OpenBoard/src/pdf-merger/CropBoxElementHandler.h

/*
 * 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 CROPBOX_ELEMENT_HANDLER_H
#define CROPBOX_ELEMENT_HANDLER_H

#include "AbstractBoxElementHandler.h"
#include "Rectangle.h"

namespace merge_lib
{
   //class for processing CropBox field of Page object
   class CropBoxElementHandler: public AbstractBoxElementHandler
   {
   public:
      CropBoxElementHandler(Object * page): AbstractBoxElementHandler(page)
      {
         _setHandlerName("/CropBox");
      }
      virtual ~CropBoxElementHandler()
      {
      }
   private:

      //replace CropBox with BBox
      virtual void _changeObjectContent(unsigned int startOfPageElement)
      {
         Rectangle mediaBox("/CropBox", _page->getObjectContent());

         double shiftX = Utils::doubleEquals(mediaBox.x1,0)?0:-mediaBox.x1;
         double shiftY = Utils::doubleEquals(mediaBox.y1,0)?0:-mediaBox.y1;

         mediaBox.setNewRectangleName("/BBox");

         unsigned int endOfElement = _findEndOfElementContent(startOfPageElement);
         _page->forgetAboutChildren(startOfPageElement,endOfElement);
         _page->eraseContent(startOfPageElement,endOfElement-startOfPageElement);

         std::string newContent;
         mediaBox.appendRectangleToString(newContent," ");
         _page->insertToContent(startOfPageElement, newContent);

         std::stringstream matrix;
         matrix<<"/Matrix [ 1 0 0 1 "<<shiftX<<" "<< shiftY<<" ]\n";
         _page->insertToContent(startOfPageElement, matrix.str());
      }
      void _pageElementNotFound()
      {		  		
         _retrieveBoxFromParent();
      }
   };
}

#endif // CROPBOX_ELEMENT_HANDLER_H