CurvedCircularProgressIndicator class

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).

{@tool dartpad} This example shows a CurvedCircularProgressIndicator with a changing value.

** See code in examples/api/lib/material/progress_indicator/circular_progress_indicator.0.dart ** {@end-tool}

See also:

• CurvedLinearProgressIndicator, which displays progress along a line.
• RefreshIndicator, which automatically displays a CurvedCircularProgressIndicator when the underlying vertical scrollable is overscrolled.
• material.io/design/components/progress-indicators.html#circular-progress-indicators

Inheritance

• Object
• DiagnosticableTree
• Widget
• StatefulWidget
• ProgressIndicator
• CurvedCircularProgressIndicator

Implementers

• RefreshProgressIndicator

Constructors

CurvedCircularProgressIndicator({Key? key, Duration? animationDuration, double? value, Color? backgroundColor, Color? color, Animation<Color?>? valueColor, double? strokeWidth, String? semanticsLabel, String? semanticsValue})

Creates a circular progress indicator.

const

CurvedCircularProgressIndicator.adaptive({Key? key, double? value, Color? backgroundColor, Animation<Color?>? valueColor, double? strokeWidth, String? semanticsLabel, String? semanticsValue})

Creates an adaptive progress indicator that is a CupertinoActivityIndicator in iOS and CurvedCircularProgressIndicator in material theme/non-iOS.

const

Properties

animationDuration → Duration?

final, inherited

backgroundColor → Color?

Color of the circular track being filled by the circular indicator.

no setter, override

color → Color?

The progress indicator's color.

final, inherited

hashCode → int

The hash code for this object.

no setter, 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.

no setter, inherited

semanticsLabel → String?

The SemanticsProperties.label for this progress indicator.

final, inherited

semanticsValue → String?

The SemanticsProperties.value for this progress indicator.

final, inherited

strokeWidth → double?

The width of the line used to draw the circle.

no setter, override

value → double?

If non-null, the value of this progress indicator.

final, inherited

valueColor → Animation<Color?>?

The progress indicator's color as an animated value.

final, inherited

Methods

createElement() → StatefulElement

Creates a StatefulElement to manage this widget's location in the tree.

inherited

createState() → State<CurvedCircularProgressIndicator>

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 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}) → 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

Operators

operator ==(Object other) → bool

The equality operator.

inherited