src/XGUI/XGUI_Viewer.cpp

   1 #include "XGUI_Viewer.h"
   2 #include "XGUI_MainWindow.h"
   3 #include "XGUI_ViewWindow.h"
   4 #include "XGUI_ViewPort.h"
   5
   6 #include <QMdiArea>
   7 #include <QMdiSubWindow>
   8 #include <QApplication>
   9
  10 #include <V3d_View.hxx>
  11
  12 #include <Aspect_DisplayConnection.hxx>
  13 #include <Graphic3d.hxx>
  14 #include <Graphic3d_GraphicDriver.hxx>
  15 #include <Geom_Axis2Placement.hxx>
  16 #include <AIS_Drawer.hxx>
  17 #include <Prs3d_DatumAspect.hxx>
  18 #include <Prs3d_LineAspect.hxx>
  19 #include <V3d_View.hxx>
  20 #include <Visual3d_View.hxx>
  21 #include <AIS_ListOfInteractive.hxx>
  22 #include <AIS_ListIteratorOfListOfInteractive.hxx>
  23 #include <AIS_Shape.hxx>
  24
  25 #include <QMouseEvent>
  26
  27 #ifdef WIN32
  28 #include <WNT_Window.hxx>
  29 #else
  30 #include <Xw_Window.hxx>
  31 #endif
  32
  33 XGUI_Viewer::InteractionStyle2StatesMap XGUI_Viewer::myStateMap;
  34 XGUI_Viewer::InteractionStyle2ButtonsMap XGUI_Viewer::myButtonMap;
  35 static bool isInitialized = false;
  36
  37 /*!
  38  Creates viewer 3d [ static ]
  39  */
  40 Handle(V3d_Viewer) CreateViewer(const Standard_ExtString name, const Standard_CString displayName,
  41                                 const Standard_CString domain, const Standard_Real viewSize,
  42                                 const V3d_TypeOfOrientation viewProjection,
  43                                 const Standard_Boolean computedMode,
  44                                 const Standard_Boolean defaultComputedMode)
  45 {
  46   static Handle(Graphic3d_GraphicDriver) aGraphicDriver;
  47   if (aGraphicDriver.IsNull()) {
  48     Handle(Aspect_DisplayConnection) aDisplayConnection;
  49 #ifndef WIN32
  50     aDisplayConnection = new Aspect_DisplayConnection( displayName );
  51 #else
  52     aDisplayConnection = new Aspect_DisplayConnection();
  53 #endif
  54     aGraphicDriver = Graphic3d::InitGraphicDriver(aDisplayConnection);
  55   }
  56
  57   return new V3d_Viewer(aGraphicDriver, name, domain, viewSize, viewProjection, Quantity_NOC_GRAY30,
  58                         V3d_ZBUFFER, V3d_GOURAUD, V3d_WAIT, computedMode, defaultComputedMode,
  59                         V3d_TEX_NONE);
  60 }
  61
  62 // VSR: Uncomment below line to allow texture background support in OCC viewer
  63 #define OCC_ENABLE_TEXTURED_BACKGROUND
  64
  65 /*!
  66  Get data for supported background modes: gradient types, identifiers and supported image formats
  67  */
  68 QString XGUI_Viewer::backgroundData(QStringList& gradList, QIntList& idList, QIntList& txtList)
  69 {
  70   gradList << tr("Horizontal gradient") << tr("Vertical gradient")
  71       << tr("First diagonal gradient") << tr("Second diagonal gradient")
  72       << tr("First corner gradient") << tr("Second corner gradient")
  73       << tr("Third corner gradient") << tr("Fourth corner gradient");
