setting Datum Line size manually

src/Mod/PartDesign/App/DatumLine.cpp

@@ -35,10 +35,23 @@
 using namespace PartDesign;
 using namespace Attacher;
 
+// ============================================================================
+
+const char* Line::ResizeModeEnums[]= {"Automatic","Manual",NULL};
+
 PROPERTY_SOURCE(PartDesign::Line, Part::Datum)
 
 Line::Line()
 {
+    // These properties are only relevant for the visual appearance.
+    // Since they are getting changed from within its view provider
+    // their type is set to "Output" to avoid that they are marked as
+    // touched all the time.
+    ADD_PROPERTY_TYPE(ResizeMode,(static_cast<long>(0)), "Size", App::Prop_Output, "Automatic or manual resizing");
+    ResizeMode.setEnums(ResizeModeEnums);
+    ADD_PROPERTY_TYPE(Length,(20), "Size", App::Prop_Output, "Length of the line");
+    Length.setReadOnly(true);
+
     this->setAttacher(new AttachEngineLine);
     // Create a shape, which will be used by the Sketcher. Them main function is to avoid a dependency of
     // Sketcher on the PartDesign module
@@ -63,3 +76,16 @@ Base::Vector3d Line::getDirection() const
     rot.multVec(Base::Vector3d(0,0,1), dir);
     return dir;
 }
+
+void Line::onChanged(const App::Property *prop)
+{
+    if (prop == &ResizeMode) {
+        if (ResizeMode.getValue() == 0) {
+            Length.setReadOnly(true);
+        }
+        else {
+            Length.setReadOnly(false);
+        }
+    }
+    Datum::onChanged(prop);
+}