SemanticsProperties class Null safety

Contains properties used by assistive technologies to make the application more accessible.

The properties of this class are used to generate a SemanticsNodes in the semantics tree.

Inheritance
Annotations

Constructors

SemanticsProperties({bool? enabled, bool? checked, bool? selected, bool? toggled, bool? button, bool? link, bool? header, bool? textField, bool? slider, bool? keyboardKey, bool? readOnly, bool? focusable, bool? focused, bool? inMutuallyExclusiveGroup, bool? hidden, bool? obscured, bool? multiline, bool? scopesRoute, bool? namesRoute, bool? image, bool? liveRegion, int? maxValueLength, int? currentValueLength, String? label, AttributedString? attributedLabel, String? value, AttributedString? attributedValue, String? increasedValue, AttributedString? attributedIncreasedValue, String? decreasedValue, AttributedString? attributedDecreasedValue, String? hint, String? tooltip, AttributedString? attributedHint, SemanticsHintOverrides? hintOverrides, TextDirection? textDirection, SemanticsSortKey? sortKey, SemanticsTag? tagForChildren, VoidCallback? onTap, VoidCallback? onLongPress, VoidCallback? onScrollLeft, VoidCallback? onScrollRight, VoidCallback? onScrollUp, VoidCallback? onScrollDown, VoidCallback? onIncrease, VoidCallback? onDecrease, VoidCallback? onCopy, VoidCallback? onCut, VoidCallback? onPaste, MoveCursorHandler? onMoveCursorForwardByCharacter, MoveCursorHandler? onMoveCursorBackwardByCharacter, MoveCursorHandler? onMoveCursorForwardByWord, MoveCursorHandler? onMoveCursorBackwardByWord, SetSelectionHandler? onSetSelection, SetTextHandler? onSetText, VoidCallback? onDidGainAccessibilityFocus, VoidCallback? onDidLoseAccessibilityFocus, VoidCallback? onDismiss, Map<CustomSemanticsAction, VoidCallback>? customSemanticsActions})
Creates a semantic annotation.
const

