Kanzi Framework  3.9.0
Kanzi Engine API
kanzi::DataContext Class Referenceabstract

DataContext acts as a container for data. More...

#include <kanzi/core.ui/data/data_context.hpp>

Inheritance diagram for kanzi::DataContext:
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Classes

struct  ModifiedSubscription
 Subscription entry. More...
 

Public Types

typedef function< void()> ModifiedFunction
 Callback function type for change subscriptions. More...
 
typedef shared_ptr< void > ModifiedSubscriptionToken
 Token type that can be used to identify the change subscription. More...
 
- Public Types inherited from kanzi::PropertyObject
typedef PropertyStorageContainer::const_iterator PropertyStorageConstIterator
 
typedef vector< PropertyStoragePtrPropertyStorageContainer
 
typedef PropertyStorageContainer::iterator PropertyStorageIterator
 
typedef intrusive_ptr< AbstractPropertyTypeDescriptor::PropertyStoragePropertyStoragePtr
 
typedef PropertyStorageContainer::reverse_iterator PropertyStorageReverseIterator
 

Public Member Functions

ModifiedSubscriptionToken addModifiedNotificationHandler (ModifiedFunction callback)
 Allows to subscribe to modifications in this data context. More...
 
virtual DataObjectSharedPtr getData ()=0
 Retrieves the root object of the underlying data tree. More...
 
virtual DataContextSharedPtr lookupDataContext (string_view relativePath)=0
 Performs object look-up by path. More...
 
template<typename Type >
shared_ptr< Type > lookupDataContextOfType (string_view relativePath)
 
void notifyModified ()
 Triggers modification procedure in this data context, which invokes the subscriptions. More...
 
void removeModifiedNotificationHandler (ModifiedSubscriptionToken token)
 Allows to unsubscribe from modifications in this data context. More...
 
- Public Member Functions inherited from kanzi::Resource
virtual unsigned int getCPUMemoryUsage () const
 Function for getting the memory usage of a resource. More...
 
const string & getName () const
 Gets the resource name. More...
 
const string & getUrl () const
 Gets the resource URL. More...
 
bool isKeepAlive () const
 Tells if the resource has keep alive flag set. More...
 
void reload ()
 
void reloadFromFile (string_view filePath)
 
void reloadFromKzb (KzbFile &kzbFile, ReadOnlyMemoryFile &file, KzbMemoryParser &parser)
 
 Resource (Domain *domain, string_view name)
 Constructor. More...
 
void setKeepAlive (bool keepAlive)
 Sets the keep alive flag. More...
 
void setUrl (string_view url)
 Sets the resource URL. More...
 
 ~Resource () override
 Destructor. More...
 
- Public Member Functions inherited from kanzi::Object
AppliedStyleEntrySharedPtr applyObjectStyle (kanzi::StyleSharedPtr style)
 Applies a style to an object. More...
 
void applyObjectStyles ()
 Apply all styles for an object node. More...
 
DomaingetDomain () const
 Returns the domain the object belongs to. More...
 
const MetaclassgetDynamicMetaclass () const override
 Returns the metaclass of the dynamic type of the object. More...
 
MainLoopSchedulergetMainLoopScheduler () const
 Returns the MainLoopScheduler instance of the associated Domain. More...
 
detail::MessageDispatcher * getMessageDispatcher () const
 Returns the message dispatcher of the object. More...
 
ResourceManagergetResourceManager () const
 Returns the resource manager of the object. More...
 
ScriptingContextSharedPtr getScriptingContext () const
 Gets the scripting context of the object. More...
 
 Object (Domain *domain)
 
void setScriptingContext (ScriptingContextSharedPtr context)
 Sets the scripting context of the object. More...
 
void unapplyObjectStyle (AppliedStyleEntrySharedPtr appliedStyleEntry)
 
void unapplyObjectStyles ()
 Unapplies and removes all applied styles. More...
 
