Injector and Coagulator plates now function (#7173)

# About the pull request
made the plates actually work.
Fixes  #7142

All code was made by kiVts, I just took the code and made a PR for them
now because #7023 is on draft until it's done.
<!-- Remove this text and explain what the purpose of your PR is.

Mention if you have tested your changes. If you changed a map, make sure
you used the mapmerge tool.
If this is an Issue Correction, you can type "Fixes Issue #169420" to
link the PR to the corresponding Issue number #169420.

Remember: something that is self-evident to you might not be to others.
Explain your rationale fully, even if you feel it goes without saying.
-->

# Explain why it's good for the game

The things that research spends biomass points on should work???
# Testing Photographs and Procedure
tested on a private server, stabbed myself a few times with a knife, no
bloodloss, injector plate works (with all OD modes functional).


# Changelog
:cl: Private-Tristan, KiVts
fix: Injector and Coagulator plates are now functional.
/:cl:

code/__DEFINES/dcs/signals/atom/signals_obj.dm

@@ -2,6 +2,10 @@
 // Sent after the limb has taken damage
 #define COMSIG_LIMB_TAKEN_DAMAGE "limb_taken_damage"
 
+// From /datum/effects/bleeding/internal/process_mob() and /datum/effects/bleeding/external/process_mob()
+#define COMSIG_BLEEDING_PROCESS "bleeding_process"
+	#define COMPONENT_BLEEDING_CANCEL (1<<0)
+
 /// From /obj/effect/alien/weeds/Initialize()
 #define COMSIG_WEEDNODE_GROWTH_COMPLETE "weednode_growth_complete"
 /// From /obj/effect/alien/weeds/Initialize()

code/datums/effects/bleeding.dm

@@ -81,6 +81,8 @@
 				if(affected_human.chem_effect_flags & CHEM_EFFECT_NO_BLEEDING)
 					buffer_blood_loss = 0
 					return FALSE
+				if(SEND_SIGNAL(affected_human, COMSIG_BLEEDING_PROCESS, FALSE) & COMPONENT_BLEEDING_CANCEL)
+					return FALSE
 		affected_mob.drip(buffer_blood_loss)
 		buffer_blood_loss = 0
 
@@ -111,6 +113,8 @@
 		if(istype(affected_human))
 			if(affected_human.chem_effect_flags & CHEM_EFFECT_NO_BLEEDING)
 				return FALSE
+			if(SEND_SIGNAL(affected_human, COMSIG_BLEEDING_PROCESS, TRUE) & COMPONENT_BLEEDING_CANCEL)
+				return FALSE
 
 	blood_loss = max(blood_loss, 0) // Bleeding shouldn't give extra blood even if its only 1 tick
 	affected_mob.blood_volume = max(affected_mob.blood_volume - blood_loss, 0)

code/modules/cm_tech/implements/armor.dm

@@ -271,26 +271,25 @@
 
 /obj/item/clothing/accessory/health/research_plate/coagulator/on_attached(obj/item/clothing/S, mob/living/carbon/human/user)
 	. = ..()
-	if (user.chem_effect_flags & CHEM_EFFECT_NO_BLEEDING)
-		return
-	user.chem_effect_flags |= CHEM_EFFECT_NO_BLEEDING
+	RegisterSignal(user, COMSIG_BLEEDING_PROCESS, PROC_REF(cancel_bleeding))
 	to_chat(user, SPAN_NOTICE("You feel tickling as you activate [src]."))
 
+/obj/item/clothing/accessory/health/research_plate/coagulator/proc/cancel_bleeding()
+	SIGNAL_HANDLER
+	return COMPONENT_BLEEDING_CANCEL
+
 /obj/item/clothing/accessory/health/research_plate/coagulator/on_removed(mob/living/carbon/human/user, obj/item/clothing/C)
 	. = ..()
-	if (user.chem_effect_flags & CHEM_EFFECT_NO_BLEEDING)
-		user.chem_effect_flags &= CHEM_EFFECT_NO_BLEEDING
-		to_chat(user, SPAN_NOTICE("You feel [src] peeling off from your skin."))
-		attached_uni = null
+	to_chat(user, SPAN_NOTICE("You feel [src] peeling off from your skin."))
+	UnregisterSignal(user, COMSIG_BLEEDING_PROCESS)
+	attached_uni = null
 
 /obj/item/clothing/accessory/health/research_plate/coagulator/on_removed_sig(mob/living/carbon/human/user, slot)
 	. = ..()
 	if(. == FALSE)
 		return
-	if(user.chem_effect_flags & CHEM_EFFECT_NO_BLEEDING)
-		to_chat(user, SPAN_NOTICE("You feel [src] peeling off from your skin."))
-		user.chem_effect_flags &= CHEM_EFFECT_NO_BLEEDING
-		attached_uni = null
+	UnregisterSignal(user, COMSIG_BLEEDING_PROCESS)
+	attached_uni = null
 
 /obj/item/clothing/accessory/health/research_plate/emergency_injector
 	name = "emergency chemical plate"
@@ -350,7 +349,7 @@
 /obj/item/clothing/accessory/health/research_plate/emergency_injector/on_attached(obj/item/clothing/S, mob/living/carbon/human/user)
 	. = ..()
 	wearer = user
-	activation = new /datum/action/item_action/emergency_plate/inject_chemicals(src, attached_uni)
+	activation = new /datum/action/item_action/toggle/emergency_plate/inject_chemicals(src, attached_uni)
 	activation.give_to(wearer)
 
 /obj/item/clothing/accessory/health/research_plate/emergency_injector/on_removed(mob/living/user, obj/item/clothing/C)
@@ -366,7 +365,7 @@
 	attached_uni = null
 
 //Action buttons
-/datum/action/item_action/emergency_plate/inject_chemicals/New(Target, obj/item/holder)
+/datum/action/item_action/toggle/emergency_plate/inject_chemicals/New(Target, obj/item/holder)
 	. = ..()
 	name = "Inject Emergency Plate"
 	action_icon_state = "plate_research"