Controlled

Actually the knob hold the value. The component can't be used as a controlled widget directly.

But, we can redefine the value or position to each sub components. This behaves in the end like a controlled widget.

Create a gauge widget controlled by a random value.

This value is reinjected to the sub components Pointer and Value.

This is an advanced example, with controlled "warning" and "danger" region for the value.