Added App::PropertyArea (same as PropertyLength but uses Area units)

src/App/Application.cpp

@@ -1096,6 +1096,7 @@ void Application::initTypes(void)
     App ::PropertyAngle             ::init();
     App ::PropertyDistance          ::init();
     App ::PropertyLength            ::init();
+    App ::PropertyArea              ::init();
     App ::PropertySpeed             ::init();
     App ::PropertyAcceleration      ::init();
     App ::PropertyForce             ::init();

src/App/PropertyUnits.cpp

@@ -232,6 +232,19 @@ PropertyLength::PropertyLength()
     setConstraints(&LengthStandard);
 }
 
+//**************************************************************************
+//**************************************************************************
+// PropertyArea
+//++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++++
+
+TYPESYSTEM_SOURCE(App::PropertyArea, App::PropertyQuantityConstraint);
+
+PropertyArea::PropertyArea()
+{
+    setUnit(Base::Unit::Area);
+    setConstraints(&LengthStandard);
+}
+
 //**************************************************************************
 //**************************************************************************
 // PropertyAngle

src/App/PropertyUnits.h

@@ -138,6 +138,18 @@ public:
     virtual ~PropertyLength(){}
 };
 
+/** Area property
+ * This is a property for representing areas. It is basically a float
+ * property which must not be negative. On the Gui it has a quantity like m^2 or mm^2.
+ */
+class AppExport PropertyArea : public PropertyQuantityConstraint
+{
+    TYPESYSTEM_HEADER();
+public:
+    PropertyArea(void);
+    virtual ~PropertyArea(){}
+};
+
 /** Angle property
  * This is a property for representing angles. It basicly a float
  * property. On the Gui it has a quantity like RAD.