PdfCropping.h

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/******************************************************************************************************
 * (C) 2014 markummitchell@github.com. This file is part of Engauge Digitizer, which is released      *
 * under GNU General Public License version 2 (GPLv2) or (at your option) any later version. See file *
 * LICENSE or go to gnu.org/licenses for details. Distribution requires prior written permission.     *
 ******************************************************************************************************/
 
#ifndef PDF_CROPPING_H
#define PDF_CROPPING_H
 
#include <QRect>
#include <QSize>
 
class PdfFrameHandle;
class QGraphicsRectItem;
class QGraphicsScene;
class QPointF;
class ViewPreview;

class PdfCropping
{
public:
  PdfCropping(QGraphicsScene &scene,
              ViewPreview &view);

  QRectF frameRect () const;

  void moveBL (const QPointF &newPos,
               const QPointF &oldPos);

  void moveBR (const QPointF &newPos,
               const QPointF &oldPos);

  void moveTL (const QPointF &newPos,
               const QPointF &oldPos);

  void moveTR (const QPointF &newPos,
               const QPointF &oldPos);
 
  static const int PDF_CROPPING_BOTTOM = 1; 
  static const int PDF_CROPPING_LEFT   = 2; 
  static const int PDF_CROPPING_RIGHT  = 4; 
  static const int PDF_CROPPING_TOP    = 8; 

  QSize windowSize () const;
 
private:
  PdfCropping ();
 
  void createWidgets (QGraphicsScene &scene);
  void disableEventsWhileMovingAutomatically();
  void enableEventsWhileMovingAutomatically();
  QRectF rectFromTLAndBR () const;
  void updateBox();
 
  ViewPreview &m_view;
 
  // Box
  QGraphicsRectItem *m_box;
 
  // Handles
  PdfFrameHandle *m_handleTL;
  PdfFrameHandle *m_handleTR;
  PdfFrameHandle *m_handleBR;
  PdfFrameHandle *m_handleBL;
 
};
 
#endif // PDF_CROPPING_H