surfer/src/pdfdisplay.hpp

#ifndef __PDFDISPLAY_HPP__
#define __PDFDISPLAY_HPP__

#include <QtCore/QFile>
#include <QtGui/QApplication>
#include <QtGui/QImage>
#include <QtGui/QLabel>
#include <QtGui/QMouseEvent>
#include <QtGui/QPainter>
#include <QtGui/QPaintEvent>
#include <QtGui/QToolTip>
#include <QtGui/QWidget>

#include <QtCore/QDebug>

#include <poppler/qt4/poppler-qt4.h>

class PDFDisplay : public QWidget           // picture display widget
{
public:
    PDFDisplay( Poppler::Document *d, bool arthur )
{
    showTextRects = false;
    doc = d;
    m_currentPage = 0;
    if (arthur)
    {
        backendString = "Arthur";
        doc->setRenderBackend(Poppler::Document::ArthurBackend);
    }
    else
    {
        backendString = "Splash";
        doc->setRenderBackend(Poppler::Document::SplashBackend);
    }
    doc->setRenderHint(Poppler::Document::Antialiasing, true);
    doc->setRenderHint(Poppler::Document::TextAntialiasing, true);
}
    ~PDFDisplay()
{
    qDeleteAll(textRects);
    delete doc;
}

    void setShowTextRects(bool show)
{
    showTextRects = show;
}
    void display()
{
    if (doc) {
        Poppler::Page *page = doc->page(m_currentPage);
        if (page) {
            qDebug() << "Displaying page using" << backendString << "backend: " << m_currentPage;
            QTime t = QTime::currentTime();
            image = page->renderToImage();
            qDebug() << "Rendering took" << t.msecsTo(QTime::currentTime()) << "msecs";
            qDeleteAll(textRects);
            if (showTextRects)
            {
                QPainter painter(&image);
                painter.setPen(Qt::red);
                textRects = page->textList();
                for (auto tb(textRects.begin()); tb!=textRects.end(); ++tb)
                  painter.drawRect((*tb)->boundingBox());
            }
            else textRects.clear();
            update();
            delete page;
        }
    } else {
        qWarning() << "doc not loaded";
    }
}

protected:
    void paintEvent( QPaintEvent * )
{
    QPainter paint( this );                     // paint widget
    if (!image.isNull()) {
	paint.drawImage(0, 0, image);
    } else {
	qWarning() << "null image";
    }
}
    void keyPressEvent( QKeyEvent *e )
{
  if (e->key() == Qt::Key_Down)
  {
    if (m_currentPage + 1 < doc->numPages())
    {
      m_currentPage++;
      display();
    }
  }
  else if (e->key() == Qt::Key_Up)
  {
    if (m_currentPage > 0)
    {
      m_currentPage--;
      display();
    }
  }
  else if (e->key() == Qt::Key_Q)
  {
      exit(0);
  }
}
    void mousePressEvent( QMouseEvent *e )
{
  int i = 0;
  for (auto tb(textRects.begin()); tb!=textRects.end(); ++tb)
  {
    if ((*tb)->boundingBox().contains(e->pos()))
    {
      QString tt = QString("Text: \"%1\"\nIndex in text list: %2").arg((*tb)->text()).arg(i);
      QToolTip::showText(e->globalPos(), tt, this);
      break;
    }
    ++i;
  }
}

private:
    int m_currentPage;
    QImage image;
    Poppler::Document *doc;
    QString backendString;
    bool showTextRects;
    QList<Poppler::TextBox*> textRects;
};


#endif