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   view->updateEnabledDrawMode();
 185
 186   QMdiArea* aMDI = myMainWindow->mdiArea();
 187   QMdiSubWindow* aWnd = aMDI->addSubWindow(view, Qt::FramelessWindowHint);
 188     addView(aWnd);
 189   aWnd->setGeometry(0, 0, aMDI->width() / 2, aMDI->height() / 2);
 190   aWnd->show();
 191   return aWnd;
 192 }
 193
 194 XGUI_ViewWindow* XGUI_Viewer::activeViewWindow() const
 195 {
 196   return dynamic_cast<XGUI_ViewWindow*>(myActiveView->widget());
 197 }
 198
 199 void XGUI_Viewer::getSelectedObjects(AIS_ListOfInteractive& theList)
 200 {
 201   theList.Clear();
 202   for (myAISContext->InitSelected(); myAISContext->MoreSelected(); myAISContext->NextSelected())
 203     theList.Append(myAISContext->SelectedInteractive());
 204 }
 205
 206 void XGUI_Viewer::getSelectedShapes(NCollection_List<TopoDS_Shape>& theList)
 207 {
 208   Handle(AIS_InteractiveContext) ic = AISContext();
 209
 210   for (ic->InitSelected(); ic->MoreSelected(); ic->NextSelected()) {
 211     TopoDS_Shape aShape = ic->SelectedShape();
 212     if (!aShape.IsNull())
 213       theList.Append(aShape);
 214   }
 215 }
 216
 217 void XGUI_Viewer::setObjectsSelected(const AIS_ListOfInteractive& theList)
 218 {
 219   AIS_ListIteratorOfListOfInteractive aIt;
 220   for (aIt.Initialize(theList); aIt.More(); aIt.Next())
 221     myAISContext->AddOrRemoveSelected(aIt.Value(), false);
 222   myAISContext->UpdateCurrentViewer();
 223 }
 224
 225 /*! Sets hot button
 226  *\param theOper - hot operation
 227  *\param theState - adding state to state map operations.
 228  *\param theButton - adding state to button map operations.
 229  */
 230 void XGUI_Viewer::setHotButton(XGUI::InteractionStyle theInteractionStyle,
 231                                XGUI::HotOperation theOper, Qt::KeyboardModifiers theState,
 232                                Qt::MouseButtons theButton)
 233 {
 234   myStateMap[theInteractionStyle][theOper] = theState;
 235   myButtonMap[theInteractionStyle][theOper] = theButton;
 236 }
 237
 238 /*! Gets hot button for operation \a theOper.
 239  *\param theOper - input hot operation
 240  *\param theState - output state from state map operations.
 241  *\param theButton - output state from button map operations.
 242  */
 243 void XGUI_Viewer::getHotButton(XGUI::InteractionStyle theInteractionStyle,
 244                                XGUI::HotOperation theOper, Qt::KeyboardModifiers& theState,
 245                                Qt::MouseButtons& theButton)
 246 {
 247   theState = myStateMap[theInteractionStyle][theOper];
 248   theButton = myButtonMap[theInteractionStyle][theOper];
 249 }
 250
 251 /*!
 252  Changes visibility of trihedron to opposite
 253  */
 254 void XGUI_Viewer::toggleTrihedron()
 255 {
 256   setTrihedronShown(!isTrihedronVisible());
 257 }
 258
 259 /*!
 260  \return true if trihedron is visible
 261  */
 262 bool XGUI_Viewer::isTrihedronVisible() const
 263 {
 264   return !myTrihedron.IsNull() && !myAISContext.IsNull() && myAISContext->IsDisplayed(myTrihedron);
 265 }
 266
 267 /*!
 268  Sets visibility state of trihedron
 269  \param on - new state
 270  */
 271
 272 void XGUI_Viewer::setTrihedronShown(bool on)
 273 {
 274   if (myTrihedron.IsNull())
 275     return;
 276
 277   if (on) {
 278     myAISContext->Display(myTrihedron);
 279     myAISContext->Deactivate(myTrihedron);
 280   } else {
 281     myAISContext->Erase(myTrihedron);
 282   }
 283 }
 284
 285 /*!
