Merge pull request #7827 from VOREStation/aro-intercoms

Make intercom power change stateful

code/datums/observation/power_change.dm

@@ -0,0 +1,21 @@
+//	Observer Pattern Implementation: Area Power Change
+//		Registration type: /area
+//
+//		Raised when: An /area has a power change (the APC powers up/down or some channels are enabled/disabled)
+//
+//		Arguments that the called proc should expect:
+//			/area: The area experiencing the power change
+
+GLOBAL_DATUM_INIT(apc_event, /decl/observ/area_power_change, new)
+
+/decl/observ/area_power_change
+	name = "Area Power Change"
+	expected_type = /area
+
+/********************
+* Movement Handling *
+********************/
+
+/area/power_change()
+	. = ..()
+	GLOB.apc_event.raise_event(src)

code/game/objects/items/devices/radio/intercom.dm

@@ -11,9 +11,20 @@
 	flags = NOBLOODY
 	var/circuit = /obj/item/weapon/circuitboard/intercom
 	var/number = 0
-	var/last_tick //used to delay the powercheck
 	var/wiresexposed = 0
 
+/obj/item/device/radio/intercom/Initialize()
+	. = ..()
+	var/area/A = get_area(src)
+	if(A)
+		GLOB.apc_event.register(A, src, /obj/update_icon)
+
+/obj/item/device/radio/intercom/Destroy()
+	var/area/A = get_area(src)
+	if(A)
+		GLOB.apc_event.unregister(A, src, /obj/update_icon)
+	return ..()
+
 /obj/item/device/radio/intercom/custom
 	name = "station intercom (Custom)"
 	broadcasting = 0
@@ -60,7 +71,6 @@
 
 /obj/item/device/radio/intercom/New()
 	..()
-	START_PROCESSING(SSobj, src)
 	circuit = new circuit(src)
 
 /obj/item/device/radio/intercom/department/medbay/New()
@@ -103,10 +113,6 @@
 	..()
 	internal_channels[num2text(RAID_FREQ)] = list(access_syndicate)
 
-/obj/item/device/radio/intercom/Destroy()
-	STOP_PROCESSING(SSobj, src)
-	return ..()
-
 /obj/item/device/radio/intercom/attack_ai(mob/user as mob)
 	src.add_fingerprint(user)
 	spawn (0)
@@ -123,15 +129,8 @@
 		wiresexposed = !wiresexposed
 		to_chat(user, "The wires have been [wiresexposed ? "exposed" : "unexposed"]")
 		playsound(src, W.usesound, 50, 1)
-		if(wiresexposed)
-			if(!on)
-				icon_state = "intercom-p_open"
-			else
-				icon_state = "intercom_open"
-		else
-			icon_state = "intercom"
-		return
-	if(wiresexposed && W.is_wirecutter())
+		update_icon()
+	else if(wiresexposed && W.is_wirecutter())
 		user.visible_message("<span class='warning'>[user] has cut the wires inside \the [src]!</span>", "You have cut the wires inside \the [src].")
 		playsound(src, W.usesound, 50, 1)
 		new/obj/item/stack/cable_coil(get_turf(src), 5)
@@ -149,7 +148,6 @@
 		qdel(src)
 	else
 		src.attack_hand(user)
-	return
 
 /obj/item/device/radio/intercom/receive_range(freq, level)
 	if (!on)
@@ -166,29 +164,21 @@
 
 	return canhear_range
 
-/obj/item/device/radio/intercom/process()
-	if(((world.timeofday - last_tick) > 30) || ((world.timeofday - last_tick) < 0))
-		last_tick = world.timeofday
+/obj/item/device/radio/intercom/update_icon()
+	var/area/A = get_area(src)
+	on = A?.powered(EQUIP)
 
-		if(!src.loc)
-			on = 0
+	if(!on)
+		if(wiresexposed)
+			icon_state = "intercom-p_open"
 		else
-			var/area/A = get_area(src)
-			if(!A)
-				on = 0
-			else
-				on = A.powered(EQUIP) // set "on" to the power status
+			icon_state = "intercom-p"
+	else
+		if(wiresexposed)
+			icon_state = "intercom_open"
+		else
+			icon_state = initial(icon_state)
 
-		if(!on)
-			if(wiresexposed)
-				icon_state = "intercom-p_open"
-			else
-				icon_state = "intercom-p"
-		else
-			if(wiresexposed)
-				icon_state = "intercom_open"
-			else
-				icon_state = initial(icon_state)
 //VOREStation Add Start
 /obj/item/device/radio/intercom/AICtrlClick(var/mob/user)
 	ToggleBroadcast()