  74   idList << XGUI::HorizontalGradient << XGUI::VerticalGradient << XGUI::Diagonal1Gradient
  75       << XGUI::Diagonal2Gradient << XGUI::Corner1Gradient << XGUI::Corner2Gradient
  76       << XGUI::Corner3Gradient << XGUI::Corner4Gradient;
  77 #ifdef OCC_ENABLE_TEXTURED_BACKGROUND
  78   txtList << XGUI::CenterTexture << XGUI::TileTexture << XGUI::StretchTexture;
  79 #endif
  80   return tr("Image files (*.bmp *.gif *.pix *.xwd *.rgb *.rs)");
  81 }
  82
  83 XGUI_Viewer::XGUI_Viewer(XGUI_MainWindow* theParent, bool DisplayTrihedron)
  84     : QObject(theParent),
  85     myMainWindow(theParent),
  86     myPreselectionEnabled(true),
  87     mySelectionEnabled(true),
  88     myMultiSelectionEnabled(true),
  89     myIsRelative(true),
  90     myInteractionStyle(XGUI::STANDARD),
  91     myTrihedronSize(100),
  92     myActiveView(0)
  93 {
  94   if (!isInitialized) {
  95     isInitialized = true;
  96
  97     // standard interaction style
  98     XGUI_Viewer::myStateMap[XGUI::STANDARD][XGUI::ZOOM] = Qt::ControlModifier;
  99     XGUI_Viewer::myButtonMap[XGUI::STANDARD][XGUI::ZOOM] = Qt::LeftButton;
 100
 101     XGUI_Viewer::myStateMap[XGUI::STANDARD][XGUI::PAN] = Qt::ControlModifier;
 102     XGUI_Viewer::myButtonMap[XGUI::STANDARD][XGUI::PAN] = Qt::MidButton;
 103
 104     XGUI_Viewer::myStateMap[XGUI::STANDARD][XGUI::ROTATE] = Qt::ControlModifier;
 105     XGUI_Viewer::myButtonMap[XGUI::STANDARD][XGUI::ROTATE] = Qt::RightButton;
 106
 107     XGUI_Viewer::myStateMap[XGUI::STANDARD][XGUI::FIT_AREA] = Qt::ControlModifier;
 108     XGUI_Viewer::myButtonMap[XGUI::STANDARD][XGUI::FIT_AREA] = Qt::RightButton;
 109
 110     // "key free" interaction style
 111     XGUI_Viewer::myStateMap[XGUI::KEY_FREE][XGUI::ZOOM] = Qt::NoModifier;
 112     XGUI_Viewer::myButtonMap[XGUI::KEY_FREE][XGUI::ZOOM] = Qt::RightButton;
 113
 114     XGUI_Viewer::myStateMap[XGUI::KEY_FREE][XGUI::PAN] = Qt::NoModifier;
 115     XGUI_Viewer::myButtonMap[XGUI::KEY_FREE][XGUI::PAN] = Qt::MidButton;
 116
 117     XGUI_Viewer::myStateMap[XGUI::KEY_FREE][XGUI::ROTATE] = Qt::NoModifier;
 118     XGUI_Viewer::myButtonMap[XGUI::KEY_FREE][XGUI::ROTATE] = Qt::LeftButton;
 119
 120     XGUI_Viewer::myStateMap[XGUI::KEY_FREE][XGUI::FIT_AREA] = Qt::NoModifier; // unused
 121     XGUI_Viewer::myButtonMap[XGUI::KEY_FREE][XGUI::FIT_AREA] = Qt::NoButton; // unused
 122   }
 123
 124   // init CasCade viewers
 125   myV3dViewer = CreateViewer(TCollection_ExtendedString("Viewer3d").ToExtString(), "", "", 1000.0,
 126                              V3d_XposYnegZpos, Standard_True, Standard_True);
 127   myV3dViewer->SetDefaultLights();
 128
 129   // init selector
 130   myAISContext = new AIS_InteractiveContext(myV3dViewer);
 131   myAISContext->SelectionColor(Quantity_NOC_WHITE);
 132
 133   // display isoline on planar faces (box for ex.)
