Directionality class Null safety

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.

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. [...]
final, inherited
hashCode int
The hash code for this object. [...]
@nonVirtual, read-only, inherited
key Key?
Controls how one widget replaces another widget in the tree. [...]
final, inherited
runtimeType Type
A representation of the runtime type of the object.
read-only, inherited
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. [...]
@protected, inherited
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 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. [...]
@nonVirtual, 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. [...]