How to populate Spinboxes on scroll area

[summit]

This is my code where i am trying to populate spin boxes in the scroll area but the window shows without the scroll area and the spinboxes.

void ShowCommands::showWindow()
{
	QWidget *wdg = new QWidget;
	QVBoxLayout m_layout{ wdg };
	QScrollArea m_area;
	QWidget m_contents;
	QVBoxLayout m_contentsLayout{ &m_contents };
	QSpinBox m_spinBoxes[10];
	m_layout.addWidget(&m_area);
	m_area.setWidget(&m_contents);
	for (auto & spinbox : m_spinBoxes)
		m_contentsLayout.addWidget(&spinbox);
	
	m_contentsLayout.setSizeConstraint(QLayout::SetMinimumSize);
	wdg->setWindowTitle("Commands");
	wdg->show();
}

[jsulm]

@summit said in How to populate Spinboxes on scroll area:

QSpinBox m_spinBoxes[10];

This is local arrray which is destroyed together with all spin boxes as soon as showWindow() finishes...
Also QVBoxLayout m_layout{ wdg }; QScrollArea m_area; QWidget m_contents; are local stack variables...

[summit]

This post is deleted!

[summit]

@jsulm i have changed my code but still spinboxes are missing from the window.

QWidget *wdg = new QWidget;
	QVBoxLayout *m_layout = new QVBoxLayout;
	QScrollArea *m_area = new QScrollArea;
	QWidget *m_contents = new QWidget;
	QVBoxLayout *m_contentsLayout = new QVBoxLayout;
	m_contentsLayout->setParent(m_contents);
	m_layout->addWidget(m_area);
	m_area->setWidget(m_contents);
	for (auto & spinbox : m_spinBoxes)  // m_spinBoxes is class varibles QSpinBox m_spinBoxes[10]
		m_contentsLayout->addWidget(&spinbox);

	m_contentsLayout->setSizeConstraint(QLayout::SetMinimumSize);
	wdg->setLayout(m_layout);
	wdg->setWindowTitle("Commands");
	wdg->show();

[JonB]

@summit said in How to populate Spinboxes on scroll area:

m_contentsLayout->setParent(m_contents);

I'm not sure this is good enough. Where did you get the inspiration to do it this way? The usual is m_contents->setLayout(m_contentsLayout)?

[jsulm]

@summit With your current code you'll get a warning at runtime, check that.
This works:

QWidget *wdg = new QWidget;
QVBoxLayout *m_layout = new QVBoxLayout;
QScrollArea *m_area = new QScrollArea;
QWidget *m_contents = new QWidget;
QVBoxLayout *m_contentsLayout = new QVBoxLayout;
m_contents->setLayout(m_contentsLayout);
m_layout->addWidget(m_area);
m_area->setWidget(m_contents);
for (auto & spinbox : m_spinBoxes)  // m_spinBoxes is class varibles QSpinBox m_spinBoxes[10]
    m_contentsLayout->addWidget(&spinbox);

m_contentsLayout->setSizeConstraint(QLayout::SetMinimumSize);
wdg->setLayout(m_layout);
wdg->setWindowTitle("Commands");
wdg->show();

But since wdg is not parented it will be shown in its own window...

[summit]

@jsulm Thank you very much this works.