[MIRROR] CanUseTopic() refactor. (#1829)

* CanUseTopic() refactor. (#54747)

* CanUseTopic() refactor.

* Forgot about default_can_use_topic. Tested and working.

* Update bin.dm

* no-nonsense.

* CanUseTopic() refactor.

Co-authored-by: Ghom <42542238+Ghommie@users.noreply.github.com>

code/__DEFINES/misc.dm

@@ -75,11 +75,11 @@
 
 #define TRANSITIONEDGE			7 //Distance from edge to move to another z-level
 
+//used by canUseTopic()
 #define BE_CLOSE TRUE		//in the case of a silicon, to select if they need to be next to the atom
 #define NO_DEXTERITY TRUE	//if other mobs (monkeys, aliens, etc) can use this // I had to change 20+ files because some non-dnd-playing fuckchumbis can't spell "dexterity"
-#define NO_TK TRUE
-#define FLOOR_OKAY TRUE     // if you can use it while resting
-//used by canUseTopic()
+#define NO_TK TRUE			// if you can't use it from a distance with telekinesis
+#define FLOOR_OKAY TRUE		// if you can use it while resting
 
 //singularity defines
 #define STAGE_ONE 1

code/datums/components/rotation.dm

@@ -133,7 +133,7 @@
 	after_rotation.Invoke(user,rotation_type)
 
 /datum/component/simple_rotation/proc/default_can_user_rotate(mob/living/user, rotation_type)
-	if(!istype(user) || !user.canUseTopic(parent, BE_CLOSE, NO_DEXTERITY))
+	if(!istype(user) || !user.canUseTopic(parent, BE_CLOSE, NO_DEXTERITY, FALSE, !iscyborg(user)))
 		return FALSE
 	return TRUE
 

code/game/machinery/computer/buildandrepair.dm

@@ -169,7 +169,7 @@
 
 /obj/structure/frame/computer/AltClick(mob/user)
 	..()
-	if(!isliving(user) || !user.canUseTopic(src, BE_CLOSE, ismonkey(user)))
+	if(!user.canUseTopic(src, BE_CLOSE, NO_DEXTERITY, FALSE, !iscyborg(user)))
 		return
 
 	if(anchored)

code/game/machinery/launch_pad.dm

@@ -243,9 +243,7 @@
 /obj/machinery/launchpad/briefcase/MouseDrop(over_object, src_location, over_location)
 	. = ..()
 	if(over_object == usr)
-		if(!briefcase || !usr.can_hold_items())
-			return
-		if(!usr.canUseTopic(src, BE_CLOSE, ismonkey(usr)))
+		if(!briefcase || !usr.canUseTopic(src, BE_CLOSE, NO_DEXTERITY, FALSE, TRUE))
 			return
 		usr.visible_message("<span class='notice'>[usr] starts closing [src]...</span>", "<span class='notice'>You start closing [src]...</span>")
 		if(do_after(usr, 30, target = usr))

code/game/objects/items.dm

@@ -421,7 +421,7 @@ GLOBAL_VAR_INIT(embedpocalypse, FALSE) // if true, all items will be able to emb
 /obj/item/attack_alien(mob/user)
 	var/mob/living/carbon/alien/A = user
 
-	if(!ISADVANCEDTOOLUSER(A))
+	if(!user.can_hold_items(src))
 		if(src in A.contents) // To stop Aliens having items stuck in their pockets
 			A.dropItemToGround(src)
 		to_chat(user, "<span class='warning'>Your claws aren't capable of such fine manipulation!</span>")

code/game/objects/items/crayons.dm

@@ -159,14 +159,13 @@
 		ui.open()
 
 /obj/item/toy/crayon/spraycan/AltClick(mob/user)
-	if(user.canUseTopic(src, BE_CLOSE, ismonkey(user)))
-		if(has_cap)
-			is_capped = !is_capped
-			to_chat(user, "<span class='notice'>The cap on [src] is now [is_capped ? "on" : "off"].</span>")
-			update_icon()
+	if(has_cap && user.canUseTopic(src, BE_CLOSE, NO_DEXTERITY, FALSE, TRUE))
+		is_capped = !is_capped
+		to_chat(user, "<span class='notice'>The cap on [src] is now [is_capped ? "on" : "off"].</span>")
+		update_icon()
 
 /obj/item/toy/crayon/CtrlClick(mob/user)
-	if(can_change_colour && !isturf(loc) && user.canUseTopic(src, BE_CLOSE, ismonkey(user)))
+	if(can_change_colour && !isturf(loc) && user.canUseTopic(src, BE_CLOSE, NO_DEXTERITY, FALSE, TRUE))
 		select_colour(user)
 	else
 		return ..()
@@ -262,7 +261,7 @@
 
 /obj/item/toy/crayon/proc/select_colour(mob/user)
 	var/chosen_colour = input(user, "", "Choose Color", paint_color) as color|null
-	if (!isnull(chosen_colour) && user.canUseTopic(src, BE_CLOSE, ismonkey(user)))
+	if (!isnull(chosen_colour) && user.canUseTopic(src, BE_CLOSE, NO_DEXTERITY, FALSE, TRUE))
 		paint_color = chosen_colour
 		return TRUE
 	return FALSE

code/game/objects/items/credit_holochip.dm

@@ -82,10 +82,10 @@
 		qdel(H)
 
