FocusCapabilityDelegate mixin

A mixin that provides an interface for managing focus nodes within the Duit kernel driver API.

Classes that use FocusCapabilityDelegate must implement focus management behaviors by overriding the methods. By default, methods throw MissingCapabilityMethodImplementation if not overridden.

See also:

• UnfocusDisposition, for handling how focus should be removed.
• TraversalDirection, for spatial focus navigation.
• Focus cookbook - https://docs.flutter.dev/cookbook/forms/focus
• FocusNode docs - https://api.flutter.dev/flutter/widgets/FocusNode-class.html

Mixin applications

• DuitDriver
• XDriver

Properties

hashCode → int

The hash code for this object.

no setter, inherited

runtimeType → Type

A representation of the runtime type of the object.

no setter, inherited

Methods

attachFocusNode(String nodeId, FocusNode node) → void

Attaches a FocusNode to the delegate, associating it with the provided nodeId.

detachFocusNode(String nodeId) → void

focusInDirection(String nodeId, TraversalDirection direction) → bool

Moves the focus from the node identified by nodeId in the specified direction.

getNode(Object? key) → FocusNode?

Returns the FocusNode associated with the provided key, or null if no such node is attached.

linkDriver(UIDriver driver) → void

Links a UIDriver instance to this holder.

nextFocus(String nodeId) → bool

Moves the focus to the next focusable node in the traversal order relative to the node identified by nodeId.

noSuchMethod(Invocation invocation) → dynamic

Invoked when a nonexistent method or property is accessed.

inherited

previousFocus(String nodeId) → bool

Moves the focus to the previous focusable node in the traversal order relative to the node identified by nodeId.

releaseResources() → void

Called to clean up any external resources, subscriptions, or handlers typically when a delegate is being disposed of or detached. Implementations should ensure all open streams or event sources are closed.

requestFocus(String nodeId) → void

Requests that the focus be moved to the FocusNode associated with the given nodeId.

toString() → String

A string representation of this object.

inherited

unfocus(String nodeId, {UnfocusDisposition disposition = UnfocusDisposition.scope}) → void

Removes focus from the node identified by nodeId and optionally determines the disposition for how focus should be handled within the focus scope.

Operators

operator ==(Object other) → bool

The equality operator.

inherited