Struct DataTrigger

pub struct DataTrigger(/* private fields */);

Use a DataTrigger to apply an action to either set a property value of a target node or activate an Activity node. A DataTrigger keeps that action applied for as long as the condition in that DataTrigger is met. When the condition in that DataTrigger is no longer met, Kanzi reverts the changes that it applied using that DataTrigger. Note that in a DataTrigger you can use only ApplyAction actions: ApplyActivationAction and ApplyPropertyAction.

You set the condition in a DataTrigger in the form of a binding expression that evaluates to either true or false. In the condition you can use as an input either a property or a data source.

For example, you can use a DataTrigger to control the logic and activation state of Activity nodes in Activity Host nodes using ApplyAction actions.

ApplyAction actions of a DataTrigger have higher priority than the actions of any other Trigger. For example, if you use a DataTrigger with an ApplyPropertyAction that sets the DataDrivenExclusiveActivityHostConcept::ActiveActivityIndexProperty to some value and any other Trigger with a SetPropertyAction that sets that same property to a different value, the effect of the SetPropertyAction becomes visible only after Kanzi unapplies the ApplyPropertyAction.

Examples

To use a DataTrigger to control the activation of an Activity node with an ApplyActivationAction:

To use a DataTrigger to set the value of a property with an ApplyPropertyAction when a condition in a DataTrigger is met:

Implementations

impl DataTrigger

pub fn create( domain: &Domain, name: impl AsRef<KanziStr>, ) -> Result<DataTrigger, Error>

Constructor.

Arguments

• domain - The UI domain the new trigger belongs to.
• name - The name of the trigger.

Methods from Deref<Target = DataTriggerComponent>

pub fn get_condition_expression(&self) -> Result<KanziString, Error>

See: CONDITION_EXPRESSION_PROPERTY

pub fn set_condition_expression( &self, value: impl AsRef<KanziStr>, ) -> Result<(), Error>

See: CONDITION_EXPRESSION_PROPERTY

Methods from Deref<Target = NodeComponent>

pub fn get_name(&self) -> Result<KanziString, Error>

See: NAME_PROPERTY

pub fn set_name(&self, value: impl AsRef<KanziStr>) -> Result<(), Error>

See: NAME_PROPERTY

pub fn get_node(&self) -> Result<Option<Weak<Node>>, Error>

Returns the node the node component is attached to or None if node component is not attached to a node.

pub fn get_state(&self) -> Result<NodeComponentState, Error>

Gets the state of node component indicating if component is attached to a node, detached from any node or in process of attaching/detaching.

Methods from Deref<Target = Object>

pub fn as_ptr(&self) -> *mut ObjectWrapper

pub fn as_wrapper(&self) -> &ObjectWrapper

pub fn as_object(&self) -> &Object

Represents any type inheriting from Object as &Object. This is useful for comparisions when PartialEq traits failed to compare objects of different types.

let child = screen.get_child(0)?;
let parent = child.get_parent()?.into_error(ErrorKind::ObjectNotFound)?;
// assert_eq!(screen, parent); // <- Fails to compile!
assert_eq!(screen.as_object(), parent.as_object());

pub fn get_native(&self) -> Result<NonNull<c_void>, Error>

Gets a pointer to the backing C++ instance.

pub fn is_stale(&self) -> bool

Checks whether the weak reference has expired.

pub fn get_property<T>( &self, property_type: &PropertyType<T>, ) -> Result<<T as VariantConstraint>::RetArg, Error>

where T: PropertyTypeConstraint,

Returns the current value of a property disregarding modifiers.

Base value is affected by the following inputs where the highest entry in the list determines the base value:

1. Local value set with setProperty or loaded from kzb
2. Value set by a style affecting the property.
3. Value defined by class metadata.

Modifiers are not applied, the highest-priority base value is returned.

If no inputs to the property value can be established the system returns the value default value from property type metadata.

Arguments

• property_type - The property type identifying the property to retrieve.

Returns

The evaluated property value.

pub fn get_optional_property<T>( &self, property_type: &PropertyType<T>, ) -> Result<Option<<T as VariantConstraint>::RetArg>, Error>

where T: PropertyTypeConstraint,

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.

