//------------------------------------------------------------------------------
void MainWindow::sbValueChanged( int value )
{
  TextEdit *viewer = dynamic_cast<TextEdit *>( pTabs->currentWidget() );

  int ind = pTabs->tabToolTip( pTabs->currentIndex() ).toInt();
  int cnt = 0;
  int pos = 0;
  int pos1 = 0;

  int mib = encodingComboBox->itemData( encodingComboBox->currentIndex() ).toInt();
  QTextCodec *codec = QTextCodec::codecForMib( mib );
  QTextStream in( &encodedData[ ind ] );

  in.setAutoDetectUnicode( false );
  in.setCodec( codec );

  QByteArray::ConstIterator itEnd = encodedData[ ind ].constEnd();

  for (QByteArray::ConstIterator it = encodedData[ ind ].constBegin(); it != itEnd; ++it)
  {
    if (*it == '\n')
      ++cnt;

    if (cnt == value)
    {
      pos = std::distance( encodedData[ ind ].constBegin(), it );
      cnt = 0;

      do
      {
        ++it;

        if (it == itEnd)
        {
          pos1 = std::distance( encodedData[ ind ].constBegin(), it );
          break;
        }

        if (*it == '\n')
          ++cnt;
      }
      while (cnt != visibleRowCount);

      pos1 = std::distance( encodedData[ ind ].constBegin(), it );

      break;
    }
  }

  in.seek( pos );
  viewer->clear();
  viewer->appendPlainText( in.read( pos1 - pos ) );
  in.device()->close();
}
//------------------------------------------------------------------------------
void MainWindow::resizeEvent( QResizeEvent *event )
{
  TextEdit *viewer = dynamic_cast<TextEdit *>( pTabs->currentWidget() );
  QFontMetrics fm( viewer->font() );

  visibleRowCount = viewer->height() / fm.height();

  QMainWindow::resizeEvent( event );
}
//------------------------------------------------------------------------------
// После загрузки файла в encodedData вызываешь этот слот
void MainWindow::updateTextEdit()
{
  TextEdit *viewer = dynamic_cast<TextEdit *>( pTabs->currentWidget() );
  viewer->clear();

  int mib = encodingComboBox->itemData( encodingComboBox->currentIndex() ).toInt();
  QTextCodec *codec = QTextCodec::codecForMib( mib );
  int ind = pTabs->tabToolTip( pTabs->currentIndex() ).toInt();
  QTextStream in( &encodedData[ ind ] );

  int data_size = encodedData[ ind ].size();
  int bytesToRead = 0;
  rowCount = 0;

  QByteArray::ConstIterator itEnd = encodedData[ ind ].constEnd();

  for (QByteArray::ConstIterator it = encodedData[ ind ].constBegin(); it != itEnd; ++it)
  {
    if (*it == '\n')
      ++rowCount;

    if (rowCount == visibleRowCount || it == itEnd)
      bytesToRead = std::distance( encodedData[ ind ].constBegin(), it );
  }

  viewer->appendPlainText( in.read( bytesToRead ) );

  scrollBar->setMaximum( rowCount );

  viewer->moveCursor( QTextCursor::Start );
}

#ifndef QMYSCENE_H
#define QMYSCENE_H

#include <QGraphicsScene>
#include <QGraphicsView>
#include <QGraphicsSceneMouseEvent>

class QMyScene : public QGraphicsScene
{
   Q_OBJECT

public:
    QMyScene(QWidget *parent = 0);

    protected:
    void mouseMoveEvent(QGraphicsSceneMouseEvent *event);
    void mousePressEvent(QGraphicsSceneMouseEvent *event);

 signals:
    void CursorSceneCoordsX(QString coordX);
    void CursorSceneCoordsY(QString coordY);

private:

};

#endif // QMYSCENE_H

#include <QDebug>
#include <QGraphicsSceneMouseEvent>
#include "qmyscene.h"

QMyScene::QMyScene(QWidget *parent):
  QGraphicsScene( parent )
{
}

void QMyScene::mouseMoveEvent(QGraphicsSceneMouseEvent *event)
{

     QPointF coords = event->scenePos();
    emit CursorSceneCoordsX(QString::number(coords.x()));
    emit CursorSceneCoordsY(QString::number(coords.y()));
  QGraphicsScene::mouseMoveEvent(event);
}

void QMyScene::mousePressEvent(QGraphicsSceneMouseEvent *event)
{
    qDebug()<<event->button();
  QGraphicsScene::mousePressEvent(e);
}