Issues 0022843, 0022845, 0022846

* Issue 0022845: EDF GEOM: [HYDRO] Hiding the coordinates system part of the dialog box in the polyline editor
  - Disabled display of coordinate system combo box
* Issue 0022843: EDF GEOM: [HYDRO] Polyline using a former polyline
  - Changed algorithm of polyline and spline construction
* Issue 0022846: EDF GEOM: [HYDRO] Creation of a polyline: add intermediate points and remove points
  - Added possibility to add/remove/modify new or intermediate points, select and modify them
  - Added possibility to drag and drop points in a view
  - Set violet color for preview in temporary Z layer
  - Changed behavior of selected object

src/CurveCreator/CurveCreator_Widget.cxx

@@ -318,6 +318,7 @@ int CurveCreator_Widget::changeInteractionStyle( int theStyle )
 //=======================================================================
 void CurveCreator_Widget::reset()
 {
+  stopActionMode();
 }
 
 void CurveCreator_Widget::setCurve( CurveCreator_ICurve* theCurve )
@@ -618,8 +619,6 @@ void CurveCreator_Widget::onModifySection()
   mySectionView->sectionChanged(mySection);
   updateUndoRedo();
   onCancelSection();
-
-  emit curveModified();
 }
 
 void CurveCreator_Widget::onJoin()
@@ -653,8 +652,6 @@ void CurveCreator_Widget::onJoin()
   if( aNewSectSize != aMainSectSize )
     mySectionView->pointsAdded( aMainSect, aMainSectSize, aNewSectSize-aMainSectSize );*/
   updateUndoRedo();
-
-  emit curveModified();
 }
 
 void CurveCreator_Widget::onRemove()
@@ -683,8 +680,6 @@ void CurveCreator_Widget::onClearAll()
   mySectionView->reset();
   updateActionsStates();
   updateUndoRedo();
-  
-  emit curveModified();
 }
 
 void CurveCreator_Widget::onJoinAll()
@@ -702,8 +697,6 @@ void CurveCreator_Widget::onJoinAll()
   mySectionView->reset();
   updateActionsStates();
   updateUndoRedo();
-
-  emit curveModified();
 }
 
 void CurveCreator_Widget::onUndoSettings()
@@ -722,8 +715,6 @@ void CurveCreator_Widget::onSetSpline()
     mySectionView->sectionChanged(aSelSections[i]);
   }
   updateUndoRedo();
-
-  emit curveModified();
 }
 
 void CurveCreator_Widget::onSetPolyline()
@@ -737,8 +728,6 @@ void CurveCreator_Widget::onSetPolyline()
     mySectionView->sectionChanged( aSelSections[i] );
   }
   updateUndoRedo();
-
-  emit curveModified();
 }
 
 void CurveCreator_Widget::onCloseSections()
@@ -752,8 +741,6 @@ void CurveCreator_Widget::onCloseSections()
     mySectionView->sectionChanged(aSelSections[i]);
   }
   updateUndoRedo();
-
-  emit curveModified();
 }
 
 void CurveCreator_Widget::onUncloseSections()
@@ -767,8 +754,6 @@ void CurveCreator_Widget::onUncloseSections()
     mySectionView->sectionChanged(aSelSections[i]);
   }
   updateUndoRedo();
-
-  emit curveModified();
 }
 
 void CurveCreator_Widget::onUndo()
@@ -781,8 +766,6 @@ void CurveCreator_Widget::onUndo()
   myCurve->undo();
   finishCurveModification();
   mySectionView->reset();
-
-  emit curveModified();
 }
 
 void CurveCreator_Widget::onRedo()
@@ -794,8 +777,6 @@ void CurveCreator_Widget::onRedo()
   myCurve->redo();
   finishCurveModification();
   mySectionView->reset();
-
-  emit curveModified();
 }
 
 void CurveCreator_Widget::updateUndoRedo()
@@ -1005,8 +986,9 @@ void CurveCreator_Widget::onMousePress( SUIT_ViewWindow*, QMouseEvent* theEvent
   if ( theEvent->button() != Qt::LeftButton )
     return;
 
