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44 lines
1.5 KiB
Plaintext
44 lines
1.5 KiB
Plaintext
/// This element hooks a signal onto the loc the current object is on.
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/// When the object moves, it will unhook the signal and rehook it to the new object.
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/datum/element/connect_loc
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element_flags = ELEMENT_BESPOKE
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argument_hash_start_idx = 2
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/// An assoc list of signal -> procpath to register to the loc this object is on.
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var/list/connections
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/datum/element/connect_loc/Attach(atom/movable/listener, list/connections)
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. = ..()
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if (!istype(listener))
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return ELEMENT_INCOMPATIBLE
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src.connections = connections
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RegisterSignal(listener, COMSIG_MOVABLE_MOVED, PROC_REF(on_moved), override = TRUE)
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update_signals(listener)
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/datum/element/connect_loc/Detach(atom/movable/listener)
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. = ..()
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unregister_signals(listener, listener.loc)
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UnregisterSignal(listener, COMSIG_MOVABLE_MOVED)
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/datum/element/connect_loc/proc/update_signals(atom/movable/listener)
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var/atom/listener_loc = listener.loc
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if(isnull(listener_loc))
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return
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for (var/signal in connections)
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//override=TRUE because more than one connect_loc element instance tracked object can be on the same loc
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listener.RegisterSignal(listener_loc, signal, connections[signal], override=TRUE)
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/datum/element/connect_loc/proc/unregister_signals(datum/listener, atom/old_loc)
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if(isnull(old_loc))
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return
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listener.UnregisterSignal(old_loc, connections)
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/datum/element/connect_loc/proc/on_moved(atom/movable/listener, atom/old_loc)
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SIGNAL_HANDLER
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unregister_signals(listener, old_loc)
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update_signals(listener)
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