//  SMESH SMESHGUI : GUI for SMESH component
//
//  Copyright (C) 2003  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.opencascade.org/SALOME/ or email : webmaster.salome@opencascade.org
//
//
//
//  File   : SMESHGUI_MultiEditDlg.cxx
//  Author : Sergey LITONIN
//  Module : SMESH

#include "SMESHGUI_MultiEditDlg.h"
#include "SMESHGUI_FilterDlg.h"
#include "SMESHGUI_Filter.h"

#include "SMESHGUI.h"
#include "SMESHGUI_Utils.h"
#include "SMESHGUI_VTKUtils.h"
#include "SMESHGUI_MeshUtils.h"

#include "SMESH_Actor.h"
#include "SMESH_TypeFilter.hxx"
#include "SMDS_Mesh.hxx"
#include "SMDS_MeshElement.hxx"

#include "SUIT_ResourceMgr.h"
#include "SUIT_Desktop.h"

#include "SalomeApp_SelectionMgr.h"
#include "SALOME_ListIO.hxx"
#include "SALOME_ListIteratorOfListIO.hxx"

#include "SVTK_Selector.h"
#include "SVTK_ViewModel.h"
#include "SVTK_ViewWindow.h"
#include "SVTK_InteractorStyle.h"

// OCCT Includes
#include <Precision.hxx>
#include <TColStd_IndexedMapOfInteger.hxx>
#include <TColStd_DataMapOfIntegerInteger.hxx>
#include <TColStd_MapIteratorOfMapOfInteger.hxx>

// VTK Includes
#include <vtkCell3D.h>
#include <vtkQuad.h>
#include <vtkTriangle.h>
#include <vtkPolygon.h>
#include <vtkConvexPointSet.h>
#include <vtkIdList.h>
#include <vtkIntArray.h>
#include <vtkCellArray.h>
#include <vtkUnsignedCharArray.h>
#include <vtkUnstructuredGrid.h>
#include <vtkDataSetMapper.h>

// QT Includes
#include <qcheckbox.h>
#include <qframe.h>
#include <qgroupbox.h>
#include <qlabel.h>
#include <qlayout.h>
#include <qlineedit.h>
#include <qlistbox.h>
#include <qpushbutton.h>
#include <qapplication.h>
#include <qhbuttongroup.h>
#include <qradiobutton.h>

// IDL Headers
#include "SALOMEconfig.h"
#include CORBA_SERVER_HEADER(SMESH_Group)

#define SPACING 5
#define MARGIN  10

/*!
 *  Class       : SMESHGUI_MultiEditDlg
 *  Description : Description : Inversion of the diagonal of a pseudo-quadrangle formed by
 *                2 neighboring triangles with 1 common edge
 */

//=======================================================================
// name    : SMESHGUI_MultiEditDlg::SMESHGUI_MultiEditDlg
// Purpose : Constructor
//=======================================================================
SMESHGUI_MultiEditDlg
::SMESHGUI_MultiEditDlg(SMESHGUI* theModule,
			const int theMode,
			const bool the3d2d,
			const char* theName):
  QDialog(SMESH::GetDesktop(theModule), 
	  theName, 
	  false, 
	  WStyle_Customize | WStyle_NormalBorder | WStyle_Title | WStyle_SysMenu | WDestructiveClose),
    mySelector(SMESH::GetViewWindow(theModule)->GetSelector()),
    mySelectionMgr(SMESH::GetSelectionMgr(theModule)),
    myViewWindow(SMESH::GetViewWindow(theModule)),
    mySMESHGUI(theModule)
{
  myFilterDlg = 0;
  myEntityType = 0;

  myFilterType = theMode;
  QVBoxLayout* aDlgLay = new QVBoxLayout(this, MARGIN, SPACING);

  QFrame* aMainFrame = createMainFrame  (this, the3d2d);
  QFrame* aBtnFrame  = createButtonFrame(this);

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

  aDlgLay->setStretchFactor(aMainFrame, 1);
  aDlgLay->setStretchFactor(aBtnFrame, 0);
  Init();
}

//=======================================================================
// name    : SMESHGUI_MultiEditDlg::createMainFrame
// Purpose : Create frame containing dialog's input fields
//=======================================================================
QFrame* SMESHGUI_MultiEditDlg::createMainFrame (QWidget* theParent, const bool the3d2d)
{
  QGroupBox* aMainGrp = new QGroupBox(1, Qt::Horizontal, theParent);
  aMainGrp->setFrameStyle(QFrame::NoFrame);
  aMainGrp->setInsideMargin(0);

  QPixmap aPix (SMESHGUI::resourceMgr()->loadPixmap("SMESH", tr("ICON_SELECT")));

  // "Selected cells" group
  mySelGrp = new QGroupBox(1, Qt::Horizontal,  aMainGrp);

  myEntityTypeGrp = 0;
  if (the3d2d) {
    myEntityTypeGrp = new QHButtonGroup(tr("SMESH_ELEMENTS_TYPE"), mySelGrp);
    (new QRadioButton(tr("SMESH_FACE"),   myEntityTypeGrp))->setChecked(true);
    (new QRadioButton(tr("SMESH_VOLUME"), myEntityTypeGrp));
    myEntityType = myEntityTypeGrp->id(myEntityTypeGrp->selected());
  }

