    // @(#)root/gui:$Name:  $:$Id: TRootApplication.cxx,v 1.7 2004/08/17 14:57:46 rdm Exp $
    // Author: Fons Rademakers   15/01/98

    /*************************************************************************
     * Copyright (C) 1995-2000, Rene Brun and Fons Rademakers.               *
     * All rights reserved.                                                  *
     *                                                                       *
     * For the licensing terms see $ROOTSYS/LICENSE.                         *
     * For the list of contributors see $ROOTSYS/README/CREDITS.             *
     *************************************************************************/

    //////////////////////////////////////////////////////////////////////////
    //                                                                      //
    // TRootApplication                                                     //
    //                                                                      //
    // This class create the ROOT native GUI version of the ROOT            //
    // application environment. This in contrast to the Win32 version.      //
    // Once the native widgets work on Win32 this class can be folded into  //
    // the TApplication class (since all graphic will go via TVirtualX).    //
    //                                                                      //
    //////////////////////////////////////////////////////////////////////////

    #include "TRootApplication.h"
    #include "TSystem.h"
    #include "TString.h"
    #include "TGClient.h"
    #include "TVirtualX.h"

    ClassImp(TRootApplication)

    //______________________________________________________________________________
     TRootApplication::TRootApplication(const char *appClassName,
                                       Int_t *argc, char **argv)
    {
       fApplicationName = appClassName;
       fDisplay         = 0;

       GetOptions(argc, argv);

       if (!fDisplay)
          // Set DISPLAY based on utmp (only if DISPLAY is not yet set).
          gSystem->SetDisplay();

       fClient = new TGClient(fDisplay);

       if (fClient->IsZombie()) {
          delete fClient;
          fClient = 0;
       }
    }

    //______________________________________________________________________________
     TRootApplication::~TRootApplication()
    {
       // Delete ROOT application environment.

       delete [] fDisplay;
       delete fClient;
    }

    //______________________________________________________________________________
     Bool_t TRootApplication::IsCmdThread()
    {
       // By default (for UNIX) ROOT is a single thread application
       // For win32gdk returns kTRUE if it's called from inside of server/cmd thread

       return gVirtualX ? gVirtualX->IsCmdThread() : kTRUE;
    }

    //______________________________________________________________________________
     void TRootApplication::GetOptions(Int_t *argc, char **argv)
    {
       // Handle command line arguments. Arguments handled are removed from the
       // argument array. Currently only option "-display xserver" is considered.

       if (!argc) return;

       int i, j;
       for (i = 0; i < *argc; i++) {
          if (!strcmp(argv[i], "-display")) {
             if (argv[i+1] && strlen(argv[i+1]) && argv[i+1][0] != '-') {
                fDisplay  = StrDup(argv[i+1]);
                argv[i]   = 0;
                argv[i+1] = 0;
                i++;
             }
          }
       }

       j = 0;
       for (i = 0; i < *argc; i++) {
          if (argv[i]) {
             argv[j] = argv[i];
             j++;
          }
       }

       *argc = j;
    }