 134   myAISContext->IsoOnPlane(true);
 135
 136   if (DisplayTrihedron) {
 137     Handle(Geom_Axis2Placement) anAxis = new Geom_Axis2Placement(gp::XOY());
 138     myTrihedron = new AIS_Trihedron(anAxis);
 139     myTrihedron->SetInfiniteState( Standard_True);
 140
 141     Quantity_Color Col(193 / 255., 205 / 255., 193 / 255., Quantity_TOC_RGB);
 142     myTrihedron->SetArrowColor(Col.Name());
 143     myTrihedron->SetSize(myTrihedronSize);
 144     Handle(AIS_Drawer) drawer = myTrihedron->Attributes();
 145     if (drawer->HasDatumAspect()) {
 146       Handle(Prs3d_DatumAspect) daspect = drawer->DatumAspect();
 147       daspect->FirstAxisAspect()->SetColor(Quantity_Color(1.0, 0.0, 0.0, Quantity_TOC_RGB));
 148       daspect->SecondAxisAspect()->SetColor(Quantity_Color(0.0, 1.0, 0.0, Quantity_TOC_RGB));
 149       daspect->ThirdAxisAspect()->SetColor(Quantity_Color(0.0, 0.0, 1.0, Quantity_TOC_RGB));
 150     }
 151   }
 152   // set zooming style to standard
 153   //myZoomingStyle = 0;
 154
 155   QMdiArea* aMDI = myMainWindow->mdiArea();
 156   connect(aMDI, SIGNAL(subWindowActivated(QMdiSubWindow*)), this, SLOT(onWindowActivated(QMdiSubWindow*)));
 157
 158 }
 159
 160 XGUI_Viewer::~XGUI_Viewer(void)
 161 {
 162   myAISContext.Nullify();
 163   myV3dViewer.Nullify();
 164 }
 165
 166 QMdiSubWindow* XGUI_Viewer::createView(V3d_TypeOfView theType)
 167 {
 168   // create view frame
 169   XGUI_ViewWindow* view = new XGUI_ViewWindow(this, theType);
 170   // get main view window (created by view frame)
 171   //OCCViewer_ViewWindow* vw = view->getView(OCCViewer_ViewFrame::MAIN_VIEW);
 172   // initialize main view window
 173   //initView( vw );
 174   // set default background for view window
 175   //vw->setBackground( background(0) ); // 0 means MAIN_VIEW (other views are not yet created here)
 176   //// connect signal from viewport
 177     //connect(view->viewPort(), SIGNAL(vpClosed()), this, SLOT(onViewClosed()));
 178     //connect(view->viewPort(), SIGNAL(vpMapped()), this, SLOT(onViewMapped()));
 179     if (myViews.size() == 0)
 180         setTrihedronShown(true);
 181
 182     view->setBackground(XGUI_ViewBackground(XGUI::VerticalGradient, Qt::white, QColor(Qt::blue).lighter()));
 183   //view->setBackground(XGUI_ViewBackground(Qt::black));
 184
 185   QMdiArea* aMDI = myMainWindow->mdiArea();
 186   QMdiSubWindow* aWnd = aMDI->addSubWindow(view, Qt::FramelessWindowHint);
 187     addView(aWnd);
 188   aWnd->setGeometry(0, 0, aMDI->width() / 2, aMDI->height() / 2);
 189   aWnd->show();
 190   return aWnd;
 191 }
 192
 193 XGUI_ViewWindow* XGUI_Viewer::activeViewWindow() const
 194 {
 195   return dynamic_cast<XGUI_ViewWindow*>(myActiveView->widget());
 196 }
 197
 198 void XGUI_Viewer::getSelectedObjects(AIS_ListOfInteractive& theList)
 199 {
 200   theList.Clear();
 201   for (myAISContext->InitSelected(); myAISContext->MoreSelected(); myAISContext->NextSelected())
 202     theList.Append(myAISContext->SelectedInteractive());
 203 }
 204
 205 void XGUI_Viewer::getSelectedShapes(NCollection_List<TopoDS_Shape>& theList)
 206 {
 207   Handle(AIS_InteractiveContext) ic = AISContext();
 208
 209   for (ic->InitSelected(); ic->MoreSelected(); ic->NextSelected()) {
 210     TopoDS_Shape aShape = ic->SelectedShape();
 211     if (!aShape.IsNull())
 212       theList.Append(aShape);
 213   }
 214 }
 215
 216 void XGUI_Viewer::setObjectsSelected(const AIS_ListOfInteractive& theList)
 217 {
 218   AIS_ListIteratorOfListOfInteractive aIt;
 219   for (aIt.Initialize(theList); aIt.More(); aIt.Next())
 220     myAISContext->AddOrRemoveSelected(aIt.Value(), false);
 221   myAISContext->UpdateCurrentViewer();
 222 }
 223
 224 /*! Sets hot button
 225  *\param theOper - hot operation
 226  *\param theState - adding state to state map operations.
 227  *\param theButton - adding state to button map operations.
 228  */
 229 void XGUI_Viewer::setHotButton(XGUI::InteractionStyle theInteractionStyle,
 230                                XGUI::HotOperation theOper, Qt::KeyboardModifiers theState,
 231                                Qt::MouseButtons theButton)
 232 {
 233   myStateMap[theInteractionStyle][theOper] = theState;
 234   myButtonMap[theInteractionStyle][theOper] = theButton;
 235 }
 236
 237 /*! Gets hot button for operation \a theOper.
 238  *\param theOper - input hot operation
 239  *\param theState - output state from state map operations.
 240  *\param theButton - output state from button map operations.
