+ prepare ViewProvider2DObject to read in GridSize from old projects

src/Mod/Part/Gui/ViewProvider2DObject.cpp

@@ -36,7 +36,9 @@
 #endif
 
 /// Here the FreeCAD includes sorted by Base,App,Gui......
+#include <Base/Console.h>
 #include <Base/Parameter.h>
+#include <Base/Reader.h>
 #include <Base/ViewProj.h>
 #include <App/Application.h>
 #include <Gui/SoFCBoundingBox.h>
@@ -232,6 +234,56 @@ void ViewProvider2DObject::onChanged(const App::Property* prop)
     }
 }
 
+void ViewProvider2DObject::Restore(Base::XMLReader &reader)
+{
+    reader.readElement("Properties");
+    int Cnt = reader.getAttributeAsInteger("Count");
+
+    for (int i=0 ;i<Cnt ;i++) {
+        reader.readElement("Property");
+        const char* PropName = reader.getAttribute("name");
+        const char* TypeName = reader.getAttribute("type");
+        App::Property* prop = getPropertyByName(PropName);
+
+        try {
+            if (prop && strcmp(prop->getTypeId().getName(), TypeName) == 0) {
+                prop->Restore(reader);
+            }
+            else if (prop) {
+                Base::Type inputType = Base::Type::fromName(TypeName);
+                if (prop->getTypeId().isDerivedFrom(App::PropertyFloat::getClassTypeId()) &&
+                    inputType.isDerivedFrom(App::PropertyFloat::getClassTypeId())) {
+                    // Do not directly call the property's Restore method in case the implmentation
+                    // has changed. So, create a temporary PropertyFloat object and assign the value.
+                    App::PropertyFloat floatProp;
+                    floatProp.Restore(reader);
+                    static_cast<App::PropertyFloat*>(prop)->setValue(floatProp.getValue());
+                }
+            }
+        }
+        catch (const Base::XMLParseException&) {
+            throw; // re-throw
+        }
+        catch (const Base::Exception &e) {
+            Base::Console().Error("%s\n", e.what());
+        }
+        catch (const std::exception &e) {
+            Base::Console().Error("%s\n", e.what());
+        }
+        catch (const char* e) {
+            Base::Console().Error("%s\n", e);
+        }
+#ifndef FC_DEBUG
+        catch (...) {
+            Base::Console().Error("Primitive::Restore: Unknown C++ exception thrown");
+        }
+#endif
+
+        reader.readEndElement("Property");
+    }
+    reader.readEndElement("Properties");
+}
+
 void ViewProvider2DObject::attach(App::DocumentObject *pcFeat)
 {
     ViewProviderPart::attach(pcFeat);

src/Mod/Part/Gui/ViewProvider2DObject.h

@@ -39,43 +39,44 @@ namespace PartGui {
 
 class PartGuiExport ViewProvider2DObject: public PartGui::ViewProviderPart
 {
-  PROPERTY_HEADER(PartGui::ViewProvider2DObject);
+    PROPERTY_HEADER(PartGui::ViewProvider2DObject);
 
 public:
-  /// constructor
-  ViewProvider2DObject();
-  /// destructor
-  virtual ~ViewProvider2DObject();
+    /// constructor
+    ViewProvider2DObject();
+    /// destructor
+    virtual ~ViewProvider2DObject();
 
-  /// Property to switch the grid on and off
-  App::PropertyBool ShowGrid;
-  App::PropertyLength GridSize;
-  App::PropertyEnumeration GridStyle;
-  App::PropertyBool TightGrid;
-  App::PropertyBool GridSnap;
+    /// Property to switch the grid on and off
+    App::PropertyBool ShowGrid;
+    App::PropertyLength GridSize;
+    App::PropertyEnumeration GridStyle;
+    App::PropertyBool TightGrid;
+    App::PropertyBool GridSnap;
 
-  virtual void attach(App::DocumentObject *);
-  virtual void updateData(const App::Property*);
-  virtual std::vector<std::string> getDisplayModes(void) const;
-  virtual const char* getDefaultDisplayMode() const;
+    virtual void attach(App::DocumentObject *);
+    virtual void updateData(const App::Property*);
+    virtual std::vector<std::string> getDisplayModes(void) const;
+    virtual const char* getDefaultDisplayMode() const;
 
-  /// creates the grid
-  SoSeparator* createGrid(void); 
+    /// creates the grid
+    SoSeparator* createGrid(void); 
 
 protected:
-  virtual bool setEdit(int ModNum);
-  virtual void unsetEdit(int ModNum);
-  /// get called by the container whenever a property has been changed
-  virtual void onChanged(const App::Property* prop);
+    virtual bool setEdit(int ModNum);
+    virtual void unsetEdit(int ModNum);
+    /// get called by the container whenever a property has been changed
+    virtual void onChanged(const App::Property* prop);
+    virtual void Restore(Base::XMLReader &reader);
 
-  SoSeparator  *GridRoot;
+    SoSeparator  *GridRoot;
 
-  float MinX;
-  float MaxX;
-  float MinY;
-  float MaxY;
-  static const char* GridStyleEnums[];
-  static App::PropertyQuantityConstraint::Constraints GridSizeRange;
+    float MinX;
+    float MaxX;
+    float MinY;
+    float MaxY;
+    static const char* GridStyleEnums[];
+    static App::PropertyQuantityConstraint::Constraints GridSizeRange;
 };
 
 typedef Gui::ViewProviderPythonFeatureT<ViewProvider2DObject> ViewProvider2DObjectPython;