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ExpressionNode

ferroui_base::data::core::expression_nodes

Trait ExpressionNode 

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pub trait ExpressionNode: Any {
    // Required methods
    fn state(&self) -> &NodeState;
    fn on_source_changed(
        &self,
        source: Option<&BoxedValue>,
        data_validation_error: Option<&BindingError>,
    );

    // Provided methods
    fn build_string(&self, _builder: &mut String) { ... }
    fn build_string_with_nodes(
        &self,
        builder: &mut String,
        nodes: &[Rc<dyn ExpressionNode>],
    ) { ... }
    fn unsubscribe(&self, _old_source: &BoxedValue) { ... }
    fn as_settable(&self) -> Option<&dyn ISettableNode> { ... }
    fn as_property_accessor_node(&self) -> Option<&dyn IPropertyAccessorNode> { ... }
    fn as_source_node(&self) -> Option<&dyn SourceNode> { ... }
    fn is_data_context_node(&self) -> bool { ... }
}
Expand description

A node in a binding path: reads a value from its source and passes it to the next node (or, for the last node, to the binding expression).

Required Methods§

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fn state(&self) -> &NodeState

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

Subscribes to the new source and updates the current value.

Provided Methods§

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

Appends a string representation of the node to builder.

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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.

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fn unsubscribe(&self, _old_source: &BoxedValue)

Unsubscribes from the previous source.

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

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

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

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fn is_data_context_node(&self) -> bool

Whether the node reads a data context.

Implementations§

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impl dyn ExpressionNode

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pub fn set_owner(&self, owner: Weak<BindingExpression>, index: usize)

Sets the owner binding. Panics if the node already has an owner.

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pub fn set_source( &self, source: NodeSource, data_validation_error: Option<&BindingError>, )

Sets the source from which the node reads its value and updates the current value, notifying the owner if the value changes.

Dyn Compatibility§

This trait is dyn compatible.

In older versions of Rust, dyn compatibility was called "object safety".

Implementors§