Directionality class

A widget that determines the ambient directionality of text and text-direction-sensitive render objects.

For example, Padding depends on the Directionality to resolve EdgeInsetsDirectional objects into absolute EdgeInsets objects.

This example uses a right-to-left TextDirection and draws a blue box with a right margin of 8 pixels.
link
Directionality(
  textDirection: TextDirection.rtl,
  child: Container(
    margin: const EdgeInsetsDirectional.only(start: 8),
    color: Colors.blue,
  ),
)

Inheritance

Constructors

Directionality({Key? key, required TextDirection textDirection, required Widget child})
Creates a widget that determines the directionality of text and text-direction-sensitive render objects.
const

Properties

child → Widget
The widget below this widget in the tree.
finalinherited
hashCode → int
The hash code for this object.
no setterinherited
key → Key?
Controls how one widget replaces another widget in the tree.
finalinherited
runtimeType → Type
A representation of the runtime type of the object.
no setterinherited
textDirection → TextDirection
The text direction for this subtree.
final

Methods

createElement() → InheritedElement
Inflates this configuration to a concrete instance.
inherited
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.
override
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
updateShouldNotify(covariant Directionality oldWidget) → bool
Whether the framework should notify widgets that inherit from this widget.
override

Operators

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

Static Methods

maybeOf(BuildContext context) → TextDirection?
The text direction from the closest instance of this class that encloses the given context.
of(BuildContext context) → TextDirection
The text direction from the closest instance of this class that encloses the given context.