Trait MutationListener 

pub trait MutationListener<'reference, Element>
where
    Element: Element,
{
    // Required method
    fn update(
        &mut self,
        index: <Element::Label as Label>::Index,
        before: Value<'_>,
        after: Value<'_>,
    );
}

Trait to allow graphs to react to mutation of elements. When an indexed element is updated the mutation listener is called with the index and the before and after values.

Required Methods

fn update( &mut self, index: <Element::Label as Label>::Index, before: Value<'_>, after: Value<'_>, )

Called when a setter is called on a projection of an indexed Element.

Dyn Compatibility

This trait is dyn compatible.

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

Implementations on Foreign Types

impl<Element> MutationListener<'_, Element> for ()

where Element: Element,

fn update( &mut self, _index: <Element::Label as Label>::Index, _before: Value<'_>, _after: Value<'_>, )

Implementors