 241  */
 242 void XGUI_Viewer::getHotButton(XGUI::InteractionStyle theInteractionStyle,
 243                                XGUI::HotOperation theOper, Qt::KeyboardModifiers& theState,
 244                                Qt::MouseButtons& theButton)
 245 {
 246   theState = myStateMap[theInteractionStyle][theOper];
 247   theButton = myButtonMap[theInteractionStyle][theOper];
 248 }
 249
 250 /*!
 251  Changes visibility of trihedron to opposite
 252  */
 253 void XGUI_Viewer::toggleTrihedron()
 254 {
 255   setTrihedronShown(!isTrihedronVisible());
 256 }
 257
 258 /*!
 259  \return true if trihedron is visible
 260  */
 261 bool XGUI_Viewer::isTrihedronVisible() const
 262 {
 263   return !myTrihedron.IsNull() && !myAISContext.IsNull() && myAISContext->IsDisplayed(myTrihedron);
 264 }
 265
 266 /*!
 267  Sets visibility state of trihedron
 268  \param on - new state
 269  */
 270
 271 void XGUI_Viewer::setTrihedronShown(bool on)
 272 {
 273   if (myTrihedron.IsNull())
 274     return;
 275
 276   if (on) {
 277     myAISContext->Display(myTrihedron);
 278     myAISContext->Deactivate(myTrihedron);
 279   } else {
 280     myAISContext->Erase(myTrihedron);
 281   }
 282 }
 283
 284 /*!
 285  \return trihedron size
 286  */
 287 double XGUI_Viewer::trihedronSize() const
 288 {
 289   double sz = 0;
 290   if (!myTrihedron.IsNull())
 291     sz = myTrihedron->Size();
 292   return sz;
 293 }
 294
 295 /*!
 296  Changes trihedron size
 297  \param sz - new size
 298  */
 299 void XGUI_Viewer::setTrihedronSize(const double sz, bool isRelative)
 300 {
 301   if (myTrihedronSize != sz || isRelative != myIsRelative) {
 302     myTrihedronSize = sz;
 303     myIsRelative = isRelative;
 304     updateTrihedron();
 305   }
 306 }
 307
 308 /*!
 309  * Update the size of the trihedron
 310  */
 311 void XGUI_Viewer::updateTrihedron()
 312 {
 313   if (myTrihedron.IsNull())
 314     return;
 315
 316   if (myIsRelative) {
 317     double newSz, oldSz;
 318
 319     if (computeTrihedronSize(newSz, oldSz))
 320       myTrihedron->SetSize(newSz);
 321
 322   } else if (myTrihedron->Size() != myTrihedronSize) {
 323     myTrihedron->SetSize(myTrihedronSize);
 324   }
 325 }
 326
 327 /*!
 328  Get new and current trihedron size corresponding to the current model size
 329  */
 330 bool XGUI_Viewer::computeTrihedronSize(double& theNewSize, double& theSize)
 331 {
 332   theNewSize = 100;
 333   theSize = 100;
 334
 335   //SRN: BUG IPAL8996, a usage of method ActiveView without an initialization
 336   Handle(V3d_Viewer) viewer = v3dViewer();
 337   viewer->InitActiveViews();
 338   if (!viewer->MoreActiveViews())
 339     return false;
 340
 341   Handle(V3d_View) view3d = viewer->ActiveView();
 342   //SRN: END of fix
 343
 344   if (view3d.IsNull())
 345     return false;
 346
 347   double Xmin = 0, Ymin = 0, Zmin = 0, Xmax = 0, Ymax = 0, Zmax = 0;
 348   double aMaxSide;
 349
 350   view3d->View()->MinMaxValues(Xmin, Ymin, Zmin, Xmax, Ymax, Zmax);
 351
 352   if (Xmin == RealFirst() || Ymin == RealFirst() || Zmin == RealFirst() || Xmax == RealLast()
 353       || Ymax == RealLast() || Zmax == RealLast())
 354     return false;
 355
 356   aMaxSide = Xmax - Xmin;
 357   if (aMaxSide < Ymax - Ymin)
 358     aMaxSide = Ymax - Ymin;
 359   if (aMaxSide < Zmax - Zmin)
 360     aMaxSide = Zmax - Zmin;
 361
 362   // IPAL21687
 363   // The boundary box of the view may be initialized but nullified
 364   // (case of infinite objects)
 365   if (aMaxSide < Precision::Confusion())
 366     return false;
 367
 368   static float EPS = (float)5.0E-3;
 369   theSize = trihedron()->Size();
 370   //theNewSize = aMaxSide*aSizeInPercents / 100.0;
 371
 372   return fabs(theNewSize - theSize) > theSize * EPS || fabs(theNewSize - theSize) > theNewSize * EPS;
 373 }
 374
 375 void XGUI_Viewer::onViewClosed(QMdiSubWindow* theView)
 376 {
 377     if ( !theView )
 378         return;
 379
 380     emit deleteView( static_cast<XGUI_ViewWindow*>(theView->widget()) );
 381     removeView( theView );
 382
 383     // if this is last view
 384     if (myViews.size() == 0) {
 385         Standard_Integer aViewsNb = 0;
 386         for ( myV3dViewer->InitActiveViews(); myV3dViewer->MoreActiveViews(); myV3dViewer->NextActiveViews())
 387             ++aViewsNb;
 388         if ( aViewsNb < 2 ) {
 389             //clean up presentations before last view is closed
 390             myAISContext->RemoveAll(Standard_False);
 391         }
 392     }
 393 }
 394
 395 /*!Remove view window \a theView from view manager.