 /obj/item/holochip/AltClick(mob/user)
-	if(!istype(user) || !user.canUseTopic(src, BE_CLOSE, ismonkey(user)))
+	if(!user.canUseTopic(src, BE_CLOSE, NO_DEXTERITY, FALSE, !iscyborg(user)))
 		return
 	var/split_amount = round(input(user,"How many credits do you want to extract from the holochip?") as null|num)
-	if(split_amount == null || split_amount <= 0 || !user.canUseTopic(src, BE_CLOSE, ismonkey(user)))
+	if(split_amount == null || split_amount <= 0 || !user.canUseTopic(src, BE_CLOSE, NO_DEXTERITY, FALSE, !iscyborg(user)))
 		return
 	else
 		var/new_credits = spend(split_amount, TRUE)

code/game/objects/items/devices/desynchronizer.dm

@@ -33,7 +33,7 @@
 	. += "<span class='notice'>Can be used again to interrupt the effect early. The recharge time is the same as the time spent in desync.</span>"
 
 /obj/item/desynchronizer/AltClick(mob/living/user)
-	if(!istype(user) || !user.canUseTopic(src, BE_CLOSE, ismonkey(user)))
+	if(!user.canUseTopic(src, BE_CLOSE, NO_DEXTERITY, FALSE, !iscyborg(user)))
 		return
 	var/new_duration = input(user, "Set the duration (5-300):", "Desynchronizer", duration / 10) as null|num
 	if(new_duration)

code/game/objects/items/devices/quantum_keycard.dm

@@ -18,7 +18,7 @@
 		. += "<span class='notice'>Insert [src] into an active quantum pad to link it.</span>"
 
 /obj/item/quantum_keycard/AltClick(mob/living/user)
-	if(!istype(user) || !user.canUseTopic(src, BE_CLOSE, ismonkey(user)))
+	if(!istype(user) || !user.canUseTopic(src, BE_CLOSE, NO_DEXTERITY, FALSE, !iscyborg(user)))
 		return
 	to_chat(user, "<span class='notice'>You start pressing [src]'s unlink button...</span>")
 	if(do_after(user, 40, target = src))

code/game/objects/items/devices/swapper.dm

@@ -69,7 +69,7 @@
 		. += "<span class='notice'><b>Not Linked.</b> Use on another quantum spin inverter to establish a quantum link.</span>"
 
 /obj/item/swapper/AltClick(mob/living/user)
-	if(!istype(user) || !user.canUseTopic(src, BE_CLOSE, ismonkey(user)))
+	if(!user.canUseTopic(src, BE_CLOSE, NO_DEXTERITY, FALSE, !iscyborg(user)))
 		return
 	to_chat(user, "<span class='notice'>You break the current quantum link.</span>")
 	if(!QDELETED(linked_swapper))

code/game/objects/items/extinguisher.dm

@@ -231,7 +231,7 @@
 	addtimer(CALLBACK(src, /obj/item/extinguisher/proc/move_chair, B, movementdirection, repetition), timer_seconds)
 
 /obj/item/extinguisher/AltClick(mob/user)
-	if(!user.canUseTopic(src, BE_CLOSE, ismonkey(user)))
+	if(!user.canUseTopic(src, BE_CLOSE, NO_DEXTERITY, FALSE, TRUE))
 		return
 	if(!user.is_holding(src))
 		to_chat(user, "<span class='notice'>You must be holding the [src] in your hands do this!</span>")

code/game/objects/items/flamethrower.dm

@@ -146,7 +146,7 @@
 	toggle_igniter(user)
 
 /obj/item/flamethrower/AltClick(mob/user)
-	if(ptank && isliving(user) && user.canUseTopic(src, BE_CLOSE, ismonkey(user)))
+	if(ptank && isliving(user) && user.canUseTopic(src, BE_CLOSE, NO_DEXTERITY, FALSE, TRUE))
 		user.put_in_hands(ptank)
 		ptank = null
 		to_chat(user, "<span class='notice'>You remove the plasma tank from [src]!</span>")

code/game/objects/items/pet_carrier.dm

@@ -155,7 +155,7 @@
 
 /obj/item/pet_carrier/MouseDrop(atom/over_atom)
 	. = ..()
-	if(isopenturf(over_atom) && usr.canUseTopic(src, BE_CLOSE, ismonkey(usr)) && usr.Adjacent(over_atom) && open && occupants.len)
+	if(isopenturf(over_atom) && usr.canUseTopic(src, BE_CLOSE, NO_DEXTERITY, FALSE, !iscyborg(usr)) && usr.Adjacent(over_atom) && open && occupants.len)
 		usr.visible_message("<span class='notice'>[usr] unloads [src].</span>", \
 		"<span class='notice'>You unload [src] onto [over_atom].</span>")
 		for(var/V in occupants)