 286  \return trihedron size
 287  */
 288 double XGUI_Viewer::trihedronSize() const
 289 {
 290   double sz = 0;
 291   if (!myTrihedron.IsNull())
 292     sz = myTrihedron->Size();
 293   return sz;
 294 }
 295
 296 /*!
 297  Changes trihedron size
 298  \param sz - new size
 299  */
 300 void XGUI_Viewer::setTrihedronSize(const double sz, bool isRelative)
 301 {
 302   if (myTrihedronSize != sz || isRelative != myIsRelative) {
 303     myTrihedronSize = sz;
 304     myIsRelative = isRelative;
 305     updateTrihedron();
 306   }
 307 }
 308
 309 /*!
 310  * Update the size of the trihedron
 311  */
 312 void XGUI_Viewer::updateTrihedron()
 313 {
 314   if (myTrihedron.IsNull())
 315     return;
 316
 317   if (myIsRelative) {
 318     double newSz, oldSz;
 319
 320     if (computeTrihedronSize(newSz, oldSz))
 321       myTrihedron->SetSize(newSz);
 322
 323   } else if (myTrihedron->Size() != myTrihedronSize) {
 324     myTrihedron->SetSize(myTrihedronSize);
 325   }
 326 }
 327
 328 /*!
 329  Get new and current trihedron size corresponding to the current model size
 330  */
 331 bool XGUI_Viewer::computeTrihedronSize(double& theNewSize, double& theSize)
 332 {
 333   theNewSize = 100;
 334   theSize = 100;
 335
 336   //SRN: BUG IPAL8996, a usage of method ActiveView without an initialization
 337   Handle(V3d_Viewer) viewer = v3dViewer();
 338   viewer->InitActiveViews();
 339   if (!viewer->MoreActiveViews())
 340     return false;
 341
 342   Handle(V3d_View) view3d = viewer->ActiveView();
 343   //SRN: END of fix
 344
 345   if (view3d.IsNull())
 346     return false;
 347
 348   double Xmin = 0, Ymin = 0, Zmin = 0, Xmax = 0, Ymax = 0, Zmax = 0;
 349   double aMaxSide;
 350
 351   view3d->View()->MinMaxValues(Xmin, Ymin, Zmin, Xmax, Ymax, Zmax);
 352
 353   if (Xmin == RealFirst() || Ymin == RealFirst() || Zmin == RealFirst() || Xmax == RealLast()
 354       || Ymax == RealLast() || Zmax == RealLast())
 355     return false;
 356
 357   aMaxSide = Xmax - Xmin;
 358   if (aMaxSide < Ymax - Ymin)
 359     aMaxSide = Ymax - Ymin;
 360   if (aMaxSide < Zmax - Zmin)
 361     aMaxSide = Zmax - Zmin;
 362
 363   // IPAL21687
 364   // The boundary box of the view may be initialized but nullified
 365   // (case of infinite objects)
 366   if (aMaxSide < Precision::Confusion())
 367     return false;
 368
 369   static float EPS = (float)5.0E-3;
 370   theSize = trihedron()->Size();
 371   //theNewSize = aMaxSide*aSizeInPercents / 100.0;
 372
 373   return fabs(theNewSize - theSize) > theSize * EPS || fabs(theNewSize - theSize) > theNewSize * EPS;
 374 }
 375
 376 void XGUI_Viewer::onViewClosed(QMdiSubWindow* theView)
 377 {
 378   if ( !theView )
 379     return;
 380
 381   emit deleteView( static_cast<XGUI_ViewWindow*>(theView->widget()) );
 382   removeView( theView );
 383
 384   // if this is last view
 385   if (myViews.size() == 0) {
 386     Standard_Integer aViewsNb = 0;
 387     for ( myV3dViewer->InitActiveViews(); myV3dViewer->MoreActiveViews(); myV3dViewer->NextActiveViews())
 388       ++aViewsNb;
 389     if ( aViewsNb < 2 ) {
 390       //clean up presentations before last view is closed
 391       myAISContext->RemoveAll(Standard_False);
 392     }
 393   }
 394 }
 395
 396 /*!Remove view window \a theView from view manager.
 397  *And close the last view, if it has \a theView.