 396  *And close the last view, if it has \a theView.
 397 */
 398 void XGUI_Viewer::removeView( QMdiSubWindow* theView )
 399 {
 400     XGUI_ViewWindow* aWindow = static_cast<XGUI_ViewWindow*>(theView->widget());
 401
 402     aWindow->disconnect( this );
 403     myViews.removeAt( myViews.indexOf( theView ) );
 404     if ( myActiveView == theView )
 405         myActiveView = 0;
 406     if ( myViews.size() == 0 )
 407         emit lastViewClosed();
 408 }
 409
 410
 411 /*void XGUI_Viewer::onViewMapped()
 412 {
 413   setTrihedronShown(true);
 414 }*/
 415
 416
 417 void XGUI_Viewer::addView(QMdiSubWindow* theView)
 418 {
 419     XGUI_ViewWindow* aWindow = dynamic_cast<XGUI_ViewWindow*>(theView->widget());
 420
 421     connect(aWindow, SIGNAL(closed(QMdiSubWindow*)),
 422             this,    SLOT(onViewClosed(QMdiSubWindow*)));
 423
 424     connect(aWindow, SIGNAL(tryClosing(XGUI_ViewWindow*)),
 425             this,    SIGNAL(tryCloseView(XGUI_ViewWindow*)));
 426
 427     connect(aWindow, SIGNAL(mousePressed(XGUI_ViewWindow*, QMouseEvent*)),
 428             this,    SLOT(onMousePressed(XGUI_ViewWindow*, QMouseEvent*)));
 429
 430     connect(aWindow, SIGNAL(mouseReleased(XGUI_ViewWindow*, QMouseEvent*)),
 431             this,    SIGNAL(mouseRelease(XGUI_ViewWindow*, QMouseEvent*)));
 432
 433     connect(aWindow, SIGNAL(mouseDoubleClicked(XGUI_ViewWindow*, QMouseEvent*)),
 434             this,    SIGNAL(mouseDoubleClick(XGUI_ViewWindow*, QMouseEvent*)));
 435
 436     connect(aWindow, SIGNAL(mouseMoving(XGUI_ViewWindow*, QMouseEvent*)),
 437             this,    SIGNAL(mouseMove(XGUI_ViewWindow*, QMouseEvent*)));
 438
 439     connect(aWindow, SIGNAL(keyPressed(XGUI_ViewWindow*, QKeyEvent*)),
 440             this,    SIGNAL(keyPress(XGUI_ViewWindow*, QKeyEvent*)));
 441
 442     connect(aWindow, SIGNAL(keyReleased(XGUI_ViewWindow*, QKeyEvent*)),
 443             this,    SIGNAL(keyRelease(XGUI_ViewWindow*, QKeyEvent*)));
 444
 445 //    connect(aWindow, SIGNAL(contextMenuRequested( QContextMenuEvent* )),
 446 //            this,    SLOT  (onContextMenuRequested( QContextMenuEvent* )));
 447     connect(aWindow, SIGNAL(mouseMoving(XGUI_ViewWindow*, QMouseEvent*)),
 448             this, SLOT(onMouseMove(XGUI_ViewWindow*, QMouseEvent*)));
 449
 450     connect(aWindow, SIGNAL(mouseReleased(XGUI_ViewWindow*, QMouseEvent*)),
 451             this, SLOT(onMouseReleased(XGUI_ViewWindow*, QMouseEvent*)));
 452
 453     myViews.append(theView);
 454 }
 455
 456 /*!