-  myPressedX = theEvent->x();
+  // Initialize the starting point
-  myPressedY = theEvent->y();
+  myStartPoint.setX( theEvent->x() );
+  myStartPoint.setY( theEvent->y() );
 
   switch( getActionMode() ) {
     case ModificationMode: {
@@ -1028,11 +1010,61 @@ void CurveCreator_Widget::onMousePress( SUIT_ViewWindow*, QMouseEvent* theEvent
  * \param theWindow an owner of the signal
  * \param theEvent a mouse event
  */
-void CurveCreator_Widget::onMouseRelease( SUIT_ViewWindow*, QMouseEvent* theEvent )
+void CurveCreator_Widget::onMouseRelease( SUIT_ViewWindow* theWindow, QMouseEvent* theEvent )
 {
-  if ( getActionMode() != ModificationMode )
+  
+  if (theEvent->button() != Qt::LeftButton) return;
+  if (!theWindow->inherits("OCCViewer_ViewWindow")) return;
+
+  // Initialize the ending point
+  myEndPoint.setX( theEvent->x() );
+  myEndPoint.setY( theEvent->y() );
+
+  bool aHasShift = ( theEvent->modifiers() & Qt::ShiftModifier );
+
+  // Highlight detected objects
+  Handle(AIS_InteractiveContext) aCtx = getAISContext();
+  if ( !aCtx.IsNull() )
+  {
+    OCCViewer_ViewWindow* aView = (OCCViewer_ViewWindow*) theWindow;
+    if (!aView)
       return;
 
+    if (!aHasShift)
+      aCtx->ClearCurrents( false );
+
+    Handle(V3d_View) aView3d = aView->getViewPort()->getView();
+    if ( !aView3d.IsNull() )
+    {
+      // Initialize the single selection if start and end points are equal,
+      // otherwise a rectangular selection.
+      if ( myStartPoint == myEndPoint )
+      {
+        aCtx->MoveTo( myEndPoint.x(), myEndPoint.y(), aView3d );
+        if ( aHasShift )
+          aCtx->ShiftSelect();
+        else
+          aCtx->Select();
+      }
+      else
+      {
+        if ( aHasShift )
+          aCtx->ShiftSelect( myStartPoint.x(), myStartPoint.y(), myEndPoint.x(), myEndPoint.y(),
+                             aView3d, Standard_False );
+        else
+          aCtx->Select( myStartPoint.x(), myStartPoint.y(), myEndPoint.x(), myEndPoint.y(),
+                        aView3d, Standard_False );
+      }
+    }
+  }
+
+  if ( getActionMode() != ModificationMode )
+  {
+    // Emit selectionChanged() signal
+    getOCCViewer()->performSelectionChanged();
+    return;
+  }
+
   if ( myDragStarted ) {
     bool isDragged = myDragged;
     CurveCreator_ICurve::SectionToPointList aDraggedPoints;
@@ -1104,17 +1136,13 @@ void CurveCreator_Widget::onMouseRelease( SUIT_ViewWindow*, QMouseEvent* theEven
   }
   else // check whether the segment is clicked an a new point should be added to the segment
   {
-    int aReleasedX = theEvent->x();
+    if ( myStartPoint.x() == myEndPoint.x() && myStartPoint.y() == myEndPoint.y() )
-    int aReleasedY = theEvent->y();
+      insertPointToSelectedSegment( myEndPoint.x(), myStartPoint.y() );
-    if ( myPressedX == aReleasedX && myPressedY == aReleasedY )
-      insertPointToSelectedSegment( aReleasedX, aReleasedY );
   }
 
   // updates the input panel table to show the selected point coordinates
   updateLocalPointView();
   updateUndoRedo();
-
-  emit curveModified();
 }
 