  QFrame* aFrame = new QFrame(mySelGrp);

  myListBox = new QListBox(aFrame);
  myListBox->setSelectionMode(QListBox::Extended);
  myListBox->setSizePolicy(QSizePolicy(QSizePolicy::MinimumExpanding, QSizePolicy::MinimumExpanding));
//  myListBox->setColumnMode(QListBox::FitToHeight);
  myListBox->installEventFilter(this);

  myFilterBtn = new QPushButton(tr("FILTER")   , aFrame);
  myAddBtn    = new QPushButton(tr("ADD")      , aFrame);
  myRemoveBtn = new QPushButton(tr("REMOVE")   , aFrame);
  mySortBtn   = new QPushButton(tr("SORT_LIST"), aFrame);

  QGridLayout* aLay = new QGridLayout(aFrame, 5, 2, 0, 5);
  aLay->addMultiCellWidget(myListBox, 0, 4, 0, 0);
  aLay->addWidget(myFilterBtn, 0, 1);
  aLay->addWidget(myAddBtn, 1, 1);
  aLay->addWidget(myRemoveBtn, 2, 1);
  aLay->addWidget(mySortBtn, 3, 1);

  QSpacerItem* aSpacer = new QSpacerItem(0, 0, QSizePolicy::Minimum, QSizePolicy::Expanding);
  aLay->addItem(aSpacer, 4, 1);

  myToAllChk = new QCheckBox(tr("TO_ALL"), mySelGrp);

  // "Select from" group
  QGroupBox* aGrp = new QGroupBox(3, Qt::Horizontal, tr("SELECT_FROM"), aMainGrp);

  mySubmeshChk = new QCheckBox(tr("SMESH_SUBMESH"), aGrp);
  mySubmeshBtn = new QPushButton(aGrp);
  mySubmesh = new QLineEdit(aGrp);
  mySubmesh->setReadOnly(true);
  mySubmeshBtn->setPixmap(aPix);

  myGroupChk = new QCheckBox(tr("GROUP"), aGrp);
  myGroupBtn = new QPushButton(aGrp);
  myGroup = new QLineEdit(aGrp);
  myGroup->setReadOnly(true);
  myGroupBtn->setPixmap(aPix);

  return aMainGrp;
}

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

  myOkBtn     = new QPushButton (tr("SMESH_BUT_OK"   ), aFrame);
  myApplyBtn  = new QPushButton (tr("SMESH_BUT_APPLY"), aFrame);
  myCloseBtn  = new QPushButton (tr("SMESH_BUT_CLOSE"), aFrame);

  QSpacerItem* aSpacer = new QSpacerItem (0, 0, QSizePolicy::Expanding, QSizePolicy::Minimum);

  QHBoxLayout* aLay = new QHBoxLayout (aFrame, MARGIN, SPACING);

  aLay->addWidget(myOkBtn);
  aLay->addWidget(myApplyBtn);
  aLay->addItem(aSpacer);
  aLay->addWidget(myCloseBtn);

  return aFrame;
}

//=======================================================================
// name    : SMESHGUI_MultiEditDlg::isValid
// Purpose : Verify validity of input data
//=======================================================================
bool SMESHGUI_MultiEditDlg::isValid (const bool /*theMess*/) const
{
  return (!myMesh->_is_nil() &&
          (myListBox->count() > 0 || (myToAllChk->isChecked() && myActor)));
}

//=======================================================================
// name    : SMESHGUI_MultiEditDlg::~SMESHGUI_MultiEditDlg
// Purpose : Destructor
//=======================================================================
SMESHGUI_MultiEditDlg::~SMESHGUI_MultiEditDlg()
{
  if (myFilterDlg != 0)
  {
    myFilterDlg->reparent(0, QPoint());
    delete myFilterDlg;
  }
}

//=======================================================================
// name    : SMESHGUI_MultiEditDlg::eventFilter
// Purpose : event filter
//=======================================================================
bool SMESHGUI_MultiEditDlg::eventFilter (QObject* object, QEvent* event)
{
  if (object == myListBox && event->type() == QEvent::KeyPress) {
    QKeyEvent* ke = (QKeyEvent*)event;
    if (ke->key() == Key_Delete)
      onRemoveBtn();
  }
  return QDialog::eventFilter(object, event);
}

//=======================================================================
// name    : SMESHGUI_MultiEditDlg::Init
// Purpose : Init dialog fields, connect signals and slots, show dialog
//=======================================================================
void SMESHGUI_MultiEditDlg::Init()
{
  mySMESHGUI->SetActiveDialogBox((QDialog*)this);
  myListBox->clear();
  myIds.Clear();
  myBusy = false;
  myActor = 0;
  emit ListContensChanged();

  // main buttons
  connect(myOkBtn,    SIGNAL(clicked()), SLOT(onOk()));
  connect(myCloseBtn, SIGNAL(clicked()), SLOT(onClose()));
  connect(myApplyBtn, SIGNAL(clicked()), SLOT(onApply()));