 ~Object () override
 
- Public Member Functions inherited from kanzi::MetaObject
bool isTypeOf (const Metaclass *objectType) const
 Determines if the type of this object is the given type or derived from it. More...
 
virtual ~MetaObject ()
 
- Public Member Functions inherited from kanzi::PropertyObject
template<typename DataType >
void addPropertyModifier (const PropertyType< DataType > &propertyType, typename PropertyType< DataType >::Descriptor::ModifierCallback callback, void *owner)
 
template<typename DataType >
void addPropertyNotificationHandler (const PropertyType< DataType > &propertyType, typename PropertyType< DataType >::Descriptor::NotificationCallback callback, void *owner)
 
template<typename DataType >
void addPropertyValueSource (const PropertyType< DataType > &propertyType, typename PropertyType< DataType >::Descriptor::TypedValueSource *valueSource, PropertyValuePrecedence precedence, void *ownerPointer)
 
template<typename DataType >
void addPropertyValueSource (const PropertyType< DataType > &propertyType, typename PropertyType< DataType >::Descriptor::TypedValueSource *valueSource, PropertyValuePrecedence precedence, AbstractPropertyTypeDescriptor::ValueSourceOwner *owner)
 
PropertyStorageContainer::iterator beginPropertyStorage ()
 Returns the begin iterator to the internal property storage container. More...
 
PropertyStorageContainer::const_iterator beginPropertyStorage () const
 Returns the begin iterator to the internal property storage container. More...
 
void clearPropertyFlag (AbstractPropertyType propertyType, uint32_t flag)
 
void copyLocalValue (const PropertyObject &other, AbstractPropertyType propertyType)
 Copies local value of single property from another object. More...
 
void copyLocalValues (const PropertyObject &other)
 Copies all local values from another object. More...
 
PropertyStorageContainer::iterator endPropertyStorage ()
 Returns the end iterator to the internal property storage container. More...
 
PropertyStorageContainer::const_iterator endPropertyStorage () const
 Returns the end iterator to the internal property storage container. More...
 
template<typename DataType >
PropertyType< DataType >::Traits::ReturnType getAbstractProperty (AbstractPropertyType abstractPropertyType) const
 
template<typename DataType >
PropertyType< DataType >::Traits::ReturnType getAbstractPropertyBase (AbstractPropertyType abstractPropertyType) const
 
template<typename DataType >
optional< typename PropertyType< DataType >::Traits::ReturnType > getOptionalAbstractProperty (AbstractPropertyType abstractPropertyType) const
 
template<typename DataType >
optional< typename PropertyType< DataType >::Traits::ReturnType > getOptionalProperty (const PropertyType< DataType > &propertyType) const
 Evaluates the property value in the same way as the overload above but does not default to the value in property metadata if there are no inputs to the property value. More...
 
template<typename DataType >
optional< typename PropertyType< DataType >::Traits::ReturnType > getOptionalPropertyBase (const PropertyType< DataType > &propertyType) const
 Returns the current value of a property disregarding modifiers, but does not default to the value in property metadata if there are no inputs to the property value. More...
 
template<typename DataType >
PropertyType< DataType >::Traits::ReturnType getProperty (const PropertyType< DataType > &propertyType) const
 Returns the current value of a property type. More...
 
template<typename DataType >
PropertyType< DataType >::Traits::ReturnType getPropertyBase (const PropertyType< DataType > &propertyType) const
 Returns the current value of a property disregarding modifiers. More...
 
template<typename DataType >
size_t getPropertyNotificationHandlerCount (const PropertyType< DataType > &propertyType) const
 Gets number of current notification handlers for given property type. More...
 
bool hasBaseValue (AbstractPropertyType propertyType) const
 Evaluates whether there are any inputs into the property value, disregarding modifiers. More...
 
bool hasLocalValue (AbstractPropertyType propertyType) const
 Evaluates whether there is a local value set for the property. More...
 
bool hasNonClassValue (AbstractPropertyType propertyType) const
 Evaluates whether there is a value of any precedence higher than class default value set for the property. More...
 
bool hasValue (AbstractPropertyType propertyType) const
 Evaluates whether there are any inputs into the property value. More...
 
bool isPropertyFlagSet (AbstractPropertyType propertyType, uint32_t flag) const
 
virtual void onPropertyChanged (AbstractPropertyType propertyType, PropertyNotificationReason reason)
 Virtual function to handle property change notifications. More...
 
