graphicsnode.h

/*
    QSapecNG - Qt based SapecNG GUI front-end
    Copyright (C) 2009, Michele Caini

    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 3 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, see <http://www.gnu.org/licenses/>.
*/


#ifndef GRAPHICSNODE_H
#define GRAPHICSNODE_H


#include "gui/editor/inode.h"
#include "gui/editor/item.h"

#include <QtGui/QGraphicsItem>
#include <QtGui/QPainterPath>

#include <QtCore/QExplicitlySharedDataPointer>
#include <QtCore/QSet>


namespace qsapecng
{


class GraphicsNode: public QGraphicsItem
{

public:
  enum { Type = UserType + 128 };
  enum { Radius = 1 };

public:
  GraphicsNode(
    QGraphicsItem* parent = 0,
    QGraphicsScene* scene = 0
  );
  virtual ~GraphicsNode();

  inline int type() const { return GraphicsNode::Type; }

  void paint(
    QPainter* painter,
    const QStyleOptionGraphicsItem* option,
    QWidget* widget
  );

  QRectF boundingRect() const;
  QPainterPath shape() const;

  void attach(GraphicsNode* item);
  void detach(GraphicsNode* item);

  void setNode(Node* node);
  const Node* constNode() const;
  Node* node() const;

  void updateItemSet();
  const QSet<GraphicsNode*>& itemSet() const;
  bool isColliding() const;

  void showNodeValue();
  void hideNodeValue();

  void setOwner(Item* owner);
  Item* owner() const;

protected:
  virtual QVariant itemChange(GraphicsItemChange change, const QVariant& value);

private:
  void updateLabelPosition();

private:
  Item* owner_;

  bool colliding_;
  QSet<GraphicsNode*> itemSet_;
  QExplicitlySharedDataPointer<Node> dataPointer_;

  QGraphicsTextItem* label_;
  QPainterPath path_;

};


}


#endif // GRAPHICSNODE_H