Typing indicators

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

@@ -106,6 +106,9 @@ GLOBAL_LIST_EMPTY(roundstart_race_names)
 	var/whitelist = list() 		//List the ckeys that can use this species, if it's whitelisted.: list("John Doe", "poopface666", "SeeALiggerPullTheTrigger") Spaces & capitalization can be included or ignored entirely for each key as it checks for both.
 	var/should_draw_citadel = FALSE
 
+	/// Our default override for typing indicator state
+	var/typing_indicator_state
+
 ///////////
 // PROCS //
 ///////////
@@ -2218,3 +2221,8 @@ GLOBAL_LIST_EMPTY(roundstart_race_names)
 /datum/species/proc/start_wagging_tail(mob/living/carbon/human/H)
 
 /datum/species/proc/stop_wagging_tail(mob/living/carbon/human/H)
+
+
+/////// TYPING INDICATORS ///////
+/datum/species/proc/get_typing_indicator_state()
+	return typing_indicator_state

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

@@ -0,0 +1,2 @@
+/mob/living/carbon/human/get_typing_indicator_icon_state()
+	return dna?.species?.get_typing_indicator_state() || ..()

code/modules/mob/living/say.dm

@@ -354,7 +354,7 @@ GLOBAL_LIST_INIT(department_radio_keys, list(
 
 	if(cultslurring)
 		message = cultslur(message)
-	
+
 	if(clockcultslurring)
 		message = CLOCK_CULT_SLUR(message)
 

code/modules/mob/mob_defines.dm

@@ -128,3 +128,13 @@
 
 	var/flavor_text = ""
 	var/flavor_text_2 = "" //version of the above that only lasts for the current round.
+
+	///////TYPING INDICATORS///////
+	/// Set to true if we want to show typing indicators.
+	var/typing_indicator_enabled = FALSE
+	/// Default icon_state of our typing indicator. Currently only supports paths (because anything else is, as of time of typing this, unnecesary.
+	var/typing_indicator_state = /obj/effect/overlay/typing_indicator
+	/// The timer that will remove our indicator for early aborts (like when an user finishes their message)
+	var/typing_indicator_timerid
+	/// Default typing indicator timeout
+	var/typing_indicator_timeout = 30 SECONDS

code/modules/mob/typing_indicator.dm

@@ -0,0 +1,44 @@
+/// state = overlay/image/object/type/whatever add_overlay will accept
+GLOBAL_LIST_EMPTY(typing_indicator_overlays)
+
+/// Fetches the typing indicator we'll use from GLOB.typing_indicator_overlays
+/mob/proc/get_indicator_overlay(state)
+	. = GLOB.typing_indicator_overlays[state]
+	if(.)
+		return
+	// doesn't exist, make it and cache it
+	if(ispath(state))
+		. = GLOB.typing_indicator_overlays[state] = state
+	// We only support paths for now because anything else isn't necessary yet.
+
+/// Gets the state we will use for typing indicators. Defaults to src.typing_indicator_state
+/mob/proc/get_typing_indicator_icon_state()
+	return typing_indicator_state
+
+/*!
+ * Displays typing indicator.
+ * @param timeout_override - Sets how long until this will disappear on its own without the user finishing their message or logging out. Defaults to src.typing_indicator_timeout
+ * @param state_override - Sets the state that we will fetch. Defaults to src.get_typing_indicator_icon_state()
+ * @param force - shows even if src.typing_indcator_enabled is FALSE.
+ */
+/mob/proc/display_typing_indicator(timeout_override = typing_indicator_timeout, state_override = get_typing_indicator_icon_state(), force = FALSE)
+	if(!typing_indicator_enabled || force)
+		return
+	add_overlay(get_indicator_overlay(state_override))
+	addtimer(CALLBACK(src, .proc/clear_typing_indicator, state_override), timeout_override, TIMER_STOPPABLE)
+
+/*!
+ * Removes typing indicator.
+ * @param state_override Sets the state that we will remove. Defaults to src.get_typing_indicator_icon_state()
+ */
+/mob/proc/clear_typing_indicator(state_override = get_typing_indicator_icon_state())
+	deltimer(typing_indicator_timerid)
+	cut_overlay(get_indicator_overlay(state_override))
+
+/// Default typing indicator
+/obj/effect/overlay/typing_indicator
+	mouse_opacity = MOUSE_OPACITY_TRANSPARENT
+	icon = 'icons/mob/talk.dmi'
+	icon_state = "default_typing"
+	appearance_flags = RESET_COLOR | TILE_BOUND | PIXEL_SCALE
+	layer = LARGE_MOB_LAYER