HarborFleetObserver class abstract

Hears harbors join and leave a HarborFleet, as a NavigatorObserver hears routes come and go.

Register one with HarborSea(observers:), or with HarborFleet.addObserver on a fleet you already have (Harbor.of(context).fleet). Both methods do nothing unless overridden.

A harbor joins as it is first built, in the middle of a frame, so both events are delivered after that frame, in the order they happened: by then a harbor that joined has laid out, and HarborChart.nearest or HarborChart.snapshotOf(harbor.fleet) can read where it is. A harbor that joins and leaves within one frame is reported to nobody. Harbors already in the fleet when an observer is added are not replayed: read HarborFleet.harbors for those.

See also:

• NavigatorObserver, the model for this one.
• HarborChart.snapshotAll, every live harbor of every sea at once.

Constructors

HarborFleetObserver()

Const so that subclasses can be const.

const

Properties

hashCode → int

The hash code for this object.

no setter, inherited

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

Methods

didJoin(HarborController harbor) → void

harbor has joined the fleet: a page, a sheet, a dialog or a harbor inside one has been built.

didLeave(HarborController harbor) → void

harbor has left the fleet: it was removed from the tree. Its handle no longer changes anything.

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

toString() → String

A string representation of this object.

inherited

Operators

operator ==(Object other) → bool

The equality operator.

inherited