Add a custom widget to a "stock" Qt widget e.g. QSpinBox

[auser]

Hello,

I want to extend a "stock" Qt widget with a custom widget.

For example I want to add a additional button to a spinbox.

To archive this i used the public accessible setLayout() function. The result is not what i epected. I want to add the button left or right of the standard QSpinBox.

See this small snippet.

#include <QApplication>
#include <QHBoxLayout>
#include <QPushButton>
#include <QSpinBox>
 
int main(int argc, char *argv[])
{
  QApplication a(argc, argv);
 
  QSpinBox s;
 
  QHBoxLayout * hbl = new QHBoxLayout();
  hbl->addWidget( new QPushButton("Hello"));
  s.setLayout(hbl);
 
  s.show();
 
  return a.exec();
}

#include <QApplication>
#include <QHBoxLayout>
#include <QPushButton>
#include <QSpinBox>

int main(int argc, char *argv[])
{
  QApplication a(argc, argv);

  QSpinBox s;

  QHBoxLayout * hbl = new QHBoxLayout();
  hbl->addWidget( new QPushButton("Hello"));
  s.setLayout(hbl);

  s.show();

  return a.exec();
}

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qt.jpg

In my real code I have extended the "stock" Qt widget and therefore can also access the protected members.

Hoiw can i access the "real" layout of QSpinBox.

Is there another solution to archive my goal?

Greetings Gerd