Struct EventAdapter 

pub struct EventAdapter<T> { /* private fields */ }

Adapts various event value types into an AttributeValue for event attributes.

The html! macro generates EventAdapter::new(expr).into_attribute(event_name) instead of inline trait dispatch boilerplate. This eliminates the per-attribute-site generation of __EventWrapper, __IsClosure, __ClosurePicker, __ValuePicker, __FallbackHelper, and __dispatch types, significantly reducing macro output size.

The adapter pattern handles three cases:

• FnMut(NativeEvent) closure → AttributeValue::Event via NativeEventHandler
• NativeEventHandler directly → AttributeValue::Event as-is
• Option<NativeEventHandler> → AttributeValue::Event or AttributeValue::Text

Implementations

impl<T> EventAdapter<T>

Constructs an EventAdapter that wraps any event-compatible value.

pub fn new(inner: T) -> Self

Creates a new EventAdapter wrapping the given value.

Arguments

• T - The value to wrap for event attribute adaptation.

Returns

• EventAdapter<T> - A new adapter wrapping the value.

impl<F> EventAdapter<F>

where F: FnMut(NativeEvent) + 'static,

Adapts a FnMut(NativeEvent) closure into an AttributeValue::Event.

Wraps the closure into a NativeEventHandler and returns it as an event attribute value. This replaces the __EventWrapper<F> type that was previously generated inline by the html! macro.

pub fn into_attribute(self, event_name: NativeEventName) -> AttributeValue

Converts the wrapped closure into an event AttributeValue.

Arguments

• NativeEventName - The event name enum variant to associate with the handler.

Returns

• AttributeValue - An AttributeValue::Event wrapping the handler.

impl EventAdapter<NativeEventHandler>

Adapts an owned NativeEventHandler into an AttributeValue::Event directly.

When the user already provides a NativeEventHandler, no wrapping is needed; the handler is returned as-is. This replaces the impl __EventWrapper<NativeEventHandler> that was previously generated inline.

pub fn into_attribute(self, _event_name: NativeEventName) -> AttributeValue

Converts the wrapped handler into an event AttributeValue.

Arguments

• NativeEventName - The event name (unused, since the handler already carries it).

Returns

• AttributeValue - An AttributeValue::Event containing the handler.

impl EventAdapter<Option<NativeEventHandler>>

Adapts an Option<NativeEventHandler> into an AttributeValue.

Some(handler) becomes AttributeValue::Event(handler), and None becomes AttributeValue::Text(String::new()). This replaces the impl __EventWrapper<Option<NativeEventHandler>> that was previously generated inline by the html! macro.

pub fn into_attribute(self, _event_name: NativeEventName) -> AttributeValue

Converts the wrapped optional handler into an attribute value.

Arguments

• NativeEventName - The event name (unused when handler is None).

Returns

• AttributeValue - An event attribute if Some, otherwise an empty text attribute.