smesh/src/SMESHGUI/SMESHGUI_MeshPatternDlg.cxx

// Copyright (C) 2007-2013  CEA/DEN, EDF R&D, OPEN CASCADE
//
// Copyright (C) 2003-2007  OPEN CASCADE, EADS/CCR, LIP6, CEA/DEN,
// CEDRAT, EDF R&D, LEG, PRINCIPIA R&D, BUREAU VERITAS
//
// This library is free software; you can redistribute it and/or
// modify it under the terms of the GNU Lesser General Public
// License as published by the Free Software Foundation; either
// version 2.1 of the License.
//
// This library is distributed in the hope that it will be useful,
// but WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// Lesser General Public License for more details.
//
// You should have received a copy of the GNU Lesser General Public
// License along with this library; if not, write to the Free Software
// Foundation, Inc., 59 Temple Place, Suite 330, Boston, MA  02111-1307 USA
//
// See http://www.salome-platform.org/ or email : webmaster.salome@opencascade.com
//

// SMESH SMESHGUI : GUI for SMESH component
// File   : SMESHGUI_MeshPatternDlg.cxx
// Author : Sergey LITONIN, Open CASCADE S.A.S.
// SMESH includes
//
#include "SMESHGUI_MeshPatternDlg.h"

#include "SMESHGUI.h"
#include "SMESHGUI_CreatePatternDlg.h"
#include "SMESHGUI_PatternWidget.h"
#include "SMESHGUI_Utils.h"
#include "SMESHGUI_VTKUtils.h"
#include "SMESHGUI_PatternUtils.h"
#include "SMESHGUI_GEOMGenUtils.h"

#include <SMESH_Actor.h>
#include <SMESH_ActorUtils.h>
#include <SMESH_NumberFilter.hxx>

#include <SMDS_Mesh.hxx>
#include <SMDS_MeshElement.hxx>

// SALOME GUI includes
#include <SUIT_ResourceMgr.h>
#include <SUIT_Desktop.h>
#include <SUIT_FileDlg.h>
#include <SUIT_Session.h>
#include <SUIT_MessageBox.h>

#include <LightApp_SelectionMgr.h>
#include <SalomeApp_Tools.h>
#include <LightApp_Application.h>
#include <SalomeApp_IntSpinBox.h>

#include <SALOME_ListIO.hxx>

#include <SVTK_ViewModel.h>
#include <SVTK_ViewWindow.h>
#include <VTKViewer_CellLocationsArray.h>

// SALOME KERNEL includes 
#include <SALOMEDS_SObject.hxx>

// OCCT includes
#include <TColStd_MapOfInteger.hxx>

// Qt includes
#include <QFrame>
#include <QVBoxLayout>
#include <QHBoxLayout>
#include <QGridLayout>
#include <QLineEdit>
#include <QPushButton>
#include <QGroupBox>
#include <QLabel>
#include <QRadioButton>
#include <QCheckBox>
#include <QButtonGroup>
#include <QList>
#include <QDir>
#include <QFileDialog>
#include <QFileInfo>
#include <QFile>
#include <QKeyEvent>

// VTK includes
#include <vtkIdList.h>
#include <vtkCellArray.h>
#include <vtkUnsignedCharArray.h>
#include <vtkUnstructuredGrid.h>
#include <vtkDataSetMapper.h>
#include <vtkProperty.h>

#define SPACING 6
#define MARGIN  11

/*!
 *  Class       : SMESHGUI_MeshPatternDlg
 *  Description : Dialog to specify filters for VTK viewer
 */

//=======================================================================
// name    : SMESHGUI_MeshPatternDlg::SMESHGUI_MeshPatternDlg
// Purpose : Constructor
//=======================================================================
SMESHGUI_MeshPatternDlg::SMESHGUI_MeshPatternDlg( SMESHGUI* theModule )
  : QDialog( SMESH::GetDesktop( theModule ) ),
    mySMESHGUI( theModule ),
    mySelectionMgr( SMESH::GetSelectionMgr( theModule ) ),
    myBusy( false ),
    myCreationDlg( 0 )
{
  setModal( false );
  setWindowTitle( tr( "CAPTION" ) );

  QVBoxLayout* aDlgLay = new QVBoxLayout( this );
  aDlgLay->setMargin( MARGIN );
  aDlgLay->setSpacing( SPACING );

  QWidget* aMainFrame = createMainFrame  ( this );
  QWidget* aBtnFrame  = createButtonFrame( this );

  aDlgLay->addWidget( aMainFrame );
  aDlgLay->addWidget( aBtnFrame );

  aDlgLay->setStretchFactor( aMainFrame, 1 );

  mySelector = (SMESH::GetViewWindow( mySMESHGUI ))->GetSelector();

  myHelpFileName = "pattern_mapping_page.html";

  Init();
}

//=======================================================================
// name    : SMESHGUI_MeshPatternDlg::createMainFrame
// Purpose : Create frame containing dialog's input fields
//=======================================================================
QWidget* SMESHGUI_MeshPatternDlg::createMainFrame (QWidget* theParent)
{
  SUIT_ResourceMgr* mgr = SMESH::GetResourceMgr( mySMESHGUI );
  QPixmap iconSlct ( mgr->loadPixmap( "SMESH", tr( "ICON_SELECT" ) ) );
  QPixmap icon2d   ( mgr->loadPixmap( "SMESH", tr( "ICON_PATTERN_2d" ) ) );
  QPixmap icon3d   ( mgr->loadPixmap( "SMESH", tr( "ICON_PATTERN_3d" ) ) );
  QPixmap iconOpen ( mgr->loadPixmap( "STD",   tr( "ICON_FILE_OPEN" ) ) );

  QPixmap iconSample2d ( mgr->loadPixmap( "SMESH", tr( "ICON_PATTERN_SAMPLE_2D" ) ) );
  QPixmap iconSample3d ( mgr->loadPixmap( "SMESH", tr( "ICON_PATTERN_SAMPLE_3D" ) ) );

  QWidget* aMainGrp = new QWidget( theParent );

  QVBoxLayout* aMainGrpLayout = new QVBoxLayout( aMainGrp );
  aMainGrpLayout->setMargin( 0 );
  aMainGrpLayout->setSpacing( SPACING );

  // Pattern type group

  QGroupBox* aTypeGrp = new QGroupBox( tr( "PATTERN_TYPE" ), aMainGrp );
  QHBoxLayout* aTypeGrpLayout = new QHBoxLayout( aTypeGrp );
  aTypeGrpLayout->setMargin( MARGIN );
  aTypeGrpLayout->setSpacing( SPACING );

  mySwitch2d = new QRadioButton( aTypeGrp );
  mySwitch3d = new QRadioButton( aTypeGrp );
  mySwitch2d->setIcon( icon2d );
  mySwitch3d->setIcon( icon3d );

  myTypeGrp = new QButtonGroup( aMainGrp );
  myTypeGrp->addButton( mySwitch2d, Type_2d );
  myTypeGrp->addButton( mySwitch3d, Type_3d );

  // ... layout widgets

  aTypeGrpLayout->addWidget( mySwitch2d );
  aTypeGrpLayout->addWidget( mySwitch3d );

