CupertinoUserInterfaceLevel class Null safety

Establishes a subtree in which CupertinoUserInterfaceLevel.of resolves to the given data.

Querying the current elevation status using CupertinoUserInterfaceLevel.of will cause your widget to rebuild automatically whenever the CupertinoUserInterfaceLevelData changes.

If no CupertinoUserInterfaceLevel is in scope then the CupertinoUserInterfaceLevel.of method will throw an exception. Alternatively, CupertinoUserInterfaceLevel.maybeOf can be used, which returns null instead of throwing if no CupertinoUserInterfaceLevel is in scope.

See also:

Inheritance

Constructors

CupertinoUserInterfaceLevel({Key? key, required CupertinoUserInterfaceLevelData data, required Widget child})
Creates a CupertinoUserInterfaceLevel to change descendant Cupertino widget's visual level.
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

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 CupertinoUserInterfaceLevel 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) CupertinoUserInterfaceLevelData?
The data from the closest instance of this class that encloses the given context, if there is one. [...]
of(BuildContext context) CupertinoUserInterfaceLevelData
The data from the closest instance of this class that encloses the given context. [...]