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

  // dialog controls
  connect(myFilterBtn, SIGNAL(clicked()), SLOT(onFilterBtn()  ));
  connect(myAddBtn   , SIGNAL(clicked()), SLOT(onAddBtn()     ));
  connect(myRemoveBtn, SIGNAL(clicked()), SLOT(onRemoveBtn()  ));
  connect(mySortBtn  , SIGNAL(clicked()), SLOT(onSortListBtn()));

  connect(mySubmeshChk, SIGNAL(stateChanged(int)), SLOT(onSubmeshChk()));
  connect(myGroupChk  , SIGNAL(stateChanged(int)), SLOT(onGroupChk()  ));
  connect(myToAllChk  , SIGNAL(stateChanged(int)), SLOT(onToAllChk()  ));

  if (myEntityTypeGrp)
    connect(myEntityTypeGrp, SIGNAL(clicked(int)), SLOT(on3d2dChanged(int)));

  connect(myListBox, SIGNAL(selectionChanged()), SLOT(onListSelectionChanged()));

  onSelectionDone();

  // set selection mode
  setSelectionMode();
  updateButtons();
}

//=======================================================================
// name    : SMESHGUI_MultiEditDlg::onOk
// Purpose : SLOT called when "Ok" button pressed.
//           Assign filters VTK viewer and close dialog
//=======================================================================
void SMESHGUI_MultiEditDlg::onOk()
{
  if (onApply())
    onClose();
}

//=======================================================================
// name    : SMESHGUI_MultiEditDlg::getIds
// Purpose : Retrive identifiers from list box
//=======================================================================
SMESH::long_array_var SMESHGUI_MultiEditDlg::getIds()
{
  SMESH::long_array_var anIds = new SMESH::long_array;

  if (myToAllChk->isChecked())
  {
    myIds.Clear();
    SMESH_Actor * anActor = SMESH::FindActorByObject(myMesh);
    if (!anActor)
      anActor = myActor;
    if (anActor != 0)
    {
      TVisualObjPtr aVisualObj = anActor->GetObject();
      vtkUnstructuredGrid* aGrid = aVisualObj->GetUnstructuredGrid();
      if (aGrid != 0) {
        for (int i = 0, n = aGrid->GetNumberOfCells(); i < n; i++) {
          vtkCell* aCell = aGrid->GetCell(i);
          if (aCell != 0) {
	    vtkTriangle* aTri = vtkTriangle::SafeDownCast(aCell);
	    vtkQuad*     aQua = vtkQuad::SafeDownCast(aCell);
	    vtkPolygon*  aPG  = vtkPolygon::SafeDownCast(aCell);

	    vtkCell3D*   a3d  = vtkCell3D::SafeDownCast(aCell);
	    vtkConvexPointSet* aPH = vtkConvexPointSet::SafeDownCast(aCell);

	    if (aTri && myFilterType == SMESHGUI_TriaFilter ||
                aQua && myFilterType == SMESHGUI_QuadFilter ||
                (aTri || aQua || aPG) && myFilterType == SMESHGUI_FaceFilter ||
                (a3d || aPH) && myFilterType == SMESHGUI_VolumeFilter) {
              int anObjId = aVisualObj->GetElemObjId(i);
              myIds.Add(anObjId);
            }
          }
        }
      }
    }
  }

  anIds->length(myIds.Extent());
  TColStd_MapIteratorOfMapOfInteger anIter(myIds);
  for (int i = 0; anIter.More(); anIter.Next() )
  {
    anIds[ i++ ] = anIter.Key();
  }
  return anIds._retn();
}

//=======================================================================
// name    : SMESHGUI_MultiEditDlg::onClose
// Purpose : SLOT called when "Close" button pressed. Close dialog
//=======================================================================
void SMESHGUI_MultiEditDlg::onClose()
{
  myViewWindow->SetSelectionMode(ActorSelection);
  disconnect(mySelectionMgr, 0, this, 0);
  disconnect(mySMESHGUI, 0, this, 0);
  mySMESHGUI->ResetState();

  SMESH::RemoveFilters();
  SMESH::SetPickable();

  mySelectionMgr->clearSelected();
  mySelectionMgr->clearFilters();

  reject();
}

//=======================================================================
// name    : SMESHGUI_MultiEditDlg::onSelectionDone
// Purpose : SLOT called when selection changed
//=======================================================================
void SMESHGUI_MultiEditDlg::onSelectionDone()
{
  if (myBusy || !isEnabled()) return;
  myBusy = true;

  const SALOME_ListIO& aList = mySelector->StoredIObjects();

  int nbSel = aList.Extent();
  myListBox->clearSelection();

  if (mySubmeshChk->isChecked() || myGroupChk->isChecked()) {
    QLineEdit* aNameEdit = mySubmeshChk->isChecked() ? mySubmesh : myGroup;
    if (nbSel == 1) {
      Handle(SALOME_InteractiveObject) anIO = aList.First();
      anIO.IsNull() ? aNameEdit->clear() : aNameEdit->setText(anIO->getName());

