MaterialStatesController class Null safety

Manages a set of MaterialStates and notifies listeners of changes.

Used by widgets that expose their internal state for the sake of extensions that add support for additional states. See TextButton.statesController for example.

The controller's value is its current set of states. Listeners are notified whenever the value changes. The value should only be changed with update; it should not be modified directly.

Inheritance

Constructors

MaterialStatesController([Set<MaterialState>? value])
Creates a MaterialStatesController.

Properties

hashCode → int
The hash code for this object.
read-onlyinherited
hasListeners → bool
Whether any listeners are currently registered.
protected">@protectedread-onlyinherited
runtimeType → Type
A representation of the runtime type of the object.
read-onlyinherited
value ↔ Set<MaterialState>
The current value stored in this notifier.
read / writeinherited

Methods

addListener(VoidCallback listener) → void
Register a closure to be called when the object changes.
inherited
dispose() → void
Discards any resources used by the object. After this is called, the object is not in a usable state and should be discarded (calls to addListener will throw after the object is disposed).
mustCallSuper">@mustCallSuperinherited
noSuchMethod(Invocation invocation) → dynamic
Invoked when a non-existent method or property is accessed.
inherited
notifyListeners() → void
Call all the registered listeners.
protected">@protectedvisibleForTesting">@visibleForTestinginherited
removeListener(VoidCallback listener) → void
Remove a previously registered closure from the list of closures that are notified when the object changes.
inherited
toString() → String
A string representation of this object.
inherited
update(MaterialState state, bool add) → void
Adds state to value if add is true, and removes it otherwise, and notifies listeners if value has changed.

Operators

operator ==(Object other) → bool
The equality operator.
inherited