CancellableValueNotifier<T> class

Cancellable 取消后 set value 不在发出通知

Inheritance
Available extensions

Constructors

CancellableValueNotifier(T _value, Cancellable _cancellable, [bool notifyWhenEquals = false])

Properties

hashCode → int
The hash code for this object.
no setterinherited
hasListeners → bool
Whether any listeners are currently registered.
no setterinherited
notifyWhenEquals → bool
final
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited
value ↔ T
The current value stored in this notifier.
getter/setter pairoverride

Methods

addCListener(Cancellable cancellable, VoidCallback listener) → void

Available on Listenable, provided by the ListenableCancellable extension

添加 listener, 并且当 cancellable执行cancel时自动移除listener
addCSingleListener(Cancellable cancellable, VoidCallback listener) → void

Available on Listenable, provided by the ListenableCancellable extension

添加 一个唯一性的 listener, 并且当 cancellable执行cancel时自动移除listener, 多次添加也只会执行一次listener, 默认的 addCListener 如果添加多次，会多次调用 listener
addCSingleVListener(Cancellable cancellable, void listener(T value)) → void

Available on ValueNotifier<T>, provided by the ValueNotifierCancellable extension

添加一个 唯一性的 含当前值listener, 当 cancellable执行cancel时自动移除listener， 多次添加也只会执行一次listener,
addCVListener(Cancellable cancellable, void listener(T value)) → void

Available on ValueNotifier<T>, provided by the ValueNotifierCancellable extension

添加一个 含当前值 listener, 当 cancellable执行cancel时自动移除listener，
addListener(VoidCallback listener) → void
Register a closure to be called when the object changes.
override
asStream() → Stream<T>

Available on ValueNotifier<T>, provided by the ValueNotifierCancellable extension

将ValueNotifier转换为一个Stream， listen时会立即发送当前的值
bindCancellable(Cancellable cancellable) → T

Available on T, provided by the ChangeNotifierCancellableV2 extension

与Cancellable关联 当Cancellable cancel时调用dispose
bindLifecycle(ILifecycle lifecycle) → T

Available on T, provided by the ChangeNotifierCancellableV2 extension

与lifecycle关联 当lifecycle destroy时调用dispose
Builder({required Widget builder(BuildContext context, T value, Widget child), Widget child = const SizedBox.shrink(), Key? key}) → Widget

Available on ValueListenable<T>, provided by the ValueNotifierBuilderExt extension

快速构建一个ValueListenableBuilder ignore: non_constant_identifier_names
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).
override
disposeByCancellable(Cancellable cancellable) → void

Available on ChangeNotifier, provided by the ChangeNotifierCancellable extension

firstValue(bool test(T value), {Cancellable? cancellable}) → Future<T>

Available on ValueNotifier<T>, provided by the ValueNotifierCancellable extension

firstWhereValue(bool test(T value), {Cancellable? cancellable}) → Future<T>

Available on ValueNotifier<T>, provided by the ValueNotifierCancellable extension

当value首次满足条件时触发， cancellable 取消时取消监听
noSuchMethod(Invocation invocation) → dynamic
Invoked when a nonexistent method or property is accessed.
inherited
notifyListeners() → void
Call all the registered listeners.
override
removeListener(VoidCallback listener) → void
Remove a previously registered closure from the list of closures that are notified when the object changes.
override
toString() → String
A string representation of this object.
inherited
whenValue(bool test(T value), {Cancellable? cancellable}) → Future<T>

Available on ValueNotifier<T>, provided by the ValueNotifierCancellable extension

Operators

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