Ramp

Ramp is Control.Keyboard.Action:
    with HoldTrait
    .doc: """
Keyboard action that continuously ramps a value while the key is held.

The ramp starts from `initial_value`. The value then changes at `rate` units per second.

An optional shared_state reference allows for sharing the current state among several Ramp
actions. Make sure you have one Ramp action that is the "source of truth" and all other
Ramp actions that shares its state refers to the same one.

Optional `min` and `max` bounds clamp the resulting value.
"""
    initial_value is Real: 0.0
    optional shared_state is Ramp reference
    rate is Real
    optional min is Real
    optional max is Real