code/game/objects/items/stacks/stack.dm

@@ -445,23 +445,17 @@
 	. = ..()
 	if(isturf(loc)) // to prevent people that are alt clicking a tile to see its content from getting undesidered pop ups
 		return
-	if(!istype(user) || !user.canUseTopic(src, BE_CLOSE, ismonkey(user)))
+	if(is_cyborg || !user.canUseTopic(src, BE_CLOSE, NO_DEXTERITY, FALSE, !iscyborg(user)) || zero_amount())
 		return
-	if(is_cyborg)
+	//get amount from user
+	var/max = get_amount()
+	var/stackmaterial = round(input(user,"How many sheets do you wish to take out of this stack? (Maximum  [max])") as null|num)
+	max = get_amount()
+	stackmaterial = min(max, stackmaterial)
+	if(stackmaterial == null || stackmaterial <= 0 || !user.canUseTopic(src, BE_CLOSE, NO_DEXTERITY, FALSE, !iscyborg(user)))
 		return
-	else
-		if(zero_amount())
-			return
-		//get amount from user
-		var/max = get_amount()
-		var/stackmaterial = round(input(user,"How many sheets do you wish to take out of this stack? (Maximum  [max])") as null|num)
-		max = get_amount()
-		stackmaterial = min(max, stackmaterial)
-		if(stackmaterial == null || stackmaterial <= 0 || !user.canUseTopic(src, BE_CLOSE, ismonkey(user)))
-			return
-		else
-			split_stack(user, stackmaterial)
-			to_chat(user, "<span class='notice'>You take [stackmaterial] sheets out of the stack.</span>")
+	split_stack(user, stackmaterial)
+	to_chat(user, "<span class='notice'>You take [stackmaterial] sheets out of the stack.</span>")
 
 /** Splits the stack into two stacks.
   *

code/game/objects/items/storage/belt.dm

@@ -694,7 +694,7 @@
 		. += "<span class='notice'>Alt-click it to quickly draw the blade.</span>"
 
 /obj/item/storage/belt/sabre/AltClick(mob/user)
-	if(!iscarbon(user) || !user.canUseTopic(src, BE_CLOSE, ismonkey(user)))
+	if(!user.canUseTopic(src, BE_CLOSE, NO_DEXTERITY, FALSE, TRUE))
 		return
 	if(length(contents))
 		var/obj/item/I = contents[1]

code/game/objects/items/storage/fancy.dm

@@ -217,8 +217,8 @@
 	if(spawn_coupon)
 		. += "<span class='notice'>There's a coupon on the back of the pack! You can tear it off once it's empty.</span>"
 
-/obj/item/storage/fancy/cigarettes/AltClick(mob/living/carbon/user)
-	if(!istype(user) || !user.canUseTopic(src, BE_CLOSE, ismonkey(user)))
+/obj/item/storage/fancy/cigarettes/AltClick(mob/user)
+	if(!user.canUseTopic(src, BE_CLOSE, NO_DEXTERITY, FALSE, TRUE))
 		return
 	var/obj/item/clothing/mask/cigarette/W = locate(/obj/item/clothing/mask/cigarette) in contents
 	if(W && contents.len > 0)

code/game/objects/structures/beds_chairs/chair.dm

@@ -37,7 +37,7 @@
 	var/mob/living/L = user
 
 	if(istype(L))
-		if(!user.canUseTopic(src, BE_CLOSE, ismonkey(user)))
+		if(!user.canUseTopic(src, BE_CLOSE, NO_DEXTERITY, FALSE, !iscyborg(user)))
 			return FALSE
 		else
 			return TRUE
@@ -240,9 +240,9 @@
 /obj/structure/chair/MouseDrop(over_object, src_location, over_location)
 	. = ..()
 	if(over_object == usr && Adjacent(usr))
-		if(!item_chair || !usr.can_hold_items() || has_buckled_mobs() || src.flags_1 & NODECONSTRUCT_1)
+		if(!item_chair || has_buckled_mobs() || src.flags_1 & NODECONSTRUCT_1)
 			return
-		if(!usr.canUseTopic(src, BE_CLOSE, ismonkey(usr)))
+		if(!usr.canUseTopic(src, BE_CLOSE, NO_DEXTERITY, FALSE, TRUE))
 			return
 		usr.visible_message("<span class='notice'>[usr] grabs \the [src.name].</span>", "<span class='notice'>You grab \the [src.name].</span>")
 		var/obj/item/C = new item_chair(loc)
@@ -415,9 +415,9 @@
 	if(has_gravity())
 		playsound(src, 'sound/machines/clockcult/integration_cog_install.ogg', 50, TRUE)
 
-/obj/structure/chair/bronze/AltClick(mob/living/user)
+/obj/structure/chair/bronze/AltClick(mob/user)
 	turns = 0
-	if(!istype(user) || !user.canUseTopic(src, BE_CLOSE, ismonkey(user)))
+	if(!user.canUseTopic(src, BE_CLOSE, NO_DEXTERITY, FALSE, !iscyborg(user)))
 		return
 	if(!(datum_flags & DF_ISPROCESSING))
 		user.visible_message("<span class='notice'>[user] spins [src] around, and the last vestiges of Ratvarian technology keeps it spinning FOREVER.</span>", \

code/game/objects/structures/extinguisher.dm

@@ -110,7 +110,7 @@
 	return attack_hand(user)
 
