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QDirModel *dm = new QDirModel(this);
QTreeView *tw = new QTreeView(this);
tw->setModel(dm);

QPalette::ColorGroup cg = option.state & QStyle::State_Enabled ? QPalette::Normal : QPalette::Disabled;
if(option.state & QStyle::State_Selected){
  painter->fillRect(option.rect, option.palette.color(cg, QPalette::Highlight));
}

int x = option.rect.x();
int y = option.rect.y();

painter->drawPixmap(x+offset, y+offset, QPixmap());

drawFocus(painter, option, option.rect.adjusted(0, 0, -1, -1));

QItemDelegate::paint(painter, opt, index);

class BarDelegate : public QAbstractItemDelegate
{
public:
BarDelegate( QObject *parent = 0 );
void paint( QPainter *painter,
const QStyleOptionViewItem &option,
const QModelIndex &index ) const;
QSize sizeHint( const QStyleOptionViewItem &option,
const QModelIndex &index ) const;
};

QSize BarDelegate::sizeHint( const QStyleOptionViewItem &option,
const QModelIndex &index ) const
{
return QSize( 45, 15 );
}

void BarDelegate::paint( QPainter *painter,
const QStyleOptionViewItem &option, const QModelIndex &index ) const
{
if( option.state & QStyle::State_Selected )
painter->fillRect( option.rect, option.palette.highlight() );
int value = index.model()->data( index, Qt::DisplayRole ).toInt();
double factor = (double)value/100.0;
painter->save();
if( factor > 1 )
{
painter->setBrush( Qt::red );
factor = 1;
}
else
painter->setBrush( QColor( 0, (int)(factor*255), 255-(int)(factor*255) ) );
painter->setPen( Qt::black );
painter->drawRect( option.rect.x()+2, option.rect.y()+2,
(int)(factor*(option.rect.width()-5)), option.rect.height()-5 );
painter->restore();
}

QTableView table;
QStandardItemModel model( 10, 2 );
for( int r=0; r<10; ++r )
{
QStandardItem *item = new QStandardItem( QString("Row %1").arg(r+1) );
item->setEditable( false );
model.setItem( r, 0, item );
model.setItem( r, 1, new QStandardItem( QString::number((r*30)%100 )) );
}
table.setModel( &model );
BarDelegate delegate;
table.setItemDelegateForColumn( 1, &delegate );

void PatchItemDelegate::paint(QPainter *p, const QStyleOptionViewItem & o, const QModelIndex & i) const {
	const_cast<PatchItemDelegate*>(this)->m_Operation = i.data(OperationRole).toInt();
	QItemDelegate::paint(p, o, i);
}
void PatchItemDelegate::drawDecoration(QPainter *p, const QStyleOptionViewItem & o, const QRect & r, const QPixmap & px) const {
	QItemDelegate::drawDecoration(p,o,r,px);

	if (m_Operation == None) return;

	int x = r.topLeft().x();
	int y = r.topLeft().y() + r.height()/3;

	p->drawPixmap(x,y, QPixmap(m_IconFiles[m_Operation]));
}