#ifndef LISTWIDGET_H
#define LISTWIDGET_H

#include <QtGui/QListWidget>

class ListWidget : public QListWidget
{
    Q_OBJECT

public:
    ListWidget( QWidget *parent = 0 );
    ~ListWidget();

private:
	int centralRow();
	void markCentralItem();
	void keyPressEvent( QKeyEvent * );
	void replaseItem( bool up = true );
};

#endif // LISTWIDGET_H

#include "listwidget.h"

#include <QtGui>

ListWidget::ListWidget( QWidget * parent )
    : QListWidget( parent )
{
	QStringList items;
	items << "0" << "1" << "2" << "3" << "4" << "5" << "6" << "7" << "8" << "9";
	addItems( items );
	markCentralItem();
}

ListWidget::~ListWidget()
{
}

int ListWidget::centralRow()
{
	return ( count() % 2 ) ? count() / 2 : count() / 2 - 1; 
}

void ListWidget::markCentralItem()
{
	QFont font = item( centralRow() )->font();
	font.setPointSize( qApp->font().pointSize() * 2 );
	item( centralRow() )->setFont( font );
	setCurrentRow( centralRow() );
}

void ListWidget::replaseItem( bool up )
{
	if( count() )
	{
		QFont font = item( centralRow() )->font();
		font.setPointSize( qApp->font().pointSize() );
		item( centralRow() )->setFont( font );
		if( up ) insertItem( 0, takeItem( count() - 1 ) );
		else insertItem( count(), takeItem( 0 ) );
		markCentralItem();
	}
}

void ListWidget::keyPressEvent( QKeyEvent * event )
{
	if( event->key() == Qt::Key_Up )
		replaseItem( true );
	if( event->key() == Qt::Key_Down )
		replaseItem( false );
}