If there is no value sources, None is returned.

If no inputs to the property value can be established the system returns the value default value from property type metadata.

Arguments

• property_type - The property type identifying the property to retrieve.

Returns

The evaluated property value.

pub fn set_property<T>( &self, property_type: &PropertyType<T>, value: <T as VariantConstraint>::DataArg<'_>, ) -> Result<(), Error>

where T: PropertyTypeConstraint,

Sets the local value of a property type.

pub fn has_value<T>( &self, property_type: &PropertyType<T>, ) -> Result<bool, Error>

where T: PropertyTypeConstraint,

Evaluates whether there are any inputs into the property value. Both value sources and modifiers are taken into account.

Returns

Returns true if there are inputs into the property value, false otherwise.

pub fn remove_local_value<T>( &self, property_type: &PropertyType<T>, ) -> Result<(), Error>

where T: PropertyTypeConstraint,

Removes the local value associated with the property.

pub fn get_metaclass(&self) -> Result<Metaclass, Error>

Returns the metaclass of the dynamic type of the object.

pub fn get_domain(&self) -> Result<Domain, Error>

Returns the domain the object belongs to.

pub fn set_flag_keep_during_patching<T>( &self, property_type: &PropertyType<T>, ) -> Result<(), Error>

where T: PropertyTypeConstraint,

Sets the flag to indicate that the property was loaded from KZB.

pub fn debug_string(&self) -> Result<String, Error>

Builds a string representation of the object intended for debugging purposes.

Trait Implementations

impl Clone for DataTrigger

fn clone(&self) -> DataTrigger

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl ConcreteObjectConstraint for DataTrigger

fn create_instance( domain: &Domain, name: impl AsRef<KanziStr>, ) -> Result<Self, Error>

impl Debug for DataTrigger

fn fmt(&self, f: &mut Formatter<'_>) -> Result<(), Error>

Formats the value using the given formatter.

impl Deref for DataTrigger

type Target = DataTriggerComponent

The resulting type after dereferencing.

fn deref(&self) -> &<DataTrigger as Deref>::Target

Dereferences the value.

impl Inheritable for DataTrigger

unsafe fn downcast_unchecked<T>(self) -> T

where T: Inherits<Self>,

Downcast the object to a more specific type.

unsafe fn downcast_unchecked_ref<T>(&self) -> &T

where T: Inherits<Self>,

Downcast the object reference to a more specific type.

impl Inherits<DataTriggerComponent> for DataTrigger

fn upcast(self) -> Base

fn upcast_ref(&self) -> &Base

impl Inherits<NodeComponent> for DataTrigger

fn upcast(self) -> Base

fn upcast_ref(&self) -> &Base

impl Inherits<Object> for DataTrigger

fn upcast(self) -> Base

fn upcast_ref(&self) -> &Base

impl MetaclassConstraint for DataTrigger

fn get_static_metaclass() -> &'static Metaclass

Gets metaclass associated with a given type.

impl ObjectConstraint for DataTrigger

fn downcast<T>(self) -> Result<Option<T>, Error>

where T: MetaInherits<Self>,

Casts metaclass to a more specific type by value.

fn downcast_ref<T>(&self) -> Result<Option<&T>, Error>

where T: MetaInherits<Self>,

Casts metaclass to a more specific type by reference.

fn is_a<T>(&self) -> Result<bool, Error>

where T: MetaInherits<Self>,

Determines whether the class this metaclass describes derives from a class described by specified metaclass.

fn downgrade(self) -> Weak<Self>

fn downgrade_ref(&self) -> Weak<Self>

fn lock(self) -> ThreadObject<Self>

fn lock_ref(&self) -> ThreadObject<Self>

impl<T> PartialEq<T> for DataTrigger

where T: ObjectConstraint,

fn eq(&self, rhs: &T) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl<T> PartialEq<Weak<T>> for DataTrigger

where T: ObjectConstraint,

fn eq(&self, rhs: &Weak<T>) -> bool

Tests for self and other values to be equal, and is used by ==.

fn ne(&self, other: &Rhs) -> bool

Tests for !=. The default implementation is almost always sufficient, and should not be overridden without very good reason.

impl Eq for DataTrigger