builder property

The builder for the radio button visual.

Use the input state to determine the current state of the radio.

If drawing a radial ink reaction is desired (in Material Design for example), consider providing CustomPaint with a subclass of ToggleablePainter as a CustomPaint.painter, which implements logic to draw a radial ink reaction for this control. The painter is usually configured with the ToggleableStateMixin.reaction, ToggleableStateMixin.position, ToggleableStateMixin.reactionHoverFade, and ToggleableStateMixin.reactionFocusFade animation provided by this mixin. It is expected to draw the visuals of the Toggleable based on the current value of these animations. The animations are triggered by this mixin to transition the Toggleable from one state to another.