step method
Steps the action forward by the specified time, typically there is no need to directly call this method.
Implementation
void step(double dt) {
for (int i = _actions.length - 1; i >= 0; i--) {
Action action = _actions[i];
action.step(dt);
if (action._finished) {
action._added = false;
_actions.removeAt(i);
}
}
}