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 void XGUI_Viewer::setViewProjection(double theX, double theY, double theZ)
 251 {
 252   XGUI_ViewWindow* aWindow = dynamic_cast<XGUI_ViewWindow*>(myActiveView->widget());
 253   if (aWindow) {
 254     Handle(V3d_View) aView3d = aWindow->viewPort()->getView();
 255     if ( !aView3d.IsNull() )
 256       aView3d->SetProj(theX, theY, theZ);
 257     aWindow->viewPort()->fitAll();
 258   }
 259 }
 260
 261 /*!
 262  Changes visibility of trihedron to opposite
 263  */
 264 void XGUI_Viewer::toggleTrihedron()
 265 {
 266   setTrihedronShown(!isTrihedronVisible());
 267 }
 268
 269 /*!
 270  \return true if trihedron is visible
 271  */
 272 bool XGUI_Viewer::isTrihedronVisible() const
 273 {
 274   return !myTrihedron.IsNull() && !myAISContext.IsNull() && myAISContext->IsDisplayed(myTrihedron);
 275 }
 276
 277 /*!
 278  Sets visibility state of trihedron
 279  \param on - new state
 280  */
 281
 282 void XGUI_Viewer::setTrihedronShown(bool on)
 283 {
 284   if (myTrihedron.IsNull())
 285     return;
 286
 287   if (on) {
 288     myAISContext->Display(myTrihedron);
 289     myAISContext->Deactivate(myTrihedron);
 290   } else {
 291     myAISContext->Erase(myTrihedron);
 292   }
 293 }
 294
 295 /*!
 296  \return trihedron size
 297  */
 298 double XGUI_Viewer::trihedronSize() const
 299 {
 300   double sz = 0;
 301   if (!myTrihedron.IsNull())
 302     sz = myTrihedron->Size();
 303   return sz;
 304 }
 305
 306 /*!
 307  Changes trihedron size
 308  \param sz - new size
 309  */
 310 void XGUI_Viewer::setTrihedronSize(const double sz, bool isRelative)
 311 {
 312   if (myTrihedronSize != sz || isRelative != myIsRelative) {
 313     myTrihedronSize = sz;
 314     myIsRelative = isRelative;
 315     updateTrihedron();
 316   }
 317 }
 318
 319 /*!
 320  * Update the size of the trihedron
 321  */
 322 void XGUI_Viewer::updateTrihedron()
 323 {
 324   if (myTrihedron.IsNull())
 325     return;
 326
 327   if (myIsRelative) {
 328     double newSz, oldSz;
 329
 330     if (computeTrihedronSize(newSz, oldSz))
 331       myTrihedron->SetSize(newSz);
 332
 333   } else if (myTrihedron->Size() != myTrihedronSize) {
 334     myTrihedron->SetSize(myTrihedronSize);
 335   }
 336 }
 337
 338 /*!
 339  Get new and current trihedron size corresponding to the current model size
 340  */
 341 bool XGUI_Viewer::computeTrihedronSize(double& theNewSize, double& theSize)
 342 {
 343   theNewSize = 100;
 344   theSize = 100;
 345
 346   //SRN: BUG IPAL8996, a usage of method ActiveView without an initialization
 347   Handle(V3d_Viewer) viewer = v3dViewer();
 348   viewer->InitActiveViews();
 349   if (!viewer->MoreActiveViews())
 350     return false;
 351
 352   Handle(V3d_View) view3d = viewer->ActiveView();
 353   //SRN: END of fix
 354
 355   if (view3d.IsNull())
 356     return false;
 357
 358   double Xmin = 0, Ymin = 0, Zmin = 0, Xmax = 0, Ymax = 0, Zmax = 0;
 359   double aMaxSide;
 360
 361   view3d->View()->MinMaxValues(Xmin, Ymin, Zmin, Xmax, Ymax, Zmax);
 362
 363   if (Xmin == RealFirst() || Ymin == RealFirst() || Zmin == RealFirst() || Xmax == RealLast()
 364       || Ymax == RealLast() || Zmax == RealLast())
 365     return false;
 366
 367   aMaxSide = Xmax - Xmin;
 368   if (aMaxSide < Ymax - Ymin)
 369     aMaxSide = Ymax - Ymin;
 370   if (aMaxSide < Zmax - Zmin)
 371     aMaxSide = Zmax - Zmin;
 372
 373   // IPAL21687
 374   // The boundary box of the view may be initialized but nullified
 375   // (case of infinite objects)
 376   if (aMaxSide < Precision::Confusion())
 377     return false;
 378
 379   static float EPS = (float)5.0E-3;
 380   theSize = trihedron()->Size();
 381   //theNewSize = aMaxSide*aSizeInPercents / 100.0;
 382
 383   return fabs(theNewSize - theSize) > theSize * EPS || fabs(theNewSize - theSize) > theNewSize * EPS;
 384 }
 385
 386 void XGUI_Viewer::onViewClosed(QMdiSubWindow* theView)
 387 {
 388     if ( !theView )
 389         return;
 390
 391     emit deleteView( static_cast<XGUI_ViewWindow*>(theView->widget()) );
 392     removeView( theView );
 393
 394     // if this is last view
 395     if (myViews.size() == 0) {
 396         Standard_Integer aViewsNb = 0;
 397         for ( myV3dViewer->InitActiveViews(); myV3dViewer->MoreActiveViews(); myV3dViewer->NextActiveViews())
 398             ++aViewsNb;
 399         if ( aViewsNb < 2 ) {
 400             //clean up presentations before last view is closed
 401             myAISContext->RemoveAll(Standard_False);
 402         }
 403     }
 404 }
 405
 406 /*!Remove view window \a theView from view manager.