Properties

attributedDecreasedValue → AttributedString?
The AttributedString that value or attributedValue will become after a SemanticsAction.decrease action has been performed on this widget.
final
attributedHint → AttributedString?
Provides an AttributedString version of brief textual description of the result of an action performed on the widget.
final
attributedIncreasedValue → AttributedString?
The AttributedString that value or attributedValue will become after a SemanticsAction.increase action has been performed on this widget.
final
attributedLabel → AttributedString?
Provides an AttributedString version of textual description of the widget.
final
attributedValue → AttributedString?
Provides an AttributedString version of textual description of the value of the widget.
final
button → bool?
If non-null, indicates that this subtree represents a button.
final
checked → bool?
If non-null, indicates that this subtree represents a checkbox or similar widget with a "checked" state, and what its current state is.
final
currentValueLength → int?
The current number of characters that have been entered into an editable text field.
final
customSemanticsActions → Map<CustomSemanticsAction, VoidCallback>?
A map from each supported CustomSemanticsAction to a provided handler.
final
decreasedValue → String?
The value that value or attributedValue will become after a SemanticsAction.decrease action has been performed on this widget.
final
enabled → bool?
If non-null, indicates that this subtree represents something that can be in an enabled or disabled state.
final
focusable → bool?
If non-null, whether the node is able to hold input focus.
final
focused → bool?
If non-null, whether the node currently holds input focus.
final
hashCode → int
The hash code for this object.
read-onlyinherited
If non-null, indicates that this subtree represents a header.
final
hidden → bool?
If non-null, whether the node is considered hidden.
final
hint → String?
Provides a brief textual description of the result of an action performed on the widget.
final
hintOverrides → SemanticsHintOverrides?
Provides hint values which override the default hints on supported platforms.
final
image → bool?
If non-null, whether the node represents an image.
final
increasedValue → String?
The value that value or attributedValue will become after a SemanticsAction.increase action has been performed on this widget.
final
inMutuallyExclusiveGroup → bool?
If non-null, whether a semantic node is in a mutually exclusive group.
final
keyboardKey → bool?
If non-null, indicates that this subtree represents a keyboard key.
final
label → String?
Provides a textual description of the widget.
final
If non-null, indicates that this subtree represents a link.
final
liveRegion → bool?
If non-null, whether the node should be considered a live region.
final
maxValueLength → int?
The maximum number of characters that can be entered into an editable text field.
final
multiline → bool?
Whether the value is coming from a field that supports multiline text editing.
final
namesRoute → bool?
If non-null, whether the node contains the semantic label for a route.
final
obscured → bool?
If non-null, whether value should be obscured.
final
onCopy → VoidCallback?
The handler for SemanticsAction.copy.
final
onCut → VoidCallback?
The handler for SemanticsAction.cut.
final
onDecrease → VoidCallback?
The handler for SemanticsAction.decrease.
final
onDidGainAccessibilityFocus → VoidCallback?
The handler for SemanticsAction.didGainAccessibilityFocus.
final
onDidLoseAccessibilityFocus → VoidCallback?
The handler for SemanticsAction.didLoseAccessibilityFocus.
final
onDismiss → VoidCallback?
The handler for SemanticsAction.dismiss.
final
onIncrease → VoidCallback?
The handler for SemanticsAction.increase.
final
onLongPress → VoidCallback?
The handler for SemanticsAction.longPress.
final
onMoveCursorBackwardByCharacter → MoveCursorHandler?
The handler for SemanticsAction.moveCursorBackwardByCharacter.
final
onMoveCursorBackwardByWord → MoveCursorHandler?
The handler for SemanticsAction.moveCursorBackwardByWord.
final
onMoveCursorForwardByCharacter → MoveCursorHandler?
The handler for SemanticsAction.moveCursorForwardByCharacter.
final
onMoveCursorForwardByWord → MoveCursorHandler?
The handler for SemanticsAction.moveCursorForwardByWord.
final
onPaste → VoidCallback?
The handler for SemanticsAction.paste.
final
onScrollDown → VoidCallback?
The handler for SemanticsAction.scrollDown.
final
onScrollLeft → VoidCallback?
The handler for SemanticsAction.scrollLeft.
final
onScrollRight → VoidCallback?
The handler for SemanticsAction.scrollRight.
final
onScrollUp → VoidCallback?
The handler for SemanticsAction.scrollUp.
final
onSetSelection → SetSelectionHandler?
The handler for SemanticsAction.setSelection.
final
onSetText → SetTextHandler?
The handler for SemanticsAction.setText.
final
onTap → VoidCallback?
The handler for SemanticsAction.tap.
final
readOnly → bool?
If non-null, indicates that this subtree is read only.
final
runtimeType → Type
A representation of the runtime type of the object.
read-onlyinherited
scopesRoute → bool?
If non-null, whether the node corresponds to the root of a subtree for which a route name should be announced.
final
selected → bool?
If non-null indicates that this subtree represents something that can be in a selected or unselected state, and what its current state is.
final
slider → bool?
If non-null, indicates that this subtree represents a slider.
final
sortKey → SemanticsSortKey?
Determines the position of this node among its siblings in the traversal sort order.
final
tagForChildren → SemanticsTag?
A tag to be applied to the child SemanticsNodes of this widget.
final
textDirection → TextDirection?
The reading direction of the label, value, increasedValue, decreasedValue, and hint.
final
textField → bool?
If non-null, indicates that this subtree represents a text field.
final
toggled → bool?
If non-null, indicates that this subtree represents a toggle switch or similar widget with an "on" state, and what its current state is.
final
tooltip → String?
Provides a textual description of the widget's tooltip.
final
value → String?
Provides a textual description of the value of the widget.
final

Methods

debugDescribeChildren() → List<DiagnosticsNode>
Returns a list of DiagnosticsNode objects describing this node's children.
protected">@protectedinherited
debugFillProperties(DiagnosticPropertiesBuilder properties) → void
Add additional properties associated with the node.
override
noSuchMethod(Invocation invocation) → dynamic
Invoked when a non-existent 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}) → 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 brief description of this object, usually just the runtimeType and the hashCode.
override

Operators

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