      if (mySubmeshChk->isChecked()) {
        SMESH::SMESH_subMesh_var aSubMesh =
          SMESH::IObjectToInterface<SMESH::SMESH_subMesh>(anIO);
        if (!aSubMesh->_is_nil())
          myMesh = aSubMesh->GetFather();
      } else {
        SMESH::SMESH_GroupBase_var aGroup =
          SMESH::IObjectToInterface<SMESH::SMESH_GroupBase>(anIO);
        if (!aGroup->_is_nil())
          myMesh = aGroup->GetMesh();
      }
    } else if (nbSel > 1) {
      QString aStr = mySubmeshChk->isChecked() ?
        tr("SMESH_SUBMESH_SELECTED") : tr("SMESH_GROUP_SELECTED");
      aNameEdit->setText(aStr.arg(nbSel));
    } else {
      aNameEdit->clear();
    }
  } else if (nbSel == 1) {
    QString aListStr = "";
    Handle(SALOME_InteractiveObject) anIO = aList.First();
    int aNbItems = SMESH::GetNameOfSelectedElements(mySelector,anIO,aListStr);
    if (aNbItems > 0) {
      QStringList anElements = QStringList::split(" ", aListStr);
      QListBoxItem* anItem = 0;
      for (QStringList::iterator it = anElements.begin(); it != anElements.end(); ++it) {
        anItem = myListBox->findItem(*it, Qt::ExactMatch);
        if (anItem) myListBox->setSelected(anItem, true);
      }
    }

    myMesh = SMESH::GetMeshByIO(anIO);
  }

  if (nbSel == 1) {
    myActor = SMESH::FindActorByEntry(aList.First()->getEntry());
    if (!myActor)
      myActor = SMESH::FindActorByObject(myMesh);
    SVTK_InteractorStyle* aStyle = SMESH::GetInteractorStyle();
    Handle(VTKViewer_Filter) aFilter = aStyle->GetFilter(myFilterType);
    if (!aFilter.IsNull())
      aFilter->SetActor(myActor);
  }
  myBusy = false;

  updateButtons();
}

//=======================================================================
// name    : SMESHGUI_MultiEditDlg::onDeactivate
// Purpose : SLOT called when dialog must be deativated
//=======================================================================
void SMESHGUI_MultiEditDlg::onDeactivate()
{
  setEnabled(false);
}

//=======================================================================
// name    : SMESHGUI_MultiEditDlg::enterEvent
// Purpose : Event filter
//=======================================================================
void SMESHGUI_MultiEditDlg::enterEvent (QEvent*)
{
  if (!isEnabled()) {
    mySMESHGUI->EmitSignalDeactivateDialog();
    setEnabled(true);
    setSelectionMode();
  }
}

//=======================================================================
// name    : SMESHGUI_MultiEditDlg::closeEvent
// Purpose :
//=======================================================================
void SMESHGUI_MultiEditDlg::closeEvent (QCloseEvent*)
{
  onClose();
}
//=======================================================================
// name    : SMESHGUI_MultiEditDlg::hideEvent
// Purpose : caused by ESC key
//=======================================================================
void SMESHGUI_MultiEditDlg::hideEvent (QHideEvent*)
{
  if (!isMinimized())
    onClose();
}

//=======================================================================
// name    : SMESHGUI_MultiEditDlg::onFilterBtn
// Purpose : SLOT. Called when "Filter" button pressed.
//           Start "Selection filters" dialog
//=======================================================================
void SMESHGUI_MultiEditDlg::onFilterBtn()
{
  if (myFilterDlg == 0) {
    myFilterDlg = new SMESHGUI_FilterDlg( mySMESHGUI, entityType() ? SMESH::VOLUME : SMESH::FACE);
    connect(myFilterDlg, SIGNAL(Accepted()), SLOT(onFilterAccepted()));
  } else {
    myFilterDlg->Init(entityType() ? SMESH::VOLUME : SMESH::FACE);
  }

  myFilterDlg->SetSelection();
  myFilterDlg->SetMesh(myMesh);
  myFilterDlg->SetSourceWg(myListBox);

  myFilterDlg->show();
}

//=======================================================================
// name    : onFilterAccepted()
// Purpose : SLOT. Called when Filter dlg closed with OK button.
//            Uncheck "Select submesh" and "Select group" checkboxes
//=======================================================================
void SMESHGUI_MultiEditDlg::onFilterAccepted()
{
  myIds.Clear();
  for (int i = 0, n = myListBox->count(); i < n; i++)
    myIds.Add(myListBox->text(i).toInt());

  emit ListContensChanged();

  if (mySubmeshChk->isChecked() || myGroupChk->isChecked()) {
    mySubmeshChk->blockSignals(true);
    myGroupChk->blockSignals(true);
    mySubmeshChk->setChecked(false);
    myGroupChk->setChecked(false);
    mySubmeshChk->blockSignals(false);
    myGroupChk->blockSignals(false);
  }
  updateButtons();
}