 /**
@@ -1182,8 +1210,6 @@ void CurveCreator_Widget::onCellChanged( int theRow, int theColumn )
   myCurve->setPoint( aCurrSect, aPntIndex, aChangedPos );
 
   finishCurveModification( aSelPoints );
-
-  emit curveModified();
 }
 
 /**
@@ -1201,8 +1227,6 @@ void CurveCreator_Widget::removeSection()
   }
   mySectionView->clearSelection();
   updateUndoRedo();
-
-  emit curveModified();
 }
 
 /**
@@ -1221,8 +1245,6 @@ void CurveCreator_Widget::removePoint()
   myCurve->removeSeveralPoints( aPoints );
   finishCurveModification( CurveCreator_ICurve::SectionToPointList() );
   mySectionView->reset();
-
-  emit curveModified();
 }
 
 void CurveCreator_Widget::addNewPoint(const CurveCreator::Coordinates& theCoords)
@@ -1238,8 +1260,6 @@ void CurveCreator_Widget::addNewPoint(const CurveCreator::Coordinates& theCoords
   mySectionView->pointsAdded( aSection, myCurve->getNbPoints( aSection ) );
   updateActionsStates();
   updateUndoRedo();
-
-  emit curveModified();
 }
 
 void CurveCreator_Widget::insertPointToSelectedSegment( const int theX,
@@ -1306,8 +1326,6 @@ void CurveCreator_Widget::insertPointToSelectedSegment( const int theX,
   finishCurveModification( aSelPoints );
 
   setSelectedPoints();
-
-  emit curveModified();
 }
 
 void CurveCreator_Widget::moveSelectedPoints( const int theXPosition,
@@ -1355,8 +1373,6 @@ void CurveCreator_Widget::moveSelectedPoints( const int theXPosition,
 
   myDragged = true;
   finishCurveModification( myDragPoints );
-
-  emit curveModified();
 }
 
 void CurveCreator_Widget::updateLocalPointView()

src/CurveCreator/CurveCreator_Widget.h

@@ -100,7 +100,6 @@ signals:
   void selectionChanged();
   void subOperationStarted( QWidget*, bool );
   void subOperationFinished( QWidget* );
-  void curveModified();
 
 public slots:
 
@@ -205,6 +204,11 @@ private:
   bool contains( const CurveCreator_ICurve::SectionToPointList& theList,
                  const CurveCreator_ICurve::SectionToPoint& theValue ) const;
 
+protected:
+  // Boundary points of mouse to select the points
+  QPoint myStartPoint;
+  QPoint myEndPoint;
+
 private:
   QMap<ActionId, QAction*>    myActionMap;
   CurveCreator_ICurve*        myCurve;
@@ -223,8 +227,6 @@ private:
   QMap<CurveCreator_ICurve::SectionToPoint, CurveCreator::Coordinates> myInitialDragPointsCoords;
   bool                        myDragged;
   QByteArray                  myGuiState;
-  int                         myPressedX;
-  int                         myPressedY;
   OCCViewer_ViewWindow::Mode2dType myOld2DMode;
 };
 

src/EntityGUI/EntityGUI_PolylineDlg.cxx

@@ -22,6 +22,7 @@
 
 #include "EntityGUI_PolylineDlg.h"
 #include <CurveCreator_Curve.hxx>
+#include <CurveCreator_Displayer.hxx>
 #include <CurveCreator_Utils.hxx>
 #include <CurveCreator_Widget.h>
 #include <DlgRef.h>
@@ -40,6 +41,7 @@
 #include <BRep_Tool.hxx>
 #include <Geom_Surface.hxx>
 #include <GeomLib_IsPlanarSurface.hxx>
+#include <Prs3d_LineAspect.hxx>
 #include <TopoDS.hxx>
 
