ContextAction<T extends Intent> class Null safety

An abstract Action subclass that adds an optional BuildContext to the invoke method to be able to provide context to actions.

ActionDispatcher.invokeAction checks to see if the action it is invoking is a ContextAction, and if it is, supplies it with a context.

Inheritance

Constructors

ContextAction()

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
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, [BuildContext? context]) → Object?
Called when the action is to be performed.
protected">@protectedoverride
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