Enum TabEvent 

pub enum TabEvent {
    Opened(TabId),
    Closed(TabId),
    ActiveChanged {
        previous: Option<TabId>,
        current: Option<TabId>,
    },
    NavStateChanged(TabId),
}

One tab lifecycle or navigation event, carried alongside each TabsSnapshot published to subscribers.

Variants

Opened(TabId)

Closed(TabId)

A BACKGROUND tab closed.

Closing the ACTIVE tab publishes TabEvent::ActiveChanged instead, with previous: Some(id) naming the tab that went — see that variant. One mutation carries exactly one event, because this rides a watch, whose send overwrites: two publishes from inside a single close() would leave the first provably unobservable (nothing can be scheduled between them — close is synchronous and holds the registry’s write lock throughout), so this is a contract to state rather than a second event to emit.

A consumer that needs “which tab closed” for either case reads previous on ActiveChanged and this id here; one that needs to tell a close from a plain switch cannot, and that is the residual — stated here rather than left to be discovered.

ActiveChanged

The active tab changed — by an explicit switch, or because the previously active tab was closed and a neighbor took over (current: None if it was the last tab — the well-defined empty state).

Fields

previous: Option<TabId>

current: Option<TabId>

NavStateChanged(TabId)

Trait Implementations

impl Clone for TabEvent

fn clone(&self) -> Self

Returns a duplicate of the value.

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

Performs copy-assignment from source.

impl Copy for TabEvent

impl Debug for TabEvent

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

Formats the value using the given formatter.

impl Eq for TabEvent

impl PartialEq for TabEvent

fn eq(&self, other: &Self) -> bool

Equality operator ==.

fn ne(&self, other: &Rhs) -> bool

Inequality operator !=.

impl StructuralPartialEq for TabEvent