 407  *And close the last view, if it has \a theView.
 408 */
 409 void XGUI_Viewer::removeView( QMdiSubWindow* theView )
 410 {
 411     XGUI_ViewWindow* aWindow = static_cast<XGUI_ViewWindow*>(theView->widget());
 412
 413     aWindow->disconnect( this );
 414     myViews.removeAt( myViews.indexOf( theView ) );
 415     if ( myActiveView == theView )
 416         myActiveView = 0;
 417     if ( myViews.size() == 0 )
 418         emit lastViewClosed();
 419 }
 420
 421
 422 /*void XGUI_Viewer::onViewMapped()
 423 {
 424   setTrihedronShown(true);
 425 }*/
 426
 427
 428 void XGUI_Viewer::addView(QMdiSubWindow* theView)
 429 {
 430     XGUI_ViewWindow* aWindow = dynamic_cast<XGUI_ViewWindow*>(theView->widget());
 431
 432     connect(aWindow, SIGNAL(closed(QMdiSubWindow*)),
 433             this,    SLOT(onViewClosed(QMdiSubWindow*)));
 434
 435     connect(aWindow, SIGNAL(tryClosing(XGUI_ViewWindow*)),
 436             this,    SIGNAL(tryCloseView(XGUI_ViewWindow*)));
 437
 438     connect(aWindow, SIGNAL(mousePressed(XGUI_ViewWindow*, QMouseEvent*)),
 439             this,    SLOT(onMousePressed(XGUI_ViewWindow*, QMouseEvent*)));
 440
 441     connect(aWindow, SIGNAL(mouseReleased(XGUI_ViewWindow*, QMouseEvent*)),
 442             this,    SIGNAL(mouseRelease(XGUI_ViewWindow*, QMouseEvent*)));
 443
 444     connect(aWindow, SIGNAL(mouseDoubleClicked(XGUI_ViewWindow*, QMouseEvent*)),
 445             this,    SIGNAL(mouseDoubleClick(XGUI_ViewWindow*, QMouseEvent*)));
 446
 447     connect(aWindow, SIGNAL(mouseMoving(XGUI_ViewWindow*, QMouseEvent*)),
 448             this,    SIGNAL(mouseMove(XGUI_ViewWindow*, QMouseEvent*)));
 449
 450     connect(aWindow, SIGNAL(keyPressed(XGUI_ViewWindow*, QKeyEvent*)),
 451             this,    SIGNAL(keyPress(XGUI_ViewWindow*, QKeyEvent*)));
 452
 453     connect(aWindow, SIGNAL(keyReleased(XGUI_ViewWindow*, QKeyEvent*)),
 454             this,    SIGNAL(keyRelease(XGUI_ViewWindow*, QKeyEvent*)));
 455
 456 //    connect(aWindow, SIGNAL(contextMenuRequested( QContextMenuEvent* )),
 457 //            this,    SLOT  (onContextMenuRequested( QContextMenuEvent* )));
 458     connect(aWindow, SIGNAL(mouseMoving(XGUI_ViewWindow*, QMouseEvent*)),
 459             this, SLOT(onMouseMove(XGUI_ViewWindow*, QMouseEvent*)));
 460
 461     connect(aWindow, SIGNAL(mouseReleased(XGUI_ViewWindow*, QMouseEvent*)),
 462             this, SLOT(onMouseReleased(XGUI_ViewWindow*, QMouseEvent*)));
 463
 464     myViews.append(theView);
 465 }
 466
 467 /*!
