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:
- CupertinoUserInterfaceLevelData, specifies the visual level for the content in the subtree CupertinoUserInterfaceLevel established.
- Inheritance
-
- Object
- DiagnosticableTree
- Widget
- ProxyWidget
- InheritedWidget
- CupertinoUserInterfaceLevel
Constructors
- CupertinoUserInterfaceLevel({Key? key, required CupertinoUserInterfaceLevelData data, required Widget child})
-
Creates a CupertinoUserInterfaceLevel to change descendant Cupertino widget's
visual level.
const
Properties
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">@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 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">@nonVirtualinherited
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.