yea!

code/__DEFINES/dcs/signals/signals_mob/signals_mob_carbon.dm

@@ -1,3 +1,6 @@
+/// from base of [/mob/living/changeNext_Move()] (next_move)
+#define COMSIG_LIVING_CHANGENEXT_MOVE "living_changenext_move"
+
 ///Called from /mob/living/carbon/help_shake_act, before any hugs have ocurred. (mob/living/helper)
 #define COMSIG_CARBON_PRE_HELP_ACT "carbon_pre_help"
 	/// Stops the rest of help act (hugging, etc) from occuring

code/_onclick/click.dm

@@ -29,6 +29,8 @@
 		adj += S.nextmove_adjust()
 	next_move = world.time + ((num + adj)*mod)
 
+	SEND_SIGNAL(src, COMSIG_LIVING_CHANGENEXT_MOVE, next_move)
+
 /**
  * Before anything else, defer these calls to a per-mobtype handler.  This allows us to
  * remove istype() spaghetti code, but requires the addition of other handler procs to simplify it.

code/_onclick/hud/hud.dm

@@ -60,6 +60,8 @@ GLOBAL_LIST_INIT(available_ui_styles, list(
 	var/atom/movable/screen/healths
 	var/atom/movable/screen/healthdoll
 	var/atom/movable/screen/internals
+
+	var/atom/movable/screen/progbar_container/use_timer
 	// subtypes can override this to force a specific UI style
 	var/ui_style
 
@@ -119,6 +121,7 @@ GLOBAL_LIST_INIT(available_ui_styles, list(
 	QDEL_LIST(screenoverlays)
 	mymob = null
 	QDEL_NULL(screentip_text)
+	QDEL_NULL(use_timer)
 
 	return ..()
 

code/_onclick/hud/human.dm

@@ -354,6 +354,10 @@
 	ammo_counter = new /atom/movable/screen/ammo_counter(null, src)
 	infodisplay += ammo_counter
 
+	use_timer = new(null, src)
+	use_timer.RegisterSignal(mymob, COMSIG_LIVING_CHANGENEXT_MOVE, TYPE_PROC_REF(/atom/movable/screen/progbar_container, on_changenext))
+	static_inventory += use_timer
+
 	for(var/atom/movable/screen/inventory/inv in (static_inventory + toggleable_inventory))
 		if(inv.slot_id)
 			inv.hud = src

code/_onclick/hud/screen_objects.dm

@@ -717,3 +717,42 @@
 		intent_icon.pixel_x = 16 * (i - 1) - 8 * length(streak)
 		add_overlay(intent_icon)
 	return ..()
+
+/atom/movable/screen/progbar_container
+	name = "swing cooldown"
+	icon_state = ""
+	screen_loc = "CENTER,SOUTH:16"
+	var/datum/world_progressbar/progbar
+	var/iteration = 0
+
+/atom/movable/screen/progbar_container/Initialize(mapload)
+	. = ..()
+	progbar = new(src)
+	progbar.qdel_when_done = FALSE
+	progbar.bar.vis_flags = VIS_INHERIT_ID | VIS_INHERIT_LAYER | VIS_INHERIT_PLANE
+	progbar.bar.appearance_flags = APPEARANCE_UI
+
+/atom/movable/screen/progbar_container/Destroy()
+	QDEL_NULL(progbar)
+	return ..()
+
+/atom/movable/screen/progbar_container/proc/on_changenext(datum/source, next_move)
+	SIGNAL_HANDLER
+
+	iteration++
+	progbar.goal = next_move - world.time
+	progbar.bar.icon_state = "prog_bar_0"
+
+	progbar_process(next_move)
+
+/atom/movable/screen/progbar_container/proc/progbar_process(next_move)
+	set waitfor = FALSE
+
+	var/start_time = world.time
+	var/iteration = src.iteration
+	while(iteration == src.iteration && (world.time < next_move))
+		progbar.update(world.time - start_time)
+		sleep(1)
+
+	if(iteration == src.iteration)
+		progbar.end_progress()

code/datums/progressbar.dm

@@ -136,5 +136,84 @@
 	QDEL_IN(src, PROGRESSBAR_ANIMATION_TIME)
 
 
+
+/datum/world_progressbar
+	///The progress bar visual element.
+	var/obj/effect/abstract/progbar/bar
+	///The atom who "created" the bar
+	var/atom/movable/owner
+	///Effectively the number of steps the progress bar will need to do before reaching completion.
+	var/goal = 1
+	///Control check to see if the progress was interrupted before reaching its goal.
+	var/last_progress = 0
+	///Variable to ensure smooth visual stacking on multiple progress bars.
+	var/listindex = 0
+	///Does this qdelete on completion?
+	var/qdel_when_done = TRUE
+
+/datum/world_progressbar/New(atom/movable/_owner, _goal, image/underlay)
+	if(!_owner)
+		return
+
+	owner = _owner
+	goal = _goal
+
+	bar = new()
+
+	if(underlay)
+		if(!istype(underlay))
+			underlay = image(underlay, dir = SOUTH)
+			underlay.filters += filter(type = "outline", size = 1)
+
+		underlay.pixel_y += 2
+		underlay.alpha = 200
+		underlay.plane = GAME_PLANE
+		underlay.layer = FLY_LAYER
+		underlay.appearance_flags = APPEARANCE_UI
+		bar.underlays += underlay
+
+	owner:vis_contents += bar
+
+	animate(bar, alpha = 255, time = PROGRESSBAR_ANIMATION_TIME, easing = SINE_EASING)
+
+	RegisterSignal(owner, COMSIG_PARENT_QDELETING, PROC_REF(owner_delete))
+
+/datum/world_progressbar/Destroy()
+	owner = null
+	QDEL_NULL(bar)
+	return ..()
+
+
+/datum/world_progressbar/proc/owner_delete()
+	qdel(src)
+
+///Updates the progress bar image visually.
+/datum/world_progressbar/proc/update(progress)
+	progress = clamp(progress, 0, goal)
+	if(progress == last_progress)
+		return
+	last_progress = progress
+	bar.icon_state = "prog_bar_[round(((progress / goal) * 100), 5)]"
+
+/datum/world_progressbar/proc/end_progress()
+	if(last_progress != goal)
+		bar.icon_state = "[bar.icon_state]_fail"
+
+	if(qdel_when_done)
+		animate(bar, alpha = 0, time = PROGRESSBAR_ANIMATION_TIME)
+		QDEL_IN(src, PROGRESSBAR_ANIMATION_TIME)
+	else
+		bar.icon_state = "prog_bar_0"
+
 #undef PROGRESSBAR_ANIMATION_TIME
 #undef PROGRESSBAR_HEIGHT
+
+/obj/effect/abstract/progbar
+	icon = 'icons/effects/progressbar.dmi'
+	icon_state = "prog_bar_0"
+	plane = ABOVE_HUD_PLANE
+	appearance_flags = APPEARANCE_UI | KEEP_APART
+	pixel_y = 32
+	alpha = 0
+	mouse_opacity = MOUSE_OPACITY_TRANSPARENT
+	vis_flags = NONE //We don't want VIS_INHERIT_PLANE