CollisionBehavior$cast function
Implementation
CollisionBehavior? CollisionBehavior$cast(value) {
if (value == CollisionBehavior.OPTIONAL_AND_HIDES_LOWER_PRIORITY)
return CollisionBehavior.OPTIONAL_AND_HIDES_LOWER_PRIORITY;
if (value == CollisionBehavior.REQUIRED) return CollisionBehavior.REQUIRED;
if (value == CollisionBehavior.REQUIRED_AND_HIDES_OPTIONAL)
return CollisionBehavior.REQUIRED_AND_HIDES_OPTIONAL;
return null;
}