Using the new SpinBoxDelegate in int and double columns even if the cell is empty.

widgets/controls/spinboxdelegate.cpp

@@ -0,0 +1,69 @@
+#include "spinboxdelegate.h"
+
+#include <QSpinBox>
+
+#include "model/metadata.h"
+
+SpinboxDelegate::SpinboxDelegate(QObject* parent)
+    : QStyledItemDelegate(parent) {}
+
+void SpinboxDelegate::paint(QPainter* painter,
+                            const QStyleOptionViewItem& option,
+                            const QModelIndex& index) const {
+  QStyledItemDelegate::paint(painter, option, index);
+}
+
+QSize SpinboxDelegate::sizeHint(const QStyleOptionViewItem& option,
+                                const QModelIndex& index) const {
+  return QStyledItemDelegate::sizeHint(option, index);
+}
+
+QWidget* SpinboxDelegate::createEditor(QWidget* parent,
+                                       const QStyleOptionViewItem&  /*option*/,
+                                       const QModelIndex& index) const {
+  const QAbstractItemModel* localModel = index.model();
+  QString headerText = localModel->headerData(index.column(), Qt::Horizontal).toString();
+
+  const UserRoles role = GET_ROLE_FOR_COLUMN(index.column());
+  const bool isInt     = INT_ROLES.contains(role);
+  if (isInt) {
+    QSpinBox* editor = new QSpinBox(parent);
+    editor->setMinimum(0);
+    editor->setMaximum(23000);
+    return editor;
+  } else {
+    QDoubleSpinBox* editor = new QDoubleSpinBox(parent);
+    editor->setMinimum(0);
+    editor->setMaximum(23000);
+    return editor;
+  }
+  // return QStyledItemDelegate::createEditor(parent, option, index);
+}
+
+void SpinboxDelegate::setEditorData(QWidget* editor, const QModelIndex& index) const {
+  // Get the value via index of the Model
+  const QAbstractItemModel* localModel = index.model();
+  QString headerText = localModel->headerData(index.column(), Qt::Horizontal).toString();
+
+  const UserRoles role = GET_ROLE_FOR_COLUMN(index.column());
+  const bool isInt     = INT_ROLES.contains(role);
+  if (isInt) {
+    int value = index.model()->data(index, Qt::EditRole).toInt();
+    // Put the value into the SpinBox
+    QSpinBox* spinbox = static_cast<QSpinBox*>(editor);
+    spinbox->setValue(value);
+  } else {
+    // Put the value into the SpinBox
+    qreal value             = index.model()->data(index, Qt::EditRole).toReal();
+    QDoubleSpinBox* spinbox = static_cast<QDoubleSpinBox*>(editor);
+    spinbox->setValue(value);
+  }
+
+  // QStyledItemDelegate::setEditorData(editor, index);
+}
+
+void SpinboxDelegate::setModelData(QWidget* editor,
+                                   QAbstractItemModel* model,
+                                   const QModelIndex& index) const {
+  QStyledItemDelegate::setModelData(editor, model, index);
+}

widgets/controls/spinboxdelegate.h

@@ -0,0 +1,27 @@
+#ifndef SPINBOXDELEGATE_H
+#define SPINBOXDELEGATE_H
+
+#include <QStyledItemDelegate>
+
+class SpinboxDelegate : public QStyledItemDelegate {
+  // TODO move source code files into subfolder "widgets/delegate"
+  Q_OBJECT
+ public:
+  explicit SpinboxDelegate(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& index) const override;
+  void setEditorData(QWidget* editor, const QModelIndex& index) const override;
+  void setModelData(QWidget* editor,
+                    QAbstractItemModel* model,
+                    const QModelIndex& index) const override;
+};
+
+#endif  // SPINBOXDELEGATE_H