modules - E to L

code/modules/keybindings/focus.dm

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+/datum
+	var/list/focusers //Only initialized when needed. Contains a list of mobs focusing on this.
+
+/mob
+	var/datum/focus //What receives our keyboard inputs. src by default
+
+/mob/proc/set_focus(datum/new_focus)
+	if(focus == new_focus)
+		return
+
+	if(new_focus)
+		if(!new_focus.focusers) //Set up the new focus
+			new_focus.focusers = list()
+		new_focus.focusers += src
+
+	if(focus)
+		focus.focusers -= src //Tell the old focus we're done with it
+
+	focus = new_focus
+	reset_perspective(focus) //Maybe this should be done manually? You figure it out, reader