//=======================================================================
// name    : SMESHGUI_MultiEditDlg::isIdValid
// Purpose : Verify whether Id of element satisfies to filters from viewer
//=======================================================================
bool SMESHGUI_MultiEditDlg::isIdValid (const int theId) const
{
  SVTK_InteractorStyle* aStyle = SMESH::GetInteractorStyle();
  Handle(SMESHGUI_Filter) aFilter =
    Handle(SMESHGUI_Filter)::DownCast(aStyle->GetFilter(myFilterType));

  return (!aFilter.IsNull() && aFilter->IsObjValid(theId));
}

//=======================================================================
// name    : SMESHGUI_MultiEditDlg::onAddBtn
// Purpose : SLOT. Called when "Add" button pressed.
//           Add selected in viewer entities in list box
//=======================================================================
void SMESHGUI_MultiEditDlg::onAddBtn()
{
  const SALOME_ListIO& aList = mySelector->StoredIObjects();

  int nbSelected = aList.Extent();
  if (nbSelected == 0)
    return;

  TColStd_IndexedMapOfInteger toBeAdded;

  if (!mySubmeshChk->isChecked() && !myGroupChk->isChecked()) {
    if (nbSelected == 1)
      mySelector->GetIndex(aList.First(),toBeAdded);
  } else if (mySubmeshChk->isChecked()) {
    SALOME_ListIteratorOfListIO anIter(aList);
    for (; anIter.More(); anIter.Next()) {
      SMESH::SMESH_subMesh_var aSubMesh =
        SMESH::IObjectToInterface<SMESH::SMESH_subMesh>(anIter.Value());
      if (!aSubMesh->_is_nil()) {
        if (aSubMesh->GetFather()->GetId() == myMesh->GetId()) {
          SMESH::long_array_var anIds = aSubMesh->GetElementsId();
          for (int i = 0, n = anIds->length(); i < n; i++) {
            if (isIdValid(anIds[ i ]))
              toBeAdded.Add(anIds[ i ]);
          }
        }
      }
    }
  } else if (myGroupChk->isChecked()) {
    SALOME_ListIteratorOfListIO anIter(aList);
    for (; anIter.More(); anIter.Next()) {
      SMESH::SMESH_GroupBase_var aGroup =
        SMESH::IObjectToInterface<SMESH::SMESH_GroupBase>(anIter.Value());
      if (!aGroup->_is_nil() && (aGroup->GetType() == SMESH::FACE &&
                                 entityType() == 0 || aGroup->GetType() == SMESH::VOLUME &&
                                 entityType() == 1)) {
        if (aGroup->GetMesh()->GetId() == myMesh->GetId()) {
          SMESH::long_array_var anIds = aGroup->GetListOfID();
          for (int i = 0, n = anIds->length(); i < n; i++) {
            if (isIdValid(anIds[ i ]))
              toBeAdded.Add(anIds[ i ]);
          }
        }
      }
    }
  } else {
  }

  myBusy = true;
  bool isGroupOrSubmesh = (mySubmeshChk->isChecked() || myGroupChk->isChecked());
  mySubmeshChk->setChecked(false);
  myGroupChk->setChecked(false);
  for(int i = 1; i <= toBeAdded.Extent(); i++)
    if (myIds.Add(toBeAdded(i))) {
      QListBoxItem * item = new QListBoxText(QString("%1").arg(toBeAdded(i)));
      myListBox->insertItem(item);
      myListBox->setSelected(item, true);
    }
  myBusy = false;

  emit ListContensChanged();

  if (isGroupOrSubmesh)
    onListSelectionChanged();

  updateButtons();
}

//=======================================================================
// name    : SMESHGUI_MultiEditDlg::updateButtons
// Purpose : Enable/disable buttons of dialog in accordance with current state
//=======================================================================
void SMESHGUI_MultiEditDlg::updateButtons()
{
  bool isOk = isValid(false);
  myOkBtn->setEnabled(isOk);
  myApplyBtn->setEnabled(isOk);

  bool isListBoxNonEmpty = myListBox->count() > 0;
  bool isToAll = myToAllChk->isChecked();
  myFilterBtn->setEnabled(!isToAll);
  myRemoveBtn->setEnabled(isListBoxNonEmpty && !isToAll);
  mySortBtn->setEnabled(isListBoxNonEmpty &&!isToAll);

  const SALOME_ListIO& aList = mySelector->StoredIObjects();

  if (isToAll ||
      myMesh->_is_nil() ||
      aList.Extent() != 1 ||
      (SMESH::IObjectToInterface<SMESH::SMESH_subMesh>(aList.First())->_is_nil() &&
       SMESH::IObjectToInterface<SMESH::SMESH_GroupBase>(aList.First())->_is_nil() &&
       SMESH::IObjectToInterface<SMESH::SMESH_Mesh>(aList.First())->_is_nil()))
    myAddBtn->setEnabled(false);
  else
    myAddBtn->setEnabled(true);

  mySubmeshChk->setEnabled(!isToAll);
  mySubmeshBtn->setEnabled(mySubmeshChk->isChecked());
  mySubmesh->setEnabled(mySubmeshChk->isChecked());

  myGroupChk->setEnabled(!isToAll);
  myGroupBtn->setEnabled(myGroupChk->isChecked());
  myGroup->setEnabled(myGroupChk->isChecked());

  if (!mySubmeshChk->isChecked())
    mySubmesh->clear();
  if (!myGroupChk->isChecked())
    myGroup->clear();

