kanzi::DataSource Class Reference

Use data sources to separate the user interface from the application data and to remove the dependencies between a Kanzi Studio project and the application code which define the Kanzi application. More...

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

Inheritance diagram for kanzi::DataSource:
kanzi::DataContext kanzi::Resource kanzi::Object kanzi::MetaObject kanzi::PropertyObject

Public Member Functions

virtual void loadFromKZB (const ResourceLoaderThreadContext *threadContext, KzcInputStream *inputStream, const KzuBinaryFileInfo *file) KZ_OVERRIDE
 Resource interface. More...
 
virtual DataContextSharedPtr lookupDataContext (string_view relativePath) KZ_OVERRIDE
 DataContext interface. More...
 
virtual DataObjectSharedPtr getData () KZ_OVERRIDE
 Returns no data. More...
 
- Public Member Functions inherited from kanzi::DataContext
ModifiedSubscriptionToken addModifiedNotificationHandler (ModifiedFunction callback)
 Allows to subscribe to modifications in this data context. More...
 
void removeModifiedNotificationHandler (ModifiedSubscriptionToken token)
 Allows to unsubscribe from modifications in this data context. More...
 
void notifyModified ()
 Triggers modification procedure in this data context, which invokes the subscriptions. More...
 
template<typename Type >
shared_ptr< Type > lookupDataContextOfType (string_view relativePath)
 
ResourceSharedPtr getDataContext () const
 Gets the value of DataContextProperty. More...
 
void setDataContext (ResourceSharedPtr value)
 Sets the value of DataContextProperty. More...
 
ResourceSharedPtr getItemsSource () const
 Gets the value of ItemsSourceProperty. More...
 
void setItemsSource (ResourceSharedPtr value)
 Sets the value of ItemsSourceProperty. More...
 
- Public Member Functions inherited from kanzi::Resource
KzcMemoryManagergetMemoryManager () const
 
 Resource (Domain *domain, string_view name)
 
virtual ~Resource ()
 
virtual void unloadOverride ()
 Unload function for resource. Releases all CPU memory taken by the resource except the resource loader. More...
 
virtual unsigned int getCPUMemoryUsage () const
 Function for getting the memory usage of a resource. More...
 
void setKZB (const KzuBinaryDirectory *binaryDirectory, string_view path)
 Set the binary directory and path of the resource. More...
 
const string & getName () const
 Gets the resource name. More...
 
const string & getUrl () const
 Gets the resource URL. More...
 
void setUrl (string_view url)
 Sets the resource URL. More...
 
void setNotLoaded ()
 
bool isFromKZB () const
 
void reload ()
 
void reloadFromKzb (KzcInputStream *inputStream, const KzuBinaryFileInfo *file)
 
void reloadFromKzb (KzbFile &kzbFile, ReadOnlyMemoryFile &file, KzbMemoryParser &parser)
 
void reloadFromFile (string_view filePath)
 
void load ()
 
void unload ()
 
bool isLoaded () const
 
void kzuResourceLoad_private (const ResourceLoaderThreadContext *threadContext)
 Private function for kzuResourceLoad() with specified thread context. More...
 
void kzuResourceFinishLoading_private (const ResourceLoaderThreadContext *threadContext)
 Private function for finishing the loading of the resource. More...
 
bool isKeepAlive () const
 Tells if the resource has keep alive flag set. More...
 
void setKeepAlive (bool keepAlive)
 Sets the keep alive flag. More...
 
- Public Member Functions inherited from kanzi::Object
 Object (Domain *domain)
 
virtual ~Object ()
 
DomaingetDomain () const
 Returns the domain the object belongs to. More...
 
KzuTaskSchedulergetTaskScheduler () const
 Returns the task scheduler of the object. More...
 
KzuMessageDispatchergetMessageDispatcher () const
 Returns the message dispatcher of the object. More...
 
ResourceManagergetResourceManager () const
 Returns the resource manager of the object. More...
 
virtual const MetaclassgetDynamicMetaclass () const KZ_OVERRIDE
 Returns the metaclass of the dynamic type of the object. More...
 
AppliedStyleEntrySharedPtr applyObjectStyle (kanzi::StyleSharedPtr style)
 Applies a style to an object. More...
 
void unapplyObjectStyle (AppliedStyleEntrySharedPtr appliedStyleEntry)
 
void applyObjectStyles ()
 Apply all styles for an object node. More...
 
void unapplyObjectStyles ()
 Unapplies and removes all applied styles. More...
 