 #include <QGroupBox>
@@ -63,7 +65,9 @@ EntityGUI_PolylineDlg::EntityGUI_PolylineDlg
     myWPlaneLineEdit      (0),
     myPolylineSelButton   (0),
     myPolylineEdit        (0),
-    myEditCurrentArgument (0)
+    myEditCurrentArgument (0),
+    myPreviewManager(0),
+    myPreviewZLayer(-1)
 {
   QPixmap image0(SUIT_Session::session()->resourceMgr()->loadPixmap("GEOM", tr("ICON_CC_POLYLINE")));
   QPixmap image1(SUIT_Session::session()->resourceMgr()->loadPixmap("GEOM", tr("ICON_SELECT")));
@@ -91,6 +95,13 @@ EntityGUI_PolylineDlg::EntityGUI_PolylineDlg
   myPlnButton->setText( tr( "GEOM_SKETCHER_RESTORE" ) );
   aPlaneLayout->addWidget(myPlnButton, 0, 3);
 
+  bool isCS = false;
+#ifdef SET_PLANE
+  isCS = true;
+#endif
+  myPlnComboBox->setVisible( isCS );
+  myPlnButton->setVisible( isCS );
+
 #ifdef SET_PLANE
   QLabel *aPlaneLbl = new QLabel(tr("GEOM_PLANE"), aGroupBox1);
 
@@ -104,6 +115,7 @@ EntityGUI_PolylineDlg::EntityGUI_PolylineDlg
 
   myPolylineSelButton = new QPushButton (aGroupBox1);
   myPolylineSelButton->setIcon(image1);
+  myPolylineSelButton->setCheckable(true);
   myPolylineEdit = new QLineEdit (aGroupBox1);
   myPolylineEdit->setReadOnly(true);
 
@@ -139,7 +151,7 @@ EntityGUI_PolylineDlg::EntityGUI_PolylineDlg
 
   setHelpFileName( "create_polyline_page.html" );
 
-  /* Initialisations */
+  /* Initializations */
   Init();
 }
 
@@ -149,7 +161,7 @@ EntityGUI_PolylineDlg::EntityGUI_PolylineDlg
 //=================================================================================
 EntityGUI_PolylineDlg::~EntityGUI_PolylineDlg()
 {
-  delete myCurve;
+  erasePreview();
 }
 
 //=================================================================================
@@ -166,6 +178,7 @@ void EntityGUI_PolylineDlg::Init()
   LightApp_SelectionMgr *aSelMgr = myGeomGUI->getApp()->selectionMgr();
 
   myEditorWidget->setOCCViewer(aViewManager ? aViewManager->getOCCViewer() : 0);
+  setPreviewManager( aViewManager );
 
   // Init the list of local coordinate system
   gp_Pnt aPnt(0., 0., 0.);
@@ -178,35 +191,32 @@ void EntityGUI_PolylineDlg::Init()
   myWPlaneList.push_back(GEOM::GeomObjPtr());
   myLCSList.push_back(aLCS);
 
