Struct VisualAncestorElementNode 

pub struct VisualAncestorElementNode { /* private fields */ }

A node that locates an ancestor of its source element in the visual tree (relative source “find ancestor” in the visual tree), following the element’s attachment to the tree.

Implementations

impl VisualAncestorElementNode

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

Trait Implementations

impl ExpressionNode for VisualAncestorElementNode

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 VisualAncestorElementNode

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