Event-based Hierarchical State Machine (HSM). Event-based Hierarchical State Machine (HSM) that manages [LimboState] instances and facilitates transitions between them. LimboHSM is a [LimboState] in itself and can also serve as a child of another LimboHSM node. Establishes a transition from one state to another when [code]p_event[/code] is dispatched. Both [code]p_from_state[/code] and [code]p_to_state[/code] must be immediate children of this state. Returns the currently active substate. Returns the currently active leaf state within the state machine. Initiates the state and calls [code]_setup[/code] for both itself and all substates. When set to [code]true[/code], switches the state to [member initial_state] and activates state processing according to [member update_mode]. Calls [method LimboState._update] on itself and the active substate, with the call cascading down to the leaf state. This method is automatically triggered if [member update_mode] is not set to [constant MANUAL]. Useful for defining a transition from any state. The substate that becomes active when the state machine is activated using the [method set_active] method. If not explicitly set, the first child of the LimboHSM will be considered the initial state. Specifies when the state machine should be updated. See [enum UpdateMode]. Emitted when the currently active substate is switched to a different substate. Update the state machine during the idle process. Update the state machine during the physics process. Manually update the state machine by calling [method update] from a script.