-  connect(myGeomGUI,      SIGNAL(SignalDeactivateActiveDialog()), this, SLOT(DeactivateActiveDialog()));
-  connect(myGeomGUI,      SIGNAL(SignalCloseAllDialogs()),        this, SLOT(ClickOnCancel()));
-
 #ifdef SET_PLANE
-  connect(myPlnSelButton, SIGNAL(clicked()),
+  connect( myPlnSelButton, SIGNAL(toggled(bool)),
-          this,           SLOT(SetEditCurrentArgument()));
+           this,           SLOT(SetEditCurrentArgument(bool)) );
 #endif
-  connect(myPolylineSelButton, SIGNAL(clicked()),
+  connect( myPolylineSelButton, SIGNAL(toggled(bool)),
-          this,                SLOT(SetEditCurrentArgument()));
+           this,                SLOT(SetEditCurrentArgument(bool)) );
-  connect(aSelMgr,        SIGNAL(currentSelectionChanged()),
+  connect( aSelMgr, SIGNAL(currentSelectionChanged()),
-          this,           SLOT(SelectionIntoArgument()));
+           this,    SLOT(SelectionIntoArgument()) );
-  connect(myEditorWidget, SIGNAL(subOperationStarted(QWidget*, bool)),
+  connect( myEditorWidget, SIGNAL(subOperationStarted(QWidget*, bool)),
-          this,           SLOT(processStartedSubOperation(QWidget*, bool)));
+           this,           SLOT(processStartedSubOperation(QWidget*, bool)) );
-  connect(myEditorWidget, SIGNAL(subOperationFinished(QWidget*)),
+  connect( myEditorWidget, SIGNAL(subOperationFinished(QWidget*)),
-          this,           SLOT(processFinishedSubOperation(QWidget*)));
+           this,           SLOT(processFinishedSubOperation(QWidget*)) );
-  connect(myEditorWidget, SIGNAL(curveModified()),
-          this,           SLOT(onUpdatePreview()));
 #ifdef SET_PLANE
-  connect(myPlnComboBox,  SIGNAL(activated(int)),
+  connect( myPlnComboBox,  SIGNAL(activated(int)),
-          this,           SLOT(ActivateLocalCS()));
+           this,           SLOT(ActivateLocalCS()) );
-  connect(myPlnButton,    SIGNAL(clicked()),
+  connect( myPlnButton,    SIGNAL(clicked()),
-          this,           SLOT(ActivateLocalCS()));
+           this,           SLOT(ActivateLocalCS()) );
 #endif
-  connect(buttonOk(),    SIGNAL(clicked()), this, SLOT(ClickOnOk()));
+  connect( buttonOk(),    SIGNAL(clicked()), this, SLOT(ClickOnOk()) );
-  connect(buttonApply(), SIGNAL(clicked()), this, SLOT(ClickOnApply()));
+  connect( buttonApply(), SIGNAL(clicked()), this, SLOT(ClickOnApply()) );
 
   myAddElementBox->hide();
-  myPolylineSelButton->click();
+
-  SelectionIntoArgument();
+  // Processing of the selected object
+  myPolylineSelButton->setChecked( true );
+  SelectionIntoArgument( true );
 }
 
 //=================================================================================
@@ -365,6 +375,9 @@ bool EntityGUI_PolylineDlg::ClickOnApply()
 
   initName();
 
+  // Reset actions
+  myEditorWidget->reset();
+
   return true;
 }
 
@@ -432,17 +445,19 @@ bool EntityGUI_PolylineDlg::deleteEnabled()
 // function : SelectionIntoArgument
 // purpose  : Called when selection is changed
 //=================================================================================
-void EntityGUI_PolylineDlg::SelectionIntoArgument()
+void EntityGUI_PolylineDlg::SelectionIntoArgument( bool isForced )
 {
-  bool             isModified      = false;
+  bool             isModified      = isForced;
   GEOM::GeomObjPtr aSelectedObject = getSelected(TopAbs_SHAPE);
   TopoDS_Shape     aShape;
 
   if (aSelectedObject && GEOMBase::GetShape(aSelectedObject.get(), aShape) &&
-      !aShape.IsNull()) {
+      !aShape.IsNull())
+  {
     QString aName = GEOMBase::GetName(aSelectedObject.get()); 
 