- Public Member Functions inherited from kanzi::MetaObject
virtual ~MetaObject ()
 
bool isTypeOf (const Metaclass *objectType) const
 Determines if the type of this object is the given type or derived from it. More...
 
- Public Member Functions inherited from kanzi::PropertyObject
 PropertyObject ()
 
virtual ~PropertyObject ()
 
template<typename DataType >
void setProperty (const PropertyType< DataType > &propertyType, typename PropertyType< DataType >::Traits::ParameterType value)
 Sets the local value of a property. More...
 
void removeKzbProperties ()
 
template<typename DataType >
PropertyType< DataType >::Traits::ReturnType getProperty (const PropertyType< DataType > &propertyType) const
 Returns the current value of a property. More...
 
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 >
PropertyType< DataType >::Traits::ReturnType getPropertyBase (const PropertyType< DataType > &propertyType) const
 Returns the current value of a property disregarding modifiers. More...
 
template<typename DataType >
void setAbstractProperty (AbstractPropertyType abstractPropertyType, typename PropertyType< DataType >::Traits::ParameterType value)
 
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
 
void setPropertyFlag (AbstractPropertyType propertyType, uint32_t flag)
 
bool isPropertyFlagSet (AbstractPropertyType propertyType, uint32_t flag) const
 
void clearPropertyFlag (AbstractPropertyType propertyType, uint32_t flag)
 
bool hasValue (AbstractPropertyType propertyType) const
 Evaluates whether there are any inputs into the property value. 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...
 
void removeLocalValue (AbstractPropertyType propertyType)
 Removes the local value associated with the property. More...
 
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...
 
virtual void onPropertyChanged (AbstractPropertyType propertyType, PropertyNotificationReason reason)
 Virtual function to handle property change notifications. More...
 
template<typename DataType >
void addPropertyValueSource (const PropertyType< DataType > &propertyType, typename PropertyType< DataType >::Descriptor::TypedValueSource *valueSource, PropertyValuePrecedence precedence, void *owner)
 
template<typename DataType >
void removePropertyValueSource (const PropertyType< DataType > &propertyType, typename PropertyType< DataType >::Descriptor::TypedValueSource *valueSource, void *owner)
 
template<typename DataType >
void addPropertyModifier (const PropertyType< DataType > &propertyType, typename PropertyType< DataType >::Descriptor::ModifierCallback callback, void *owner)
 
template<typename DataType >
void removePropertyModifier (const PropertyType< DataType > &propertyType, typename PropertyType< DataType >::Descriptor::ModifierCallback callback, void *owner)
 
void validatePropertyModifiers (AbstractPropertyType propertyType)
 
template<typename DataType >
void addPropertyNotificationHandler (const PropertyType< DataType > &propertyType, typename PropertyType< DataType >::Descriptor::NotificationCallback callback, void *owner)
 
template<typename DataType >
void removePropertyNotificationHandler (const PropertyType< DataType > &propertyType, typename PropertyType< DataType >::Descriptor::NotificationCallback callback, void *owner)
 
template<typename DataType >
size_t getPropertyNotificationHandlerCount (const PropertyType< DataType > &propertyType)
 Gets number of current notification handlers for given property type. More...
 

Static Public Member Functions

static PropertyTypeEditorInfoSharedPtr makeEditorInfo ()
 
static DataSourceSharedPtr loadFromKZB (Domain *domain, string_view name, KzbFile &kzbFile, ReadOnlyMemoryFile &file, KzbMemoryParser &parser)
 Load and create data source from kzb. More...
 
static DataSourceSharedPtr create (Domain *domain, string_view name)
 Creates an empty DataSource. More...
 
- Static Public Member Functions inherited from kanzi::DataContext
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 Member Functions

 DataSource (Domain *domain, string_view name)
 Standard constructor. More...
 
virtual void loadFromKZB (Domain *domain, KzbFile &kzbFile, ReadOnlyMemoryFile &file, KzbMemoryParser &parser)
 Loads data source from kzb. More...
 
virtual void onLoaded ()
 Override function called after loadFromKZB. More...
 
- Protected Member Functions inherited from kanzi::DataContext
 DataContext (Domain *domain, string_view name)
 Protected standard constructor. More...
 
