RoundSliderOverlayShape class Null safety

The default shape of a Slider's thumb overlay.

The shape of the overlay is a circle with the same center as the thumb, but with a larger radius. It animates to full size when the thumb is pressed, and animates back down to size 0 when it is released. It is painted behind the thumb, and is expected to extend beyond the bounds of the thumb so that it is visible.

The overlay color is defined by SliderThemeData.overlayColor.

See also:

  • Slider, which includes an overlay defined by this shape.
  • SliderTheme, which can be used to configure the overlay shape of all sliders in a widget subtree.


RoundSliderOverlayShape({double overlayRadius = 24.0})
Create a slider thumb overlay that draws a circle.


hashCode int
The hash code for this object.
read-only, inherited
overlayRadius double
The preferred radius of the round thumb shape when enabled.
runtimeType Type
A representation of the runtime type of the object.
read-only, inherited


getPreferredSize(bool isEnabled, bool isDiscrete) Size
Returns the preferred size of the shape, based on the given conditions.
noSuchMethod(Invocation invocation) → dynamic
Invoked when a non-existent method or property is accessed.
paint(PaintingContext context, Offset center, {required Animation<double> activationAnimation, required Animation<double> enableAnimation, required bool isDiscrete, required TextPainter labelPainter, required RenderBox parentBox, required SliderThemeData sliderTheme, required TextDirection textDirection, required double value, required double textScaleFactor, required Size sizeWithOverflow}) → void
Paints the shape, taking into account the state passed to it.
toString() String
A string representation of this object.


operator ==(Object other) bool
The equality operator.