 457     Emit activated for view \a view.
 458 */
 459 void XGUI_Viewer::onWindowActivated(QMdiSubWindow* view)
 460 {
 461   if (view && (view != myActiveView) && (!view->isMinimized())) {
 462     myActiveView = view;
 463     ((XGUI_ViewWindow*)myActiveView->widget())->windowActivated();
 464     QList<QMdiSubWindow*>::iterator aIt;
 465     for (aIt = myViews.begin(); aIt != myViews.end(); ++aIt) {
 466       if ((*aIt) != myActiveView) {
 467         ((XGUI_ViewWindow*)(*aIt)->widget())->windowDeactivated();
 468       }
 469     }
 470   }
 471 }
 472
 473
 474 void XGUI_Viewer::onWindowMinimized(QMdiSubWindow* theWnd)
 475 {
 476   if (myActiveView == theWnd) {
 477     myActiveView = 0;
 478     QList<QMdiSubWindow*>::iterator aIt;
 479     for (aIt = myViews.begin(); aIt != myViews.end(); ++aIt) {
 480       if (!(*aIt)->widget()->isMinimized()) {
 481         (*aIt)->raise();
 482         onWindowActivated(*aIt);
 483         break;
 484       }
 485     }
 486   }
 487 }
 488
 489 /*!
 490   SLOT: called on mouse button press, stores current mouse position as start point for transformations
 491 */
 492 void XGUI_Viewer::onMousePressed(XGUI_ViewWindow* theWindow, QMouseEvent* theEvent)
 493 {
 494   myStartPnt.setX(theEvent->x()); myStartPnt.setY(theEvent->y());
 495   emit mousePress(theWindow, theEvent);
 496 }
 497
 498 /*!
 499   SLOT: called on mouse move, processes hilighting
 500 */
 501 void XGUI_Viewer::onMouseMove(XGUI_ViewWindow* theWindow, QMouseEvent* theEvent)
 502 {
 503   if (!mySelectionEnabled) return;
 504
 505   myCurPnt.setX(theEvent->x()); myCurPnt.setY(theEvent->y());
 506   Handle(V3d_View) aView3d = theWindow->viewPort()->getView();
 507   if ( !aView3d.IsNull() ) {
 508     myAISContext->MoveTo(theEvent->x(), theEvent->y(), aView3d);
 509   }
 510 }
 511
 512 /*!
 513   SLOT: called on mouse button release, finishes selection
 514 */
 515 void XGUI_Viewer::onMouseReleased(XGUI_ViewWindow* theWindow, QMouseEvent* theEvent)
 516 {
 517   if (!mySelectionEnabled) return;
 518   if (theEvent->button() != Qt::LeftButton) return;
 519
 520   myEndPnt.setX(theEvent->x()); myEndPnt.setY(theEvent->y());
 521   bool aHasShift = (theEvent->modifiers() & Qt::ShiftModifier);
 522
 523   //if (!aHasShift)
 524   //  emit deselection();
 525
 526   if (myStartPnt == myEndPnt) {
 527     if (aHasShift && myMultiSelectionEnabled)
 528       myAISContext->ShiftSelect();
 529     else
 530       myAISContext->Select();
 531   } else {
 532     if (aHasShift && myMultiSelectionEnabled)
 533       myAISContext->ShiftSelect(myStartPnt.x(), myStartPnt.y(),
 534                                 myEndPnt.x(), myEndPnt.y(),
 535                                 theWindow->viewPort()->getView(), false );
 536     else
 537       myAISContext->Select(myStartPnt.x(), myStartPnt.y(),
 538                            myEndPnt.x(), myEndPnt.y(),
 539                            theWindow->viewPort()->getView(), false );
 540
 541     int Nb = myAISContext->NbSelected();
 542     if( Nb>1 && !myMultiSelectionEnabled ) {
 543       myAISContext->InitSelected();
 544       Handle( SelectMgr_EntityOwner ) anOwner = myAISContext->SelectedOwner();
 545       if( !anOwner.IsNull() ) {
 546         myAISContext->ClearSelected( Standard_False );
 547         myAISContext->AddOrRemoveSelected( anOwner, Standard_False );
 548       }
 549     }
 550
 551     myAISContext->UpdateCurrentViewer();
 552   }
 553   emit selectionChanged();
 554 }