 PropertyObject ()
 
void removeKzbProperties ()
 
template<typename DataType >
void removeLocalPropertyValueSource (const PropertyType< DataType > &propertyType, typename PropertyType< DataType >::Descriptor::TypedValueSource *valueSource, void *ownerPointer)
 
void removeLocalValue (AbstractPropertyType propertyType)
 Removes the local value associated with the property. More...
 
template<typename DataType >
void removePropertyModifier (const PropertyType< DataType > &propertyType, typename PropertyType< DataType >::Descriptor::ModifierCallback callback, void *owner)
 
template<typename DataType >
void removePropertyNotificationHandler (const PropertyType< DataType > &propertyType, typename PropertyType< DataType >::Descriptor::NotificationCallback callback, void *owner)
 
template<typename DataType >
void removePropertyValueSource (const PropertyType< DataType > &propertyType, typename PropertyType< DataType >::Descriptor::TypedValueSource *valueSource, void *ownerPointer)
 
template<typename DataType >
void setAbstractProperty (AbstractPropertyType abstractPropertyType, typename PropertyType< DataType >::Traits::ParameterType value)
 
template<typename DataType >
void setProperty (const PropertyType< DataType > &propertyType, typename PropertyType< DataType >::Traits::ParameterType value)
 Sets the local value of a property type. More...
 
void setPropertyFlag (AbstractPropertyType propertyType, uint32_t flag)
 
void validatePropertyModifiers (AbstractPropertyType propertyType)
 
virtual ~PropertyObject ()
 

Static Public Member Functions

static PropertyTypeEditorInfoSharedPtr makeEditorInfo ()
 
- Static Public Member Functions inherited from kanzi::Object
static const MetaclassgetStaticMetaclass ()
 Returns the metaclass of Object class. More...
 
static PropertyTypeEditorInfoSharedPtr makeEditorInfo ()
 Default implementation that returns empty editor info. More...
 
- Static Public Member Functions inherited from kanzi::MetaObject
static const MetaclassgetStaticMetaclass ()
 Returns the metaclass of Object class. More...
 
static PropertyTypeEditorInfoSharedPtr makeEditorInfo ()
 Default implementation that returns empty editor info. More...
 

Protected Types

typedef vector< ModifiedSubscriptionSharedPtrModifiedSubscriptionContainer
 Container for subscriptions. More...
 
typedef shared_ptr< ModifiedSubscriptionModifiedSubscriptionSharedPtr
 Subscription shared pointer type. More...
 
- Protected Types inherited from kanzi::Object
typedef vector< AppliedStyleEntrySharedPtrAppliedStyleContainer
 Applied style container. More...
 

Protected Member Functions

 DataContext (Domain *domain, string_view name)
 Protected standard constructor. More...
 
- Protected Member Functions inherited from kanzi::Resource
virtual unsigned int getCPUMemoryUsageOverride () const
 
virtual void reloadFromFileOverride (string_view filePath)
 
virtual void reloadFromKzbOverride (KzbFile &kzbFile, ReadOnlyMemoryFile &file, KzbMemoryParser &parser)
 
virtual void reloadOverride ()
 
- Protected Member Functions inherited from kanzi::Object
void initialize ()
 
void onCopy (const Object &other)
 
- Protected Member Functions inherited from kanzi::MetaObject
void initialize ()
 
 MetaObject ()
 
- Protected Member Functions inherited from kanzi::PropertyObject
AbstractPropertyTypeDescriptor::ValueSourceEntryacquireLocalValueSourceEntry (AbstractPropertyTypeDescriptor &descriptor, PropertyStoragePtr &propertyStorage)
 Acquires a local value source entry that is free for the assignment of a value. More...
 
AbstractPropertyTypeDescriptor::ModifierStorageacquireModifierStorage (AbstractPropertyTypeDescriptor &descriptor, AbstractPropertyTypeDescriptor::PropertyStorage &propertyStorage)
 
AbstractPropertyTypeDescriptor::NotificationStorageacquireNotificationStorage (AbstractPropertyTypeDescriptor &descriptor)
 
PropertyStoragePtr acquirePropertyStorage (AbstractPropertyTypeDescriptor &descriptor)
 
void addPropertyValueSource (AbstractPropertyTypeDescriptor &descriptor, AbstractPropertyTypeDescriptor::ValueSource *valueSource, PropertyValuePrecedence precedence, void *ownerPointer)
 Internally adds a property value source. More...
 
void addPropertyValueSource (AbstractPropertyTypeDescriptor &descriptor, AbstractPropertyTypeDescriptor::ValueSource *valueSource, PropertyValuePrecedence precedence, AbstractPropertyTypeDescriptor::ValueSourceOwner *owner)
 Internally adds a property value source. More...
 
