Accessory Weight Handling (#19309)

* Added a system that lets accessories increase the weight class / size
of the items they attach to. Currently only implemented on modular
armour's arm and leg guards, which will now not fit into bags if those
are attached.

code/__DEFINES/accessories.dm

@@ -1,3 +1,5 @@
+// Accesssory Slots
+
 #define ACCESSORY_SLOT_GENERIC			"decor"
 #define ACCESSORY_SLOT_UTILITY			"utility"
 #define ACCESSORY_SLOT_UTILITY_MINOR	"minor utility"
@@ -9,3 +11,14 @@
 #define ACCESSORY_SLOT_ARMOR_PIN		"armor pin"
 #define ACCESSORY_SLOT_ARMOR_POCKETS 	"armor pockets"
 #define ACCESSORY_SLOT_HEAD             "head"
+
+// Accessory Weight Classes
+
+/// Doesn't increase size
+#define ACCESSORY_WEIGHT_NONE 0
+
+/// Two accessories can be attached but will only increase size by one
+#define ACCESSORY_WEIGHT_HALF_UNIT 0.5
+
+// This accessory will increase the size by one
+#define ACCESSORY_WEIGHT_ONE_UNIT 1

code/modules/clothing/clothing_accessories.dm

@@ -115,6 +115,7 @@
 	update_clothing_icon()
 	update_accessory_slowdown()
 	recalculate_body_temperature_change()
+	recalculate_item_size()
 
 /obj/item/clothing/proc/remove_accessory(mob/user, obj/item/clothing/accessory/A)
 	if(!(A in accessories))
@@ -125,6 +126,15 @@
 	update_clothing_icon()
 	update_accessory_slowdown()
 	recalculate_body_temperature_change()
+	recalculate_item_size()
+
+/obj/item/clothing/proc/recalculate_item_size()
+	w_class = initial(w_class)
+
+	for(var/obj/item/clothing/accessory/accessory as anything in accessories)
+		w_class += accessory.accessory_w_class_adjustment
+
+	w_class = Clamp(Ceil(w_class), ITEMSIZE_TINY, ITEMSIZE_IMMENSE)
 
 /obj/item/clothing/proc/removetie_verb()
 	set name = "Remove Accessory"

code/modules/clothing/under/accessories/accessory.dm

@@ -7,7 +7,12 @@
 	overlay_state = null
 	slot_flags = SLOT_TIE
 	w_class = ITEMSIZE_SMALL
+
 	var/slot = ACCESSORY_SLOT_GENERIC
+
+	/// When attached to another piece of clothing, it'll increase the size by this amount. Accepts the ACCESSORY_WEIGHT_* define, which can be found in code/__DEFINES/accessories.dm. The final result is rounded up
+	var/accessory_w_class_adjustment = ACCESSORY_WEIGHT_NONE
+
 	var/obj/item/clothing/has_suit = null		//the suit the tie may be attached to
 	var/image/inv_overlay = null	//overlay used when attached to clothing.
 	var/overlay_in_inventory = TRUE // Whether the worn_overlay should apply when attached to an item of clothing.

code/modules/clothing/under/accessories/armor.dm

@@ -8,6 +8,7 @@
 	item_state = "legguards_sec"
 	contained_sprite = TRUE
 	slot = ACCESSORY_SLOT_LEG_GUARDS
+	accessory_w_class_adjustment = ACCESSORY_WEIGHT_HALF_UNIT
 	w_class = ITEMSIZE_NORMAL
 	armor = list(
 		melee = ARMOR_MELEE_KEVLAR,
@@ -148,6 +149,7 @@
 	item_state = "armguards_sec"
 	contained_sprite = TRUE
 	slot = ACCESSORY_SLOT_ARM_GUARDS
+	accessory_w_class_adjustment = ACCESSORY_WEIGHT_HALF_UNIT
 	body_parts_covered = HANDS|ARMS
 	armor = list(
 		melee = ARMOR_MELEE_KEVLAR,