Added read-only 'expression' property to QunatitySpinBox and renamed 'boundTo' to 'binding'.

src/Gui/QuantitySpinBox.cpp

@@ -328,8 +328,18 @@ void QuantitySpinBox::setBoundToByName(const QString &qstr)
     }
 }
 
-void Gui::QuantitySpinBox::onChange() {
-    
+QString Gui::QuantitySpinBox::expressionText() const
+{
+    Q_D(const QuantitySpinBox);
+    if (isBound()) {
+        return QString::fromStdString(getExpressionString());
+    }
+    return QString();
+}
+
+
+void Gui::QuantitySpinBox::onChange()
+{
     Q_ASSERT(isBound());
     
     if (getExpression()) {

src/Gui/QuantitySpinBox.h

@@ -45,7 +45,8 @@ class GuiExport QuantitySpinBox : public QAbstractSpinBox, public ExpressionBind
     Q_PROPERTY(double singleStep READ singleStep WRITE setSingleStep)
     Q_PROPERTY(double rawValue READ rawValue WRITE setValue NOTIFY valueChanged)
     Q_PROPERTY(Base::Quantity value READ value WRITE setValue NOTIFY valueChanged USER true)
-    Q_PROPERTY(QString boundTo READ boundToName WRITE setBoundToByName)
+    Q_PROPERTY(QString binding READ boundToName WRITE setBoundToByName)
+    Q_PROPERTY(QString expression READ expressionText)
 
 public:
     using ExpressionBinding::apply;
@@ -95,6 +96,9 @@ public:
     /// Sets the path of the bound property
     void setBoundToByName(const QString &path);
 
+    /// Gets the expression as a string
+    QString expressionText() const;
+
     /// Set the number portion selected
     void selectNumber();