docu; add convenience parameter

GUI/View/Tool/WidgetUtils.cpp

@@ -42,10 +42,15 @@ QSpinBox* GUI::Util::createSpinBox(QWidget* parent, const UIntDescriptor& d,
     return spinBox;
 }
 
-DoubleSpinBox* GUI::Util::createSpinBox(QFormLayout* parentLayout, const DoubleDescriptor& d)
+DoubleSpinBox* GUI::Util::createSpinBox(QFormLayout* parentLayout, const DoubleDescriptor& d,
+                                        std::function<void(double)> slot)
 {
     auto* sb = new DoubleSpinBox(parentLayout->parentWidget(), d);
     parentLayout->addRow(labelWithUnit(d.label, d.unit) + ":", sb);
+
+    if (slot)
+        QObject::connect(sb, &DoubleSpinBox::baseValueChanged, [=](int v) { slot(v); });
+
     return sb;
 }
 

GUI/View/Tool/WidgetUtils.h

@@ -91,8 +91,10 @@ QSpinBox* createSpinBox(QFormLayout* parentLayout, const UIntDescriptor& d);
 //!
 //! No connections to update the descriptor will be established! Therefore changes in the spin box
 //! will *not* be notified to the descriptor. The additional (and optional) slot can be used to be
-//! notified about a value change.
-DoubleSpinBox* createSpinBox(QFormLayout* parentLayout, const DoubleDescriptor& d);
+//! notified about a value change (the notified new value is in the base unit of the
+//! DoubleDescriptor).
+DoubleSpinBox* createSpinBox(QFormLayout* parentLayout, const DoubleDescriptor& d,
+                             std::function<void(double)> slot = nullptr);
 
 //! Create a label with an optional unit in brackets.
 //!