 /obj/structure/extinguisher_cabinet/AltClick(mob/living/user)
-	if(!istype(user) || !user.canUseTopic(src, BE_CLOSE, ismonkey(user)))
+	if(!user.canUseTopic(src, BE_CLOSE, NO_DEXTERITY, FALSE, TRUE))
 		return
 	toggle_cabinet(user)
 

code/game/objects/structures/reflector.dm

@@ -157,14 +157,14 @@
 		to_chat(user, "<span class='warning'>The rotation is locked!</span>")
 		return FALSE
 	var/new_angle = input(user, "Input a new angle for primary reflection face.", "Reflector Angle", rotation_angle) as null|num
-	if(!user.canUseTopic(src, BE_CLOSE, ismonkey(user)))
+	if(!user.canUseTopic(src, BE_CLOSE, NO_DEXTERITY, FALSE, !iscyborg(user)))
 		return
 	if(!isnull(new_angle))
 		setAngle(SIMPLIFY_DEGREES(new_angle))
 	return TRUE
 
 /obj/structure/reflector/AltClick(mob/user)
-	if(!user.canUseTopic(src, BE_CLOSE, ismonkey(user)))
+	if(!user.canUseTopic(src, BE_CLOSE, NO_DEXTERITY, FALSE, !iscyborg(user)))
 		return
 	else if(finished)
 		rotate(user)

code/game/objects/structures/statues.dm

@@ -28,7 +28,7 @@
 	to_chat(user, "<span class='warning'>It's bolted to the floor, you'll need to unwrench it first.</span>")
 
 /obj/structure/statue/proc/can_user_rotate(mob/user)
-	return isliving(user) && user.canUseTopic(src, BE_CLOSE, no_dexterity = ismonkey(user))
+	return !user.canUseTopic(src, BE_CLOSE, NO_DEXTERITY, FALSE, !iscyborg(user))
 
 /obj/structure/statue/attackby(obj/item/W, mob/living/user, params)
 	add_fingerprint(user)

code/modules/antagonists/revenant/revenant.dm

@@ -83,7 +83,7 @@
 	AddSpell(new /obj/effect/proc_holder/spell/aoe_turf/revenant/malfunction(null))
 	random_revenant_name()
 
-/mob/living/simple_animal/revenant/canUseTopic(atom/movable/M, be_close=FALSE, no_dexterity=FALSE, no_tk=FALSE)
+/mob/living/simple_animal/revenant/canUseTopic(atom/movable/M, be_close=FALSE, no_dexterity=FALSE, no_tk=FALSE, no_hands = FALSE, floor_okay=FALSE)
 	return FALSE
 
 /mob/living/simple_animal/revenant/proc/random_revenant_name()

code/modules/atmospherics/machinery/portable/portable_atmospherics.dm

@@ -91,7 +91,7 @@
 
 /obj/machinery/portable_atmospherics/AltClick(mob/living/user)
 	. = ..()
-	if(!istype(user) || !user.canUseTopic(src, BE_CLOSE, !ismonkey(user)) || !can_interact(user))
+	if(!istype(user) || !user.canUseTopic(src, BE_CLOSE, NO_DEXTERITY, FALSE, !iscyborg(user)) || !can_interact(user))
 		return
 	if(holding)
 		to_chat(user, "<span class='notice'>You remove [holding] from [src].</span>")

code/modules/clothing/head/jobs.dm

@@ -99,16 +99,16 @@
 	. += "<span class='notice'>Alt-click to take a candy corn.</span>"
 
 /obj/item/clothing/head/fedora/det_hat/AltClick(mob/user)
-	if(user.canUseTopic(src, BE_CLOSE, ismonkey(user)))
-		..()
-		if(loc == user)
-			if(candy_cooldown < world.time)
-				var/obj/item/food/candy_corn/CC = new /obj/item/food/candy_corn(src)
-				user.put_in_hands(CC)
-				to_chat(user, "<span class='notice'>You slip a candy corn from your hat.</span>")
-				candy_cooldown = world.time+1200
-			else
-				to_chat(user, "<span class='warning'>You just took a candy corn! You should wait a couple minutes, lest you burn through your stash.</span>")
+	. = ..()
+	if(loc != user || !user.canUseTopic(src, BE_CLOSE, NO_DEXTERITY, FALSE, TRUE))
+		return
+	if(candy_cooldown < world.time)
+		var/obj/item/food/candy_corn/CC = new /obj/item/food/candy_corn(src)
+		user.put_in_hands(CC)
+		to_chat(user, "<span class='notice'>You slip a candy corn from your hat.</span>")
+		candy_cooldown = world.time+1200
+	else
+		to_chat(user, "<span class='warning'>You just took a candy corn! You should wait a couple minutes, lest you burn through your stash.</span>")
 
 
 //Mime

code/modules/clothing/head/soft_caps.dm

@@ -23,9 +23,7 @@
 
 /obj/item/clothing/head/soft/AltClick(mob/user)
 	..()
-	if(!user.canUseTopic(src, BE_CLOSE, ismonkey(user)))
-		return
-	else
+	if(user.canUseTopic(src, BE_CLOSE, NO_DEXTERITY, FALSE, !iscyborg(user)))
 		flip(user)
 
 

code/modules/clothing/masks/breath.dm

@@ -23,9 +23,7 @@
 
 /obj/item/clothing/mask/breath/AltClick(mob/user)
 	..()
-	if(!user.canUseTopic(src, BE_CLOSE, ismonkey(user)))
-		return
-	else
+	if(!user.canUseTopic(src, BE_CLOSE, NO_DEXTERITY, FALSE, !iscyborg(user)))
 		adjustmask(user)
 
