[Qt-interest] Problem customizing QSpinBox

[Judy Duncan]

I'm trying to sub-class a QSpinBox so that I can get a signal when editing
is finished that passes the value in the spinbox along with the signal.
Following some other examples, I have:

 

//*** header ****

#include <QSpinBox>

class SpinBox : public QSpinBox

{

     Q_OBJECT

      public:

         SpinBox (QWidget *parent = 0);

     private slots:

          void valChange ();

    signals:

           void valueUpdate ( int value );

};

 

//*** implementation ****

#include "spinbox.h"

SpinBox::SpinBox(QWidget *parent)

      : QSpinBox(parent)

{

      connect (this, SIGNAL(editingFinished()),

                               this, SLOT(valChange()));

 }

 

void SpinBox::valChange()

{

    emit valueUpdate( this->value() );

}

 

I am using Designer for the mainwindow, so I put a QSpingBox on the form and
then promoted it to a custom SpinBox, giving Designer the appropriate header
file name.

 

When I build the project, I get the following link errors:

C:/DunImg/QtTest/Test2/spinbox.cpp:6: undefined reference to `vtable for
SpinBox'

C:/DunImg/QtTest/Test2/spinbox.cpp:6: undefined reference to `vtable for
SpinBox'

debug/spinbox.o: In function `ZN7SpinBoxC1EP7QWidget':

C:/DunImg/QtTest/Test2/spinbox.cpp:6: undefined reference to `vtable for
SpinBox'

C:/DunImg/QtTest/Test2/spinbox.cpp:6: undefined reference to `vtable for
SpinBox'

debug/spinbox.o: In function `ZN7SpinBox9valChangeEv':

C:/DunImg/QtTest/Test2/spinbox.cpp:13: undefined reference to
`SpinBox::valueUpdate(int)'

collect2: ld returned 1 exit status

 

 

What's the vtable and why does it thing valueUpdate is undefined?

 

Thanks in advance,

Judy

 

 

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