TGTextViewStream.cxx

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// @(#)root/gui:$Id$
 
/*************************************************************************
 * Copyright (C) 1995-2015, Rene Brun and Fons Rademakers.               *
 * All rights reserved.                                                  *
 *                                                                       *
 * For the licensing terms see $ROOTSYS/LICENSE.                         *
 * For the list of contributors see $ROOTSYS/README/CREDITS.             *
 *************************************************************************/
 
 
/** \class TGTextViewStream
    \ingroup guiwidgets
 
A TGTextViewStream is a text viewer widget. It is a specialization
of TGTextView and std::ostream, and it uses a TGTextViewStreamBuf,
who inherits from std::streambuf, allowing to stream text directly
to the text view in a cout-like fashion
 
*/
 
 
#include "TGTextViewStream.h"
#include "TSystem.h"
 
ClassImp(TGTextViewStreamBuf);
 
////////////////////////////////////////////////////////////////////////////////
/// TGTextViewStreamBuf constructor.
 
TGTextViewStreamBuf::TGTextViewStreamBuf(TGTextView *textview) :
   fTextView(textview)
{
   fInputbuffer.reserve(32);
   setg(&fInputbuffer[0], &fInputbuffer[0], &fInputbuffer[0]);
   setp(&fInputbuffer[0], &fInputbuffer[0]);
}
 
////////////////////////////////////////////////////////////////////////////////
/// Method called to put a character into the controlled output sequence
/// without changing the current position.
 
Int_t TGTextViewStreamBuf::overflow(Int_t c)
{
   typedef std::char_traits<char> Tr;
   if (c == Tr::eof())
      return Tr::not_eof(c);
   if (c=='\n') {
      fLinebuffer.push_back('\0');
      fTextView->AddLineFast(&fLinebuffer[0]);
      fLinebuffer.clear();
      fTextView->ShowBottom();
      fTextView->Update();
      gSystem->ProcessEvents();
   } else {
      fLinebuffer.push_back(c);
   }
   return c;
}
 
////////////////////////////////////////////////////////////////////////////////
/// TGTextViewostream constructor.
 
TGTextViewostream::TGTextViewostream(const TGWindow* parent, UInt_t w,
                                     UInt_t h,Int_t id, UInt_t sboptions,
                                     Pixel_t back) :
   TGTextView(parent, w, h, id, sboptions, back), std::ostream(&fStreambuffer),
   fStreambuffer(this)
{
}
 
////////////////////////////////////////////////////////////////////////////////
/// TGTextViewostream constructor.
 
TGTextViewostream::TGTextViewostream(const TGWindow *parent, UInt_t w,
                                     UInt_t h, TGText *text, Int_t id,
                                     UInt_t sboptions, ULong_t back):
   TGTextView(parent, w, h, text, id, sboptions, back),
   std::ostream(&fStreambuffer), fStreambuffer(this)
{
}
 
////////////////////////////////////////////////////////////////////////////////
/// TGTextViewostream constructor.
 
TGTextViewostream::TGTextViewostream(const TGWindow *parent, UInt_t w,
                                     UInt_t h,const char *string, Int_t id,
                                     UInt_t sboptions, ULong_t back):
   TGTextView(parent, w, h, string, id, sboptions, back),
   std::ostream(&fStreambuffer), fStreambuffer(this)
{
}