0021275: EDF 1681 SMESH: Find the number of nodes of any group

+  virtual int GetTic() const;

src/SMESHDS/SMESHDS_Group.cxx

@@ -161,6 +161,17 @@ SMDS_ElemIteratorPtr SMESHDS_Group::GetElements() const
   return SMDS_ElemIteratorPtr( new MyGroupIterator ( myGroup ));
 }
 
+//================================================================================
+/*!
+ * \brief Return a value allowing to find out if a group has changed or not
+ */
+//================================================================================
+
+int SMESHDS_Group::GetTic() const
+{
+  return myGroup.Tic();
+}
+
 //=======================================================================
 //function : SetType
 //purpose  : 

src/SMESHDS/SMESHDS_Group.hxx

@@ -56,6 +56,8 @@ class SMESHDS_EXPORT SMESHDS_Group : public SMESHDS_GroupBase
 
   virtual SMDS_ElemIteratorPtr GetElements() const;
 
+  virtual int GetTic() const;
+
   bool Add (const int theID);
 
   bool Remove (const int theID);

src/SMESHDS/SMESHDS_GroupBase.hxx

@@ -71,6 +71,8 @@ class SMESHDS_EXPORT SMESHDS_GroupBase
   virtual int GetID (const int theIndex);
   // use it for iterations 1..Extent()
 
+  virtual int GetTic() const = 0;
+
   virtual ~SMESHDS_GroupBase() {}
 
   void SetColor (const Quantity_Color& theColor)

src/SMESHDS/SMESHDS_GroupOnFilter.cxx

@@ -40,7 +40,7 @@ SMESHDS_GroupOnFilter::SMESHDS_GroupOnFilter (const int                 theID,
                                               const SMESHDS_Mesh*       theMesh,
                                               const SMDSAbs_ElementType theType,
                                               const SMESH_PredicatePtr& thePredicate)
-  : SMESHDS_GroupBase(theID,theMesh,theType), myMeshModifTime(0)
+  : SMESHDS_GroupBase(theID,theMesh,theType), myMeshModifTime(0), myPredicateTic(0)
 {
   setChanged();
   SetPredicate( thePredicate );
@@ -55,6 +55,7 @@ SMESHDS_GroupOnFilter::SMESHDS_GroupOnFilter (const int                 theID,
 void SMESHDS_GroupOnFilter::SetPredicate( const SMESH_PredicatePtr& thePredicate)
 {
   myPredicate = thePredicate;
+  ++myPredicateTic;
   setChanged();
   if ( myPredicate )
     myPredicate->SetMesh( GetMesh() );
@@ -123,6 +124,17 @@ int SMESHDS_GroupOnFilter::GetID (const int theIndex)
   return myElements[ theIndex-1 ]->GetID();
 }
 
+//================================================================================
+/*!
+ * \brief Return a value allowing to find out if a group has changed or not
+ */
+//================================================================================
+
+int SMESHDS_GroupOnFilter::GetTic() const
+{
+  return myMeshModifTime * myPredicateTic;
+}
+
 //================================================================================
 /*!
  * \brief Updates myElements if necessary

src/SMESHDS/SMESHDS_GroupOnFilter.hxx

@@ -56,6 +56,8 @@ class SMESHDS_EXPORT SMESHDS_GroupOnFilter: public SMESHDS_GroupBase
 
   virtual int GetID (const int theIndex);
 
+  virtual int GetTic() const;
+
  private:
 
   void update() const;
@@ -64,6 +66,7 @@ class SMESHDS_EXPORT SMESHDS_GroupOnFilter: public SMESHDS_GroupBase
   SMESH_PredicatePtr                    myPredicate;
   std::vector< const SMDS_MeshElement*> myElements;
   unsigned long                         myMeshModifTime; // when myElements was filled
+  int                                   myPredicateTic;
 };
 
 #endif

src/SMESHDS/SMESHDS_GroupOnGeom.cxx

@@ -128,3 +128,14 @@ bool SMESHDS_GroupOnGeom::Contains (const SMDS_MeshElement* elem)
   return mySubMesh->Contains( elem );
 }
 
+//================================================================================
+/*!
+ * \brief Return a value allowing to find out if a group has changed or not
+ */
+//================================================================================
+
+int SMESHDS_GroupOnGeom::GetTic() const
+{
+  return GetMesh()->GetMTime();
+}
+

src/SMESHDS/SMESHDS_GroupOnGeom.hxx

@@ -53,6 +53,8 @@ class SMESHDS_EXPORT SMESHDS_GroupOnGeom: public SMESHDS_GroupBase
 
   virtual SMDS_ElemIteratorPtr GetElements() const;
 
+  virtual int GetTic() const;
+
  private:
 
   TopoDS_Shape           myShape;