  // Mesh group

  QGroupBox* aMeshGrp = new QGroupBox( tr( "SMESH_MESH" ), aMainGrp );
  QHBoxLayout* aMeshGrpLayout = new QHBoxLayout( aMeshGrp );
  aMeshGrpLayout->setMargin( MARGIN );
  aMeshGrpLayout->setSpacing( SPACING );

  QLabel* aMeshLab = new QLabel( tr( "SMESH_MESH" ), aMeshGrp );
  mySelBtn[ Mesh ] = new QPushButton( aMeshGrp );
  mySelBtn[ Mesh ]->setIcon( iconSlct );
  mySelEdit[ Mesh ] = new QLineEdit( aMeshGrp );
  mySelEdit[ Mesh ]->setReadOnly( true );

  // ... layout widgets

  aMeshGrpLayout->addWidget( aMeshLab );
  aMeshGrpLayout->addWidget( mySelBtn[ Mesh ] );
  aMeshGrpLayout->addWidget( mySelEdit[ Mesh ] );

  // Pattern group

  QGroupBox* aPatGrp = new QGroupBox( tr( "PATTERN" ), aMainGrp );
  QGridLayout* aPatGrpLayout = new QGridLayout( aPatGrp );
  aPatGrpLayout->setMargin( MARGIN );
  aPatGrpLayout->setSpacing( SPACING );

  // ... Pattern name

  QLabel* aNameLab = new QLabel( tr( "PATTERN" ), aPatGrp );
  myName = new QLineEdit( aPatGrp );
  myName->setReadOnly( true );
  myOpenBtn = new QPushButton( aPatGrp );
  myOpenBtn->setIcon( iconOpen );
  myNewBtn = new QPushButton( tr( "NEW" ), aPatGrp );

  // ... Mode selection check box
  myRefine = new QCheckBox( tr( "REFINE" ), aPatGrp );

  // ... selection widgets for Apply to geom mode
  myGeomGrp = new QFrame( aPatGrp );
  myGeomGrp->setFrameStyle( QFrame::NoFrame );
  QGridLayout* myGeomGrpLayout = new QGridLayout( myGeomGrp );
  myGeomGrpLayout->setMargin( 0 );
  myGeomGrpLayout->setSpacing( SPACING );

  for ( int i = Object; i <= Vertex2; i++ ) {
    mySelLbl[ i ] = new QLabel( myGeomGrp );
    mySelBtn[ i ] = new QPushButton( myGeomGrp );
    mySelBtn[ i ]->setIcon( iconSlct );
    mySelEdit[ i ] = new QLineEdit( myGeomGrp );
    mySelEdit[ i ]->setReadOnly( true );
    myGeomGrpLayout->addWidget( mySelLbl[ i ],  i - Object, 0 );
    myGeomGrpLayout->addWidget( mySelBtn[ i ],  i - Object, 1 );
    myGeomGrpLayout->addWidget( mySelEdit[ i ], i - Object, 2 );
  }

  // ... Widgets for refinement of existing mesh elements

  myRefineGrp = new QFrame( aPatGrp );
  myRefineGrp->setFrameStyle( QFrame::NoFrame );

  QGridLayout* myRefineGrpLayout = new QGridLayout( myRefineGrp );
  myRefineGrpLayout->setMargin( 0 );
  myRefineGrpLayout->setSpacing( SPACING );

  mySelLbl[ Ids ] = new QLabel( myRefineGrp );
  mySelBtn[ Ids ] = new QPushButton( myRefineGrp );
  mySelBtn[ Ids ]->setIcon( iconSlct );
  mySelEdit[ Ids ] = new QLineEdit( myRefineGrp );

  QLabel* aNodeLbl = new QLabel( tr( "NODE_1" ), myRefineGrp );
  myNode1          = new SalomeApp_IntSpinBox( myRefineGrp );
  myNode2Lbl       = new QLabel( tr( "NODE_2" ), myRefineGrp );
  myNode2          = new SalomeApp_IntSpinBox( myRefineGrp );

  myRefineGrpLayout->addWidget( mySelLbl[ Ids ],  0, 0 );
  myRefineGrpLayout->addWidget( mySelBtn[ Ids ],  0, 1 );
  myRefineGrpLayout->addWidget( mySelEdit[ Ids ], 0, 2 );
  myRefineGrpLayout->addWidget( aNodeLbl,         1, 0 );
  myRefineGrpLayout->addWidget( myNode1,          1, 1, 1, 2 );
  myRefineGrpLayout->addWidget( myNode2Lbl,       2, 0 );
  myRefineGrpLayout->addWidget( myNode2,          2, 1, 1, 2 );

  // ... reverse check box
  myReverseChk = new QCheckBox( tr( "REVERSE" ), aPatGrp );

  // ... CreatePoly check box
  myCreatePolygonsChk = new QCheckBox( tr( "CREATE_POLYGONS_NEAR_BOUNDARY" ), aPatGrp );
  myCreatePolyedrsChk = new QCheckBox( tr( "CREATE_POLYEDRS_NEAR_BOUNDARY" ), aPatGrp );

  // ... Pictures 2d and 3d

  myPicture2d = new SMESHGUI_PatternWidget( aPatGrp );
  myPicture2d->setSizePolicy( QSizePolicy( QSizePolicy::Expanding, QSizePolicy::Expanding ) );

  myPicture3d = new QLabel( aPatGrp );
  myPicture3d->setPixmap( iconSample3d );
  myPicture3d->setScaledContents( false );
  myPicture3d->setAlignment( Qt::AlignCenter );
  myPicture3d->setSizePolicy( QSizePolicy( QSizePolicy::Expanding, QSizePolicy::Expanding ) );

  // ... preview check box

  myPreviewChk = new QCheckBox( tr( "PREVIEW" ), aPatGrp );

  // ... layout widgets 

  aPatGrpLayout->addWidget( aNameLab,            0, 0 );
  aPatGrpLayout->addWidget( myName,              0, 1 );
  aPatGrpLayout->addWidget( myOpenBtn,           0, 2 );
  aPatGrpLayout->addWidget( myNewBtn,            0, 3 );
  aPatGrpLayout->addWidget( myRefine,            1, 0, 1, 4 );
  aPatGrpLayout->addWidget( myRefine,            1, 0, 1, 4 );
  aPatGrpLayout->addWidget( myGeomGrp,           2, 0, 1, 4 );
  aPatGrpLayout->addWidget( myRefineGrp,         3, 0, 1, 4 );
  aPatGrpLayout->addWidget( myReverseChk,        4, 0, 1, 4 );
  aPatGrpLayout->addWidget( myCreatePolygonsChk, 5, 0, 1, 4 );
  aPatGrpLayout->addWidget( myCreatePolyedrsChk, 6, 0, 1, 4 );
  aPatGrpLayout->addWidget( myPicture2d,         7, 0, 1, 4 );
  aPatGrpLayout->addWidget( myPicture3d,         8, 0, 1, 4 );
  aPatGrpLayout->addWidget( myPreviewChk,        9, 0, 1, 4 );

  // main layout
  
  aMainGrpLayout->addWidget( aTypeGrp );
  aMainGrpLayout->addWidget( aMeshGrp );
  aMainGrpLayout->addWidget( aPatGrp );