 398 */
 399 void XGUI_Viewer::removeView( QMdiSubWindow* theView )
 400 {
 401     XGUI_ViewWindow* aWindow = static_cast<XGUI_ViewWindow*>(theView->widget());
 402
 403     aWindow->disconnect( this );
 404     myViews.removeAt( myViews.indexOf( theView ) );
 405     if ( myActiveView == theView )
 406         myActiveView = 0;
 407     if ( myViews.size() == 0 )
 408         emit lastViewClosed();
 409 }
 410
 411
 412 /*void XGUI_Viewer::onViewMapped()
 413 {
 414   setTrihedronShown(true);
 415 }*/
 416
 417
 418 void XGUI_Viewer::addView(QMdiSubWindow* theView)
 419 {
 420     XGUI_ViewWindow* aWindow = dynamic_cast<XGUI_ViewWindow*>(theView->widget());
 421
 422     connect(aWindow, SIGNAL(closed(QMdiSubWindow*)),
 423             this,    SLOT(onViewClosed(QMdiSubWindow*)));
 424
 425     connect(aWindow, SIGNAL(tryClosing(XGUI_ViewWindow*)),
 426             this,    SIGNAL(tryCloseView(XGUI_ViewWindow*)));
 427
 428     connect(aWindow, SIGNAL(mousePressed(XGUI_ViewWindow*, QMouseEvent*)),
 429             this,    SLOT(onMousePressed(XGUI_ViewWindow*, QMouseEvent*)));
 430
 431     connect(aWindow, SIGNAL(mouseDoubleClicked(XGUI_ViewWindow*, QMouseEvent*)),
 432             this,    SIGNAL(mouseDoubleClick(XGUI_ViewWindow*, QMouseEvent*)));
 433
 434     connect(aWindow, SIGNAL(mouseMoving(XGUI_ViewWindow*, QMouseEvent*)),
 435             this,    SIGNAL(mouseMove(XGUI_ViewWindow*, QMouseEvent*)));
 436
 437     connect(aWindow, SIGNAL(keyPressed(XGUI_ViewWindow*, QKeyEvent*)),
 438             this,    SIGNAL(keyPress(XGUI_ViewWindow*, QKeyEvent*)));
 439
 440     connect(aWindow, SIGNAL(keyReleased(XGUI_ViewWindow*, QKeyEvent*)),
 441             this,    SIGNAL(keyRelease(XGUI_ViewWindow*, QKeyEvent*)));
 442
 443 //    connect(aWindow, SIGNAL(contextMenuRequested( QContextMenuEvent* )),
 444 //            this,    SLOT  (onContextMenuRequested( QContextMenuEvent* )));
 445     connect(aWindow, SIGNAL(mouseMoving(XGUI_ViewWindow*, QMouseEvent*)),
 446             this, SLOT(onMouseMove(XGUI_ViewWindow*, QMouseEvent*)));
 447
 448     connect(aWindow, SIGNAL(mouseReleased(XGUI_ViewWindow*, QMouseEvent*)),
 449             this, SLOT(onMouseReleased(XGUI_ViewWindow*, QMouseEvent*)));
 450
 451     myViews.append(theView);
 452 }
 453
 454 /*!
 455     Emit activated for view \a view.
 456 */
 457 void XGUI_Viewer::onWindowActivated(QMdiSubWindow* view)
 458 {
 459   if (view && (view != myActiveView) && (!view->isMinimized())) {
 460     myActiveView = view;
 461     ((XGUI_ViewWindow*)myActiveView->widget())->windowActivated();
 462     QList<QMdiSubWindow*>::iterator aIt;
 463     for (aIt = myViews.begin(); aIt != myViews.end(); ++aIt) {
 464       if ((*aIt) != myActiveView) {
 465         ((XGUI_ViewWindow*)(*aIt)->widget())->windowDeactivated();
 466       }
 467     }
 468   }
 469 }
 470
 471
 472 void XGUI_Viewer::onWindowMinimized(QMdiSubWindow* theWnd)
 473 {
 474   if (myActiveView == theWnd) {
 475     myActiveView = 0;
 476     QList<QMdiSubWindow*>::iterator aIt;
 477     for (aIt = myViews.begin(); aIt != myViews.end(); ++aIt) {
 478       if (!(*aIt)->widget()->isMinimized()) {
 479         (*aIt)->raise();
 480         onWindowActivated(*aIt);
 481         break;
 482       }
 483     }
 484   }
 485 }
 486
 487 /*!
