QPropertyDelayedNotifications Struct Reference

Collaboration diagram for QPropertyDelayedNotifications:

Public Member Functions
void	addProperty (const QPropertyBindingData *bindingData, QUntypedPropertyData *propertyData)
void	evaluateBindings (PendingBindingObserverList &bindingObservers, qsizetype index, QBindingStatus *status)
void	notify (qsizetype index)

Public Attributes
int	ref = 0
QPropertyDelayedNotifications *	next = nullptr
qsizetype	used = 0
QPropertyProxyBindingData	delayedProperties [size]

Static Public Attributes
static constexpr auto	PageSize = 4096
static constexpr qsizetype	size = (PageSize - 3*sizeof(void *))/sizeof(QPropertyProxyBindingData)

Detailed Description

QPropertyDelayedNotifications is used to manage delayed notifications in grouped property updates. It acts as a pool allocator for QPropertyProxyBindingData, and has methods to manage delayed notifications.

See also

beginPropertyUpdateGroup, endPropertyUpdateGroup

Definition at line 67 of file qproperty.cpp.

Member Function Documentation

addProperty()

void QPropertyDelayedNotifications::addProperty ( const QPropertyBindingData * bindingData, QUntypedPropertyData * propertyData )

inline

This method is called when a property attempts to notify its observers while inside of a property update group. Instead of actually notifying, it replaces bindingData's d_ptr with a QPropertyProxyBindingData. bindingData and propertyData are the binding data and property data of the property whose notify call gets delayed.

See also

QPropertyBindingData::notifyObservers

Definition at line 89 of file qproperty.cpp.

References QtPrivate::QPropertyBindingData::BindingBit, QtPrivate::QPropertyBindingData::DelayedNotificationBit, delayedProperties, QtPrivate::QPropertyBindingData::isNotificationDelayed(), next, and Q_ASSERT.

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evaluateBindings()

void QPropertyDelayedNotifications::evaluateBindings ( PendingBindingObserverList & bindingObservers, qsizetype index, QBindingStatus * status )

inline

Called in Qt::endPropertyUpdateGroup. For the QPropertyProxyBindingData at position index, it \list

• restores the original binding data that was modified in addProperty and
• evaluates any bindings which depend on properties that were changed inside the group. \endlist Change notifications are sent later with notify (following the logic of separating binding updates and notifications used in non-deferred updates).

Definition at line 124 of file qproperty.cpp.

References QtPrivate::QPropertyBindingData::DelayedNotificationBit, delayedProperties, QPropertyObserverPointer::evaluateBindings(), QPropertyProxyBindingData::originalBindingData, and Q_ASSERT.

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notify()

void QPropertyDelayedNotifications::notify ( qsizetype index )

inline

Called in Qt::endPropertyUpdateGroup. For the QPropertyProxyBindingData at position i, it \list

• resets the proxy binding data and
• sends any pending notifications. \endlist

Definition at line 152 of file qproperty.cpp.

References QtPrivate::QPropertyBindingData::BindingBit, delayedProperties, and QPropertyProxyBindingData::originalBindingData.

Member Data Documentation

delayedProperties

QPropertyProxyBindingData QPropertyDelayedNotifications::delayedProperties[size]

Definition at line 78 of file qproperty.cpp.

Referenced by addProperty(), evaluateBindings(), and notify().

next

QPropertyDelayedNotifications* QPropertyDelayedNotifications::next = nullptr

Definition at line 73 of file qproperty.cpp.

Referenced by addProperty().

PageSize

constexpr auto QPropertyDelayedNotifications::PageSize = 4096

inlinestaticconstexpr

Definition at line 71 of file qproperty.cpp.

ref

int QPropertyDelayedNotifications::ref = 0

Definition at line 72 of file qproperty.cpp.

Referenced by QProperty< T >::beginPropertyUpdateGroup().

size

constexpr qsizetype QPropertyDelayedNotifications::size = (PageSize - 3*sizeof(void *))/sizeof(QPropertyProxyBindingData)

staticconstexpr

Definition at line 77 of file qproperty.cpp.

used

qsizetype QPropertyDelayedNotifications::used = 0

Definition at line 74 of file qproperty.cpp.

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The documentation for this struct was generated from the following file:

• qtbase/src/corelib/kernel/qproperty.cpp (476e503cfbc42b8ea9e94a1f536d443fc8ce69c0)