-    if (myEditCurrentArgument == myPolylineEdit) {
+    if ( myEditCurrentArgument == myPolylineEdit && isCheckToSelect() )
+    {
       // Import a curve
       CurveCreator_Curve *aNewCurve = 
         new CurveCreator_Curve(CurveCreator::Dim2d);
@@ -458,15 +473,22 @@ void EntityGUI_PolylineDlg::SelectionIntoArgument()
 #ifdef SET_PLANE
         AddLocalCS(aSelectedObject.get(), false, aLocalCS);
         myWPlaneLineEdit->clear();
-        myPlnSelButton->setDown(false);
+        myPlnSelButton->setChecked(false);
 #endif
-        myPolylineSelButton->setDown(true);
+        myPolylineSelButton->setChecked(false);
+
+        disconnect(myGeomGUI->getApp()->selectionMgr(), 0, this, 0);
+        myGeomGUI->getApp()->selectionMgr()->clearSelected();
+        connect(myGeomGUI->getApp()->selectionMgr(), SIGNAL(currentSelectionChanged()),
+                this, SLOT(SelectionIntoArgument()));
       } else {
         // Does nothing, just clears selection.
         delete aNewCurve;
       }
+    }
 #ifdef SET_PLANE
-    } else if (myEditCurrentArgument == myWPlaneLineEdit) {
+    else if ( myEditCurrentArgument == myWPlaneLineEdit && isCheckToSelect() )
+    {
       // Import planar face.
       if (aShape.ShapeType() == TopAbs_FACE) {
         // Check if the face is planar
@@ -479,47 +501,65 @@ void EntityGUI_PolylineDlg::SelectionIntoArgument()
           AddLocalCS(aSelectedObject.get(), true, 
                      WPlaneToLCS(aSelectedObject.get()));
           isModified = true;
-          myPlnSelButton->setDown(true);
+          myPlnSelButton->setChecked(false);
-          myPolylineSelButton->setDown(false);
+          myPolylineSelButton->setChecked(false);
         }
       }
       
       if (!isModified) {
         myEditCurrentArgument->setText(tr("GEOM_SKETCHER_WPLANE"));
       }
+    }
 #endif
   }
+  else
+  {
+    if (isForced)
+    {
+#ifdef SET_PLANE
+      myPlnSelButton->setChecked(false);
+#endif
+      myPolylineSelButton->setChecked(false);
+    }
   }
 
-  if (!isModified) {
+  if (!isModified)
+  {
     // Does nothing, just clears selection.
     disconnect(myGeomGUI->getApp()->selectionMgr(), 0, this, 0);
     myGeomGUI->getApp()->selectionMgr()->clearSelected();
     connect(myGeomGUI->getApp()->selectionMgr(), SIGNAL(currentSelectionChanged()),
             this, SLOT(SelectionIntoArgument()));
   }
+  else
+    displayPreview();
 }
 
 //=================================================================================
 // function : SetEditCurrentArgument()
 // purpose  :
 //=================================================================================
-void EntityGUI_PolylineDlg::SetEditCurrentArgument()
+void EntityGUI_PolylineDlg::SetEditCurrentArgument( bool isChecked )
 {
-  if (sender() == myPlnSelButton) {
+  if (sender() == myPlnSelButton)
+  {
 #ifdef SET_PLANE
     myEditCurrentArgument = myWPlaneLineEdit;
     myEditCurrentArgument->setFocus();
-    myPlnSelButton->setDown(true);
+    myPolylineSelButton->blockSignals(true);
-    myPolylineSelButton->setDown(false);
+    myPolylineSelButton->setChecked(false);
+    myPolylineSelButton->blockSignals(false);
 #endif
-  } else if (sender() == myPolylineSelButton) {
+  }
+  else if (sender() == myPolylineSelButton)
+  {
     myEditCurrentArgument = myPolylineEdit;
     myEditCurrentArgument->setFocus();
 #ifdef SET_PLANE
-    myPlnSelButton->setDown(false);
+    myPlnSelButton->blockSignals(true);
+    myPlnSelButton->setChecked(false);
+    myPlnSelButton->blockSignals(false);
 #endif
-    myPolylineSelButton->setDown(true);
   }
 }
 
@@ -545,15 +585,6 @@ void EntityGUI_PolylineDlg::enterEvent (QEvent*)
     ActivateThisDialog();
 }
 
