CircularProgressIndicator 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).

See also:



CircularProgressIndicator({Key key, double value, Color backgroundColor, Animation<Color> valueColor, double strokeWidth: 4.0, String semanticsLabel, String semanticsValue})
Creates a circular progress indicator. [...]


backgroundColor Color
The progress indicator's background color. [...]
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
semanticsLabel String
{@template flutter.material.progressIndicator.semanticsLabel} The SemanticsProperties.label for this progress indicator. [...]
final, inherited
semanticsValue String
{@template flutter.material.progressIndicator.semanticsValue} The SemanticsProperties.value for this progress indicator. [...]
final, inherited
strokeWidth double
The width of the line used to draw the circle.
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


createElement() StatefulElement
Creates a StatefulElement to manage this widget's location in the tree. [...]
createState() → _CircularProgressIndicatorState
Creates the mutable state for this widget at a given location in the tree. [...]
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. [...]
noSuchMethod(Invocation invocation) → dynamic
Invoked when a non-existent method or property is accessed. [...]
toDiagnosticsNode({String name, DiagnosticsTreeStyle style}) DiagnosticsNode
Returns a debug representation of the object that is used by debugging tools and by DiagnosticsNode.toStringDeep. [...]
toString({DiagnosticLevel minLevel:}) String
Returns a string representation of this object.
toStringDeep({String prefixLineOne: '', String prefixOtherLines, DiagnosticLevel minLevel: DiagnosticLevel.debug}) String
Returns a string representation of this node and its descendants. [...]
toStringShallow({String joiner: ', ', DiagnosticLevel minLevel: DiagnosticLevel.debug}) String
Returns a one-line detailed description of the object. [...]
toStringShort() String
A short, textual description of this widget.


operator ==(Object other) bool
The equality operator. [...]
@nonVirtual, inherited