- Protected Member Functions inherited from kanzi::Resource
virtual void reloadOverride ()
 
virtual void reloadFromKzbOverride (KzcInputStream *inputStream, const KzuBinaryFileInfo *file)
 
virtual void reloadFromKzbOverride (KzbFile &kzbFile, ReadOnlyMemoryFile &file, KzbMemoryParser &parser)
 
virtual void reloadFromFileOverride (string_view filePath)
 
virtual unsigned int getCPUMemoryUsageOverride () const
 
- Protected Member Functions inherited from kanzi::Object
void initialize ()
 
void onCopy (const Object &other)
 
- Protected Member Functions inherited from kanzi::MetaObject
 MetaObject ()
 
void initialize ()
 
- Protected Member Functions inherited from kanzi::PropertyObject
void addPropertyValueSource (AbstractPropertyTypeDescriptor &descriptor, AbstractPropertyTypeDescriptor::ValueSource *valueSource, PropertyValuePrecedence precedence, void *owner)
 
void removePropertyValueSource (AbstractPropertyTypeDescriptor &descriptor, AbstractPropertyTypeDescriptor::ValueSource *valueSource, void *owner)
 
AbstractPropertyTypeDescriptor::ValueSourceEntrygetTopValueSourceEntry (AbstractPropertyTypeDescriptor::PropertyStorage &propertyStorage) const
 
AbstractPropertyTypeDescriptor::ValueSourceEntrygetTopValueSourceEntry (AbstractPropertyTypeDescriptor &descriptor) const
 
AbstractPropertyTypeDescriptor::ValueSourcegetTopValueSource (AbstractPropertyTypeDescriptor &descriptor) const
 
AbstractPropertyTypeDescriptor::ValueSourcegetFinalValueSource (AbstractPropertyTypeDescriptor &descriptor) const
 
AbstractPropertyTypeDescriptor::ValueSourcegetNonClassValueSource (AbstractPropertyTypeDescriptor &descriptor) const
 
AbstractPropertyTypeDescriptor::ValueSourcegetClassValueSource (AbstractPropertyTypeDescriptor &descriptor) const
 
AbstractPropertyTypeDescriptor::ValueSourceEntryfindLocalValueSourceEntry (AbstractPropertyTypeDescriptor::PropertyStorage &propertyStorage)
 
AbstractPropertyTypeDescriptor::ValueSourceEntryconstructLocalValueSourceEntry (AbstractPropertyTypeDescriptor &descriptor, AbstractPropertyTypeDescriptor::PropertyStorage &propertyStorage)
 
AbstractPropertyTypeDescriptor::ValueSourceEntryacquireLocalValueSourceEntry (AbstractPropertyTypeDescriptor &descriptor, PropertyStoragePtr &propertyStorage)
 
AbstractPropertyTypeDescriptor::PropertyStoragefindPropertyStorage (AbstractPropertyTypeDescriptor &descriptor) const
 
PropertyStoragePtr findPropertyStoragePtr (AbstractPropertyTypeDescriptor &descriptor) const
 Gets property storage intrusive pointer that can be used to hold a reference until end of operation. More...
 
PropertyStoragePtr constructPropertyStorage (AbstractPropertyTypeDescriptor &descriptor)
 
PropertyStoragePtr acquirePropertyStorage (AbstractPropertyTypeDescriptor &descriptor)
 
AbstractPropertyTypeDescriptor::ModifierStorageacquireModifierStorage (AbstractPropertyTypeDescriptor &descriptor, AbstractPropertyTypeDescriptor::PropertyStorage &propertyStorage)
 
AbstractPropertyTypeDescriptor::ModifierStoragefindModifierStorage (AbstractPropertyTypeDescriptor &descriptor)
 
AbstractPropertyTypeDescriptor::NotificationStorageacquireNotificationStorage (AbstractPropertyTypeDescriptor &descriptor)
 
AbstractPropertyTypeDescriptor::NotificationStoragefindNotificationStorage (AbstractPropertyTypeDescriptor &descriptor)
 
AbstractPropertyTypeDescriptorfindPropertyTypeDescriptorByUnqualifiedNameAndDataType (string_view unqualifiedName, PropertyDataType dataType)
 
void validatePropertyModifiersAndNotifyHandlers (PropertyStoragePtr &propertyStorage)
 
void copyLocalValue (const AbstractPropertyTypeDescriptor::PropertyStorage &otherPropertyStorage)
 Copy local value from property storage. More...
 