  // Connect signals and slots

  connect(myTypeGrp, SIGNAL(buttonClicked(int)), SLOT(onTypeChanged(int)));
  connect(myOpenBtn, SIGNAL(clicked()),    SLOT(onOpen()));
  connect(myNewBtn,  SIGNAL(clicked()),    SLOT(onNew()));

  connect(myReverseChk, SIGNAL(toggled(bool)), SLOT(onReverse(bool)));
  connect(myPreviewChk, SIGNAL(toggled(bool)), SLOT(onPreview(bool)));
  connect(myRefine,     SIGNAL(toggled(bool)), SLOT(onModeToggled(bool)));

  connect(myNode1, SIGNAL(valueChanged(int)), SLOT(onNodeChanged(int)));
  connect(myNode2, SIGNAL(valueChanged(int)), SLOT(onNodeChanged(int)));

  connect(mySelEdit[Ids], SIGNAL(textChanged(const QString&)), SLOT(onTextChanged(const QString&)));

  QMap< int, QPushButton* >::iterator anIter;
  for (anIter = mySelBtn.begin(); anIter != mySelBtn.end(); ++anIter)
    connect(*anIter, SIGNAL(clicked()), SLOT(onSelInputChanged()));

  return aMainGrp;
}

//=======================================================================
// name    : SMESHGUI_MeshPatternDlg::createButtonFrame
// Purpose : Create frame containing buttons
//=======================================================================
QWidget* SMESHGUI_MeshPatternDlg::createButtonFrame (QWidget* theParent)
{
  QFrame* aFrame = new QFrame(theParent);
  aFrame->setFrameStyle(QFrame::Box | QFrame::Sunken);

  myOkBtn     = new QPushButton(tr("SMESH_BUT_APPLY_AND_CLOSE"), aFrame);
  myApplyBtn  = new QPushButton(tr("SMESH_BUT_APPLY"), aFrame);
  myCloseBtn  = new QPushButton(tr("SMESH_BUT_CLOSE"), aFrame);
  myHelpBtn   = new QPushButton(tr("SMESH_BUT_HELP"),  aFrame);

  QHBoxLayout* aLay = new QHBoxLayout( aFrame );
  aLay->setMargin( MARGIN );
  aLay->setSpacing( SPACING );

  aLay->addWidget(myOkBtn);
  aLay->addWidget(myApplyBtn);
  aLay->addSpacing( 10 );
  aLay->addStretch();
  aLay->addWidget(myCloseBtn);
  aLay->addWidget(myHelpBtn);

  connect(myOkBtn,    SIGNAL(clicked()), SLOT(onOk()));
  connect(myCloseBtn, SIGNAL(clicked()), SLOT(reject()));
  connect(myApplyBtn, SIGNAL(clicked()), SLOT(onApply()));
  connect(myHelpBtn,  SIGNAL(clicked()), SLOT(onHelp()));

  return aFrame;
}

//=======================================================================
// name    : SMESHGUI_MeshPatternDlg::~SMESHGUI_MeshPatternDlg
// Purpose : Destructor
//=======================================================================
SMESHGUI_MeshPatternDlg::~SMESHGUI_MeshPatternDlg()
{
}

//=======================================================================
// name    : SMESHGUI_MeshPatternDlg::Init
// Purpose : Init dialog fields, connect signals and slots, show dialog
//=======================================================================
void SMESHGUI_MeshPatternDlg::Init()
{
  myPattern = SMESH::GetPattern();
  myPreviewActor = 0;
  myIsCreateDlgOpen = false;
  mySelInput = Mesh;
  myType = -1;
  myNbPoints = -1;
  mySMESHGUI->SetActiveDialogBox((QDialog*)this);
  myMesh = SMESH::SMESH_Mesh::_nil();

  myMeshShape = GEOM::GEOM_Object::_nil();
  myGeomObj[ Object  ] = GEOM::GEOM_Object::_nil();
  myGeomObj[ Vertex1 ] = GEOM::GEOM_Object::_nil();
  myGeomObj[ Vertex2 ] = GEOM::GEOM_Object::_nil();

  // selection and SMESHGUI
  connect(mySelectionMgr, SIGNAL(currentSelectionChanged()), SLOT(onSelectionDone()));
  connect(mySMESHGUI, SIGNAL(SignalDeactivateActiveDialog()), SLOT(onDeactivate()));
  connect(mySMESHGUI, SIGNAL(SignalCloseAllDialogs()), SLOT(reject()));

  myTypeGrp->button(Type_2d)->setChecked(true);
  onTypeChanged(Type_2d);
  onModeToggled(isRefine());

  updateGeometry();

  resize(100,100);

  activateSelection();
  onSelectionDone();

  this->show();
}

//=======================================================================
// name    : SMESHGUI_MeshPatternDlg::isValid
// Purpose : Verify validity of entry data
//=======================================================================
bool SMESHGUI_MeshPatternDlg::isValid (const bool theMess)
{
  if (isRefine())
  {
    QString msg;
    bool ok = true;
    ok = myNode1->isValid( msg, theMess ) && ok;
    if (myType == Type_3d)
      ok = myNode2->isValid( msg, theMess ) && ok;
    if( !ok ) {
      if( theMess ) {
        QString str( tr( "SMESH_INCORRECT_INPUT" ) );
        if ( !msg.isEmpty() )
          str += "\n" + msg;
        SUIT_MessageBox::critical( this, tr( "SMESH_ERROR" ), str );
      }
      return false;
    }
  }

  QList<int> ids;
  if ((isRefine() &&
       (myMesh->_is_nil() || !getIds(ids) || getNode(false) < 0 ||
        (myType == Type_3d && (getNode(true) < 0 || getNode(false) == getNode(true)))))
      ||
      (!isRefine() &&
       (myMesh->_is_nil() || myMeshShape->_is_nil() || myGeomObj[ Object ]->_is_nil() ||
        myGeomObj[ Vertex1 ]->_is_nil() || (myType == Type_3d && myGeomObj[ Vertex2 ]->_is_nil()))))
  {
    if (theMess)
      SUIT_MessageBox::information(this, tr("SMESH_INSUFFICIENT_DATA"),
                                   tr("SMESHGUI_INVALID_PARAMETERS"));
    return false;
  }

  if ( myName->text().isEmpty() ) {
    if (theMess)
      SUIT_MessageBox::information(this, tr("SMESH_INSUFFICIENT_DATA"),
                                   tr("SMESHGUI_INVALID_PARAMETERS"));
    return false;
  }

  return true;
}

//=======================================================================
// name    : SMESHGUI_MeshPatternDlg::onApply
// Purpose : SLOT called when "Apply" button pressed.
//=======================================================================
bool SMESHGUI_MeshPatternDlg::onApply()
{
  try {
    if (!isValid())
      return false;

    erasePreview();

    if (isRefine()) { // Refining existing mesh elements
      {
        QStringList aParameters;
        aParameters << myNode1->text();
        if(myType == Type_3d )
          aParameters << myNode2->text();
        myMesh->SetParameters( aParameters.join(":").toLatin1().constData() );
      }
      QList<int> ids;
      getIds(ids);
      SMESH::long_array_var varIds = new SMESH::long_array();
      varIds->length(ids.count());
      int i = 0;
      for (QList<int>::iterator it = ids.begin(); it != ids.end(); ++it)
        varIds[i++] = *it;
      myType == Type_2d
        ? myPattern->ApplyToMeshFaces  (myMesh, varIds, getNode(false), myReverseChk->isChecked())
        : myPattern->ApplyToHexahedrons(myMesh, varIds, getNode(false), getNode(true));