AbstractPropertyTypeDescriptor::ValueSourceEntryconstructLocalValueSourceEntry (AbstractPropertyTypeDescriptor &descriptor, AbstractPropertyTypeDescriptor::PropertyStorage &propertyStorage)
 
PropertyStoragePtr constructPropertyStorage (AbstractPropertyTypeDescriptor &descriptor)
 
void copyLocalValue (const AbstractPropertyTypeDescriptor::PropertyStorage &otherPropertyStorage)
 Copy local value from property storage. More...
 
AbstractPropertyTypeDescriptor::ModifierStoragefindModifierStorage (AbstractPropertyTypeDescriptor &descriptor)
 
AbstractPropertyTypeDescriptor::NotificationStoragefindNotificationStorage (AbstractPropertyTypeDescriptor &descriptor) const
 
AbstractPropertyTypeDescriptor::PropertyStoragefindPropertyStorage (AbstractPropertyTypeDescriptor &descriptor) const
 Gets the property storage for given property type descriptor. More...
 
PropertyStoragePtr findPropertyStoragePtr (AbstractPropertyTypeDescriptor &descriptor) const
 Gets property storage intrusive pointer which you can use to hold a reference until the end of the operation. More...
 
AbstractPropertyTypeDescriptorfindPropertyTypeDescriptorByNameAndDataType (string_view name, PropertyDataType dataType) const
 Finds a property type descriptor by name and data type. More...
 
AbstractPropertyTypeDescriptorfindPropertyTypeDescriptorByQualifiedNameAndDataType (string_view qualifiedName, PropertyDataType dataType) const
 Like findPropertyTypeDescriptorByNameAndDataType, but only searches by matching with qualified names. More...
 
AbstractPropertyTypeDescriptorfindPropertyTypeDescriptorByUnqualifiedNameAndDataType (string_view unqualifiedName, PropertyDataType dataType) const
 Like findPropertyTypeDescriptorByNameAndDataType, but only searches by matching with unqualified names. More...
 
AbstractPropertyTypeDescriptor::ValueSourcegetClassValueSource (AbstractPropertyTypeDescriptor &descriptor) const
 
AbstractPropertyTypeDescriptor::ValueSourcegetFinalValueSource (AbstractPropertyTypeDescriptor &descriptor) const
 
AbstractPropertyTypeDescriptor::ValueSourcegetNonClassValueSource (AbstractPropertyTypeDescriptor &descriptor) const
 
AbstractPropertyTypeDescriptor::ValueSourcegetTopValueSource (AbstractPropertyTypeDescriptor &descriptor) const
 Gets the top-level value source for a given property descriptor. More...
 
virtual void notifyPropertyHandlers (PropertyStoragePtr &propertyStorage, PropertyNotificationReason reason)
 
void onCopy (const PropertyObject &other)
 
void removeLocalValue (AbstractPropertyTypeDescriptor &descriptor, PropertyStoragePtr &propertyStorage)
 Removes a local value from the given property storage. More...
 
void removePropertyValueSource (AbstractPropertyTypeDescriptor &descriptor, AbstractPropertyTypeDescriptor::ValueSource *valueSource, void *owner)
 Removes a property value source. More...
 
void validatePropertyModifiersAndNotifyHandlers (PropertyStoragePtr &propertyStorage)
 

Protected Attributes

unsigned int m_notificationPassGuard
 Notification pass guard integer for triggering removal at end. More...
 
ModifiedSubscriptionContainer m_subscriptions
 Subscriptions to data context being modified. More...
 
- Protected Attributes inherited from kanzi::Object
AppliedStyleContainer m_appliedStyles
 Listing of applied styles applied to this object. More...
 

Properties

static PropertyType< ResourceSharedPtrDataContextProperty
 DataContext property. More...
 
static PropertyType< ResourceSharedPtrItemsSourceProperty
 ItemsSource property. More...
 
static ResourceSharedPtr getDataContext (const Node &node)
 Gets the value of DataContextProperty. More...
 
static void setDataContext (Node &node, ResourceSharedPtr value)
 Sets the value of DataContextProperty. More...
 
static ResourceSharedPtr getItemsSource (const Node &node)
 Gets the value of ItemsSourceProperty. More...
 
static void setItemsSource (Node &node, ResourceSharedPtr value)
 Sets the value of ItemsSourceProperty. More...
 

