PositionProvider.h

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/*
   For more information, please see: http://software.sci.utah.edu

   The MIT License

   Copyright (c) 2012 Scientific Computing and Imaging Institute,
   University of Utah.

   License for the specific language governing rights and limitations under
   Permission is hereby granted, free of charge, to any person obtaining a
   copy of this software and associated documentation files (the "Software"),
   to deal in the Software without restriction, including without limitation
   the rights to use, copy, modify, merge, publish, distribute, sublicense,
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   The above copyright notice and this permission notice shall be included
   in all copies or substantial portions of the Software.

   THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
   OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
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#ifndef POSITION_PROVIDER_H
#define POSITION_PROVIDER_H

#include <boost/shared_ptr.hpp>
#include <QPointF>

class QGraphicsProxyWidget;

namespace SCIRun {
namespace Gui {

class PositionProvider
{
public:
  virtual ~PositionProvider() {}
  virtual QPointF currentPosition() const = 0;
};

typedef boost::shared_ptr<PositionProvider> PositionProviderPtr;

class NeedsScenePositionProvider
{
public:
  virtual ~NeedsScenePositionProvider() {}
  void setPositionObject(PositionProviderPtr provider) 
  { 
    positionProvider_ = provider; 
  }
  PositionProviderPtr getPositionObject() const { return positionProvider_; }
protected:
  PositionProviderPtr positionProvider_;
};

class ProxyWidgetPosition : public PositionProvider
{
public:
  explicit ProxyWidgetPosition(QGraphicsProxyWidget* widget, const QPointF& offset = QPointF());
  virtual QPointF currentPosition() const override;
private:
  QGraphicsProxyWidget* widget_;
  QPointF offset_;
};

class MidpointPositioner : public PositionProvider
{
public:
  MidpointPositioner(PositionProviderPtr p1, PositionProviderPtr p2);
  virtual QPointF currentPosition() const override;
private:
  PositionProviderPtr p1_, p2_;
};

class PassThroughPositioner : public PositionProvider
{
public:
  explicit PassThroughPositioner(const QGraphicsProxyWidget* widget);
  virtual QPointF currentPosition() const override;
private:
  const QGraphicsProxyWidget* widget_;
};

}
}

#endif