GlassFocusRegion class

A shared accessibility and focus region for interactive glass widgets.

Modes

Interactive mode (default constructor)

Encapsulates:

Semantic boundaries and roles.
Keyboard focus traversal via FocusableActionDetector.
Space/Enter ActivateIntent mapping.
The iOS 26-style focus ring painting (using a ValueListenableBuilder to ensure zero GPU cost for touch users).

Observe mode (GlassFocusRegion.observe)

For text inputs and other widgets that already own their FocusNode (e.g. CupertinoTextField). In this mode the widget:

Does not create a FocusableActionDetector.
Does not register any keyboard Actions.
Simply listens to the provided FocusNode and paints the iOS 26-style focus ring when the node gains focus.

All keyboard intent handling and semantics remain with the wrapped widget.

Use this for GlassTextField, GlassSearchBar, or any widget where CupertinoTextField already manages the focus lifecycle.

State Lifting: In interactive mode, this region accepts ValueNotifiers from the parent widget and updates them, allowing the parent to react to hover/focus changes with zero additional rebuilds.

Inheritance

Constructors

GlassFocusRegion({required Widget child, required bool enabled, ShapeBorder? shape, FocusNode? observedFocusNode, ValueNotifier<bool>? isFocusedNotifier, ValueNotifier<bool>? isHoveredNotifier, FocusNode? focusNode, bool canRequestFocus = true, bool autofocus = false, String? semanticLabel, bool isButton = false, bool isSlider = false, bool tracksSelection = false, bool isSelected = false, bool? toggled, VoidCallback? onKeyboardActivate, VoidCallback? semanticOnTap, VoidCallback? semanticOnLongPress, String? semanticValue, String? semanticIncreasedValue, String? semanticDecreasedValue, VoidCallback? semanticOnIncrease, VoidCallback? semanticOnDecrease, Key? key}): Interactive mode: full keyboard traversal, semantics, and focus ring.
const
GlassFocusRegion.observe({required Widget child, required FocusNode focusNode, required ShapeBorder shape, Key? key}): Observe mode: paints the focus ring by listening to an external FocusNode without creating a FocusableActionDetector.

Properties

autofocus → bool: Whether to request focus immediately.
final
canRequestFocus → bool: Whether the widget can request focus.
final
child → Widget: The widget tree inside the focus region.
final
enabled → bool: Whether the widget is interactive and focusable.
final
focusNode → FocusNode?: Externally provided focus node (from the parent's widget parameter).
final
hashCode → int: The hash code for this object.
no setterinherited
isButton → bool: Whether this region should announce as a button to screen readers.
final
isFocusedNotifier → ValueNotifier<bool>?: A notifier that this region will update when keyboard focus arrives/leaves. If null, the region will manage its own internal state.
final
isHoveredNotifier → ValueNotifier<bool>?: A notifier that this region will update when mouse hover enters/exits. If null, the region will manage its own internal state.
final
isSelected → bool: Whether the widget is currently selected (if it supports selection).
final
isSlider → bool: Whether this is a slider for screen readers.
final
key → Key?: Controls how one widget replaces another widget in the tree.
finalinherited
observedFocusNode → FocusNode?: When non-null, this widget operates in "observe" mode.
final
onKeyboardActivate → VoidCallback?: Callback fired when the user presses Space or Enter while focused.
final
runtimeType → Type: A representation of the runtime type of the object.
no setterinherited
semanticDecreasedValue → String?: Semantic decreased value for sliders.
final
semanticIncreasedValue → String?: Semantic increased value for sliders.
final
semanticLabel → String?: The semantic label for screen readers.
final
semanticOnDecrease → VoidCallback?: Callback for decreasing the slider value.
final
semanticOnIncrease → VoidCallback?: Callback for increasing the slider value.
final
semanticOnLongPress → VoidCallback?: Callback fired when screen readers invoke a long press.
final
semanticOnTap → VoidCallback?: Callback fired when screen readers invoke a tap.
final
semanticValue → String?: Semantic value for sliders (e.g. '50%').
final
shape → ShapeBorder?: The exact shape of the widget, used to draw the focus ring. If null, no visual focus ring is painted by this region.
final
toggled → bool?: The toggled state (for switches). If null, this semantic is not applied.
final
tracksSelection → bool: Whether this region participates in a mutual exclusivity group (like a segmented control).
final

Methods

createElement() → StatefulElement: Creates a StatefulElement to manage this widget's location in the tree.
inherited
createState() → State<GlassFocusRegion>: Creates the mutable state for this widget at a given location in the tree.
override
debugDescribeChildren() → List<DiagnosticsNode>: Returns a list of DiagnosticsNode objects describing this node's children.
inherited
debugFillProperties(DiagnosticPropertiesBuilder properties) → void: Add additional properties associated with the node.
inherited
noSuchMethod(Invocation invocation) → dynamic: Invoked when a nonexistent method or property is accessed.
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
toStringDeep({String prefixLineOne = '', String? prefixOtherLines, DiagnosticLevel minLevel = DiagnosticLevel.debug, int wrapWidth = 65}) → String: Returns a string representation of this node and its descendants.
inherited
toStringShallow({String joiner = ', ', DiagnosticLevel minLevel = DiagnosticLevel.debug}) → String: Returns a one-line detailed description of the object.
inherited
toStringShort() → String: A short, textual description of this widget.
inherited

Operators

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