From a1eef544515dd2a0064960db057643a09649fab7 Mon Sep 17 00:00:00 2001
From: wmayer <wmayer@users.sourceforge.net>
Date: Tue, 1 Mar 2016 18:24:39 +0100
Subject: [PATCH] + do not allow to set negative grid size in property editor

---
 src/Mod/Part/Gui/ViewProvider2DObject.cpp | 5 ++++-
 src/Mod/Part/Gui/ViewProvider2DObject.h   | 3 ++-
 2 files changed, 6 insertions(+), 2 deletions(-)

diff --git a/src/Mod/Part/Gui/ViewProvider2DObject.cpp b/src/Mod/Part/Gui/ViewProvider2DObject.cpp
index 52c51915c..910f9c61e 100644
--- a/src/Mod/Part/Gui/ViewProvider2DObject.cpp
+++ b/src/Mod/Part/Gui/ViewProvider2DObject.cpp
@@ -32,6 +32,7 @@
 # include <Inventor/nodes/SoPickStyle.h>
 # include <Inventor/nodes/SoSeparator.h>
 # include <Inventor/nodes/SoVertexProperty.h>
+# include <cfloat>
 #endif
 
 /// Here the FreeCAD includes sorted by Base,App,Gui......
@@ -52,6 +53,7 @@ using namespace std;
 // Construction/Destruction
 
 const char* ViewProvider2DObject::GridStyleEnums[]= {"Dashed","Light",NULL};
+App::PropertyQuantityConstraint::Constraints ViewProvider2DObject::GridSizeRange = {0.001,DBL_MAX,1.0};
 
 PROPERTY_SOURCE(PartGui::ViewProvider2DObject, PartGui::ViewProviderPart)
 
@@ -68,9 +70,10 @@ ViewProvider2DObject::ViewProvider2DObject()
     MinX = MinY = -100;
     MaxX = MaxY = 100;
     GridStyle.setEnums(GridStyleEnums);
+    GridSize.setConstraints(&GridSizeRange);
 
     pcRoot->addChild(GridRoot);
- 
+
     sPixmap = "PartFeatureImport";
 }
 
diff --git a/src/Mod/Part/Gui/ViewProvider2DObject.h b/src/Mod/Part/Gui/ViewProvider2DObject.h
index 48bec2f18..4811be35d 100644
--- a/src/Mod/Part/Gui/ViewProvider2DObject.h
+++ b/src/Mod/Part/Gui/ViewProvider2DObject.h
@@ -49,7 +49,7 @@ public:
 
   /// Property to switch the grid on and off
   App::PropertyBool ShowGrid;
-  App::PropertyDistance GridSize;
+  App::PropertyLength GridSize;
   App::PropertyEnumeration GridStyle;
   App::PropertyBool TightGrid;
   App::PropertyBool GridSnap;
@@ -75,6 +75,7 @@ protected:
   float MinY;
   float MaxY;
   static const char* GridStyleEnums[];
+  static App::PropertyQuantityConstraint::Constraints GridSizeRange;
 };
 
 typedef Gui::ViewProviderPythonFeatureT<ViewProvider2DObject> ViewProvider2DObjectPython;