 /obj/item/clothing/mask/breath/examine(mob/user)

code/modules/clothing/spacesuits/_spacesuits.dm

@@ -165,13 +165,13 @@
 
 /// Open the cell cover when ALT+Click on the suit
 /obj/item/clothing/suit/space/AltClick(mob/living/user)
-	if(!user || !user.canUseTopic(src, BE_CLOSE, ismonkey(user)))
+	if(!user.canUseTopic(src, BE_CLOSE, NO_DEXTERITY, FALSE, !iscyborg(user)))
 		return ..()
 	toggle_spacesuit_cell(user)
 
 /// Remove the cell whent he cover is open on CTRL+Click
 /obj/item/clothing/suit/space/CtrlClick(mob/living/user)
-	if(user?.canUseTopic(src, BE_CLOSE, ismonkey(user)))
+	if(user.canUseTopic(src, BE_CLOSE, NO_DEXTERITY, FALSE, !iscyborg(user)))
 		if(cell_cover_open && cell)
 			remove_cell(user)
 			return

code/modules/clothing/suits/toggles.dm

@@ -110,7 +110,7 @@
 
 /obj/item/clothing/suit/toggle/AltClick(mob/user)
 	..()
-	if(!user.canUseTopic(src, BE_CLOSE, ismonkey(user)))
+	if(!user.canUseTopic(src, BE_CLOSE, NO_DEXTERITY, FALSE, !iscyborg(user)))
 		return
 	else
 		suit_toggle(user)

code/modules/clothing/under/_under.dm

@@ -239,13 +239,12 @@
 	if(.)
 		return
 
-	if(!istype(user) || !user.canUseTopic(src, BE_CLOSE, ismonkey(user)))
+	if(!user.canUseTopic(src, BE_CLOSE, NO_DEXTERITY, FALSE, !iscyborg(user)))
 		return
+	if(attached_accessory)
+		remove_accessory(user)
 	else
-		if(attached_accessory)
-			remove_accessory(user)
-		else
-			rolldown()
+		rolldown()
 
 /obj/item/clothing/under/verb/jumpsuit_adjust()
 	set name = "Adjust Jumpsuit Style"

code/modules/clothing/under/accessories.dm

@@ -73,7 +73,7 @@
 	return
 
 /obj/item/clothing/accessory/AltClick(mob/user)
-	if(istype(user) && user.canUseTopic(src, BE_CLOSE, ismonkey(user)))
+	if(user.canUseTopic(src, BE_CLOSE, NO_DEXTERITY, FALSE, !iscyborg(user)))
 		if(initial(above_suit))
 			above_suit = !above_suit
 			to_chat(user, "[src] will be worn [above_suit ? "above" : "below"] your suit.")

code/modules/mob/dead/observer/observer.dm

@@ -802,7 +802,7 @@ This is the proc mobs get to turn into a ghost. Forked from ghostize due to comp
 
 	update_icon()
 
-/mob/dead/observer/canUseTopic(atom/movable/M, be_close=FALSE, no_dexterity=FALSE, no_tk=FALSE)
+/mob/dead/observer/canUseTopic(atom/movable/M, be_close=FALSE, no_dexterity=FALSE, no_tk=FALSE, need_hands = FALSE, floor_okay=FALSE)
 	return isAdminGhostAI(usr)
 
 /mob/dead/observer/is_literate()

code/modules/mob/living/carbon/alien/alien.dm

@@ -130,8 +130,8 @@ Des: Removes all infected images from the alien.
 		SEND_SIGNAL(new_xeno, COMSIG_NANITE_SYNC, nanites)
 	qdel(src)
 
-/mob/living/carbon/alien/can_hold_items()
-	return ISADVANCEDTOOLUSER(src) && ..()
+/mob/living/carbon/alien/can_hold_items(obj/item/I)
+	return ((I && istype(I, /obj/item/clothing/mask/facehugger)) || (ISADVANCEDTOOLUSER(src) && ..()))
 
 /mob/living/carbon/alien/on_lying_down(new_lying_angle)
 	. = ..()

code/modules/mob/living/carbon/alien/special/facehugger.dm

@@ -54,9 +54,6 @@
 /obj/item/clothing/mask/facehugger/attackby(obj/item/O, mob/user, params)
 	return O.attack_obj(src, user)
 
-/obj/item/clothing/mask/facehugger/attack_alien(mob/user) //can be picked up by aliens
-	return attack_hand(user)
-
 //ATTACK HAND IGNORING PARENT RETURN VALUE
 /obj/item/clothing/mask/facehugger/attack_hand(mob/user)
 	if((stat == CONSCIOUS && !sterile) && !isalien(user))

code/modules/mob/living/carbon/human/human.dm

@@ -807,17 +807,6 @@
 	remove_atom_colour(TEMPORARY_COLOUR_PRIORITY, "#000000")
 	cut_overlay(MA)
 
