#include <qquickitemchangelistener_p.h>

Inheritance diagram for QSafeQuickItemChangeListener< Self >:

Collaboration diagram for QSafeQuickItemChangeListener< Self >:

Public Types
template<typename T>
using	InDestructorTest = decltype(T::inDestructor)
template<typename T>
using	WasDeletedTest = decltype(T::wasDeleted)

Public Member Functions
	~QSafeQuickItemChangeListener () override
bool	baseDeleted (const QObject *caller) const override
QString	debugName () const override
Public Member Functions inherited from QQuickItemChangeListener
virtual	~QQuickItemChangeListener ()
virtual void	itemGeometryChanged (QQuickItem *, QQuickGeometryChange, const QRectF &)
virtual void	itemSiblingOrderChanged (QQuickItem *)
virtual void	itemVisibilityChanged (QQuickItem *)
virtual void	itemEnabledChanged (QQuickItem *)
virtual void	itemOpacityChanged (QQuickItem *)
virtual void	itemDestroyed (QQuickItem *)
virtual void	itemChildAdded (QQuickItem , QQuickItem )
virtual void	itemChildRemoved (QQuickItem , QQuickItem )
virtual void	itemParentChanged (QQuickItem , QQuickItem )
virtual void	itemRotationChanged (QQuickItem *)
virtual void	itemImplicitWidthChanged (QQuickItem *)
virtual void	itemImplicitHeightChanged (QQuickItem *)
virtual void	itemFocusChanged (QQuickItem *, Qt::FocusReason)
virtual void	itemScaleChanged (QQuickItem *)
virtual void	itemTransformChanged (QQuickItem , QQuickItem )
virtual QQuickAnchorsPrivate *	anchorPrivate ()
virtual void	addSourceItem (QQuickItem *)
virtual void	removeSourceItem (QQuickItem *)

Detailed Description

template<typename Self>
class QSafeQuickItemChangeListener< Self >

Helper class using CRTP to add tracking of listeners to a QQuickItemChangeListener implementation. Instantiated with the class that implements the QQuickItemChangeListener interface, like

class QQuickThingPrivate : public QQuickItemPrivate,

public QSafeQuickItemChangeListener<QQuickThingPrivate>

QQuickItemPrivate

Definition qquickitem_p.h:237

QSafeQuickItemChangeListener

Definition qquickitemchangelistener_p.h:147

When destroyed, QSafeQuickItemChangeListener will emit warning messages in {-developer-build} configurations when listeners are still registered. As the listener is at this point partially destroyed, any call to the listener interface might result in undefined behavior, such as use-after-free.

Notifications to registered listeners will in addition check if the listener is already in the destructor, and warn if that's the case. The {baseDeleted} override checks for an inDestructor or wasDeleted data member of the class implementing the QSafeQuickItemChangeListener interface.

Definition at line 146 of file qquickitemchangelistener_p.h.