SemanticsProperties class

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
  • @immutable

Constructors

SemanticsProperties({bool enabled, bool checked, bool selected, bool toggled, bool button, bool header, bool textField, bool focused, bool inMutuallyExclusiveGroup, bool hidden, bool obscured, bool scopesRoute, bool namesRoute, bool image, bool liveRegion, String label, String value, String increasedValue, String decreasedValue, String hint, SemanticsHintOverrides hintOverrides, TextDirection textDirection, SemanticsSortKey sortKey, 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, VoidCallback onDidGainAccessibilityFocus, VoidCallback onDidLoseAccessibilityFocus, VoidCallback onDismiss, Map<CustomSemanticsAction, VoidCallback> customSemanticsActions })
Creates a semantic annotation.
const

Properties

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
customSemanticsActions → Map<CustomSemanticsAction, VoidCallback>
A map from each supported CustomSemanticsAction to a provided handler. [...]
final
decreasedValue → String
The value that value 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
focused → bool
If non-null, whether the node currently holds input focus. [...]
final
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 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
label → String
Provides a textual description of the widget. [...]
final
liveRegion → bool
If non-null, whether the node should be considered a live region. [...]
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.onMoveCursorBackwardByCharacter. [...]
final
onMoveCursorBackwardByWord → MoveCursorHandler
The handler for SemanticsAction.onMoveCursorBackwardByWord. [...]
final
onMoveCursorForwardByCharacter → MoveCursorHandler
The handler for SemanticsAction.onMoveCursorForwardByCharacter. [...]
final
onMoveCursorForwardByWord → MoveCursorHandler
The handler for SemanticsAction.onMoveCursorForwardByWord. [...]
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
onTap → VoidCallback
The handler for SemanticsAction.tap. [...]
final
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
sortKey → SemanticsSortKey
Determines the position of this node among its siblings in the traversal sort order. [...]
final
textDirection → TextDirection
The reading direction of the label, value, hint, increasedValue, and decreasedValue. [...]
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
value → String
Provides a textual description of the value of the widget. [...]
final
hashCode → int
The hash code for this object. [...]
read-only, inherited
runtimeType → Type
A representation of the runtime type of the object.
read-only, inherited

Methods

debugFillProperties(DiagnosticPropertiesBuilder properties) → void
Add additional properties associated with the node. [...]
override
toStringShort() → String
A brief description of this object, usually just the runtimeType and the hashCode. [...]
override
debugDescribeChildren() → List<DiagnosticsNode>
Returns a list of DiagnosticsNode objects describing this node's children. [...]
@protected, inherited
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 toStringDeep. [...]
inherited
toString({DiagnosticLevel minLevel: DiagnosticLevel.debug }) → String
Returns 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

Operators

operator ==(dynamic other) → bool
The equality operator. [...]
inherited