Data source binding source. More...

#include <kanzi/core.ui/binding/data_source_binding_source.hpp>

Inheritance diagram for kanzi::DataSourceBindingSource:

Public Member Functions
string	getPath () const
	Gets the source data object path. More...

Public Member Functions inherited from kanzi::BindingSource
BindingSourceRuntimePtr	createRuntime ()
	Creates binding source runtime. More...

virtual	~BindingSource ()
	Destructor. More...

Static Public Member Functions
static BindingSourcePtr	create (string_view path)
	Creates a new data source binding source. More...

Protected Member Functions
BindingSourceRuntimePtr	createRuntimeOverride () override
	BindingSource::createRuntime implementation. More...

	DataSourceBindingSource (string_view path)
	Constructor. More...

Protected Member Functions inherited from kanzi::BindingSource
	BindingSource ()
	Constructor. More...

Protected Attributes
string	m_path
	Path to object to listen to. More...

Detailed Description

Data source binding source.

DataSourceBindingSource specifies a path to a data source in the local effective data source context. When the value specified by the path changes, it is used as the source value for the binding. If the data object specified by the path is not available, DataSourceBindingSource waits for the object to be available and connects when it exists for the local data source context.

Creating a data source binding source

To create a data source binding source:

// Create a data source binding source.

BindingSourcePtr source = DataSourceBindingSource::create("cluster.speed.kmh");

Writing to data sources with bindings

To write to a data source, you can create a two-way binding to a data source.

            BindingSourcePtr source = DataSourceBindingSource::create("cluster.speed.needle.rotationAngle");
            TwoWayBindingSharedPtr binding = TwoWayBinding::create(kanzi::move(source));
            BindingRuntimeHandle runtime = node->setBinding(binding, Node2D::RenderTransformationProperty, PropertyFieldRotationZ);
            // Value in data source now controls the rotation of a 2D node.

Considerations

Data source binding sources can connect and read values only if a data source is available for the location in which they are used. For nodes this means that the DataContext::DataContextProperty is set in the node or in an ascendant of the node.

You can create a data source binding by binding to the DataContext::DataContextProperty of a Node. In this case, a DataObject within the DataContext can serve as the data source for the Node and its descendants. To create a data context binding:

            BindingSourcePtr source = DataSourceBindingSource::create("cluster.speed");
            BindingSharedPtr binding = Binding::create(kanzi::move(source));
            BindingRuntimeHandle runtime = node->setBinding(binding, DataContext::DataContextProperty);
            // Local data context for node is now the DataContext identified by the path "cluster.speed" from the parent data context.

Since: Kanzi 3.7.0

Constructor & Destructor Documentation

kanzi::DataSourceBindingSource::DataSourceBindingSource ( string_view path )

inlineprotected

Constructor.

Parameters

path	Data object path.

Member Function Documentation

static BindingSourcePtr kanzi::DataSourceBindingSource::create ( string_view path )

static

Creates a new data source binding source.

Parameters

path	Data object path.

Returns: The created data source binding source.

string kanzi::DataSourceBindingSource::getPath ( ) const

inline

Gets the source data object path.

Returns: Data object path.

BindingSourceRuntimePtr kanzi::DataSourceBindingSource::createRuntimeOverride ( )

overrideprotectedvirtual

BindingSource::createRuntime implementation.

Implements kanzi::BindingSource.

Member Data Documentation

string kanzi::DataSourceBindingSource::m_path

protected

Path to object to listen to.

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

kanzi/core.ui/binding/data_source_binding_source.hpp

Public Member Functions

Static Public Member Functions

Protected Member Functions