mirror of
https://github.com/CHOMPStation2/CHOMPStation2.git
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4ba215813e
Co-authored-by: Guti <32563288+TheCaramelion@users.noreply.github.com> Co-authored-by: Kashargul <144968721+Kashargul@users.noreply.github.com>
67 lines
2.5 KiB
Plaintext
67 lines
2.5 KiB
Plaintext
/// This component behaves similar to connect_loc, hooking into a signal on a tracked object's turf
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/// It has the ability to react to that signal on behalf of a separate listener however
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/// This has great use, primarily for components, but it carries with it some overhead
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/// So we do it separately as it needs to hold state which is very likely to lead to bugs if it remains as an element.
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/datum/component/connect_loc_behalf
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dupe_mode = COMPONENT_DUPE_UNIQUE
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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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var/atom/movable/tracked
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var/atom/tracked_loc
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/datum/component/connect_loc_behalf/Initialize(atom/movable/tracked, list/connections)
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. = ..()
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if(!istype(tracked))
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return COMPONENT_INCOMPATIBLE
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src.connections = connections
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src.tracked = tracked
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/datum/component/connect_loc_behalf/RegisterWithParent()
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RegisterSignal(tracked, COMSIG_MOVABLE_MOVED, PROC_REF(on_moved))
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RegisterSignal(tracked, COMSIG_PARENT_QDELETING, PROC_REF(handle_tracked_qdel))
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update_signals()
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/datum/component/connect_loc_behalf/UnregisterFromParent()
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unregister_signals()
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UnregisterSignal(tracked, list(
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COMSIG_MOVABLE_MOVED,
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COMSIG_PARENT_QDELETING,
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))
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tracked = null
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/datum/component/connect_loc_behalf/proc/handle_tracked_qdel()
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SIGNAL_HANDLER // COMSIG_PARENT_QDELETING
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qdel(src)
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/datum/component/connect_loc_behalf/proc/update_signals()
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unregister_signals()
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//You may ask yourself, isn't this just silencing an error?
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//The answer is yes, but there's no good cheap way to fix it
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//What happens is the tracked object or hell the listener gets say, deleted, which makes targets[old_loc] return a null
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//The null results in a bad index, because of course it does
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//It's not a solvable problem though, since both actions, the destroy and the move, are sourced from the same signal send
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//And sending a signal should be agnostic of the order of listeners
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//So we need to either pick the order agnositic, or destroy safe
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//And I picked destroy safe. Let's hope this is the right path!
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if(isnull(tracked.loc))
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return
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tracked_loc = tracked.loc
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for(var/signal in connections)
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parent.RegisterSignal(tracked_loc, signal, connections[signal])
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/datum/component/connect_loc_behalf/proc/unregister_signals()
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if(isnull(tracked_loc))
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return
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parent.UnregisterSignal(tracked_loc, connections)
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tracked_loc = null
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/datum/component/connect_loc_behalf/proc/on_moved(sigtype, atom/movable/tracked, atom/old_loc)
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SIGNAL_HANDLER // COMSIG_MOVABLE_MOVED
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update_signals()
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