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+// This code implementation is the intellectual property of
+// the RD44 GEANT4 collaboration.
+//
+// By copying, distributing or modifying the Program (or any work
+// based on the Program) you indicate your acceptance of this statement,
+// and all its terms.
+//
+// $Id: G4OpenInventorView.cc,v 2.10 1998/12/04 13:18:12 barrand Exp $
+// GEANT4 tag $Name: geant4-00 $
+//
+/*
+ * jck 05 Feb 1997 - Initial Implementation
+ * jck 21 Apr 1997 
+ *	Mods for SoXtHepViewer
+ *
+ */
+#ifdef G4VIS_BUILD_OI_DRIVER
+
+#ifndef WIN32  //SoXtHepViewer not ported on Windows/NT.
+#define HEP_VIEWER
+#endif
+
+#include <Inventor/Xt/SoXt.h>
+#include <Inventor/nodes/SoSelection.h>
+
+#ifdef HEP_VIEWER
+#include <HEPVis/Xt/viewers/SoXtHepViewer.h>
+#else
+#include <Inventor/Xt/viewers/SoXtExaminerViewer.h>
+#endif
+
+#include "G4OpenInventor.hh"
+#include "G4OpenInventorView.hh"
+#include "G4OpenInventorScene.hh"
+
+#include "G4VInteractorManager.hh"
+
+//
+// Global variables 
+//
+
+//static void SecondaryLoopPostAction ();
+
+void G4OpenInventorView::FinishView () {
+#ifdef HEP_VIEWER
+  ((SoXtHepViewer*)G4OIViewer)->getCurrentViewer()->viewAll();
+  ((SoXtHepViewer*)G4OIViewer)->getCurrentViewer()->saveHomePosition();
+#else
+  ((SoXtViewer*)G4OIViewer)->viewAll();
+  ((SoXtViewer*)G4OIViewer)->saveHomePosition();
+#endif
+}
+
+//
+// Exit
+//
+int quitCB(void* interactorManager) {
+  ((G4VInteractorManager*)interactorManager) -> 
+    RequireExitSecondaryLoop (OIV_EXIT_CODE);
+  return 0;
+}
+
+//static void SecondaryLoopPostAction ()
+//{
+//  Display *display = G4OIViewer->getDisplay();
+//  XSync(display, False);
+//  if(interactorManager -> GetExitSecondaryLoopCode ()==OIV_EXIT_CODE) {
+//    if (G4OIShell!=NULL) XtRealizeWidget(G4OIShell);
+//  }
+//}
+
+void G4OpenInventorView::KernelVisitDecision () {
+  
+  //
+  // Trigger a display List refresh if necessary.  This is a checklist
+  // of relevant view parameters.
+  //
+  static G4ViewParameters lastVP;  // Initialised to default.
+  G4bool need = false;
+  if (
+      (lastVP.GetDrawingStyle ()    != fVP.GetDrawingStyle ())    ||
+      (lastVP.GetRepStyle ()        != fVP.GetRepStyle ())        ||
+      (lastVP.IsCulling ()          != fVP.IsCulling ())          ||
+      (lastVP.IsCullingInvisible () != fVP.IsCullingInvisible ()) ||
+      (lastVP.IsDensityCulling ()   != fVP.IsDensityCulling ())   ||
+      (lastVP.IsCullingCovered ()   != fVP.IsCullingCovered ())   ||
+      (lastVP.IsSection ()          != fVP.IsSection ())          ||
+
+      (lastVP.IsCutaway ()          != fVP.IsCutaway ())          ||
+      (lastVP.GetCutawayPlanes ().entries () !=
+                              fVP.GetCutawayPlanes ().entries ()) ||
+
+      (lastVP.IsExplode ()          != fVP.IsExplode ())          ||
+      (lastVP.GetNoOfSides ()       != fVP.GetNoOfSides ())
+      ) {
+      need = true;;
+  }
+  if (!need && lastVP.IsDensityCulling () &&
+      (lastVP.GetVisibleDensity () != fVP.GetVisibleDensity ()))
+    need = true;
+
+  if (!need && lastVP.IsExplode () &&
+      (lastVP.GetExplodeFactor () != fVP.GetExplodeFactor ()))
+    need = true;
+      
+  if (need) {
+    lastVP = fVP;
+    NeedKernelVisit ();
+  }
+}
+
+G4OpenInventorView::G4OpenInventorView (G4OpenInventorScene& scene,
+					const G4String& name):
+G4VView (scene, scene.IncrementViewCount (), name),
+fScene (scene),
+OIvisualfound (false),
+G4OIViewer(NULL),
+G4OIShell(NULL)
+{
+  interactorManager = ((G4OpenInventor*)fScene.GetGraphicsSystem()) -> 
+    GetInteractorManager ();
+  Widget toplevel = (Widget)interactorManager->GetMainInteractor ();
+
+//interactorManager->
+//AddSecondaryLoopPostAction ((G4SecondaryLoopAction)SecondaryLoopPostAction);
+
+  OIvisualfound = true;
+
+  G4cout << "Window name: " << fName << endl;
+  // 
+  // Selection
+  //
+  G4OISelection = new SoSelection;
+  G4OISelection->policy = SoSelection::SINGLE;
+  G4OISelection->ref();
+  G4OISelection->addChild(fScene.root);
+
+  Widget    parent = (Widget)interactorManager->GetParentInteractor ();
+  SbBool    buildInsideParent;
+  char charOIName[100];
+  strncpy (charOIName, fName, 100);
+  char*     wname = charOIName;
+
+  if(parent==NULL) {  //Ask Inventor to create a viewer in its own shell.