-/mob/living/carbon/human/canUseTopic(atom/movable/M, be_close=FALSE, no_dexterity=FALSE, no_tk=FALSE, floor_okay=FALSE)
-	if(!(mobility_flags & MOBILITY_UI) && !floor_okay)
-		to_chat(src, "<span class='warning'>You can't do that right now!</span>")
-		return FALSE
-	if(!Adjacent(M) && (M.loc != src))
-		if((be_close == FALSE) || (!no_tk && (dna.check_mutation(TK) && tkMaxRangeCheck(src, M))))
-			return TRUE
-		to_chat(src, "<span class='warning'>You are too far away!</span>")
-		return FALSE
-	return TRUE
-
 /mob/living/carbon/human/resist_restraints()
 	if(wear_suit?.breakouttime)
 		changeNext_move(CLICK_CD_BREAKOUT)

code/modules/mob/living/living.dm

@@ -1115,14 +1115,25 @@
 /mob/living/proc/harvest(mob/living/user) //used for extra objects etc. in butchering
 	return
 
-/mob/living/canUseTopic(atom/movable/M, be_close=FALSE, no_dexterity=FALSE, no_tk=FALSE)
-	if(incapacitated())
+/mob/living/can_hold_items(obj/item/I)
+	return usable_hands && ..()
+
+/mob/living/canUseTopic(atom/movable/M, be_close=FALSE, no_dexterity=FALSE, no_tk=FALSE, need_hands = FALSE, floor_okay=FALSE)
+	if(!(mobility_flags & MOBILITY_UI) && !floor_okay)
 		to_chat(src, "<span class='warning'>You can't do that right now!</span>")
 		return FALSE
-	if(be_close && !in_range(M, src))
-		to_chat(src, "<span class='warning'>You are too far away!</span>")
+	if(be_close && !Adjacent(M) && (M.loc != src))
+		if(no_tk)
+			to_chat(src, "<span class='warning'>You are too far away!</span>")
+			return FALSE
+		var/datum/dna/D = has_dna()
+		if(!D || !D.check_mutation(TK) || !tkMaxRangeCheck(src, M))
+			to_chat(src, "<span class='warning'>You are too far away!</span>")
+			return FALSE
+	if(need_hands && !can_hold_items(isitem(M) ? M : null)) //almost redundant if it weren't for mobs,
+		to_chat(src, "<span class='warning'>You don't have the physical ability to do this!</span>")
 		return FALSE
-	if(!no_dexterity)
+	if(!no_dexterity && !ISADVANCEDTOOLUSER(src))
 		to_chat(src, "<span class='warning'>You don't have the dexterity to do this!</span>")
 		return FALSE
 	return TRUE

code/modules/mob/living/silicon/ai/ai.dm

@@ -802,14 +802,11 @@
 		to_chat(src, "You have been downloaded to a mobile storage device. Remote device connection severed.")
 		to_chat(user, "<span class='boldnotice'>Transfer successful</span>: [name] ([rand(1000,9999)].exe) removed from host terminal and stored within local memory.")
 
-/mob/living/silicon/ai/canUseTopic(atom/movable/M, be_close=FALSE, no_dexterity=FALSE, no_tk=FALSE)
-	if(control_disabled || incapacitated())
+/mob/living/silicon/ai/canUseTopic(atom/movable/M, be_close=FALSE, no_dexterity=FALSE, no_tk=FALSE, need_hands = FALSE, floor_okay=FALSE)
+	if(control_disabled)
 		to_chat(src, "<span class='warning'>You can't do that right now!</span>")
 		return FALSE
-	if(be_close && !in_range(M, src))
-		to_chat(src, "<span class='warning'>You are too far away!</span>")
-		return FALSE
-	return can_see(M) //stop AIs from leaving windows open and using then after they lose vision
+	return can_see(M) && ..() //stop AIs from leaving windows open and using then after they lose vision
 
 /mob/living/silicon/ai/proc/can_see(atom/A)
 	if(isturf(loc)) //AI in core, check if on cameras

code/modules/mob/living/silicon/pai/pai.dm

@@ -203,11 +203,8 @@
 
 // See software.dm for Topic()
 
-/mob/living/silicon/pai/canUseTopic(atom/movable/M, be_close=FALSE, no_dexterity=FALSE, no_tk=FALSE)
-	if(be_close && !in_range(M, src))
-		to_chat(src, "<span class='warning'>You are too far away!</span>")
-		return FALSE
-	return TRUE
+/mob/living/silicon/pai/canUseTopic(atom/movable/M, be_close=FALSE, no_dexterity=FALSE, no_tk=FALSE, need_hands = FALSE, floor_okay=FALSE)
+	return ..(M, be_close, no_dexterity, no_tk, need_hands, TRUE) //Resting is just an aesthetic feature for them.
 
