I have a simple list to show list of plugins in my program. To customize it i use delegate class derived from QStyledItemDelegate.
The code:
Qt Code: 
  1. class PluginListDelegate : public QStyledItemDelegate
  2. {
  3. public:
  4.     PluginListDelegate();
  5.     void paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const;
  6.     QSize sizeHint(const QStyleOptionViewItem &option, const QModelIndex &index ) const;
  7. private:
  8.     QFont line1;
  9. };
To copy to clipboard, switch view to plain text mode 
Qt Code: 
  1. PluginListDelegate::PluginListDelegate() :
  2.     line1("Tahoma",10,QFont::Bold,false)
  3. {
  4.  
  5. }
  6. void PluginListDelegate::paint(QPainter *painter, const QStyleOptionViewItem &option, const QModelIndex &index) const
  7. {
  8.     QStyledItemDelegate::paint(painter,option,index);
  9.     ...
  10.     ...
  11. }
  12.  
  13. QSize PluginListDelegate::sizeHint(const QStyleOptionViewItem &option, const QModelIndex &index) const
  14. {
  15.     int width = 0,height = 0;    
  16.     QFontMetrics fm1(line1); // <-- crash here
  17.     height = fm1.height() + 20;
  18.     width = fm1.width(name) + 20;
  19.     return QSize(width,height);
  20. }
To copy to clipboard, switch view to plain text mode 

Really don't understand what I do wrong.