ObservableField<T> class

订阅字段在 ValueNotifier 的基础上加上了可传空 @author sunlunchang

泛型类 ObservableField，继承自 ReadObservableField 提供了设置值的方法，可触发监听器

Inheritance

Constructors

ObservableField({T? value, bool single = false}): 构造函数，初始化 ObservableField 实例 value 字段的初始值，默认为 null super.single 继承父类的 single 属性

hashCode → int: The hash code for this object.
no setterinherited
hasListeners → bool: Whether any listeners are currently registered.
no setterinherited
runtimeType → Type: A representation of the runtime type of the object.
no setterinherited
single → bool: finalinherited
value → T?: 获取字段的值
no setterinherited

addListener(VoidCallback listener) → void: 重写 addListener 方法，用于添加监听器如果已经有监听器且 single 为 true，则不添加新的监听器
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).
inherited
noSuchMethod(Invocation invocation) → dynamic: Invoked when a nonexistent method or property is accessed.
inherited
notifyListeners() → void: 重写 notifyListeners 方法，用于通知所有监听器
inherited
removeListener(VoidCallback listener) → void: Remove a previously registered closure from the list of closures that are notified when the object changes.
inherited
setValue(T? newValue) → void: 设置字段的值如果新值与旧值相同，则不做任何操作否则更新值并通知所有监听器
setValueForcedNotify(T? value) → void: 强制通知监听器如果当前值与传入的值相同，直接通知监听器否则调用 setValue 方法设置新值并通知监听器
toString() → String: A string representation of this object.
inherited