[SOLVED] using the same subclass to promote both QSpinBox and QDoubleSpinBox

yanbellavance

I sub-classed QSpinBox to create a custom widget used to promote QSpinBoxes in Qt Designer. Now, I have to promote a QDoubleSpinbox but this of course does not work with a QSpinBox subclass. I would rather not simply copy and modify the subclass as it is inconveninent to maintain. Is there a way that i could have one set of code for both the QSpinBox subclass and the QDoubleSpinBox subclass. The only difference in the 2 sets is that value is an int in one class and a double ni the other. The conflicting area of code relating to this are the calls to value() which are defined in QDoubleSpinBox and QSpinbox but not QAbstractSpinBox.

WORKAROUND: Ok I guess I can just use a QDoubleSpinBox with 0 decimals and get rid of QSpinBox:
@QDoubleSpinBox:setDecimals(0);@

in the end, this was not possible in my case.

andre

Depending on what you are doing exactly, you might be able to use a template class.

@
template<class T>
MySpecialSpinBox: public T
{
//can not use Q_OBJECT macro here!
}

typedef MySpecialIntSpinBox MySpecialSpinBox<QSpinBox>;
typedef MySpecialDoubleSpinBox MySpecialSpinBox<QDoubleSpinBox>;

@

Or something along those lines. Note that moc does not play nice with templates, so you can do nothing that requires moc in such a template.

yanbellavance

since I am using:
@
value();
setValue();
property("newValReady").toBool();
setProperty("writeEnable",writeEnable);
QSpinBox::focusInEvent(event);
QSpinBox::focusOutEvent(event);
QSpinBox::keyPressEvent(event);
QAbstractSpinBox::wheelEvent(event);
etc...
@
I don't think it would work

andre

Still worth a try, I think. You are not adding new stuff that needs the moc to run: no new signals, no new slots.

yanbellavance

here is my class header, does it still look feasable? Actually I am going to try it out and see what it gives.

@class wvSpinBox : public QSpinBox
{
Q_OBJECT
//Q_PROPERTY(bool writeEnable READ writeEnable WRITE setWriteEnable)
public:
explicit wvSpinBox(QWidget *parent = 0);
bool writeEnable() {
return this->property("writeEnable").toBool();
}
void setWriteEnable(const bool & writeEnable){
this->setProperty("writeEnable",writeEnable);
}

bool newValReady() {
    return this->property("newValReady").toBool();
}
void setNewValReady(const bool & newValReady){
    this->setProperty("newValReady",newValReady);
}
int getNewVal();
int oldVal;

public slots:
void when_editingFinished(){

protected:
void focusInEvent ( QFocusEvent * event );
void focusOutEvent ( QFocusEvent * event );
void keyPressEvent ( QKeyEvent * event );
void wheelEvent ( QWheelEvent * event );
void mousePressEvent ( QMouseEvent * event );
void mouseReleaseEvent ( QMouseEvent * event );
signals:
void editStart();
void editStop();
void updEvent();
void stepClicked();

};
@

Also, I would be calling value() and setValue() in the template class which are implemented in QDoubleSpinBox and QSpinBox. Would it still compile? I also call property() and setProperty().

andre

No, forget it. You have several signals and slots. As I said: the template scenario can only work if you don't need moc on it. For signals and slots, you do.

yanbellavance

Ok. Thanks for your help.