Problem Subclassing Calendar

[Archa4]

I need to create a custom calendar, where i need to change the look of each cell that contains a date. I tried this:

class CustomCalendarWidget : public QCalendarWidget
{
    Q_OBJECT
public:
        CustomCalendarWidget( QWidget* parent = 0 ) : QCalendarWidget( parent ) {}
        ~CustomCalendarWidget() {}
 
protected:
        virtual void paintCell( QPainter* painter, const QRect& rect, const QDate& date ) const
        {
              painter->setPen( Qt::black );
              painter->drawText( rect, Qt::AlignCenter, tr("Qt by Nokia") ); //for example
        }
};

class CustomCalendarWidget : public QCalendarWidget
{
    Q_OBJECT
public:
        CustomCalendarWidget( QWidget* parent = 0 ) : QCalendarWidget( parent ) {}
        ~CustomCalendarWidget() {}

protected:
        virtual void paintCell( QPainter* painter, const QRect& rect, const QDate& date ) const
        {
              painter->setPen( Qt::black );
              painter->drawText( rect, Qt::AlignCenter, tr("Qt by Nokia") ); //for example
        }
};

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But i get errors:

..\Calendar_forum_v2\/customcalendarwidget.h: In member function 'virtual void CustomCalendarWidget::paintCell(QPainter*, const QRect&, const QDate&) const':
 
..\Calendar_forum_v2\/customcalendarwidget.h:17: error: invalid use of incomplete type 'struct QPainter'
 
..\..\..\NokiaQtSDK\Simulator\Qt\mingw\include/QtGui/qwindowdefs.h:68: error: forward declaration of 'struct QPainter'
 
..\Calendar_forum_v2\/customcalendarwidget.h:18: error: invalid use of incomplete type 'struct QPainter'
 
..\..\..\NokiaQtSDK\Simulator\Qt\mingw\include/QtGui/qwindowdefs.h:68: error: forward declaration of 'struct QPainter'

..\Calendar_forum_v2\/customcalendarwidget.h: In member function 'virtual void CustomCalendarWidget::paintCell(QPainter*, const QRect&, const QDate&) const':

..\Calendar_forum_v2\/customcalendarwidget.h:17: error: invalid use of incomplete type 'struct QPainter'

..\..\..\NokiaQtSDK\Simulator\Qt\mingw\include/QtGui/qwindowdefs.h:68: error: forward declaration of 'struct QPainter'

..\Calendar_forum_v2\/customcalendarwidget.h:18: error: invalid use of incomplete type 'struct QPainter'

..\..\..\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?

[wysota]

You forgot to #include <QPainter>.

[Archa4]

Thanks Very much! (such an idiotic mystake by me)

Hm now i have a different kind of problem: In original all the dates from previous and next month were not black colour but black. Now all the dates are black. How should i alter the void PaintCell to make the dates look like original? Can I look anywhere how the void PaintCell was working in original? That way i could alter mine realisation to make the dates from previous and next month gray...

Thanks!

[wysota]

You could look into the source code for the method.

[Archa4]

Em.. I don't want to sound retarded, but where can i look in source code?

[boudie]

Try this location:
<your_qt_dir>/src/gui/widgets/qcalendarwidget.cpp

[Archa4]

Hm... I can only find QCalendarWidget.h files, but there are no QCalendarWidget.cpp anywhere...

Well, with trials and errors i wrote this thing, that seems to be working:

if (this->monthShown()!=date.month())
                painter->setPen(Qt::gray);
              else
                  if (date.dayOfWeek()==6 || date.dayOfWeek()==7)
                      painter->setPen(Qt::red);
                  else
                      painter->setPen(Qt::black);

if (this->monthShown()!=date.month())
                painter->setPen(Qt::gray);
              else
                  if (date.dayOfWeek()==6 || date.dayOfWeek()==7)
                      painter->setPen(Qt::red);
                  else
                      painter->setPen(Qt::black);

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[wysota]

Em.. I don't want to sound retarded, but where can i look in source code?

Download Qt's sources and look there.