 /mob/proc/makePAI(delold)
 	var/obj/item/paicard/card = new /obj/item/paicard(get_turf(src))

code/modules/mob/living/silicon/robot/inventory.dm

@@ -403,6 +403,6 @@
 /mob/living/silicon/robot/swap_hand()
 	cycle_modules()
 
-/mob/living/silicon/robot/can_hold_items()
-	return FALSE //held_items are used for modules.
+/mob/living/silicon/robot/can_hold_items(obj/item/I)
+	return (I && (I in module.modules)) //Only if it's part of our module.
 

code/modules/mob/living/silicon/robot/robot.dm

@@ -721,14 +721,11 @@
 		if(DISCONNECT) //Tampering with the wires
 			to_chat(connected_ai, "<br><br><span class='notice'>NOTICE - Remote telemetry lost with [name].</span><br>")
 
-/mob/living/silicon/robot/canUseTopic(atom/movable/M, be_close=FALSE, no_dexterity=FALSE, no_tk=FALSE)
-	if(stat || lockcharge || low_power_mode)
+/mob/living/silicon/robot/canUseTopic(atom/movable/M, be_close=FALSE, no_dexterity=FALSE, no_tk=FALSE, need_hands = FALSE, floor_okay=FALSE)
+	if(lockcharge || low_power_mode)
 		to_chat(src, "<span class='warning'>You can't do that right now!</span>")
 		return FALSE
-	if(be_close && !in_range(M, src))
-		to_chat(src, "<span class='warning'>You are too far away!</span>")
-		return FALSE
-	return TRUE
+	return ..()
 
 /mob/living/silicon/robot/updatehealth()
 	..()

code/modules/mob/living/simple_animal/simple_animal.dm

@@ -538,18 +538,6 @@
 		if(target)
 			return new childspawn(target)
 
-/mob/living/simple_animal/canUseTopic(atom/movable/M, be_close=FALSE, no_dexterity=FALSE, no_tk=FALSE)
-	if(incapacitated())
-		to_chat(src, "<span class='warning'>You can't do that right now!</span>")
-		return FALSE
-	if(be_close && !in_range(M, src))
-		to_chat(src, "<span class='warning'>You are too far away!</span>")
-		return FALSE
-	if(!(no_dexterity || dextrous))
-		to_chat(src, "<span class='warning'>You don't have the dexterity to do this!</span>")
-		return FALSE
-	return TRUE
-
 /mob/living/simple_animal/stripPanelUnequip(obj/item/what, mob/who, where)
 	if(!canUseTopic(who, BE_CLOSE))
 		return
@@ -610,7 +598,7 @@
 /mob/living/simple_animal/get_idcard(hand_first)
 	return (..() || access_card)
 
-/mob/living/simple_animal/can_hold_items()
+/mob/living/simple_animal/can_hold_items(obj/item/I)
 	return dextrous && ..()
 
 /mob/living/simple_animal/activate_hand(selhand)

code/modules/mob/mob.dm

@@ -1037,7 +1037,7 @@
 		return TRUE
 
 ///Can the mob use Topic to interact with machines
-/mob/proc/canUseTopic(atom/movable/M, be_close=FALSE, no_dexterity=FALSE, no_tk=FALSE)
+/mob/proc/canUseTopic(atom/movable/M, be_close=FALSE, no_dexterity=FALSE, no_tk=FALSE, need_hands = FALSE, floor_okay=FALSE)
 	return
 
 ///Can this mob use storage
@@ -1190,10 +1190,6 @@
 		return
 	return TRUE
 
-///Can this mob hold items
-/mob/proc/can_hold_items()
-	return length(held_items)
-
 /**
   * Get the mob VV dropdown extras
   */

code/modules/mob/mob_helpers.dm

@@ -546,3 +546,7 @@
 ///Can the mob see reagents inside of containers?
 /mob/proc/can_see_reagents()
 	return stat == DEAD || has_unlimited_silicon_privilege //Dead guys and silicons can always see reagents
+
+///Can this mob hold items
+/mob/proc/can_hold_items(obj/item/I)
+	return length(held_items)

code/modules/paperwork/filingcabinet.dm

@@ -100,7 +100,7 @@
 
 
 /obj/structure/filingcabinet/Topic(href, href_list)
-	if(!usr.canUseTopic(src, BE_CLOSE, ismonkey(usr)))
+	if(!usr.canUseTopic(src, BE_CLOSE, NO_DEXTERITY, FALSE, !iscyborg(usr)))
 		return
 	if(href_list["retrieve"])
 		usr << browse("", "window=filingcabinet") // Close the menu

code/modules/paperwork/paperplane.dm

@@ -121,8 +121,8 @@
 	. = ..()
 	. += "<span class='notice'>Alt-click [src] to fold it into a paper plane.</span>"
 
-/obj/item/paper/AltClick(mob/living/carbon/user, obj/item/I)
-	if(!istype(user) || !user.canUseTopic(src, BE_CLOSE, ismonkey(user)))
+/obj/item/paper/AltClick(mob/living/user, obj/item/I)
+	if(!user.canUseTopic(src, BE_CLOSE, NO_DEXTERITY, FALSE, TRUE))
 		return
 	if(istype(src, /obj/item/paper/carbon))
 		var/obj/item/paper/carbon/Carbon = src

code/modules/projectiles/guns/ballistic/shotgun.dm

@@ -105,7 +105,7 @@
 		to_chat(user, "<span class='notice'>You switch to tube A.</span>")
 
 /obj/item/gun/ballistic/shotgun/automatic/dual_tube/AltClick(mob/living/user)
-	if(!istype(user) || !user.canUseTopic(src, BE_CLOSE, ismonkey(user)))
+	if(!user.canUseTopic(src, BE_CLOSE, NO_DEXTERITY, FALSE, TRUE))
 		return
 	rack()
 
