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OpenBoard/thirdparty/mera/pdf-merger/AbstractBoxElementHandler.h

60 lines
1.9 KiB

#if !defined AbstractBoxElementHandler_h
#define AbstractBoxElementHandler_h
#include "PageElementHandler.h"
namespace merge_lib
{
//class for processing MediaBox field of Page object
class AbstractBoxElementHandler: public PageElementHandler
{
public:
AbstractBoxElementHandler(Object * page): PageElementHandler(page)
{
}
virtual ~AbstractBoxElementHandler()
{
}
protected:
void _retrieveBoxFromParent()
{
std::string content = _page->getObjectContent();
std::string mediaBox;
Object * parent = _page;
while(1)
{
unsigned int startOfParent = content.find("/Parent");
unsigned int endOfParent = content.find(" R", startOfParent);
if(startOfParent == std::string::npos)
break;
std::vector <Object *> parents = parent->getChildrenByBounds(startOfParent, endOfParent);
if(parents.size() != 1)
break;
parent = parents[0];
std::string parentContent = parent->getObjectContent();
unsigned int startOfMediaBox = parentContent.find(_handlerName);
if(startOfMediaBox == std::string::npos)
{
content = parentContent;
continue;
}
unsigned int endOfMediaBox = parentContent.find("]", startOfMediaBox);
mediaBox = parentContent.substr(startOfMediaBox, endOfMediaBox - startOfMediaBox + 1);
break;
}
if(!mediaBox.empty())
{
unsigned int startOfMediaBox = _page->getObjectContent().rfind(">>");
_page->insertToContent(startOfMediaBox, mediaBox);
_changeObjectContent(startOfMediaBox);
}
}
private:
virtual void _changeObjectContent(unsigned int startOfPageElement) = 0;
};
}
#endif