base_tweener.cpp

/*
  CLAW - a C++ Library Absolutely Wonderful
 
  CLAW is a free library without any particular aim but being useful to
  anyone.
 
  Copyright (C) 2005-2011 Julien Jorge
 
  This library is free software; you can redistribute it and/or
  modify it under the terms of the GNU Lesser General Public
  License as published by the Free Software Foundation; either
  version 2.1 of the License, or (at your option) any later version.
 
  This library 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
  Lesser General Public License for more details.
 
  You should have received a copy of the GNU Lesser General Public
  License along with this library; if not, write to the Free Software
  Foundation, Inc., 51 Franklin St, Fifth Floor, Boston, MA  02110-1301  USA
  contact: julien.jorge@stuff-o-matic.com
*/
#include <claw/tween/base_tweener.hpp>
 
#include <claw/assert.hpp>

claw::tween::base_tweener::~base_tweener()
{}

claw::tween::base_tweener* claw::tween::base_tweener::clone() const
{
  return do_clone();
}

bool claw::tween::base_tweener::is_finished() const
{
  return do_is_finished();
}

double claw::tween::base_tweener::update(double dt)
{
  CLAW_PRECOND(dt >= 0);
 
  const double result = do_update(dt);
 
  if(is_finished())
    notify_finished();
 
  CLAW_POSTCOND(result <= dt);
  CLAW_POSTCOND(result >= 0);
 
  return result;
}

void claw::tween::base_tweener::on_finished(finish_callback f)
{
  m_on_finished.push_back(f);
}

void claw::tween::base_tweener::notify_finished() const
{
  // If one of the callbacks deletes the tweener, then m_on_finished will not
  // be available. Since we still want to execute all the callbacks, we iterate
  // on a copy of it.
  const std::list<finish_callback> callbacks(m_on_finished);
 
  for(std::list<finish_callback>::const_iterator it = callbacks.begin();
      it != callbacks.end(); ++it)
    (*it)();
}