CallbackAction<T extends Intent> class Null safety

An Action that takes a callback in order to configure it without having to create an explicit Action subclass just to call a callback.

See also:

  • Shortcuts, which is a widget that contains a key map, in which it looks up key combinations in order to invoke actions.
  • Actions, which is a widget that defines a map of Intent to Action and allows redefining of actions for its descendants.
  • ActionDispatcher, a class that takes an Action and invokes it using a FocusNode for context.


CallbackAction({required OnInvokeCallback<T> onInvoke})
A constructor for a CallbackAction. [...]


hashCode int
The hash code for this object. [...]
read-only, inherited
intentType Type
Gets the type of intent this action responds to.
read-only, inherited
onInvoke OnInvokeCallback<T>
The callback to be called when invoked. [...]
@protected, final
runtimeType Type
A representation of the runtime type of the object.
read-only, inherited


addActionListener(ActionListenerCallback listener) → void
Register a callback to listen for changes to the state of this action. [...]
@mustCallSuper, inherited
consumesKey(covariant T intent) bool
Indicates whether this action should treat key events mapped to this action as being "handled" when it is invoked via the key event. [...]
debugFillProperties(DiagnosticPropertiesBuilder properties) → void
Add additional properties associated with the node. [...]
@mustCallSuper, @protected, inherited
invoke(covariant T intent) Object?
Called when the action is to be performed. [...]
isEnabled(covariant T intent) bool
Returns true if the action is enabled and is ready to be invoked. [...]
noSuchMethod(Invocation invocation) → dynamic
Invoked when a non-existent method or property is accessed. [...]
notifyActionListeners() → void
Call all the registered listeners. [...]
removeActionListener(ActionListenerCallback listener) → void
Remove a previously registered closure from the list of closures that are notified when the object changes. [...]
@mustCallSuper, inherited
toDiagnosticsNode({String? name, DiagnosticsTreeStyle? style}) DiagnosticsNode
Returns a debug representation of the object that is used by debugging tools and by DiagnosticsNode.toStringDeep. [...]
toString({DiagnosticLevel minLevel:}) String
A string representation of this object. [...]
toStringShort() String
A brief description of this object, usually just the runtimeType and the hashCode. [...]


operator ==(Object other) bool
The equality operator. [...]