Struct LogicalAncestorElementNode 

pub struct LogicalAncestorElementNode { /* private fields */ }

A node that locates an ancestor of its source element in the logical tree ($parent, $parent[Type, level]), following the element’s attachment to the tree.

Implementations

impl LogicalAncestorElementNode

pub fn new( ancestor_type: Option<&'static TypeInfo>, ancestor_level: usize, ) -> Rc<Self>

Trait Implementations

impl ExpressionNode for LogicalAncestorElementNode

fn state(&self) -> &NodeState

fn build_string(&self, builder: &mut String)

Appends a string representation of the node to builder.

fn on_source_changed( &self, source: Option<&BoxedValue>, _data_validation_error: Option<&BindingError>, )

Subscribes to the new source and updates the current value.

fn unsubscribe(&self, _old_source: &BoxedValue)

Unsubscribes from the previous source.

fn as_source_node(&self) -> Option<&dyn SourceNode>

fn build_string_with_nodes( &self, builder: &mut String, nodes: &[Rc<dyn ExpressionNode>], )

Builds a string representation of the binding path up to this node.

fn as_settable(&self) -> Option<&dyn ISettableNode>

fn as_property_accessor_node(&self) -> Option<&dyn IPropertyAccessorNode>

fn is_data_context_node(&self) -> bool

Whether the node reads a data context.

impl SourceNode for LogicalAncestorElementNode

fn select_source( &self, source: Option<&Option<BoxedValue>>, target: &Ref<FerroObject>, anchor: Option<&Ref<FerroObject>>, ) -> Option<BoxedValue>

Selects the source for the binding expression based on the binding source (None when no source was given), target and anchor.

fn should_log_errors(&self, _state: &NodeState, target: &FerroObject) -> bool