arrow_standalone.C: How to use EVE without the standard window.

// @(#)root/eve:$Id$
// Author: Matevz Tadel

// How to use EVE without the standard window.

// Type
//   gEve->GetBrowser()->MapWindow()
// to bring it up for object interaction, debugging, etc.

void arrow_standalone()
{
   TEveManager::Create(kFALSE);

   // ----------------------------------------------------------------------

   TGMainFrame* mf = new TGMainFrame(gClient->GetRoot(), 800, 400,
                                     kHorizontalFrame);
   mf->SetWindowName("Arrow Foo");

   // ----------------------------------------------------------------------

   TGCompositeFrame* evf = new TGCompositeFrame(mf, 400, 400);
   mf->AddFrame(evf, new TGLayoutHints(kLHintsNormal  |
                                       kLHintsExpandX | kLHintsExpandY));

   TGLEmbeddedViewer* ev = new TGLEmbeddedViewer(evf);
   evf->AddFrame(ev->GetFrame(),
                 new TGLayoutHints(kLHintsNormal  |
                                   kLHintsExpandX | kLHintsExpandY));

   TEveViewer* eve_v = new TEveViewer("YourViewer");
   eve_v->SetGLViewer(ev, ev->GetFrame());
   eve_v->IncDenyDestroy();
   eve_v->AddScene(gEve->GetEventScene());
   gEve->GetViewers()->AddElement(eve_v);

   // ----------------------------------------------------------------------

   // To create embedded canvas ... no menus on top.

   // TRootEmbeddedCanvas* ec =
   //    new TRootEmbeddedCanvas("EmbeddedCanvas", mf, 400, 400);
   // mf->AddFrame(ec, new TGLayoutHints(kLHintsNormal  |
   //                                    kLHintsExpandX | kLHintsExpandY));

   // --------------------------------

   // This one is tricky - must be after embedded canvas but before std canvas!
   mf->MapSubwindows();

   // --------------------------------

   // To create full canvas with menus.

   mf->SetEditable();
   TCanvas* c = new TCanvas("Foo", "Bar", 400, 400);
   mf->SetEditable(kFALSE);

   // ----------------------------------------------------------------------

   mf->Layout();
   mf->MapWindow();

   // ----------------------------------------------------------------------

   // Populate the viewer ... here we just call the arrow.C.

   TEveUtil::Macro("arrow.C");
}