    } else { // Applying a pattern to geometrical object
      if (myType == Type_2d)
        myPattern->ApplyToFace(myGeomObj[Object], myGeomObj[Vertex1], myReverseChk->isChecked());
      else
        myPattern->ApplyTo3DBlock(myGeomObj[Object], myGeomObj[Vertex1], myGeomObj[Vertex2]);
    }

    bool toCreatePolygons = myCreatePolygonsChk->isChecked();
    bool toCreatePolyedrs = myCreatePolyedrsChk->isChecked();
    if ( myPattern->MakeMesh( myMesh, toCreatePolygons, toCreatePolyedrs ) ) {
      //mySelectionMgr->clearSelected();
      bool autoUpdate = SMESHGUI::automaticUpdate();
      if (!isRefine() && autoUpdate) {
        _PTR(SObject) aSO = SMESH::FindSObject(myMesh.in());
        SMESH_Actor* anActor = SMESH::FindActorByEntry(aSO->GetID().c_str());
        if (!anActor) {
          anActor = SMESH::CreateActor(aSO->GetStudy(), aSO->GetID().c_str());
          if (anActor) {
            SMESH::DisplayActor(SMESH::GetActiveWindow(), anActor);
            SMESH::FitAll();
          }
        }
      }
      mySelectionMgr->clearSelected();
      SMESH::UpdateView();
      SMESHGUI::Modified();

      mySMESHGUI->updateObjBrowser(true);

      mySelEdit[ Ids ]->setText("");

      return true;
    } else {
      SUIT_MessageBox::information(this, tr("SMESH_ERROR"),
                                   tr("SMESH_OPERATION_FAILED"));
      return false;
    }
  } catch (const SALOME::SALOME_Exception& S_ex) {
    SalomeApp_Tools::QtCatchCorbaException(S_ex);
  } catch (...) {
  }

  return false;
}

//=======================================================================
// name    : SMESHGUI_MeshPatternDlg::onOk
// Purpose : SLOT called when "Ok" button pressed.
//=======================================================================
void SMESHGUI_MeshPatternDlg::onOk()
{
  if (onApply())
    reject();
}

//=======================================================================
// name    : SMESHGUI_MeshPatternDlg::reject
// Purpose : SLOT called when "Close" button pressed. Close dialog
//=======================================================================
void SMESHGUI_MeshPatternDlg::reject()
{
  mySelectionMgr->clearFilters();
  SMESH::SetPickable();
  if ( SVTK_ViewWindow* aViewWindow = SMESH::GetViewWindow( mySMESHGUI ))
    aViewWindow->SetSelectionMode(ActorSelection);
  disconnect(mySelectionMgr, 0, this, 0);
  disconnect(mySMESHGUI, 0, this, 0);
  mySMESHGUI->ResetState();
  erasePreview();
  QDialog::reject();
}

//=================================================================================
// function : onHelp()
// purpose  :
//=================================================================================
void SMESHGUI_MeshPatternDlg::onHelp()
{
  LightApp_Application* app = (LightApp_Application*)(SUIT_Session::session()->activeApplication());
  if (app) 
    app->onHelpContextModule(mySMESHGUI ? app->moduleName(mySMESHGUI->moduleName()) : QString(""), myHelpFileName);
  else {
                QString platform;
#ifdef WIN32
                platform = "winapplication";
#else
                platform = "application";
#endif
    SUIT_MessageBox::warning(this, tr("WRN_WARNING"),
                             tr("EXTERNAL_BROWSER_CANNOT_SHOW_PAGE").
                             arg(app->resourceMgr()->stringValue("ExternalBrowser", 
                                                                 platform)).
                             arg(myHelpFileName));
  }
}

//=======================================================================
// name    : SMESHGUI_MeshPatternDlg::onSelectionDone
// Purpose : SLOT called when selection changed
//=======================================================================
void SMESHGUI_MeshPatternDlg::onSelectionDone()
{
  if (myBusy)
    return;

  try {
    if (mySelInput == Mesh) {
      SALOME_ListIO aList;
      mySelectionMgr->selectedObjects(aList,SVTK_Viewer::Type());
      if (aList.Extent() != 1)
        return;

      // Retrieve mesh from selection
      Handle(SALOME_InteractiveObject) anIO = aList.First();
      SMESH::SMESH_Mesh_var aMesh = SMESH::IObjectToInterface<SMESH::SMESH_Mesh>(anIO);
      if (aMesh->_is_nil())
        return;

      // Get geom object corresponding to the mesh
      _PTR(SObject) aSO = SMESH::FindSObject(aMesh.in());
      myMeshShape = SMESH::GetGeom(aSO);

      // Clear fields of geom objects if mesh was changed
      if (myMesh != aMesh) {
        for (int i = Object; i <= Ids; i++) {
          myGeomObj[ i ] = GEOM::GEOM_Object::_nil();
          mySelEdit[ i ]->setText("");
        }
      }

      myMesh = aMesh;

      // Set name of mesh in line edit
      QString aName;
      SMESH::GetNameOfSelectedIObjects(mySelectionMgr, aName);
      mySelEdit[ Mesh ]->setText(aName);

    } else if (mySelInput == Ids) {
      SALOME_ListIO aList;
      mySelectionMgr->selectedObjects(aList,SVTK_Viewer::Type());
      if (aList.Extent() != 1)
        return;

      QString anIds;
      if (!SMESH::GetNameOfSelectedElements(mySelector, aList.First(), anIds))
        anIds = "";

      myBusy = true;
      mySelEdit[ Ids ]->setText(anIds);
      myBusy = false;

    } else {
      SALOME_ListIO aList;
      mySelectionMgr->selectedObjects(aList, SVTK_Viewer::Type());
      if (aList.Extent() != 1)
        return;

      // Get geom object from selection
      Handle(SALOME_InteractiveObject) anIO = aList.First();
      GEOM::GEOM_Object_var anObj = SMESH::IObjectToInterface<GEOM::GEOM_Object>(anIO);
      if (anObj->_is_nil())
        return;

      // Clear fields of vertexes if face or 3d block was changed
      if (anObj != myGeomObj[ mySelInput ] && mySelInput == Object) {
        for (int i = Vertex1; i <= Vertex2; i++) {
          myGeomObj[ i ] = GEOM::GEOM_Object::_nil();
          mySelEdit[ i ]->setText("");
        }
      }

      myGeomObj[ mySelInput ] = anObj;

      // Set name of geom object in line edit
      QString aName;
      SMESH::GetNameOfSelectedIObjects(mySelectionMgr, aName);
      mySelEdit[ mySelInput ]->setText(aName);
    }
  } catch (const SALOME::SALOME_Exception& S_ex) {
    SalomeApp_Tools::QtCatchCorbaException(S_ex);
    resetSelInput();
  } catch (...) {
    resetSelInput();
  }

  updateWgState();
  displayPreview();
}

//=======================================================================
// name    : SMESHGUI_MeshPatternDlg::resetSelInput
// Purpose : Reset fields corresponding to the current selection input
//=======================================================================
void SMESHGUI_MeshPatternDlg::resetSelInput()
{
  if (mySelInput == Mesh)
  {
    myMesh = SMESH::SMESH_Mesh::_nil();
    myMeshShape = GEOM::GEOM_Object::_nil();
  }

  else
    myGeomObj[ mySelInput ] = GEOM::GEOM_Object::_nil();

  mySelEdit[ mySelInput ]->setText("");
}

//=======================================================================
// name    : SMESHGUI_MeshPatternDlg::onDeactivate
// Purpose : SLOT called when dialog must be deativated
//=======================================================================
void SMESHGUI_MeshPatternDlg::onDeactivate()
{
  mySelectionMgr->clearFilters();
  //if (myReverseChk->isChecked())
  //  erasePreview();
  disconnect(mySelectionMgr, 0, this, 0);
  setEnabled(false);
}