}

//=======================================================================
// name    : SMESHGUI_MultiEditDlg::onRemoveBtn
// Purpose : SLOT. Called when "Remove" button pressed.
//           Remove selected in list box entities
//=======================================================================
void SMESHGUI_MultiEditDlg::onRemoveBtn()
{
  myBusy = true;

  for (int i = 0, n = myListBox->count(); i < n; i++)
  {
    for (int i = myListBox->count(); i > 0; i--) {
      if (myListBox->isSelected(i - 1))
      {
        int anId = myListBox->text(i - 1).toInt();
        myIds.Remove(anId);
        myIds.Remove(anId);
	      myListBox->removeItem(i-1);
      }
    }
  }
  myBusy = false;

  emit ListContensChanged();
  updateButtons();
}

//=======================================================================
// name    : SMESHGUI_MultiEditDlg::onSortListBtn
// Purpose : SLOT. Called when "Sort list" button pressed.
//           Sort entities of list box
//=======================================================================
void SMESHGUI_MultiEditDlg::onSortListBtn()
{
  myBusy = true;

  int i, k = myListBox->count();
  if (k > 0)
  {
    QStringList aSelected;
    std::vector<int> anArray(k);
    QListBoxItem* anItem;
    for (anItem = myListBox->firstItem(), i = 0; anItem != 0; anItem = anItem->next(), i++)
    {
      anArray[ i ] = anItem->text().toInt();
      if (anItem->isSelected())
        aSelected.append(anItem->text());
    }

    std::sort(anArray.begin(), anArray.end());
    myListBox->clear();
    for (i = 0; i < k; i++)
      myListBox->insertItem(QString::number(anArray[ i ]));

    for (QStringList::iterator it = aSelected.begin(); it != aSelected.end(); ++it)
    {
      anItem = myListBox->findItem(*it, Qt::ExactMatch);
      if (anItem)
        myListBox->setSelected(anItem, true);
    }
  }
  myBusy = false;
}

//=======================================================================
// name    : SMESHGUI_MultiEditDlg::onListSelectionChanged
// Purpose : SLOT. Called when selection in list box changed.
//           Highlight in selected entities
//=======================================================================
void SMESHGUI_MultiEditDlg::onListSelectionChanged()
{
  if (myActor == 0 || myBusy)
    return;

  if (mySubmeshChk->isChecked() || myGroupChk->isChecked())
    return;

  SMESH_Actor * anActor = SMESH::FindActorByObject(myMesh);
  if (!anActor)
    anActor = myActor;
  TVisualObjPtr anObj = anActor->GetObject();

  TColStd_MapOfInteger anIndexes;
  for (QListBoxItem* anItem = myListBox->firstItem(); anItem != 0; anItem = anItem->next())
  {
    if (anItem->isSelected())
    {
      int anId = anItem->text().toInt();
      if (anObj->GetElemVTKId(anId) >= 0) // avoid exception in hilight
        anIndexes.Add(anId);
    }
  }

  mySelector->AddOrRemoveIndex(anActor->getIO(),anIndexes,false);
  myViewWindow->highlight(anActor->getIO(),true,true);
}

//=======================================================================
// name    : SMESHGUI_MultiEditDlg::onSubmeshChk
// Purpose : SLOT. Called when state of "SubMesh" check box changed.
//           Activate/deactivate selection of submeshes
//=======================================================================
void SMESHGUI_MultiEditDlg::onSubmeshChk()
{
  bool isChecked = mySubmeshChk->isChecked();
  mySubmeshBtn->setEnabled(isChecked);
  mySubmesh->setEnabled(isChecked);
  if (!isChecked)
    mySubmesh->clear();
  if (isChecked && myGroupChk->isChecked())
      myGroupChk->setChecked(false);

  setSelectionMode();
}

//=======================================================================
// name    : SMESHGUI_MultiEditDlg::onGroupChk
// Purpose : SLOT. Called when state of "Group" check box changed.
//           Activate/deactivate selection of groupes
//=======================================================================
void SMESHGUI_MultiEditDlg::onGroupChk()
{
  bool isChecked = myGroupChk->isChecked();
  myGroupBtn->setEnabled(isChecked);
  myGroup->setEnabled(isChecked);
  if (!isChecked)
    myGroup->clear();
  if (isChecked && mySubmeshChk->isChecked())
      mySubmeshChk->setChecked(false);

  setSelectionMode();
}

//=======================================================================
// name    : SMESHGUI_MultiEditDlg::onToAllChk
// Purpose : SLOT. Called when state of "Apply to all" check box changed.
//           Activate/deactivate selection
//=======================================================================
void SMESHGUI_MultiEditDlg::onToAllChk()
{
  bool isChecked = myToAllChk->isChecked();

  if (isChecked)
    myListBox->clear();

  myIds.Clear();

  emit ListContensChanged();

  updateButtons();
  setSelectionMode();
}

//=======================================================================
// name    : SMESHGUI_MultiEditDlg::setSelectionMode
// Purpose : Set selection mode
//=======================================================================
void SMESHGUI_MultiEditDlg::setSelectionMode()
{
  SMESH::RemoveFilters();

  mySelectionMgr->clearSelected();
  mySelectionMgr->clearFilters();

