sorters! one-way setting! brazen code borrowing!

2022-12-29 20:18:34 -06:00
parent 746885b2ae
commit 34eaf93a01
6 changed files with 221 additions and 2 deletions
@@ -0,0 +1,43 @@
+/// This element hooks a signal onto the loc the current object is on.
+/// When the object moves, it will unhook the signal and rehook it to the new object.
+/datum/element/connect_loc
+	element_flags = ELEMENT_BESPOKE
+	id_arg_index = 2
+
+	/// An assoc list of signal -> procpath to register to the loc this object is on.
+	var/list/connections
+
+/datum/element/connect_loc/Attach(atom/movable/listener, list/connections)
+	. = ..()
+	if (!istype(listener))
+		return ELEMENT_INCOMPATIBLE
+
+	src.connections = connections
+
+	RegisterSignal(listener, COMSIG_MOVABLE_MOVED, .proc/on_moved, override = TRUE)
+	update_signals(listener)
+
+/datum/element/connect_loc/Detach(atom/movable/listener)
+	. = ..()
+	unregister_signals(listener, listener.loc)
+	UnregisterSignal(listener, COMSIG_MOVABLE_MOVED)
+
+/datum/element/connect_loc/proc/update_signals(atom/movable/listener)
+	var/atom/listener_loc = listener.loc
+	if(isnull(listener_loc))
+		return
+
+	for (var/signal in connections)
+		//override=TRUE because more than one connect_loc element instance tracked object can be on the same loc
+		listener.RegisterSignal(listener_loc, signal, connections[signal], override=TRUE)
+
+/datum/element/connect_loc/proc/unregister_signals(datum/listener, atom/old_loc)
+	if(isnull(old_loc))
+		return
+
+	listener.UnregisterSignal(old_loc, connections)
+
+/datum/element/connect_loc/proc/on_moved(atom/movable/listener, atom/old_loc)
+	SIGNAL_HANDLER
+	unregister_signals(listener, old_loc)
+	update_signals(listener)