//=======================================================================
// name    : SMESHGUI_MeshPatternDlg::enterEvent
// Purpose : Event filter
//=======================================================================
void SMESHGUI_MeshPatternDlg::enterEvent (QEvent*)
{
  if (myIsCreateDlgOpen)
    return;

  if (myReverseChk->isChecked())
    displayPreview();
  mySMESHGUI->EmitSignalDeactivateDialog();
  setEnabled(true);
  activateSelection();
  connect(mySelectionMgr, SIGNAL(currentSelectionChanged()), SLOT(onSelectionDone()));
  onTextChanged(mySelEdit[Ids]->text());
}

//=======================================================================
// name    : SMESHGUI_MeshPatternDlg::onSelInputChanged
// Purpose : SLOT. Called when -> button clicked.
//           Change current selection input field
//=======================================================================
void SMESHGUI_MeshPatternDlg::onSelInputChanged()
{
  const QObject* aSender = sender();
  for (int i = Mesh; i <= Ids; i++)
    if (aSender == mySelBtn[ i ])
      mySelInput = i;

  activateSelection();
  onSelectionDone();
}

//=======================================================================
// name    : SMESHGUI_MeshPatternDlg::prepareFilters
// Purpose : Prepare filters for dialog
//=======================================================================
QStringList SMESHGUI_MeshPatternDlg::prepareFilters() const
{
  static QStringList aList;
  if (aList.isEmpty())
  {
    aList.append(tr("PATTERN_FILT"));
    //aList.append(tr("ALL_FILES_FILTER"));
  }

  return aList;
}

//=======================================================================
// name    : SMESHGUI_MeshPatternDlg::autoExtension
// Purpose : Append extension to the file name
//=======================================================================
QString SMESHGUI_MeshPatternDlg::autoExtension (const QString& theFileName) const
{
  QString anExt = theFileName.section('.', -1);
  return anExt != "smp" && anExt != "SMP" ? theFileName + ".smp" : theFileName;
}

//=======================================================================
// name    : SMESHGUI_MeshPatternDlg::onOpen
// Purpose : SLOT. Called when "Open" button clicked.
//           Displays file open dialog
//=======================================================================
void SMESHGUI_MeshPatternDlg::onOpen()
{
  SUIT_FileDlg* aDlg = new SUIT_FileDlg (this, true);
  aDlg->setWindowTitle(tr("LOAD_PATTERN"));
  aDlg->setFileMode(QFileDialog::ExistingFile);
  aDlg->setFilters(prepareFilters());
  if (!myName->text().isEmpty())
    aDlg->selectFile(myName->text() + ".smp");
  QPushButton* anOkBtn = qFindChild<QPushButton*>( aDlg, "OK" );
  if (anOkBtn != 0)
    anOkBtn->setText(tr("SMESH_BUT_OK"));

  if (aDlg->exec() != Accepted)
    return;

  QString fName = aDlg->selectedFile();
  if (fName.isEmpty())
    return;

  if (QFileInfo(fName).suffix().isEmpty())
    fName = autoExtension(fName);

  fName = QDir::convertSeparators(fName);

  QString prev = QDir::convertSeparators(myName->text());
  if (prev == fName)
    return;

  // Read string from file
  QFile aFile(fName);
  if (!aFile.open(QIODevice::ReadOnly)) {
    SUIT_MessageBox::information(this, tr("SMESH_ERROR"),
                                 tr("ERROR_OF_OPENING"));
    return;
  }

  QByteArray aDataArray = aFile.readAll();
  if (aDataArray.isEmpty()) {
    SUIT_MessageBox::information(this, tr("SMESH_ERROR"),
                                 tr("ERROR_OF_READING"));
    return;
  }

  if (loadFromFile(aDataArray))
    myName->setText(QFileInfo(fName).completeBaseName());

  updateWgState();
  displayPreview();
}

//=======================================================================
// name    : SMESHGUI_MeshPatternDlg::onCloseCreationDlg
// Purpose : SLOT. Called when "Pattern creation" dialog closed with "Close"
//=======================================================================
void SMESHGUI_MeshPatternDlg::onCloseCreationDlg()
{
  setEnabled(true);
  myIsCreateDlgOpen = false;
}

//=======================================================================
// name    : SMESHGUI_MeshPatternDlg::onOkCreationDlg
// Purpose : SLOT. Called when "Pattern creation" dialog closed with OK
//           or SAVE buttons. Initialize myPattern field. Redisplay preview
//=======================================================================
void SMESHGUI_MeshPatternDlg::onOkCreationDlg()
{
  myPattern = SMESH::SMESH_Pattern::_duplicate(myCreationDlg->GetPattern());
  myName->setText(myCreationDlg->GetPatternName());

  updateWgState();
  displayPreview();

  setEnabled(true);
  myIsCreateDlgOpen = false;
}

//=======================================================================
// name    : SMESHGUI_MeshPatternDlg::onNew
// Purpose : SLOT. Called when "New..." button clicked. Create new pattern
//=======================================================================
void SMESHGUI_MeshPatternDlg::onNew()
{
  setEnabled(false);
  myIsCreateDlgOpen = true;
  if (myCreationDlg == 0)
  {
    myCreationDlg = new SMESHGUI_CreatePatternDlg( mySMESHGUI, myType);
    connect(myCreationDlg, SIGNAL(NewPattern()), SLOT(onOkCreationDlg()));
    connect(myCreationDlg, SIGNAL(Close()), SLOT(onCloseCreationDlg()));
  }
  else
    myCreationDlg->Init(myType);

  myCreationDlg->SetMesh(myMesh);
  myCreationDlg->show();
}

//=======================================================================
// name    : SMESHGUI_MeshPatternDlg::onReverse
// Purpose : SLOT. Called when state of "Reverse order..." checkbox chaged
//           Calculate new points of the mesh to be created. Redisplay preview
//=======================================================================
void SMESHGUI_MeshPatternDlg::onReverse (bool)
{
  displayPreview();
}

//=======================================================================

// name    : SMESHGUI_MeshPatternDlg::onPreview
// Purpose : SLOT. Called when state of "Preview" checkbox changed
//           Display/Erase preview
//=======================================================================
void SMESHGUI_MeshPatternDlg::onPreview (bool)
{
  displayPreview();
}