  if (mySubmeshChk->isChecked()) {
    myViewWindow->SetSelectionMode(ActorSelection);
    mySelectionMgr->installFilter(new SMESH_TypeFilter(SUBMESH));
  }
  else if (myGroupChk->isChecked()) {
    myViewWindow->SetSelectionMode(ActorSelection);
    mySelectionMgr->installFilter(new SMESH_TypeFilter(GROUP));
  }

  if (entityType()) {
    myViewWindow->SetSelectionMode(VolumeSelection);
    SMESH::SetFilter(new SMESHGUI_VolumesFilter());
  } else {
    myViewWindow->SetSelectionMode(FaceSelection);
    if (myFilterType == SMESHGUI_TriaFilter)
      SMESH::SetFilter(new SMESHGUI_TriangleFilter());
    else if (myFilterType == SMESHGUI_QuadFilter)
      SMESH::SetFilter(new SMESHGUI_QuadrangleFilter());
    else
      SMESH::SetFilter(new SMESHGUI_FacesFilter());
  }
}

//=======================================================================
// name    : SMESHGUI_MultiEditDlg::onApply
// Purpose : SLOT. Called when "Apply" button clicked.
//=======================================================================
bool SMESHGUI_MultiEditDlg::onApply()
{
  if (mySMESHGUI->isActiveStudyLocked())
    return false;
  if (!isValid(true))
    return false;

  SMESH::SMESH_MeshEditor_var aMeshEditor = myMesh->GetMeshEditor();
  if (aMeshEditor->_is_nil())
    return false;

  myBusy = true;

  SMESH::long_array_var anIds = getIds();

  bool aResult = process(aMeshEditor, anIds.inout());
  if (aResult) {
    if (myActor) {
      SMESH::UpdateView();
    }

    myListBox->clear();
    myIds.Clear();
    emit ListContensChanged();

    updateButtons();
  }

  myBusy = false;
  return aResult;
}

//=======================================================================
// name    : SMESHGUI_MultiEditDlg::on3d2dChanged
// Purpose :
//=======================================================================
void SMESHGUI_MultiEditDlg::on3d2dChanged (int type)
{
  if (myEntityType != type) {
    myEntityType = type;

    myListBox->clear();
    myIds.Clear();

    emit ListContensChanged();

    if (type)
      myFilterType = SMESHGUI_VolumeFilter;
    else
      myFilterType = SMESHGUI_FaceFilter;

    updateButtons();
    setSelectionMode();
  }
}

//=======================================================================
// name    : SMESHGUI_MultiEditDlg::entityType
// Purpose :
//=======================================================================
int SMESHGUI_MultiEditDlg::entityType()
{
  return myEntityType;
}

/*
 *  Class       : SMESHGUI_ChangeOrientationDlg
 *  Description : Modification of orientation of faces
 */

SMESHGUI_ChangeOrientationDlg
::SMESHGUI_ChangeOrientationDlg(SMESHGUI* theModule,
				const char* theName): 
  SMESHGUI_MultiEditDlg(theModule, SMESHGUI_FaceFilter, true, theName)
{
  setCaption(tr("CAPTION"));
}

SMESHGUI_ChangeOrientationDlg::~SMESHGUI_ChangeOrientationDlg()
{
}

bool SMESHGUI_ChangeOrientationDlg::process (SMESH::SMESH_MeshEditor_ptr theEditor,
                                             const SMESH::long_array&    theIds)
{
  return theEditor->Reorient(theIds);
}

/*!
 *  Class       : SMESHGUI_UnionOfTrianglesDlg
 *  Description : Construction of quadrangles by automatic association of triangles
 */

SMESHGUI_UnionOfTrianglesDlg
::SMESHGUI_UnionOfTrianglesDlg(SMESHGUI* theModule,
			       const char* theName):
  SMESHGUI_MultiEditDlg(theModule, SMESHGUI_TriaFilter, false, theName)
{
  setCaption(tr("CAPTION"));
}

SMESHGUI_UnionOfTrianglesDlg::~SMESHGUI_UnionOfTrianglesDlg()
{
}

bool SMESHGUI_UnionOfTrianglesDlg::process (SMESH::SMESH_MeshEditor_ptr theEditor,
                                            const SMESH::long_array&    theIds)
{
  return theEditor->TriToQuad(theIds, SMESH::NumericalFunctor::_nil(), 1.);
}

/*!
 *  Class       : SMESHGUI_CuttingOfQuadsDlg
 *  Description : Construction of quadrangles by automatic association of triangles
 */

SMESHGUI_CuttingOfQuadsDlg
::SMESHGUI_CuttingOfQuadsDlg(SMESHGUI* theModule,
			     const char* theName):
  SMESHGUI_MultiEditDlg(theModule, SMESHGUI_QuadFilter, false, theName)
{
  setCaption(tr("CAPTION"));
  myPreviewActor = 0;

  myUseDiagChk = new QCheckBox (tr("USE_DIAGONAL_2_4"), mySelGrp);
  myPreviewChk = new QCheckBox (tr("PREVIEW"), mySelGrp);

  connect(myPreviewChk, SIGNAL(stateChanged(int)),    this, SLOT(onPreviewChk()));
  connect(myUseDiagChk, SIGNAL(stateChanged(int)),    this, SLOT(onPreviewChk()));
  connect(this,         SIGNAL(ListContensChanged()), this, SLOT(onPreviewChk()));
}

