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">@protectedread-onlyinherited
hashCode → int
The hash code for this object.
read-onlyinherited
intentType → Type
Gets the type of intent this action responds to.
read-onlyinherited
isActionEnabled → bool
Whether this Action is inherently enabled.
read-onlyinherited
onInvoke → OnInvokeCallback<T>
The callback to be called when invoked.
protected">@protectedfinal
runtimeType → Type
A representation of the runtime type of the object.
read-onlyinherited

Methods

addActionListener(ActionListenerCallback listener) → void
Register a callback to listen for changes to the state of this action.
mustCallSuper">@mustCallSuperinherited
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">@mustCallSuperprotected">@protectedinherited
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.
protected">@protectedvisibleForTesting">@visibleForTestinginherited
removeActionListener(ActionListenerCallback listener) → void
Remove a previously registered closure from the list of closures that are notified when the object changes.
mustCallSuper">@mustCallSuperinherited
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