new methods:

1) selected - returns the selection ready to pass to dialog::selectObject
2) prefix - returns the int prefix for types corresponding to some groups (GEOM, SMESH, for example)
3) setDialogActive - allows to set dialog content enable or disable
4) slots onOk, onApply, onCancel - they will be connected automatically in startOperation if dialog has corresponding buttons

src/SMESHGUI/SMESHGUI_Operation.cxx

@@ -35,10 +35,9 @@
 // name    : SMESHGUI_Operation
 // Purpose : Constructor
 //=======================================================================
-SMESHGUI_Operation::SMESHGUI_Operation( SalomeApp_Application* app )
+SMESHGUI_Operation::SMESHGUI_Operation()
-: SalomeApp_Operation( app )
+: SalomeApp_Operation()
 {
-  
 }
 
 SMESHGUI_Operation::~SMESHGUI_Operation()
@@ -116,6 +115,22 @@ SVTK_Selector* SMESHGUI_Operation::selector() const
 //=======================================================================
 void SMESHGUI_Operation::startOperation()
 {
+  if( dlg() )
+  {
+    disconnect( dlg(), SIGNAL( dlgOk() ), this, SLOT( onOk() ) );
+    disconnect( dlg(), SIGNAL( dlgApply() ), this, SLOT( onApply() ) );
+    disconnect( dlg(), SIGNAL( dlgCancel() ), this, SLOT( onCancel() ) );
+    
+    if( dlg()->testButtonFlags( QtxDialog::OK ) )
+      connect( dlg(), SIGNAL( dlgOk() ), this, SLOT( onOk() ) );
+      
+    if( dlg()->testButtonFlags( QtxDialog::Apply ) )
+      connect( dlg(), SIGNAL( dlgApply() ), this, SLOT( onApply() ) );
+      
+    if( dlg()->testButtonFlags( QtxDialog::Cancel ) )
+      connect( dlg(), SIGNAL( dlgCancel() ), this, SLOT( onCancel() ) );
+  }    
+
   SalomeApp_Operation::startOperation();
 }
 
@@ -175,7 +190,7 @@ int SMESHGUI_Operation::typeById( const QString& str, const SelectedObjectType o
   else  
   {
     int pos = str.find( idChar() );
-    QString entry = str.left( pos-1 ),
+    QString entry = str.left( pos ),
             _id = str.mid( pos+1 );
     bool ok;
     int id = _id.toInt( &ok );
@@ -199,7 +214,7 @@ int SMESHGUI_Operation::typeById( const QString& str, const SelectedObjectType o
 // name    : prefix
 // Purpose : Get prefix for module types
 //=======================================================================
-int SMESHGUI_Operation::prefix( const QString& name ) const
+int SMESHGUI_Operation::prefix( const QString& name )
 {
   if( name == "GEOM" )
     return 100;
@@ -260,3 +275,78 @@ QChar SMESHGUI_Operation::idChar() const
 {
   return '#';
 }
+
+//=======================================================================
+// name    : setDialogActive
+// Purpose : 
+//=======================================================================
+void SMESHGUI_Operation::setDialogActive( const bool active )
+{
+  SalomeApp_Operation::setDialogActive( active );
+
+  SMESHGUI_Dialog* d = dynamic_cast<SMESHGUI_Dialog*>( dlg() );
+  if( d )
+    d->setContentActive( active );
+
+}
+
+//=======================================================================
+// name    : studyDS
+// Purpose :
+//=======================================================================
+_PTR(Study) SMESHGUI_Operation::studyDS() const
+{
+  SalomeApp_Study* s = dynamic_cast<SalomeApp_Study*>( study() );
+  if( s )
+    return s->studyDS();
+}
+
+//=======================================================================
+// name    : onOk
+// Purpose :
+//=======================================================================
+void SMESHGUI_Operation::onOk()
+{
+  if( onApply() )
+    commit();
+  else
+    abort();
+}
+
+//=======================================================================
+// name    : onApply
+// Purpose :
+//=======================================================================
+bool SMESHGUI_Operation::onApply()
+{
+  return false;
+}
+
+//=======================================================================
+// name    : onClose
+// Purpose :
+//=======================================================================
+void SMESHGUI_Operation::onCancel()
+{
+  abort();
+}
+
+//=======================================================================
+// name    : commitOperation
+// Purpose :
+//=======================================================================
+void SMESHGUI_Operation::commitOperation()
+{
+  selectionMgr()->clearFilters();
+  SalomeApp_Operation::commitOperation();
+}
+
+//=======================================================================
+// name    : abortOperation
+// Purpose :
+//=======================================================================
+void SMESHGUI_Operation::abortOperation()
+{
+  selectionMgr()->clearFilters();
+  SalomeApp_Operation::abortOperation();
+}

src/SMESHGUI/SMESHGUI_Operation.h

@@ -13,9 +13,12 @@
 #define SMESHGUI_Operation_H
 
 #include <SalomeApp_Operation.h>
+#include <SMESHGUI_Dialog.h>
 #include <SALOME_InteractiveObject.hxx>
 #include <SVTK_Selection.h>
 
+#include <SALOMEDSClient.hxx>
+
 class SMESHGUI;
 class SVTK_ViewWindow;
 class SVTK_Selector;
@@ -32,9 +35,12 @@ class SMESHGUI_Operation : public SalomeApp_Operation
   Q_OBJECT
 
 public:
-  SMESHGUI_Operation( SalomeApp_Application* );
+  SMESHGUI_Operation();
   virtual ~SMESHGUI_Operation();
 
+  static  int       prefix( const QString& );
+  // Return hard-coded prefix using to differ intersecting types
+  
 protected:
   typedef enum
   {
@@ -52,27 +58,33 @@ protected:
                                       const TColStd_MapOfInteger&, const bool );
 
   virtual void      startOperation();
+  virtual void      commitOperation();
+  virtual void      abortOperation();
   virtual bool      isReadyToStart();
 
   SMESHGUI*         getSMESHGUI() const;
   SVTK_ViewWindow*  viewWindow() const;
   SVTK_Selector*    selector() const;
 
+  _PTR(Study)       studyDS() const;
 
 
-  virtual int       prefix( const QString& ) const;
+  //! Get names, types and ids of selected objects
-  // Return hard-coded prefix using to differ intersecting types
+  virtual void      selected( QStringList&, SMESHGUI_Dialog::TypesList&, QStringList& ) const;
-
-  virtual void      selected( QStringList&, SalomeApp_Dialog::TypesList&, QStringList& ) const;
-  // Get names, types and ids of selected objects
-
-  virtual int       typeById( const QString&, const SelectedObjectType ) const;
-  // Find type by id
-
-  virtual QChar     idChar() const;
-  // Char using to divide <entry> and <id> in string id representation
-  // By default, '#'
   
+  //! Find type by id
+  virtual int       typeById( const QString&, const SelectedObjectType ) const;
+  
+  //! Char using to divide <entry> and <id> in string id representation. By default, '#'
+  virtual QChar     idChar() const;
+  
+  //! Set accroding dialog active or inactive
+  virtual void      setDialogActive( const bool );
+
+protected slots:
+  virtual void onOk();
+  virtual bool onApply();
+  virtual void onCancel();
 };
 
 #endif