ScrollPhysics class

Determines the physics of a Scrollable widget.

For example, determines how the Scrollable will behave when the user reaches the maximum scroll extent or when the user stops scrolling.

When starting a physics Simulation, the current scroll position and velocity are used as the initial conditions for the particle in the simulation. The movement of the particle in the simulation is then used to determine the scroll position for the widget.

Instead of creating your own subclasses, parent can be used to combine ScrollPhysics objects of different types to get the desired scroll physics. For example:

const BouncingScrollPhysics(parent: AlwaysScrollableScrollPhysics())

You can also use applyTo, which is useful when you already have an instance of ScrollPhysics:

ScrollPhysics physics = const BouncingScrollPhysics();
// ...
final ScrollPhysics mergedPhysics = physics.applyTo(const AlwaysScrollableScrollPhysics());

When implementing a subclass, you must override applyTo so that it returns an appropriate instance of your subclass. Otherwise, classes like Scrollable that inform a ScrollPosition will combine them with the default ScrollPhysics object instead of your custom subclass.