//=======================================================================
// name    : SMESHGUI_MeshPatternDlg::displayPreview
// Purpose : Display preview
//=======================================================================
void SMESHGUI_MeshPatternDlg::displayPreview()
{
  try {
    // Redisplay preview in dialog
    SMESH::point_array_var pnts = myPattern->GetPoints();
    SMESH::long_array_var keyPoints = myPattern->GetKeyPoints();
    SMESH::array_of_long_array_var elemPoints = myPattern->GetElementPoints(false);

    if (pnts->length()       == 0 ||
        keyPoints->length()  == 0 ||
        elemPoints->length() == 0) {
      erasePreview();
      return;
    } else {
      PointVector aPoints(pnts->length());
      QVector<int> aKeyPoints(keyPoints->length());
      ConnectivityVector anElemPoints(elemPoints->length());

      for (int i = 0, n = pnts->length(); i < n; i++)
        aPoints[ i ] = pnts[ i ];

      for (int i2 = 0, n2 = keyPoints->length(); i2 < n2; i2++)
        aKeyPoints[ i2 ] = keyPoints[ i2 ];

      for (int i3 = 0, n3 = elemPoints->length(); i3 < n3; i3++) {
        QVector<int> aVec(elemPoints[ i3 ].length());
        for (int i4 = 0, n4 = elemPoints[ i3 ].length(); i4 < n4; i4++)
          aVec[ i4 ] = elemPoints[ i3 ][ i4 ];

        anElemPoints[ i3 ] = aVec;
      }

      myPicture2d->SetPoints(aPoints, aKeyPoints, anElemPoints);
    }

    // Redisplay preview in 3D viewer
    if (myPreviewActor != 0) {
      if (SVTK_ViewWindow* vf = SMESH::GetCurrentVtkView()) {
        vf->RemoveActor(myPreviewActor);
        vf->Repaint();
      }
      myPreviewActor->Delete();
      myPreviewActor = 0;
    }

    if (!myPreviewChk->isChecked() || !isValid(false))
      return;

    vtkUnstructuredGrid* aGrid = getGrid();
    if (aGrid == 0)
      return;

    // Create and display actor
    vtkDataSetMapper* aMapper = vtkDataSetMapper::New();
    aMapper->SetInputData(aGrid);

    myPreviewActor = SALOME_Actor::New();
    myPreviewActor->PickableOff();
    myPreviewActor->SetMapper(aMapper);

    vtkProperty* aProp = vtkProperty::New();
    aProp->SetRepresentationToWireframe();
    aProp->SetColor(250, 0, 250);
    if (SMESH::FindActorByObject(myMesh))
      aProp->SetLineWidth( SMESH::GetFloat( "SMESH:element_width", 1 ) + 1 );
    else
      aProp->SetLineWidth(1);
    myPreviewActor->SetProperty(aProp);

    myPreviewActor->SetRepresentation(3);

    SMESH::GetCurrentVtkView()->AddActor(myPreviewActor);
    SMESH::GetCurrentVtkView()->Repaint();

    aProp->Delete();
    aGrid->Delete();
  } catch (const SALOME::SALOME_Exception& S_ex) {
    SalomeApp_Tools::QtCatchCorbaException(S_ex);
    erasePreview();
  } catch (...) {
    erasePreview();
  }
}

//=======================================================================
// name    : SMESHGUI_MeshPatternDlg::erasePreview
// Purpose : Erase preview
//=======================================================================
void SMESHGUI_MeshPatternDlg::erasePreview()
{
  // Erase preview in 2D viewer
  myPicture2d->SetPoints(PointVector(), QVector<int>(), ConnectivityVector());

  // Erase preview in 3D viewer
  if (myPreviewActor == 0)
    return;


  if (SVTK_ViewWindow* vf = SMESH::GetCurrentVtkView())
  {
    vf->RemoveActor(myPreviewActor);
    vf->Repaint();
  }
  myPreviewActor->Delete();
  myPreviewActor = 0;
}

//=======================================================================
// name    : SMESHGUI_MeshPatternDlg::updateWgState
// Purpose : Enable/disable selection widgets
//=======================================================================
void SMESHGUI_MeshPatternDlg::updateWgState()
{
  if (myMesh->_is_nil()) {
    for (int i = Object; i <= Ids; i++) {
      mySelBtn [ i ]->setEnabled(false);
      mySelEdit[ i ]->setEnabled(false);
      mySelEdit[ i ]->setText("");
    }
    myNode1->setEnabled(false);
    myNode2->setEnabled(false);
    myNode1->setRange(0, 0);
    myNode2->setRange(0, 0);
  } else {
    mySelBtn [ Object ]->setEnabled(true);
    mySelEdit[ Object ]->setEnabled(true);
    mySelBtn [ Ids ]   ->setEnabled(true);
    mySelEdit[ Ids ]   ->setEnabled(true);

    if (myGeomObj[ Object ]->_is_nil()) {
      for (int i = Vertex1; i <= Vertex2; i++) {
        mySelBtn [ i ]->setEnabled(false);
        mySelEdit[ i ]->setEnabled(false);
        mySelEdit[ i ]->setText("");
      }
    } else {
      for (int i = Object; i <= Vertex2; i++) {
        mySelBtn [ i ]->setEnabled(true);
        mySelEdit[ i ]->setEnabled(true);
      }
    }

    QList<int> ids;
    if (!CORBA::is_nil(myPattern)/* && getIds(ids)*/) {
      SMESH::long_array_var keyPoints = myPattern->GetKeyPoints();
      if (keyPoints->length()) {
        myNode1->setEnabled(true);
        myNode2->setEnabled(true);
        myNode1->setRange(1, keyPoints->length());
        myNode2->setRange(1, keyPoints->length());
        return;
      }
    }

    myNode1->setEnabled(false);
    myNode2->setEnabled(false);
    myNode1->setRange(0, 0);
    myNode2->setRange(0, 0);
  }
}

//=======================================================================
// name    : SMESHGUI_MeshPatternDlg::activateSelection
// Purpose : Activate selection in accordance with current selection input
//=======================================================================
void SMESHGUI_MeshPatternDlg::activateSelection()
{
  mySelectionMgr->clearFilters();
  if (mySelInput == Ids) {
    SMESH_Actor* anActor = SMESH::FindActorByObject(myMesh);
    if (anActor)
      SMESH::SetPickable(anActor);

    if (myType == Type_2d)
      {
        if ( SVTK_ViewWindow* aViewWindow = SMESH::GetViewWindow( mySMESHGUI ))
          aViewWindow->SetSelectionMode(FaceSelection);
      }
    else
      {
        if ( SVTK_ViewWindow* aViewWindow = SMESH::GetViewWindow( mySMESHGUI ))
          aViewWindow->SetSelectionMode(CellSelection);
      }
  }
  else {
    SMESH::SetPickable();
    //mySelectionMgr->setSelectionModes(ActorSelection);
    if ( SVTK_ViewWindow* aViewWindow = SMESH::GetViewWindow( mySMESHGUI ))
      aViewWindow->SetSelectionMode(ActorSelection);
  }

  if (mySelInput == Object && !myMeshShape->_is_nil()) {
    if (myType == Type_2d) {
      if (myNbPoints > 0)
        mySelectionMgr->installFilter
          (new SMESH_NumberFilter ("GEOM", TopAbs_VERTEX, myNbPoints, TopAbs_FACE, myMeshShape));
      else
        mySelectionMgr->installFilter
          (new SMESH_NumberFilter ("GEOM", TopAbs_SHAPE, myNbPoints, TopAbs_FACE, myMeshShape));
    } else {
      TColStd_MapOfInteger aTypes;
      aTypes.Add(TopAbs_SHELL);
      aTypes.Add(TopAbs_SOLID);
      mySelectionMgr->installFilter
        (new SMESH_NumberFilter ("GEOM", TopAbs_FACE, 6, aTypes, myMeshShape, true));
    }
  } else if ((mySelInput == Vertex1 || mySelInput == Vertex2) && !myGeomObj[ Object ]->_is_nil()) {
    mySelectionMgr->installFilter
      (new SMESH_NumberFilter ("GEOM", TopAbs_SHAPE, 1, TopAbs_VERTEX, myGeomObj[ Object ]));
  } else {
  }
}

