BlocBuilder handles building a widget in response to new states.
BlocBuilder is analogous to StreamBuilder but has simplified API to
reduce the amount of boilerplate code needed as well as bloc-specific
performance improvements.
Please refer to BlocListener if you want to "do" anything in response to
state changes such as navigation, showing a dialog, etc...
BlocConsumer exposes a builder and listener in order react to new
states.
BlocConsumer is analogous to a nested BlocListener
and BlocBuilder but reduces the amount of boilerplate needed.
BlocConsumer should only be used when it is necessary to both rebuild UI
and execute other reactions to state changes in the bloc.
Takes a BlocWidgetListener and an optional bloc and invokes
the listener in response to state changes in the bloc.
It should be used for functionality that needs to occur only in response to
a state change such as navigation, showing a SnackBar, showing
a Dialog, etc...
The listener is guaranteed to only be called once for each state change
unlike the builder in BlocBuilder.
Takes a Create function that is responsible for
creating the Bloc or Cubit and a child which will have access
to the instance via BlocProvider.of(context).
It is used as a dependency injection (DI) widget so that a single instance
of a Bloc or Cubit can be provided to multiple widgets within a subtree.
BlocSelector is analogous to BlocBuilder but allows developers to
filter updates by selecting a new value based on the bloc state.
Unnecessary builds are prevented if the selected value does not change.
You can cancel a request by using a cancel token.
One token can be shared with different requests.
when a token's cancel method invoked, all requests
with this token will be cancelled.
A decorator for a LogPrinter that allows for the composition of
different printers to handle different log messages. Provide it's
constructor with a base printer, but include named parameters for
any levels that have a different printer:
LogInterceptor is used to print logs during network requests.
It's better to add LogInterceptor to the tail of the interceptor queue,
otherwise the changes made in the interceptor behind A will not be printed out.
This is because the execution of interceptors is in the order of addition.
Takes a Create function that is responsible for creating the repository
and a child which will have access to the repository via
RepositoryProvider.of(context).
It is used as a dependency injection (DI) widget so that a single instance
of a repository can be provided to multiple widgets within a subtree.
ListFormat specifies the array format
(a single parameter with multiple parameter or multiple parameters with the same name)
and the separator for array items.
Signature for the buildWhen function which takes the previous state and
the current state and is responsible for returning a bool which
determines whether to rebuild BlocBuilder with the current state.
Signature for the listenWhen function which takes the previous state
and the current state and is responsible for returning a bool which
determines whether or not to call BlocWidgetListener of BlocListener
with the current state.
Signature for the builder function which takes the BuildContext and
state and is responsible for returning a widget which is to be rendered.
This is analogous to the builder function in StreamBuilder.
