// dynmenu.cpp -- manage dynamic menus
//
// Written by Frederic Bouvier, started February 2004.
//
// Copyright (C) 2004  Frederic Bouvier - fredb@users.sourceforge.net
//
// This program is free software; you can redistribute it and/or
// modify it under the terms of the GNU General Public License as
// published by the Free Software Foundation; either version 2 of the
// License, or (at your option) any later version.
//
// This program is distributed in the hope that it will be useful, but
// WITHOUT ANY WARRANTY; without even the implied warranty of
// MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
// General Public License for more details.
//
// You should have received a copy of the GNU General Public License
// along with this program; if not, write to the Free Software
// Foundation, Inc., 675 Mass Ave, Cambridge, MA 02139, USA.
//
// $Id: dynmenu.cpp,v 1.1 2004/02/14 14:17:38 fredb2 Exp $

#include "dynmenu.hpp"

#include <sstream>

FGSD_DynamicSubMenu::FGSD_DynamicSubMenu()
   :  _menu( 0 )
   ,  _first( 0 )
   ,  _last( 0 )
   ,  _next( 0 )
{
}

void FGSD_DynamicSubMenu::init( Fl_Menu_ *menu, const char *parentLabel, int position, FGSD_DynamicMenu *next )
{
   _menu = menu;
   _parentLabel = parentLabel;
   _first = position + 1;
   _last = position + 2;
   _next = next;
}

void FGSD_DynamicSubMenu::clear()
{
   while ( _last > _first )
      {
      _menu->remove( _first );
      _last -= 1;
      if ( _next )
	 _next->decrement();
      }
}

int FGSD_DynamicSubMenu::add( const char *label, int shortcut, Fl_Callback *callback, void *user_data, int flags )
{
   std::ostringstream str;
   str << _parentLabel;
   std::string text = label;
   size_t pos;
   while ( ( pos = text.find( '/' ) ) != std::string::npos )
      {
      str << text.substr( 0, pos ) << "\\/";
      text.erase( 0, pos + 1 );
      }
   if ( text.size() )
      str << text;

   int ret = _menu->add( str.str().c_str(), shortcut, callback, user_data, flags );
   _last += 1;
   if ( _next )
      _next->increment();

   return ret;
}

int FGSD_DynamicSubMenu::addNone()
{
   std::string text = _parentLabel;
   text += "None";
   int ret = _menu->add( text.c_str(), 0, 0, 0, FL_MENU_INACTIVE );
   _last += 1;
   if ( _next )
      _next->increment();

   return ret;
}

void FGSD_DynamicSubMenu::increment()
{
   _first += 1;
   _last += 1;
   if ( _next )
      _next->increment();
}

void FGSD_DynamicSubMenu::decrement()
{
   if ( _next )
      _next->decrement();
   _first -= 1;
   _last -= 1;
}


FGSD_DynamicMenuItem::FGSD_DynamicMenuItem()
   :  _menu( 0 )
   ,  _pos( 0 )
   ,  _next( 0 )
{
}

void FGSD_DynamicMenuItem::init( Fl_Menu_ *menu, const char *parentLabel, int position, FGSD_DynamicMenu *next )
{
   _menu = menu;
   _parentLabel = parentLabel;
   _pos = position;
   _next = next;
}

void FGSD_DynamicMenuItem::increment()
{
   _pos += 1;
   if ( _next )
      _next->increment();
}

void FGSD_DynamicMenuItem::decrement()
{
   if ( _next )
      _next->decrement();
   _pos -= 1;
}

void FGSD_DynamicMenuItem::label( const char *t )
{
   _label = t;
   _menu->replace( _pos, _label.c_str() );
}

void FGSD_DynamicMenuItem::activate()
{
   _menu->mode( _pos, _menu->mode( _pos ) & ~FL_MENU_INACTIVE );
}

void FGSD_DynamicMenuItem::deactivate()
{
   _menu->mode( _pos, _menu->mode( _pos ) | FL_MENU_INACTIVE );
}