Struct ApplyPropertyAction

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

An ApplyPropertyAction sets a property to the requested value for as long as the condition is met in the DataTrigger that sets off this action. When the trigger condition is no longer met, Kanzi rolls back the value of that property to the value before the action was applied, or to the value set while Kanzi was applying an ApplyPropertyAction. Use the ApplyPropertyAction only with a DataTrigger.

For example, when the value of a property changes from 5 to 9 while Kanzi is applying an ApplyPropertyAction on that property, when a DataTrigger that set off that action, rolls back that property value, the value is 9, and not 5.

When you want to set a value of a property only when a condition in a Trigger is met, always use a DataTrigger. For example, use one DataTrigger with an ApplyPropertyAction instead of any other trigger to set the value of a property when the condition in that trigger is met and another trigger to roll back the value of the same property when the condition in the first trigger is no longer met.

Since

Kanzi 3.9.0

Examples

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

Implementations

impl ApplyPropertyAction

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

Creates an instance of ApplyPropertyAction.

Arguments

• domain - Pointer to domain.
• name - Name of this action instance.

Returns

Shared pointer to the created ApplyPropertyAction instance.

impl ApplyPropertyAction

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

See: TARGET_PATH_PROPERTY

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

See: TARGET_PATH_PROPERTY

Methods from Deref<Target = ActionBase>

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

Returns the name of the action

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 ApplyPropertyAction

fn clone(&self) -> ApplyPropertyAction

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl ConcreteObjectConstraint for ApplyPropertyAction

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

impl Debug for ApplyPropertyAction

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

Formats the value using the given formatter.

impl Deref for ApplyPropertyAction

type Target = ApplyAction

The resulting type after dereferencing.

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

Dereferences the value.

impl Inheritable for ApplyPropertyAction

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<ActionBase> for ApplyPropertyAction

fn upcast(self) -> Base

fn upcast_ref(&self) -> &Base

impl Inherits<ApplyAction> for ApplyPropertyAction

fn upcast(self) -> Base

fn upcast_ref(&self) -> &Base

impl Inherits<Object> for ApplyPropertyAction

fn upcast(self) -> Base

fn upcast_ref(&self) -> &Base

impl MetaclassConstraint for ApplyPropertyAction

fn get_static_metaclass() -> &'static Metaclass

Gets metaclass associated with a given type.

impl ObjectConstraint for ApplyPropertyAction

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 ApplyPropertyAction

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 ApplyPropertyAction

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 ApplyPropertyAction