I need to create a custom calendar, where i need to change the look of each cell that contains a date. I tried this:
Qt Code: 
  1. class CustomCalendarWidget : public QCalendarWidget
  2. {
  3.     Q_OBJECT
  4. public:
  5.         CustomCalendarWidget( QWidget* parent = 0 ) : QCalendarWidget( parent ) {}
  6.         ~CustomCalendarWidget() {}
  7.  
  8. protected:
  9.         virtual void paintCell( QPainter* painter, const QRect& rect, const QDate& date ) const
  10.         {
  11.               painter->setPen( Qt::black );
  12.               painter->drawText( rect, Qt::AlignCenter, tr("Qt by Nokia") ); //for example
  13.         }
  14. };
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But i get errors:
Qt Code: 
  1. ..\Calendar_forum_v2\/customcalendarwidget.h: In member function 'virtual void CustomCalendarWidget::paintCell(QPainter*, const QRect&, const QDate&) const':
  2.  
  3. ..\Calendar_forum_v2\/customcalendarwidget.h:17: error: invalid use of incomplete type 'struct QPainter'
  4.  
  5. ..\..\..\NokiaQtSDK\Simulator\Qt\mingw\include/QtGui/qwindowdefs.h:68: error: forward declaration of 'struct QPainter'
  6.  
  7. ..\Calendar_forum_v2\/customcalendarwidget.h:18: error: invalid use of incomplete type 'struct QPainter'
  8.  
  9. ..\..\..\NokiaQtSDK\Simulator\Qt\mingw\include/QtGui/qwindowdefs.h:68: error: forward declaration of 'struct QPainter'
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Could someone please explain to me - what am I doing wrong?