RefreshProgressIndicator class Null safety

An indicator for the progress of refreshing the contents of a widget.

Typically used for swipe-to-refresh interactions. See RefreshIndicator for a complete implementation of swipe-to-refresh driven by a Scrollable widget.

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

See also:



RefreshProgressIndicator({Key? key, double? value, Color? backgroundColor, Color? color, Animation<Color?>? valueColor, double strokeWidth = defaultStrokeWidth, String? semanticsLabel, String? semanticsValue})
Creates a refresh progress indicator.


backgroundColor Color?
Background color of that fills the circle under the refresh indicator.
read-only, override
color Color?
The progress indicator's 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?
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.
final, inherited
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() State<CircularProgressIndicator>
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
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


defaultStrokeWidth → const double
Default stroke width.