 468     Emit activated for view \a view.
 469 */
 470 void XGUI_Viewer::onWindowActivated(QMdiSubWindow* view)
 471 {
 472   if (view && (view != myActiveView) && (!view->isMinimized())) {
 473     myActiveView = view;
 474     ((XGUI_ViewWindow*)myActiveView->widget())->windowActivated();
 475     QList<QMdiSubWindow*>::iterator aIt;
 476     for (aIt = myViews.begin(); aIt != myViews.end(); ++aIt) {
 477       if ((*aIt) != myActiveView) {
 478         ((XGUI_ViewWindow*)(*aIt)->widget())->windowDeactivated();
 479       }
 480     }
 481   }
 482 }
 483
 484
 485 void XGUI_Viewer::onWindowMinimized(QMdiSubWindow* theWnd)
 486 {
 487   if (myActiveView == theWnd) {
 488     myActiveView = 0;
 489     QList<QMdiSubWindow*>::iterator aIt;
 490     for (aIt = myViews.begin(); aIt != myViews.end(); ++aIt) {
 491       if (!(*aIt)->widget()->isMinimized()) {
 492         (*aIt)->raise();
 493         onWindowActivated(*aIt);
 494         break;
 495       }
 496     }
 497   }
 498 }
 499
 500 /*!
 501   SLOT: called on mouse button press, stores current mouse position as start point for transformations
 502 */
 503 void XGUI_Viewer::onMousePressed(XGUI_ViewWindow* theWindow, QMouseEvent* theEvent)
 504 {
 505   myStartPnt.setX(theEvent->x()); myStartPnt.setY(theEvent->y());
 506   emit mousePress(theWindow, theEvent);
 507 }
 508
 509 /*!
 510   SLOT: called on mouse move, processes hilighting
 511 */
 512 void XGUI_Viewer::onMouseMove(XGUI_ViewWindow* theWindow, QMouseEvent* theEvent)
 513 {
 514   if (!mySelectionEnabled) return;
 515
 516   myCurPnt.setX(theEvent->x()); myCurPnt.setY(theEvent->y());
 517   Handle(V3d_View) aView3d = theWindow->viewPort()->getView();
 518   if ( !aView3d.IsNull() ) {
 519     myAISContext->MoveTo(theEvent->x(), theEvent->y(), aView3d);
 520   }
 521 }
 522
 523 /*!
 524   SLOT: called on mouse button release, finishes selection
 525 */
 526 void XGUI_Viewer::onMouseReleased(XGUI_ViewWindow* theWindow, QMouseEvent* theEvent)
 527 {
 528   if (!mySelectionEnabled) return;
 529   if (theEvent->button() != Qt::LeftButton) return;
 530
 531   myEndPnt.setX(theEvent->x()); myEndPnt.setY(theEvent->y());
 532   bool aHasShift = (theEvent->modifiers() & Qt::ShiftModifier);
 533
 534   //if (!aHasShift)
 535   //  emit deselection();
 536
 537   if (myStartPnt == myEndPnt) {
 538     if (aHasShift && myMultiSelectionEnabled)
 539       myAISContext->ShiftSelect();
 540     else
 541       myAISContext->Select();
 542   } else {
 543     if (aHasShift && myMultiSelectionEnabled)
 544       myAISContext->ShiftSelect(myStartPnt.x(), myStartPnt.y(),
 545                                 myEndPnt.x(), myEndPnt.y(),
 546                                 theWindow->viewPort()->getView(), false );
 547     else
 548       myAISContext->Select(myStartPnt.x(), myStartPnt.y(),
 549                            myEndPnt.x(), myEndPnt.y(),
 550                            theWindow->viewPort()->getView(), false );
 551
 552     int Nb = myAISContext->NbSelected();
 553     if( Nb>1 && !myMultiSelectionEnabled ) {
 554       myAISContext->InitSelected();
 555       Handle( SelectMgr_EntityOwner ) anOwner = myAISContext->SelectedOwner();
 556       if( !anOwner.IsNull() ) {
 557         myAISContext->ClearSelected( Standard_False );
 558         myAISContext->AddOrRemoveSelected( anOwner, Standard_False );
 559       }
 560     }
 561
 562     myAISContext->UpdateCurrentViewer();
 563   }
 564   emit selectionChanged();
 565 }