-//=================================================================================
-// function : onUpdatePreview
-// purpose  : 
-//=================================================================================
-void EntityGUI_PolylineDlg::onUpdatePreview()
-{
-  displayPreview(true);
-}
-
 //=================================================================================
 // function : ActivateLocalCS
 // purpose  : Activate & Fit Working plane
@@ -680,3 +711,126 @@ QList<GEOM::GeomObjPtr> EntityGUI_PolylineDlg::getSourceObjects()
 {
   return myWPlaneList;
 }
+
+//=================================================================================
+// function : setPreviewManager ( OCCViewer_ViewManager )
+// purpose  : Sets view manager to control the displayed objects.
+//=================================================================================
+void EntityGUI_PolylineDlg::setPreviewManager( OCCViewer_ViewManager* theManager )
+{
+  myPreviewManager = theManager;
+
+  if ( getPreviewManager() )
+  {
+    if( OCCViewer_Viewer* aViewer = getPreviewManager()->getOCCViewer() )
+    {
+      Handle(AIS_InteractiveContext) aCtx = aViewer->getAISContext();
+      if( !aCtx.IsNull() )
+      {
+        // Add Z layer to show temporary objects
+        int aZLayer = -1;
+        aViewer->getViewer3d()->AddZLayer( aZLayer );
+        setPreviewZLayer( aZLayer );
+      }
+    }
+  }
+}
+
+//=================================================================================
+// function : getPreviewManager()
+// purpose  : 
+//=================================================================================
+OCCViewer_ViewManager* EntityGUI_PolylineDlg::getPreviewManager()
+{
+  return myPreviewManager;
+}
+
+//=================================================================================
+// function : setPreviewZLayer( theZLayer )
+// purpose  : Sets Z layer to show temporary objects.
+//=================================================================================
+void EntityGUI_PolylineDlg::setPreviewZLayer( int theZLayer )
+{
+  if ( theZLayer != myPreviewZLayer )
+    myPreviewZLayer = theZLayer;
+}
+
+//=================================================================================
+// function : getPreviewZLayer()
+// purpose  : 
+//=================================================================================
+int EntityGUI_PolylineDlg::getPreviewZLayer() const
+{
+  return myPreviewZLayer;
+}
+
+//=================================================================================
+// function : displayPreview()
+// purpose  : 
+//=================================================================================
+void EntityGUI_PolylineDlg::displayPreview()
+{
+  if ( getPreviewManager() )
+  {
+    if ( OCCViewer_Viewer* aViewer = getPreviewManager()->getOCCViewer() )
+    {
+      // Disable changing of OCCViewer's selection to use vertex of curve selection
+      disconnect(getPreviewManager(), SIGNAL(mouseRelease(SUIT_ViewWindow*, QMouseEvent*)),
+                 aViewer,             SLOT(onMouseRelease(SUIT_ViewWindow*, QMouseEvent*)));
+
+      Handle(AIS_InteractiveContext) aCtx = aViewer->getAISContext();
+      if ( !aCtx.IsNull() )
+      {
+        CurveCreator_Displayer* aDisplayer = new CurveCreator_Displayer( aCtx, getPreviewZLayer() );
+        myCurve->setDisplayer( aDisplayer );
+
+        Handle(AIS_InteractiveObject) anAISObj = myCurve->getAISObject( true );
+        aDisplayer->display( anAISObj, true );
+
+        // Set color for temporary AIS_InteractiveObject
+        anAISObj->Attributes()->WireAspect()->SetColor( Quantity_NOC_VIOLET );
+      }
+    }
+  }
+}
+
+//=================================================================================
+// function : erasePreview()
+// purpose  : 
+//=================================================================================
+void EntityGUI_PolylineDlg::erasePreview()
+{
+  CurveCreator_Displayer* aDisplayer = myCurve ? myCurve->getDisplayer() : 0;
+  if( getPreviewManager() )
+  {
+    if( OCCViewer_Viewer* aViewer = getPreviewManager()->getOCCViewer() )
+    {
+      Handle(AIS_InteractiveContext) aCtx = aViewer->getAISContext();
+      if( !aCtx.IsNull() && aDisplayer )
+        aDisplayer->eraseAll( true );
+
+      // Enable changing of OCCViewer's selection
+      connect(getPreviewManager(), SIGNAL(mouseRelease(SUIT_ViewWindow*, QMouseEvent*)),
+              aViewer,             SLOT(onMouseRelease(SUIT_ViewWindow*, QMouseEvent*)));
+    }
+  }
+
+  setPreviewManager( NULL );
+  if ( myCurve )
+  {
+    delete myCurve;
+    myCurve = NULL;
+  }
+}
+
+//=================================================================================
+// function : isCheckToSelect()
+// purpose  : 
+//=================================================================================
+bool EntityGUI_PolylineDlg::isCheckToSelect()
+{
+#ifdef SET_PLANE
+  return myPlnSelButton->isChecked();
+#endif
+  return myPolylineSelButton->isChecked();
+}

