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.
Inheritance

Constructors

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

Properties

callingAction Action<T>?
The Action overridden by this Action.
@protected, read-only, inherited
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
isActionEnabled bool
Whether this Action is inherently enabled.
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

Methods

addActionListener(ActionListenerCallback listener) → void
Register a callback to listen for changes to the state of this action.
@mustCallSuper, inherited
consumesKey(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.
inherited
debugFillProperties(DiagnosticPropertiesBuilder properties) → void
Add additional properties associated with the node.
@mustCallSuper, @protected, inherited
invoke(T intent) Object?
Called when the action is to be performed.
override
isEnabled(T intent) bool
Returns true if the action is enabled and is ready to be invoked.
inherited
noSuchMethod(Invocation invocation) → dynamic
Invoked when a non-existent method or property is accessed.
inherited
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.
inherited
toString({DiagnosticLevel minLevel = DiagnosticLevel.info}) String
A string representation of this object.
inherited
toStringShort() String
A brief description of this object, usually just the runtimeType and the hashCode.
inherited

Operators

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