 488   SLOT: called on mouse button press, stores current mouse position as start point for transformations
 489 */
 490 void XGUI_Viewer::onMousePressed(XGUI_ViewWindow* theWindow, QMouseEvent* theEvent)
 491 {
 492   myStartPnt.setX(theEvent->x()); myStartPnt.setY(theEvent->y());
 493   emit mousePress(theWindow, theEvent);
 494 }
 495
 496 /*!
 497   SLOT: called on mouse move, processes hilighting
 498 */
 499 void XGUI_Viewer::onMouseMove(XGUI_ViewWindow* theWindow, QMouseEvent* theEvent)
 500 {
 501   if (!mySelectionEnabled) return;
 502
 503   myCurPnt.setX(theEvent->x()); myCurPnt.setY(theEvent->y());
 504   Handle(V3d_View) aView3d = theWindow->viewPort()->getView();
 505   if ( !aView3d.IsNull() ) {
 506     myAISContext->MoveTo(theEvent->x(), theEvent->y(), aView3d);
 507   }
 508 }
 509
 510 /*!
 511   SLOT: called on mouse button release, finishes selection
 512 */
 513 void XGUI_Viewer::onMouseReleased(XGUI_ViewWindow* theWindow, QMouseEvent* theEvent)
 514 {
 515   if (!mySelectionEnabled) return;
 516   if (theEvent->button() != Qt::LeftButton) return;
 517
 518   myEndPnt.setX(theEvent->x()); myEndPnt.setY(theEvent->y());
 519   bool aHasShift = (theEvent->modifiers() & Qt::ShiftModifier);
 520
 521   //if (!aHasShift)
 522   //  emit deselection();
 523
 524   if (myStartPnt == myEndPnt) {
 525     if (aHasShift && myMultiSelectionEnabled)
 526       myAISContext->ShiftSelect();
 527     else
 528       myAISContext->Select();
 529   } else {
 530     if (aHasShift && myMultiSelectionEnabled)
 531       myAISContext->ShiftSelect(myStartPnt.x(), myStartPnt.y(),
 532                                 myEndPnt.x(), myEndPnt.y(),
 533                                 theWindow->viewPort()->getView(), false );
 534     else
 535       myAISContext->Select(myStartPnt.x(), myStartPnt.y(),
 536                            myEndPnt.x(), myEndPnt.y(),
 537                            theWindow->viewPort()->getView(), false );
 538
 539     int Nb = myAISContext->NbSelected();
 540     if( Nb>1 && !myMultiSelectionEnabled ) {
 541       myAISContext->InitSelected();
 542       Handle( SelectMgr_EntityOwner ) anOwner = myAISContext->SelectedOwner();
 543       if( !anOwner.IsNull() ) {
 544         myAISContext->ClearSelected( Standard_False );
 545         myAISContext->AddOrRemoveSelected( anOwner, Standard_False );
 546       }
 547     }
 548
 549     myAISContext->UpdateCurrentViewer();
 550   }
 551   emit mouseRelease(theWindow, theEvent);
 552   emit selectionChanged();
 553 }
 554
 555 //******************************************************
 556 void XGUI_Viewer::setMultiSelectionEnabled(bool toEnable)
 557 {
 558   myMultiSelectionEnabled = toEnable;
 559   updateViewsDrawMode();
 560 }
 561
 562 //******************************************************
 563 void XGUI_Viewer::setSelectionEnabled(bool toEnable)
 564 {
 565   mySelectionEnabled = toEnable;
 566   updateViewsDrawMode();
 567 }
 568
 569 //******************************************************
 570 void XGUI_Viewer::updateViewsDrawMode() const
 571 {
 572   foreach(QMdiSubWindow* aWnd, myViews){
 573     XGUI_ViewWindow* aView = static_cast<XGUI_ViewWindow*>(aWnd->widget());
 574     aView->updateEnabledDrawMode();
 575   }
 576 }