SMESHGUI_CuttingOfQuadsDlg::~SMESHGUI_CuttingOfQuadsDlg()
{
}

void SMESHGUI_CuttingOfQuadsDlg::onClose()
{
  erasePreview();
  SMESHGUI_MultiEditDlg::onClose();
}

bool SMESHGUI_CuttingOfQuadsDlg::process (SMESH::SMESH_MeshEditor_ptr theEditor,
                                          const SMESH::long_array&    theIds)
{
  return theEditor->SplitQuad(theIds, !myUseDiagChk->isChecked());
}

void SMESHGUI_CuttingOfQuadsDlg::onPreviewChk()
{
  myPreviewChk->isChecked() ? displayPreview() : erasePreview();
}

void SMESHGUI_CuttingOfQuadsDlg::erasePreview()
{
  if (myPreviewActor == 0)
    return;

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

void SMESHGUI_CuttingOfQuadsDlg::displayPreview()
{
  if (myActor == 0)
    return;

  if (myPreviewActor != 0)
    erasePreview();

  // get Ids of elements
  SMESH::long_array_var anElemIds = getIds();
  if (getIds()->length() == 0)
    return;

  SMDS_Mesh* aMesh = myActor->GetObject()->GetMesh();
  if (aMesh == 0)
    return;

  bool isDiag24 = myUseDiagChk->isChecked();

  //Create grid
  vtkUnstructuredGrid* aGrid = vtkUnstructuredGrid::New();

  vtkIdType aNbCells = anElemIds->length() * 2;
  vtkIdType aCellsSize = 4 * aNbCells;
  vtkCellArray* aConnectivity = vtkCellArray::New();
  aConnectivity->Allocate(aCellsSize, 0);

  vtkPoints* aPoints = vtkPoints::New();
  aPoints->SetNumberOfPoints(anElemIds->length() * 4);

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

  vtkIdList *anIdList = vtkIdList::New();
  anIdList->SetNumberOfIds(3);

  TColStd_DataMapOfIntegerInteger anIdToVtk;

  int aNodes[ 4 ];
  int nbPoints = -1;
  for (int i = 0, n = anElemIds->length(); i < n; i++)
  {
    const SMDS_MeshElement* anElem = aMesh->FindElement(anElemIds[ i ]);
    if (anElem == 0 || anElem->NbNodes() != 4)
      continue;

    SMDS_ElemIteratorPtr anIter = anElem->nodesIterator();
    int k = 0;
    while(anIter->more())
      if (const SMDS_MeshNode* aNode = (SMDS_MeshNode*)anIter->next())
      {
        if (!anIdToVtk.IsBound(aNode->GetID()))
        {
          aPoints->SetPoint(++nbPoints, aNode->X(), aNode->Y(), aNode->Z());
          anIdToVtk.Bind(aNode->GetID(), nbPoints);
        }

        aNodes[ k++ ] = aNode->GetID();
      }

    if (k != 4)
      continue;

    if (!isDiag24)
    {
      anIdList->SetId(0, anIdToVtk(aNodes[ 0 ]));
      anIdList->SetId(1, anIdToVtk(aNodes[ 1 ]));
      anIdList->SetId(2, anIdToVtk(aNodes[ 2 ]));
      aConnectivity->InsertNextCell(anIdList);
      aCellTypesArray->InsertNextValue(VTK_TRIANGLE);

      anIdList->SetId(0, anIdToVtk(aNodes[ 2 ]));
      anIdList->SetId(1, anIdToVtk(aNodes[ 3 ]));
      anIdList->SetId(2, anIdToVtk(aNodes[ 0 ]));
      aConnectivity->InsertNextCell(anIdList);
      aCellTypesArray->InsertNextValue(VTK_TRIANGLE);
    }
    else
    {
      anIdList->SetId(0, anIdToVtk(aNodes[ 1 ]));
      anIdList->SetId(1, anIdToVtk(aNodes[ 2 ]));
      anIdList->SetId(2, anIdToVtk(aNodes[ 3 ]));
      aConnectivity->InsertNextCell(anIdList);
      aCellTypesArray->InsertNextValue(VTK_TRIANGLE);

      anIdList->SetId(0, anIdToVtk(aNodes[ 3 ]));
      anIdList->SetId(1, anIdToVtk(aNodes[ 0 ]));
      anIdList->SetId(2, anIdToVtk(aNodes[ 1 ]));
      aConnectivity->InsertNextCell(anIdList);
      aCellTypesArray->InsertNextValue(VTK_TRIANGLE);
    }
  }

  vtkIntArray* aCellLocationsArray = vtkIntArray::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);

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

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

  vtkProperty* aProp = vtkProperty::New();
  aProp->SetRepresentationToWireframe();
  aProp->SetColor(250, 0, 250);
  aProp->SetLineWidth(myActor->GetLineWidth() + 1);
  myPreviewActor->SetProperty(aProp);

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

  aProp->Delete();
  aPoints->Delete();
  aConnectivity->Delete();
  aGrid->Delete();
  aMapper->Delete();
  anIdList->Delete();
  aCellTypesArray->Delete();
  aCellLocationsArray->Delete();
}