RequestFocusAction class Null safety
An Action that requests the focus on the node it is given in its RequestFocusIntent.
This action can be used to request focus for a particular node, by calling Action.invoke like so:
Actions.invoke(context, const RequestFocusIntent(focusNode));
Where the focusNode
is the node for which the focus will be requested.
The difference between requesting focus in this way versus calling FocusNode.requestFocus directly is that it will use the Action registered in the nearest Actions widget associated with RequestFocusIntent to make the request, rather than just requesting focus directly. This allows the action to have additional side effects, like logging, or undo and redo functionality.
This RequestFocusAction class is the default action associated with the RequestFocusIntent in the WidgetsApp, and it simply requests focus. You can redefine the associated action with your own Actions widget.
See FocusTraversalPolicy for more information about focus traversal.
- Inheritance
-
- Object
- Action<
RequestFocusIntent> - RequestFocusAction
Constructors
Properties
-
callingAction
→ Action<
RequestFocusIntent> ? - The Action overridden by this Action.
- 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(
RequestFocusIntent 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.
-
invoke(
RequestFocusIntent intent) → void -
Called when the action is to be performed.
override
-
isEnabled(
RequestFocusIntent 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">@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