Detailed Description

DataContext acts as a container for data.

All data within the data context is described as a tree of data objects. The class provides access and look-up functionality of the contained data objects.

Member Typedef Documentation

◆ ModifiedFunction

typedef function<void()> kanzi::DataContext::ModifiedFunction

Callback function type for change subscriptions.

◆ ModifiedSubscriptionToken

Token type that can be used to identify the change subscription.

◆ ModifiedSubscriptionSharedPtr

Subscription shared pointer type.

◆ ModifiedSubscriptionContainer

Container for subscriptions.

Constructor & Destructor Documentation

◆ DataContext()

kanzi::DataContext::DataContext ( Domain domain,
string_view  name 
)
explicitprotected

Protected standard constructor.

Parameters
domainThe UI domain.
nameName of the data context.

Member Function Documentation

◆ getDataContext()

static ResourceSharedPtr kanzi::DataContext::getDataContext ( const Node node)
inlinestatic

Gets the value of DataContextProperty.

See also
setDataContext()

◆ setDataContext()

static void kanzi::DataContext::setDataContext ( Node node,
ResourceSharedPtr  value 
)
inlinestatic

Sets the value of DataContextProperty.

See also
getDataContext()

◆ getItemsSource()

static ResourceSharedPtr kanzi::DataContext::getItemsSource ( const Node node)
inlinestatic

Gets the value of ItemsSourceProperty.

See also
setItemsSource()

◆ setItemsSource()

static void kanzi::DataContext::setItemsSource ( Node node,
ResourceSharedPtr  value 
)
inlinestatic

Sets the value of ItemsSourceProperty.

See also
getItemsSource()

◆ makeEditorInfo()

static PropertyTypeEditorInfoSharedPtr kanzi::DataContext::makeEditorInfo ( )
static

◆ addModifiedNotificationHandler()

ModifiedSubscriptionToken kanzi::DataContext::addModifiedNotificationHandler ( ModifiedFunction  callback)

Allows to subscribe to modifications in this data context.

Parameters
callbackCallback that is invoked when a change occurs in this data context.
Returns
Token that can be used to identify and remove given subscription.

◆ removeModifiedNotificationHandler()

void kanzi::DataContext::removeModifiedNotificationHandler ( ModifiedSubscriptionToken  token)

Allows to unsubscribe from modifications in this data context.

Parameters
tokenToken to identify the subscription that should be removed.

◆ notifyModified()

void kanzi::DataContext::notifyModified ( )

Triggers modification procedure in this data context, which invokes the subscriptions.

Should be called by derived classes whenever the value of the object is changed.

◆ getData()

virtual DataObjectSharedPtr kanzi::DataContext::getData ( )
pure virtual

Retrieves the root object of the underlying data tree.

Needs to be implemented by the derived class.

Returns
Returns data object that is the root of the data tree.

Implemented in kanzi::DataObject, and kanzi::DataSource.

◆ lookupDataContextOfType()

template<typename Type >
shared_ptr<Type> kanzi::DataContext::lookupDataContextOfType ( string_view  relativePath)
inline

◆ lookupDataContext()

virtual DataContextSharedPtr kanzi::DataContext::lookupDataContext ( string_view  relativePath)
pure virtual

Performs object look-up by path.

Parameters
relativePathPath of the object where to look at, separated by '.'.
Returns
Data object that was found, or empty pointer if there was no such object.

Implemented in kanzi::DataObject, and kanzi::DataSource.

Member Data Documentation

◆ DataContextProperty

PropertyType<ResourceSharedPtr> kanzi::DataContext::DataContextProperty
static

DataContext property.

The default value is ResourceSharedPtr().

See also
setDataContext(), getDataContext()

◆ ItemsSourceProperty

PropertyType<ResourceSharedPtr> kanzi::DataContext::ItemsSourceProperty
static

ItemsSource property.

The default value is ResourceSharedPtr().

See also
setItemsSource(), getItemsSource()

◆ m_subscriptions

ModifiedSubscriptionContainer kanzi::DataContext::m_subscriptions
protected

Subscriptions to data context being modified.

◆ m_notificationPassGuard

unsigned int kanzi::DataContext::m_notificationPassGuard
protected

Notification pass guard integer for triggering removal at end.


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