+    parent            = toplevel;
+    buildInsideParent = FALSE;
+  } else {            //Ask Inventor to create a viewer in the given parent.
+    buildInsideParent = TRUE;
+    char* str = interactorManager->GetCreationString ();
+    if(str!=NULL) wname = str;
+  }
+  //
+  // Create and Customize the Viewer
+  //
+#ifdef HEP_VIEWER
+  G4OIViewer = new SoXtHepViewer (parent,wname,buildInsideParent);
+  ((SoXtHepViewer*)G4OIViewer)->hideTextArea();
+  ((SoXtHepViewer*)G4OIViewer)->resizeMain(550,550);
+  ((SoXtHepViewer*)G4OIViewer)->setQuitCallback(quitCB, interactorManager);
+  ((SoXtHepViewer*)G4OIViewer)->setSceneGraph(G4OISelection);
+  ((SoXtHepViewer*)G4OIViewer)->getCurrentViewer()->viewAll();
+  ((SoXtHepViewer*)G4OIViewer)->getCurrentViewer()->saveHomePosition();
+#else
+  G4OIViewer = new SoXtExaminerViewer(parent,wname,buildInsideParent);
+  G4OIViewer->setSize(SbVec2s(550,550));
+  ((SoXtViewer*)G4OIViewer)->setSceneGraph(G4OISelection);
+  ((SoXtViewer*)G4OIViewer)->viewAll();
+  ((SoXtViewer*)G4OIViewer)->saveHomePosition();
+#endif
+  G4OIViewer->setTitle(fName);
+  G4OIViewer->show();
+ 
+#if defined(WIN32) && !defined(SoFreePackage)
+  //  buildInsideParent==FALSE, isTopLevel, getShellWidget 
+  // do not work with Inventor-2.4 on Win32 !
+  // All viewers are going to be put in the same shell window !
+  if(buildInsideParent==FALSE) {
+    G4OIShell  = toplevel; 
+    interactorManager->AddShell (G4OIShell);
+    SoXt::show(G4OIShell);
+    interactorManager->FlushAndWaitExecution ();
+  }
+#else
+  if(G4OIViewer->isTopLevelShell()==TRUE) {
+    G4OIShell  = G4OIViewer -> getShellWidget();
+    if(G4OIShell!=NULL) {
+      interactorManager->AddShell (G4OIShell);
+      SoXt::show(G4OIShell);
+      interactorManager->FlushAndWaitExecution ();
+    }
+  }
+#endif
+
+  interactorManager->SetCreatedInteractor (G4OIViewer -> getWidget());
+}
+
+G4OpenInventorView::~G4OpenInventorView () {
+  if(G4OIShell!=NULL) {
+    interactorManager -> RemoveShell (G4OIShell);
+  }
+#ifdef HEP_VIEWER
+  delete ((SoXtHepViewer*)G4OIViewer);
+#else
+  delete ((SoXtExaminerViewer*)G4OIViewer);
+#endif
+  if(G4OISelection!=NULL) {
+    G4OISelection->unref();
+  }
+}
+
+void G4OpenInventorView::ClearView () {
+}
+
+void G4OpenInventorView::SetView () {
+}
+
+void G4OpenInventorView::DrawView () {
+  KernelVisitDecision ();
+  ProcessView         ();
+  FinishView          ();
+}
+
+void G4OpenInventorView::ShowView () {
+  interactorManager -> SecondaryLoop ();
+}
+
+#endif
+
+
+
+
+
+
+
+