OmegaFlowExpression class

Message a flow sends to the UI (loading, success, error). The UI listens to OmegaFlow.expressions.

Why use it: The flow announces state; the UI doesn't ask "are you loading?". Use payloadAs for typed reads.

Example: In the flow: emitExpression("success", payload: user); In the UI: exp.payloadAs<User>();

Available extensions

• OmegaFlowExpressionPayloadExtension

Constructors

OmegaFlowExpression(String type, {dynamic payload})

const

Properties

hashCode → int

The hash code for this object.

no setter, inherited

payload → dynamic

Optional data. Use payloadAs to read with type.

final

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

type → String

Type ("loading", "success", "error"). The UI typically does setState based on this value.

final

Methods

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

payloadAs<T>() → T?

Available on OmegaFlowExpression, provided by the OmegaFlowExpressionPayloadExtension extension

Returns payload as T if compatible; otherwise null.

toString() → String

A string representation of this object.

inherited

Operators

operator ==(Object other) → bool

The equality operator.

inherited