//=======================================================================
// name    : SMESHGUI_MeshPatternDlg::loadFromFile
// Purpose : Load pattern from file
//=======================================================================
bool SMESHGUI_MeshPatternDlg::loadFromFile (const QString& theName)
{
  try {
    SMESH::SMESH_Pattern_var aPattern = SMESH::GetPattern();

    if (!aPattern->LoadFromFile(theName.toLatin1().data()) ||
        (myType == Type_2d && !aPattern->Is2D())) {
      SMESH::SMESH_Pattern::ErrorCode aCode = aPattern->GetErrorCode();
      QString aMess;
      if      (aCode == SMESH::SMESH_Pattern::ERR_READ_NB_POINTS     ) aMess = tr("ERR_READ_NB_POINTS");
      else if (aCode == SMESH::SMESH_Pattern::ERR_READ_POINT_COORDS  ) aMess = tr("ERR_READ_POINT_COORDS");
      else if (aCode == SMESH::SMESH_Pattern::ERR_READ_TOO_FEW_POINTS) aMess = tr("ERR_READ_TOO_FEW_POINTS");
      else if (aCode == SMESH::SMESH_Pattern::ERR_READ_3D_COORD      ) aMess = tr("ERR_READ_3D_COORD");
      else if (aCode == SMESH::SMESH_Pattern::ERR_READ_NO_KEYPOINT   ) aMess = tr("ERR_READ_NO_KEYPOINT");
      else if (aCode == SMESH::SMESH_Pattern::ERR_READ_BAD_INDEX     ) aMess = tr("ERR_READ_BAD_INDEX");
      else if (aCode == SMESH::SMESH_Pattern::ERR_READ_ELEM_POINTS   ) aMess = tr("ERR_READ_ELEM_POINTS");
      else if (aCode == SMESH::SMESH_Pattern::ERR_READ_NO_ELEMS      ) aMess = tr("ERR_READ_NO_ELEMS");
      else if (aCode == SMESH::SMESH_Pattern::ERR_READ_BAD_KEY_POINT ) aMess = tr("ERR_READ_BAD_KEY_POINT");
      else                                                             aMess = tr("ERROR_OF_LOADING");

      SUIT_MessageBox::information(this, tr("SMESH_ERROR"), aMess);
      return false;
    } else {
      myPattern = aPattern;
      return true;
    }
  } catch (const SALOME::SALOME_Exception& S_ex) {
    SalomeApp_Tools::QtCatchCorbaException(S_ex);
    SUIT_MessageBox::information(this, tr("SMESH_ERROR"),
                                 tr("ERROR_OF_LOADING") );
    return false;
  }
}

//=======================================================================
// name    : SMESHGUI_MeshPatternDlg::onTypeChanged
// Purpose : SLOT. Called when pattern type changed.
//           Change dialog's look and feel
//=======================================================================
void SMESHGUI_MeshPatternDlg::onTypeChanged (int theType)
{
  if (myType == theType)
    return;

  myType = theType;

  myNbPoints = -1;
  myGeomObj[ Object  ] = GEOM::GEOM_Object::_nil();
  myGeomObj[ Vertex1 ] = GEOM::GEOM_Object::_nil();
  myGeomObj[ Vertex2 ] = GEOM::GEOM_Object::_nil();
  myPattern = SMESH::GetPattern();

  myName->setText("");
  mySelEdit[ Object  ]->setText("");
  mySelEdit[ Vertex1 ]->setText("");
  mySelEdit[ Vertex2 ]->setText("");
  mySelEdit[ Ids ]    ->setText("");
  myCreatePolygonsChk->show();
  myCreatePolyedrsChk->show();

  if (theType == Type_2d) {
    // Geom widgets
    mySelLbl [ Vertex2 ]->hide();
    mySelBtn [ Vertex2 ]->hide();
    mySelEdit[ Vertex2 ]->hide();
    myReverseChk->show();
    myPicture2d->show();
    myPicture3d->hide();
    mySelLbl[ Object  ]->setText(tr("FACE"));
    mySelLbl[ Vertex1 ]->setText(tr("VERTEX"));
    // Refine widgets
    mySelLbl[ Ids ]->setText(tr("MESH_FACES"));
    myNode2Lbl->hide();
    myNode2   ->hide();
  } else {
    // Geom widgets
    mySelLbl [ Vertex2 ]->show();
    mySelBtn [ Vertex2 ]->show();
    mySelEdit[ Vertex2 ]->show();
    myReverseChk->hide();
    myPicture2d->hide();
    myPicture3d->show();
    mySelLbl[ Object  ]->setText(tr("3D_BLOCK"));
    mySelLbl[ Vertex1 ]->setText(tr("VERTEX1"));
    mySelLbl[ Vertex2 ]->setText(tr("VERTEX2"));
    // Refine widgets
    mySelLbl[ Ids ]->setText(tr("MESH_VOLUMES"));
    myNode2Lbl->show();
    myNode2   ->show();
  }

  mySelInput = Mesh;
  activateSelection();
  updateWgState();
  displayPreview();
}

//=======================================================================
// name    : SMESHGUI_MeshPatternDlg::getGrid
// Purpose : Get unstructured grid for pattern
//=======================================================================
vtkUnstructuredGrid* SMESHGUI_MeshPatternDlg::getGrid()
{
  try {
    // Get points from pattern
    SMESH::point_array_var pnts;
    QList<int> ids;
    if (isRefine() && getIds(ids)) {
      SMESH::long_array_var varIds = new SMESH::long_array();
      varIds->length(ids.count());
      int i = 0;
      for (QList<int>::iterator it = ids.begin(); it != ids.end(); ++it)
        varIds[i++] = *it;
      pnts = myType == Type_2d
        ? myPattern->ApplyToMeshFaces  (myMesh, varIds, getNode(false), myReverseChk->isChecked())
        : myPattern->ApplyToHexahedrons(myMesh, varIds, getNode(false), getNode(true));
    } else {
      pnts = myType == Type_2d
        ? myPattern->ApplyToFace   (myGeomObj[ Object ], myGeomObj[ Vertex1 ], myReverseChk->isChecked())
      : myPattern->ApplyTo3DBlock(myGeomObj[ Object ], myGeomObj[ Vertex1 ], myGeomObj[ Vertex2 ]);
    }

    SMESH::array_of_long_array_var elemPoints = myPattern->GetElementPoints(true);

    if (pnts->length() == 0 || elemPoints->length() == 0)
      return 0;

    // to do : to be removed /////////////////////////////////////////////

#ifdef DEB_SLN
    for (int i1 = 0, n1 = pnts->length(); i1 < n1; i1++)
      printf("%d: %g %g %g\n", i1, pnts[ i1 ].x, pnts[ i1 ].y, pnts[ i1 ].z);

    printf("\nELEMENTS : \n");
    for (int i2 = 0, n2 = elemPoints->length(); i2 < n2; i2++)
    {

      printf("%d: ", i2);
      for (int i3 = 0, n3 = elemPoints[ i2 ].length(); i3 < n3; i3++)
        printf("%d ", elemPoints[ i2 ][ i3 ]);

      printf("\n");