@@ -266,7 +266,7 @@
 	hook = new /obj/item/gun/magic/hook/bounty(src)
 
 /obj/item/gun/ballistic/shotgun/doublebarrel/hook/AltClick(mob/user)
-	if(!istype(user) || !user.canUseTopic(src, BE_CLOSE, ismonkey(user)))
+	if(!user.canUseTopic(src, BE_CLOSE, NO_DEXTERITY, FALSE, TRUE))
 		return
 	if(toggled)
 		to_chat(user,"<span class='notice'>You switch to the shotgun.</span>")

code/modules/reagents/reagent_containers/hypospray.dm

@@ -127,7 +127,7 @@
 		update_icon()
 
 /obj/item/reagent_containers/hypospray/medipen/attack_self(mob/user)
-	if(user.canUseTopic(src, BE_CLOSE, FALSE, NO_TK, FLOOR_OKAY))
+	if(user.canUseTopic(src, BE_CLOSE, FALSE, NO_TK, FALSE, FLOOR_OKAY))
 		inject(user, user)
 
 /obj/item/reagent_containers/hypospray/medipen/update_icon_state()

code/modules/recycling/disposal/bin.dm

@@ -165,8 +165,10 @@
 	user.forceMove(loc)
 	update_icon()
 
-// monkeys and xenos can only pull the flush lever
+// clumsy monkeys and xenos can only pull the flush lever
 /obj/machinery/disposal/attack_paw(mob/user)
+	if(ISADVANCEDTOOLUSER(user))
+		return ..()
 	if(machine_stat & BROKEN)
 		return
 	flush = !flush

code/modules/tgui/states.dm

@@ -89,22 +89,6 @@
 		return UI_DISABLED
 	return ..()
 
-/**
- * public
- *
- * Check the distance for a living mob.
- * Really only used for checks outside the context of a mob.
- * Otherwise, use shared_living_ui_distance().
- *
- * required src_object The object which owns the UI.
- * required user mob The mob who opened/is using the UI.
- *
- * return UI_state The state of the UI.
- */
-/atom/proc/contents_ui_distance(src_object, mob/living/user)
-	// Just call this mob's check.
-	return user.shared_living_ui_distance(src_object)
-
 /**
  * public
  *

code/modules/tgui/states/default.dm

@@ -18,15 +18,10 @@ GLOBAL_DATUM_INIT(default_state, /datum/ui_state/default, new)
 
 /mob/living/default_can_use_topic(src_object)
 	. = shared_ui_interaction(src_object)
-	if(. > UI_CLOSE && loc)
-		. = min(., loc.contents_ui_distance(src_object, src)) // Check the distance...
-	if(. == UI_INTERACTIVE) // Non-human living mobs can only look, not touch.
-		return UI_UPDATE
-
-/mob/living/carbon/human/default_can_use_topic(src_object)
-	. = shared_ui_interaction(src_object)
-	if(. > UI_CLOSE)
+	if(. > UI_CLOSE && loc) //must not be in nullspace.
 		. = min(., shared_living_ui_distance(src_object)) // Check the distance...
+	if(. == UI_INTERACTIVE && !ISADVANCEDTOOLUSER(src)) // unhandy living mobs can only look, not touch.
+		return UI_UPDATE
 
 /mob/living/silicon/robot/default_can_use_topic(src_object)
 	. = shared_ui_interaction(src_object)
@@ -49,14 +44,9 @@ GLOBAL_DATUM_INIT(default_state, /datum/ui_state/default, new)
 		return UI_INTERACTIVE
 	return UI_CLOSE
 
-/mob/living/simple_animal/default_can_use_topic(src_object)
-	. = shared_ui_interaction(src_object)
-	if(. > UI_CLOSE)
-		. = min(., shared_living_ui_distance(src_object)) //simple animals can only use things they're near.
-
 /mob/living/silicon/pai/default_can_use_topic(src_object)
 	// pAIs can only use themselves and the owner's radio.
 	if((src_object == src || src_object == radio) && !stat)
 		return UI_INTERACTIVE
 	else
-		return ..()
+		return min(..(), UI_UPDATE)

code/modules/vehicles/ridden.dm

@@ -45,7 +45,7 @@
 	inserted_key = I
 
 /obj/vehicle/ridden/AltClick(mob/user)
-	if(!inserted_key || !user.canUseTopic(src, BE_CLOSE, ismonkey(user)))
+	if(!inserted_key || !user.canUseTopic(src, BE_CLOSE, NO_DEXTERITY, FALSE, !issilicon(user)))
 		return ..()
 	if(!is_occupant(user))
 		to_chat(user, "<span class='warning'>You must be riding the [src] to remove [src]'s key!</span>")

code/modules/vehicles/wheelchair.dm

@@ -105,7 +105,7 @@
 /obj/vehicle/ridden/wheelchair/proc/can_user_rotate(mob/living/user)
 	var/mob/living/L = user
 	if(istype(L))
-		if(!user.canUseTopic(src, BE_CLOSE, ismonkey(user)))
+		if(!user.canUseTopic(src, BE_CLOSE, NO_DEXTERITY, FALSE, !iscyborg(user)))
 			return FALSE
 	if(isobserver(user) && CONFIG_GET(flag/ghost_interaction))
 		return TRUE