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 [param event] is dispatched. Both [param from_state] and [param to_state] must be immediate children of this state. Returns the currently active substate. Returns the currently active leaf state within the state machine. Returns the previously active substate. Initiates the state and calls [method LimboState._setup] for both itself and all substates. Removes a transition from a state associated with specific [param event]. 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.