src/EntityGUI/EntityGUI_PolylineDlg.h

@@ -23,15 +23,14 @@
 #ifndef ENTITYGUI_POLYLINEDLG_H
 #define ENTITYGUI_POLYLINEDLG_H
 
-
 #include <GEOMBase_Skeleton.h>
 
 class CurveCreator_Curve;
 class CurveCreator_Widget;
+class OCCViewer_ViewManager;
 class QGroupBox;
 class QComboBox;
 
-
 //=================================================================================
 // class    : EntityGUI_PolylineDlg
 // purpose  :
@@ -50,6 +49,9 @@ public:
   void  deleteSelected();
   bool  deleteEnabled();
 
+  void  setPreviewZLayer( int theLayer );
+  int   getPreviewZLayer() const;
+
 protected:
 
   // redefined from GEOMBase_Helper
@@ -58,6 +60,20 @@ protected:
   virtual bool                       execute( ObjectList& );
   virtual QList<GEOM::GeomObjPtr>    getSourceObjects();
 
+  /**
+   * This method sets/gets the view manager to control the temporary
+   * displayed objects on Z layer. 
+   * \param theManager the view manager.
+   */
+  void                   setPreviewManager( OCCViewer_ViewManager* theManager );
+  OCCViewer_ViewManager* getPreviewManager();
+
+  /**
+   * This method defines a state of selection button.
+   * \return true if selection button is checked, otherwise false.
+   */
+  bool isCheckToSelect();
+
 private:
 
   void Init();
@@ -103,7 +119,7 @@ private:
    * This method add a local coordinate system of the selected object.
    *
    * \param theSelectedObject the selected object. It can be a planar face
-   *        or an inported polyline.
+   *        or an imported polyline.
    * \param IsPlane true for planar face; false for imported polyline.
    * \param theLCS the local coordinate system.
    */
@@ -120,6 +136,18 @@ private:
    */
   gp_Ax3 WPlaneToLCS(GEOM::GeomObjPtr theGeomObj);
 
+  /**
+   * This method displays the AIS_InteractiveObject(s) to preview
+   * on the Z layer and sets VIOLET color.
+   */
+  void displayPreview();
+
+  /**
+   * This method erases AIS_InteractiveObject(s) from
+   * AIS_InteractiveContext and release memory.
+   */
+  void erasePreview();
+
 protected slots:
 
   void ClickOnOk();
@@ -127,10 +155,9 @@ protected slots:
   void ClickOnCancel();
   void processStartedSubOperation( QWidget*, bool );
   void processFinishedSubOperation( QWidget* );
-  void SetEditCurrentArgument();
+  void SetEditCurrentArgument( bool );
-  void SelectionIntoArgument();
+  void SelectionIntoArgument( bool isForced = false );
   void ActivateThisDialog();
-  void onUpdatePreview();
   void ActivateLocalCS();
 
 private:
@@ -147,6 +174,8 @@ private:
   QLineEdit                    *myEditCurrentArgument;   /* Current LineEdit */
   QList<gp_Ax3>                 myLCSList;
   QList<GEOM::GeomObjPtr>       myWPlaneList;
+  OCCViewer_ViewManager*        myPreviewManager;
+  int                           myPreviewZLayer;
 
 };