PropertyStorageContainer::iterator beginPropertyStorage ()
 
PropertyStorageContainer::iterator endPropertyStorage ()
 
virtual void notifyPropertyHandlers (PropertyStoragePtr &propertyStorage, PropertyNotificationReason reason)
 
void onCopy (const PropertyObject &other)
 

Additional Inherited Members

- Public Types inherited from kanzi::DataContext
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 intrusive_ptr< AbstractPropertyTypeDescriptor::PropertyStoragePropertyStoragePtr
 
typedef vector< PropertyStoragePtrPropertyStorageContainer
 
typedef PropertyStorageContainer::iterator PropertyStorageIterator
 
typedef PropertyStorageContainer::const_iterator PropertyStorageConstIterator
 
typedef PropertyStorageContainer::reverse_iterator PropertyStorageReverseIterator
 
- Static Public Attributes inherited from kanzi::DataContext
static PropertyType< ResourceSharedPtrDataContextProperty
 DataContext property. More...
 
static PropertyType< ResourceSharedPtrItemsSourceProperty
 ItemsSource property. More...
 
- Protected Types inherited from kanzi::DataContext
typedef shared_ptr< ModifiedSubscriptionModifiedSubscriptionSharedPtr
 Subscription shared pointer type. More...
 
typedef vector< ModifiedSubscriptionSharedPtrModifiedSubscriptionContainer
 Container for subscriptions. More...
 
- Protected Types inherited from kanzi::Object
typedef vector< AppliedStyleEntrySharedPtrAppliedStyleContainer
 Applied style container. More...
 
- Protected Attributes inherited from kanzi::DataContext
ModifiedSubscriptionContainer m_subscriptions
 Subscriptions to data context being modified. More...
 
unsigned int m_notificationPassGuard
 Notification pass guard integer for triggering removal at end. More...
 
- Protected Attributes inherited from kanzi::Object
AppliedStyleContainer m_appliedStyles
 Listing of applied styles applied to this object. More...
 

Detailed Description

Use data sources to separate the user interface from the application data and to remove the dependencies between a Kanzi Studio project and the application code which define the Kanzi application.

Kanzi allows you to define the format and structure of your data source by defining a Kanzi Engine data source plugin.

When you use a data source in a Kanzi application you bind the values of properties and property fields to data that comes from a data source. This binding establishes a connection between a node or a resource and the application data. When data in the data source changes, the nodes and resources which are bound to the data reflect the change in the data.

To set a node to use a data source, use the DataContext::DataContext property. When you set the Data Context property for a node, all its child nodes inherit the value of the Data Context property. After you set a node to use a data source, you can use bindings to access the data. See Binding::createFromDataObjectPath.

Set the value of the DataContext::DataContext property to one of these:

  • Uri that defines the resource.
  • Resource ID that defines the resource in a resource dictionary.
  • Path that allows to navigate further within the current data context. For example:
    $.car.cluster
    

The format of a data context binding is:

{DataContext.path.to.data}

For example:

{DataContext.car.cluster.speed}

Data context bindings support all standard Kanzi binding features, such as expressions.

Constructor & Destructor Documentation

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

Standard constructor.

Parameters
domainThe UI domain the new resource belongs to.
nameName of the data source.

Member Function Documentation

static PropertyTypeEditorInfoSharedPtr kanzi::DataSource::makeEditorInfo ( )
static
virtual void kanzi::DataSource::loadFromKZB ( const ResourceLoaderThreadContext threadContext,
KzcInputStream inputStream,
const KzuBinaryFileInfo file 
)
virtual

Resource interface.

Reimplemented from kanzi::Resource.

virtual DataContextSharedPtr kanzi::DataSource::lookupDataContext ( string_view  relativePath)
virtual

DataContext interface.

Implements kanzi::DataContext.

static DataSourceSharedPtr kanzi::DataSource::loadFromKZB ( Domain domain,
string_view  name,
KzbFile kzbFile,
ReadOnlyMemoryFile file,
KzbMemoryParser parser 
)
static

Load and create data source from kzb.

Parameters
domainDomain
nameData source name.
kzbFileKZB file where to load from.
fileData source file inside KZB file where to load from.
parserFile memory parser.
Returns
Loaded data source.
static DataSourceSharedPtr kanzi::DataSource::create ( Domain domain,
string_view  name 
)
inlinestatic

Creates an empty DataSource.

virtual DataObjectSharedPtr kanzi::DataSource::getData ( )
inlinevirtual

Returns no data.

Implements kanzi::DataContext.

virtual void kanzi::DataSource::loadFromKZB ( Domain domain,
KzbFile kzbFile,
ReadOnlyMemoryFile file,
KzbMemoryParser parser 
)
protectedvirtual

Loads data source from kzb.

Parameters
domainDomain
kzbFileKZB file where to load from.
fileBrush file inside KZB file where to load from.
parserFile memory parser.
virtual void kanzi::DataSource::onLoaded ( )
inlineprotectedvirtual

Override function called after loadFromKZB.


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