InitialData<D>.run constructor
InitialData<D>.run (
- GetInitialData<
D?> getInitialData
Creates an InitialData that will call the getInitialData
function,
passing the TransitionContext for the transition in progress, to obtain
the initial data value. The function is called each time the data state is
entered.
If a precondition cannot be met in order to create the initial data,
TransitionContext.redirectTo may be called, and null
returned.
DataState<AuthenticatedUser>(
States.authenticated,
InitialData.run((TransitionContext transCtx) {
var token = getAccessToken();
if (token == null) {
ctx.redirectTo(States.unauthenticated);
// It is permissible to return null, but only when redirectTo is
// also called
return null;
}
return AuthenticatedUser.fromToken(token);
},
);
Implementation
factory InitialData.run(GetInitialData<D?> getInitialData) {
return InitialDataByDelegate._(getInitialData);
}