CircularProgressIndicator class Null safety

A Material Design circular progress indicator, which spins to indicate that the application is busy.

A widget that shows progress along a circle. There are two kinds of circular progress indicators:

Determinate. Determinate progress indicators have a specific value at each point in time, and the value should increase monotonically from 0.0 to 1.0, at which time the indicator is complete. To create a determinate progress indicator, use a non-null value between 0.0 and 1.0.
Indeterminate. Indeterminate progress indicators do not have a specific value at each point in time and instead indicate that progress is being made without indicating how much progress remains. To create an indeterminate progress indicator, use a null value.

The indicator arc is displayed with valueColor, an animated value. To specify a constant color use: AlwaysStoppedAnimation<Color>(color).

This example shows a CircularProgressIndicator with a changing value.

To create a local project with this code sample, run:
flutter create --sample=material.CircularProgressIndicator.1 mysample

This sample shows the creation of a CircularProgressIndicator with a changing value. When toggling the switch, CircularProgressIndicator uses a determinate value. As described in: https://m3.material.io/components/progress-indicators/overview

To create a local project with this code sample, run:
flutter create --sample=material.CircularProgressIndicator.2 mysample

Constructors

CircularProgressIndicator({Key? key, double? value, Color? backgroundColor, Color? color, Animation<Color?>? valueColor, double strokeWidth = 4.0, String? semanticsLabel, String? semanticsValue}): Creates a circular progress indicator.
const
CircularProgressIndicator.adaptive({Key? key, double? value, Color? backgroundColor, Animation<Color?>? valueColor, double strokeWidth = 4.0, String? semanticsLabel, String? semanticsValue}): Creates an adaptive progress indicator that is a CupertinoActivityIndicator in iOS and CircularProgressIndicator in material theme/non-iOS.
const

backgroundColor → Color?: Color of the circular track being filled by the circular indicator.
read-onlyoverride
color → Color?: The progress indicator's color.
finalinherited
hashCode → int: The hash code for this object.
read-onlyinherited
key → Key?: Controls how one widget replaces another widget in the tree.
finalinherited
runtimeType → Type: A representation of the runtime type of the object.
read-onlyinherited
semanticsLabel → String?: The SemanticsProperties.label for this progress indicator.
finalinherited
semanticsValue → String?: The SemanticsProperties.value for this progress indicator.
finalinherited
strokeWidth → double: The width of the line used to draw the circle.
final
value → double?: If non-null, the value of this progress indicator.
finalinherited
valueColor → Animation<Color?>?: The progress indicator's color as an animated value.
finalinherited

createElement() → StatefulElement: Creates a StatefulElement to manage this widget's location in the tree.
inherited
createState() → State<CircularProgressIndicator>: Creates the mutable state for this widget at a given location in the tree.
override
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.
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 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