QStringListModel;
+
+class ComboboxDelegate : public QStyledItemDelegate {
+  // TODO move source code files into subfolder "widgets/delegate"
+  Q_OBJECT
+ public:
+  explicit ComboboxDelegate(const QStringList items, QObject* parent = nullptr);
+
+  /// QAbstractItemDelegate interface
+ public:
+  void paint(QPainter* painter,
+             const QStyleOptionViewItem& option,
+             const QModelIndex& index) const override;
+  QSize sizeHint(const QStyleOptionViewItem& option, const QModelIndex& index) const override;
+  QWidget* createEditor(QWidget* parent,
+                        const QStyleOptionViewItem& option,
+                        const QModelIndex&) const override;
+  void setEditorData(QWidget* editor, const QModelIndex& index) const override;
+  void setModelData(QWidget* editor,
+                    QAbstractItemModel* model,
+                    const QModelIndex& index) const override;
+
+ private:
+  QStringListModel* m_types = nullptr;
+};
+
+#endif  // COMBOBOXDELEGATE_H