Ownership with Q3DSurface

[beecksche]

Hi everybody,
i use the Q3DSurface class, but i'm not quite sure if i need to destroy the instances in the destructor or not.

MyClass.h

class MyClass : public QMainWindow
{
	Q_OBJECT
public:
	MyClass(QWidget*parent = 0);
	~MyClass();

private:
	Ui::MyClass_GUIClass ui;

	Q3DSurface					*m_graph;
	QWidget 					*m_grapWidget;

	MyAbstractListModel			*m_model;
	QItemModelSurfaceDataProxy	*m_proxy;
	QSurface3DSeries			*m_series;
}

MyClass.cpp

MyClass::MyClass(QWidget*parent) : QMainWindow(parent)
{
	ui.setupUi(this);

	m_graph = new Q3DSurface();
	m_graphWidget = QWidget::createWindowContainer(m_graph);
	ui.verticalLayout->addWidget(m_graphWidget);

	m_model= new MyAbstractListModel();
	m_proxy= new QItemModelSurfaceDataProxy(m_model, QStringLiteral("radius"), QStringLiteral("angle"), QStringLiteral("value"));

	m_series = new QSurface3DSeries(m_proxy);

	m_graph->addSeries(m_series);

	fillModelWithData();
}

MyClass::~MyClass()
{
	// do i need to destroy something?
}

Thanks !

[A Former User]

Hi!

m_graphWidget = QWidget::createWindowContainer(m_graph);

The container m_graphWidget takes ownership of m_graph.

ui.verticalLayout->addWidget(m_graphWidget);

This will make m_graphWidget a child of the widget that holds verticalLayout.

m_model= new MyAbstractListModel();

m_model doesn't have a parent.

m_proxy= new QItemModelSurfaceDataProxy(m_model, QStringLiteral("radius"), QStringLiteral("angle"), QStringLiteral("value"));

The proxy doesn't take ownership of the itemModel and you don't give a parent to QItemModelSurfaceDataProxy().

m_series = new QSurface3DSeries(m_proxy);
m_graph->addSeries(m_series);

You don't pass a parent to QSurface3DSeries().
Looking at the docs it's not clear to me whether or not addSeries reparents it. But it wouldn't matter anyways if you'd pass a parent to QSurface3DSeries().

------------------------------

• m_graph and m_graphWidget already get destroyed automatically
• Pass a parent to MyAbstractListModel()
• Pass a parent to QItemModelSurfaceDataProxy()
• Pass a parent to QSurface3DSeries()

[beecksche]

@Wieland
Thanks for the informations!

In the Surface Example they only delete the Q3DSurface instance.

But i will pass the parents to the classes, so i can be sure, that they are destroyed. Thanks!