    }
#endif
    //////////////////////////////////////////////////////////////////////

    // Calculate number of points used for cell
    vtkIdType aNbCells = elemPoints->length();
    vtkIdType aCellsSize = 0;
    for (int i = 0, n = elemPoints->length(); i < n; i++)
      aCellsSize += elemPoints[ i ].length();

    // Create unstructured grid and other  usefull arrays
    vtkUnstructuredGrid* aGrid = vtkUnstructuredGrid::New();

    vtkCellArray* aConnectivity = vtkCellArray::New();
    aConnectivity->Allocate(aCellsSize, 0);

    vtkPoints* aPoints = vtkPoints::New();
    aPoints->SetNumberOfPoints(pnts->length());

    vtkUnsignedCharArray* aCellTypesArray = vtkUnsignedCharArray::New();
    aCellTypesArray->SetNumberOfComponents(1);
    aCellTypesArray->Allocate(aNbCells * aCellTypesArray->GetNumberOfComponents());

    vtkIdList *anIdList = vtkIdList::New();

    // Fill array of points
    for (int p = 0, nbPnt = pnts->length(); p < nbPnt; p++)
      aPoints->SetPoint(p, pnts[ p ].x, pnts[ p ].y, pnts[ p ].z);

    for (int e = 0, nbElem = elemPoints->length(); e < nbElem; e++) {
      int nbPoints = elemPoints[ e ].length();
      anIdList->SetNumberOfIds(nbPoints);
      for (int i = 0; i < nbPoints; i++)
        anIdList->SetId(i, elemPoints[ e ][ i ]);

      aConnectivity->InsertNextCell(anIdList);

      if      (nbPoints == 3) aCellTypesArray->InsertNextValue(VTK_TRIANGLE);
      else if (nbPoints == 5) aCellTypesArray->InsertNextValue(VTK_PYRAMID);
      else if (nbPoints == 6) aCellTypesArray->InsertNextValue(VTK_WEDGE);
      else if (nbPoints == 8) aCellTypesArray->InsertNextValue(VTK_HEXAHEDRON);
      else if (nbPoints == 4 && myType == Type_2d) aCellTypesArray->InsertNextValue(VTK_QUAD);
      else if (nbPoints == 4 && myType == Type_3d) aCellTypesArray->InsertNextValue(VTK_TETRA);
      else aCellTypesArray->InsertNextValue(VTK_EMPTY_CELL);
    }

    VTKViewer_CellLocationsArray* aCellLocationsArray = VTKViewer_CellLocationsArray::New();
    aCellLocationsArray->SetNumberOfComponents(1);
    aCellLocationsArray->SetNumberOfTuples(aNbCells);

    aConnectivity->InitTraversal();
    for (vtkIdType idType = 0, *pts, npts; aConnectivity->GetNextCell(npts, pts); idType++)
      aCellLocationsArray->SetValue(idType, aConnectivity->GetTraversalLocation(npts));

    aGrid->SetPoints(aPoints);
    aGrid->SetCells(aCellTypesArray, aCellLocationsArray,aConnectivity);

    aConnectivity->Delete();
    aPoints->Delete();
    aCellTypesArray->Delete();
    anIdList->Delete();
    aCellLocationsArray->Delete();

    return aGrid;
  } catch (...) {
    return 0;
  }
}

//=======================================================================
// name    : onModeToggled
// Purpose :
//=======================================================================
void SMESHGUI_MeshPatternDlg::onModeToggled (bool on)
{
  on ? myRefineGrp->show() : myRefineGrp->hide();
  on ? myGeomGrp->hide()   : myGeomGrp->show();

  displayPreview();
}

//=======================================================================
// name    : isRefine
// Purpose :
//=======================================================================
bool SMESHGUI_MeshPatternDlg::isRefine() const
{
  return myRefine->isChecked();
}

//=======================================================================
// name    : onTextChanged
// Purpose :
//=======================================================================
void SMESHGUI_MeshPatternDlg::onTextChanged (const QString& theNewText)
{
  if (myBusy || !isRefine())
    return;

  myBusy = true;

  if (mySelInput != Ids) {
    mySelInput = Ids;
    activateSelection();
  }

  // hilight entered elements/nodes
  SMDS_Mesh* aMesh = 0;
  SMESH_Actor* anActor = SMESH::FindActorByObject(myMesh);
  if (anActor)
    aMesh = anActor->GetObject()->GetMesh();

  if (aMesh) {
    QStringList aListId = theNewText.split(" ", QString::SkipEmptyParts);

    TColStd_MapOfInteger newIndices;

    for (int i = 0; i < aListId.count(); i++) {
      const SMDS_MeshElement * e = aMesh->FindElement(aListId[ i ].toInt());
      if (e && e->GetType() == (myType == Type_2d ? SMDSAbs_Face : SMDSAbs_Volume))
        newIndices.Add(e->GetID());
    }
    mySelector->AddOrRemoveIndex( anActor->getIO(), newIndices, false);
    if ( SVTK_ViewWindow* aViewWindow = SMESH::GetViewWindow( mySMESHGUI ))
      aViewWindow->highlight( anActor->getIO(), true, true );
  }

  myBusy = false;

  displayPreview();
}

//=======================================================================
// name    : onNodeChanged
// Purpose :
//=======================================================================
void SMESHGUI_MeshPatternDlg::onNodeChanged (int value)
{
  if (myType == Type_3d) {
    SalomeApp_IntSpinBox* first = (SalomeApp_IntSpinBox*)sender();
    SalomeApp_IntSpinBox* second = first == myNode1 ? myNode2 : myNode1;
    int secondVal = second->value();
    if (secondVal == value) {
      secondVal = value == second->maximum() ? second->minimum() : value + 1;
      bool blocked = second->signalsBlocked();
      second->blockSignals(true);
      second->setValue(secondVal);
      second->blockSignals(blocked);
    }
  }

  displayPreview();
}

//=======================================================================
// name    : getIds
// Purpose :
//=======================================================================
bool SMESHGUI_MeshPatternDlg::getIds (QList<int>& ids) const
{
  ids.clear();
  QStringList strIds = mySelEdit[Ids]->text().split(" ", QString::SkipEmptyParts );
  bool isOk;
  int val;
  for (QStringList::iterator it = strIds.begin(); it != strIds.end(); ++it) {
    val = (*it).toInt(&isOk);
    if (isOk)
      ids.append(val);
  }

  return ids.count();
}

//=======================================================================
// name    : getNode1
// Purpose :
//=======================================================================
int SMESHGUI_MeshPatternDlg::getNode (bool second) const
{
  return second ? myNode2->value() - 1 : myNode1->value() - 1;
}

//=================================================================================
// function : keyPressEvent()
// purpose  :
//=================================================================================
void SMESHGUI_MeshPatternDlg::keyPressEvent( QKeyEvent* e )
{
  QDialog::keyPressEvent( e );
  if ( e->isAccepted() )
    return;

  if ( e->key() == Qt::Key_F1 )
    {
      e->accept();
      onHelp();
    }
}