void ListBoxDnd::updateLine( const QPoint & dragPos )
{
QListBox * src = (QListBox *) this->src;
QListBoxItem *item = itemAt( dragPos );
int ypos = item ?
( src->itemRect( item ).bottom() - ( line->height() / 2 ) ) :
( src->itemRect( ((QListBox *)src)->firstItem() ).top() );
line->resize( src->viewport()->width(), line->height() );
line->move( 0, ypos );
}
QListBoxItem * ListBoxDnd::itemAt( QPoint pos )
{
QListBox * src = (QListBox *) this->src;
QListBoxItem * result = src->itemAt( pos );
QListBoxItem * last = src->item( src->count() - 1 );
int i = src->index( result );
if ( result && ( pos.y() < (src->itemRect(result).top() + src->itemHeight(i)/2) ) )
result = result->prev();
else if ( !result && pos.y() > src->itemRect( last ).bottom() )
result = last;
return result;
}