Enum bevy_ui_navigation::events::NavEvent

pub enum NavEvent {
    InitiallyFocused(Entity),
    FocusChanged {
        to: NonEmpty<Entity>,
        from: NonEmpty<Entity>,
    },
    NoChanges {
        from: NonEmpty<Entity>,
        request: NavRequest,
    },
    Locked(LockReason),
    Unlocked(LockReason),
}

Events emitted by the navigation system.

Useful if you want to react to NavEvent::NoChanges event, for example when a “start game” button is focused and the NavRequest::Action is pressed.

Variants

InitiallyFocused(Entity)

Tells the app which element is the first one to be focused.

This will be sent whenever the number of focused elements go from 0 to 1. Meaning: whenever you spawn a new UI with Focusable elements.

The order of selection when no Focusable is focused yet is as follow:

• The prioritized Focusable of the root menu
• Any prioritized Focusable
• Any Focusable in the root menu
• Any Focusable

FocusChanged

Fields

to: NonEmpty<Entity>

The list of elements that has become active after the focus change

from: NonEmpty<Entity>

The list of active elements from the focused one to the last active which is affected by the focus change

Focus changed.

Notes

Both to and from are ascending, meaning that the focused and newly focused elements are the first of their respective vectors.

NonEmpty enables you to safely check to.first() or from.first() without returning an option. It is guaranteed that there is at least one element.

NoChanges

Fields

from: NonEmpty<Entity>

The active elements from the focused one to the last active which is affected by the focus change.

request: NavRequest

The NavRequest that didn’t do anything.

The NavRequest didn’t lead to any change in focus.

Locked(LockReason)

The navigation lock has been enabled. Either by a lock focusable or NavRequest::Lock.

Once the navigation plugin enters a locked state, the only way to exit it is to send a NavRequest::Unlock.

Unlocked(LockReason)

The navigation lock has been released.

The navigation system was in a locked state triggered [Entity], is now unlocked, and receiving events again.

Implementations

impl NavEvent

pub fn is_activated(&self, entity: Entity) -> bool

Whether this event is a NavEvent::NoChanges triggered by a NavRequest::Action if entity is the currently focused element.

Trait Implementations

impl Clone for NavEvent

fn clone(&self) -> NavEvent

Returns a copy of the value.

fn clone_from(&mut self, source: &Self)

Performs copy-assignment from source.

impl Debug for NavEvent

fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter.

impl Event for NavEvent

where Self: Send + Sync + 'static,