message_filter_display.h

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/*
 * Copyright (c) 2012, Willow Garage, Inc.
 * All rights reserved.
 *
 * Redistribution and use in source and binary forms, with or without
 * modification, are permitted provided that the following conditions are met:
 *
 *     * Redistributions of source code must retain the above copyright
 *       notice, this list of conditions and the following disclaimer.
 *     * Redistributions in binary form must reproduce the above copyright
 *       notice, this list of conditions and the following disclaimer in the
 *       documentation and/or other materials provided with the distribution.
 *     * Neither the name of the Willow Garage, Inc. nor the names of its
 *       contributors may be used to endorse or promote products derived from
 *       this software without specific prior written permission.
 *
 * THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS "AS IS"
 * AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT LIMITED TO, THE
 * IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR A PARTICULAR PURPOSE
 * ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT OWNER OR CONTRIBUTORS BE
 * LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, SPECIAL, EXEMPLARY, OR
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 * INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF LIABILITY, WHETHER IN
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 * ARISING IN ANY WAY OUT OF THE USE OF THIS SOFTWARE, EVEN IF ADVISED OF THE
 * POSSIBILITY OF SUCH DAMAGE.
 */
#ifndef MESSAGE_FILTER_DISPLAY_H
#define MESSAGE_FILTER_DISPLAY_H

#include <OGRE/OgreSceneManager.h>
#include <OGRE/OgreSceneNode.h>

#ifndef Q_MOC_RUN
#include <message_filters/subscriber.h>
#include <tf/message_filter.h>
#endif

#include "rviz/display_context.h"
#include "rviz/frame_manager.h"
#include "rviz/properties/ros_topic_property.h"

#include "rviz/display.h"

namespace rviz
{

class _RosTopicDisplay: public Display
{
Q_OBJECT
public:
  _RosTopicDisplay()
    {
      topic_property_ = new RosTopicProperty( "Topic", "",
                                              "", "",
                                              this, SLOT( updateTopic() ));
    }

protected Q_SLOTS:
  virtual void updateTopic() = 0;

protected:
  RosTopicProperty* topic_property_;
};

template<class MessageType>
class MessageFilterDisplay: public _RosTopicDisplay
{
// No Q_OBJECT macro here, moc does not support Q_OBJECT in a templated class.
public:
  typedef MessageFilterDisplay<MessageType> MFDClass;

  MessageFilterDisplay()
    : tf_filter_( NULL )
    , messages_received_( 0 )
    {
      QString message_type = QString::fromStdString( ros::message_traits::datatype<MessageType>() );
      topic_property_->setMessageType( message_type );
      topic_property_->setDescription( message_type + " topic to subscribe to." );
    }

  virtual void onInitialize()
    {
      tf_filter_ = new tf::MessageFilter<MessageType>( *context_->getTFClient(),
                                                       fixed_frame_.toStdString(), 10, update_nh_ );

      tf_filter_->connectInput( sub_ );
      tf_filter_->registerCallback( boost::bind( &MessageFilterDisplay<MessageType>::incomingMessage, this, _1 ));
      context_->getFrameManager()->registerFilterForTransformStatusCheck( tf_filter_, this );
    }

  virtual ~MessageFilterDisplay()
    {
      unsubscribe();
      delete tf_filter_;
    }

  virtual void reset()
    {
      Display::reset();
      tf_filter_->clear();
      messages_received_ = 0;
    }

protected:
  virtual void updateTopic()
    {
      unsubscribe();
      reset();
      subscribe();
      context_->queueRender();
    }

  virtual void subscribe()
    {
      if( !isEnabled() )
      {
        return;
      }

      try
      {
        sub_.subscribe( update_nh_, topic_property_->getTopicStd(), 10 );
        setStatus( StatusProperty::Ok, "Topic", "OK" );
      }
      catch( ros::Exception& e )
      {
        setStatus( StatusProperty::Error, "Topic", QString( "Error subscribing: " ) + e.what() );
      }
    }

  virtual void unsubscribe()
    {
      sub_.unsubscribe();
    }

  virtual void onEnable()
    {
      subscribe();
    }

  virtual void onDisable()
    {
      unsubscribe();
      reset();
    }

  virtual void fixedFrameChanged()
    {
      tf_filter_->setTargetFrame( fixed_frame_.toStdString() );
      reset();
    }

  void incomingMessage( const typename MessageType::ConstPtr& msg )
    {
      if( !msg )
      {
        return;
      }

      ++messages_received_;
      setStatus( StatusProperty::Ok, "Topic", QString::number( messages_received_ ) + " messages received" );

      processMessage( msg );
    }

  virtual void processMessage( const typename MessageType::ConstPtr& msg ) = 0;

  message_filters::Subscriber<MessageType> sub_;
  tf::MessageFilter<MessageType>* tf_filter_;
  uint32_t messages_received_;
};

} // end namespace rviz

#endif // MESSAGE_FILTER_DISPLAY_H