UseState<T> class

A ReactterHook that manages a state.

Contains a value of type T which represents the current state.

When value is different to previous state, UseState execute update to notify container instance that has changed and in turn executes onWillUpdate and onDidUpdate.

This example produces one simple UseState:

class AppController {
  late final likesCount = UseState(0, this);
  late final followed = UseState(false, this);
  late final text = UseState("", this);
  late final user = UseState<User?>(null, this);
  late final posts = UseState(<Post>[], this);

  AppController() {
    likesCount.value += 1;
    followed.value = followed.value!;
    text.value = "This is a text";
    user.value = User(name: "name");

    // It's need to force [update] because mantain the previous state
    // and the [context] not aware that this state has changed
    posts.update(() {
      posts.value.add(
          Post(
            user: user.value,
            text: text.value,
          ),
        );
    });
  }
}

Inheritance

• Object
• ReactterHook
• UseState

Constructors

UseState(T initialValue)

A ReactterHook that manages a state.

Properties

$ → _ReactterHookRegister

This variable is used to register ReactterHook and attach the ReactterState that are defined here.

final

hashCode → int

The hash code for this object.

no setter, inherited

initial → T

The initial value in state.

final

instanceAttached → Object?

no setter, inherited

isDisposed → bool

no setter, inherited

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

value ↔ T

Get current value state

getter/setter pair

Methods

attachTo(Object instance) → void

Attaches an object instance to this state.

inherited

detachInstance() → void

Detaches an object instance to this state.

inherited

dispose() → void

Called when this object is removed

inherited

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

refresh() → void

It's used to notify listeners that the state has been updated. It is typically called after making changes to the state object.

inherited

reset() → void

Reset the state to initial value

toString() → String

A string representation of this object.

inherited

update([covariant Function? callback]) → void

Executes callback, and notify the listeners about to update.

inherited

Operators

operator ==(Object other) → bool

The equality operator.

inherited