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code/_onclick/hud/hud.dm

@@ -53,6 +53,22 @@ GLOBAL_LIST_INIT(available_ui_styles, list(
 	var/list/hand_slots // /atom/movable/screen/inventory/hand objects, assoc list of "[held_index]" = object
 	var/list/atom/movable/screen/plane_master/plane_masters = list() // see "appearance_flags" in the ref, assoc list of "[plane]" = object
 
+
+	///UI for screentips that appear when you mouse over things
+	var/atom/movable/screen/screentip/screentip_text
+
+	/// Whether or not screentips are enabled.
+	/// This is updated by the preference for cheaper reads than would be
+	/// had with a proc call, especially on one of the hottest procs in the
+	/// game (MouseEntered).
+	var/screentips_enabled = TRUE
+
+	/// The color to use for the screentips.
+	/// This is updated by the preference for cheaper reads than would be
+	/// had with a proc call, especially on one of the hottest procs in the
+	/// game (MouseEntered).
+	var/screentip_color
+
 	var/atom/movable/screen/movable/action_button/hide_toggle/hide_actions_toggle
 	var/action_buttons_hidden = FALSE
 
@@ -83,6 +99,8 @@ GLOBAL_LIST_INIT(available_ui_styles, list(
 		plane_masters["[instance.plane]"] = instance
 		instance.backdrop(mymob)
 
+	screentip_text = new(null, src)
+	static_inventory += screentip_text
 
 /datum/hud/Destroy()
 	if(mymob.hud_used == src)
@@ -117,6 +135,8 @@ GLOBAL_LIST_INIT(available_ui_styles, list(
 	QDEL_LIST(screenoverlays)
 	mymob = null
 
+	QDEL_NULL(screentip_text)
+
 	return ..()
 
 

code/_onclick/hud/screentip.dm

@@ -0,0 +1,19 @@
+/atom/movable/screen/screentip
+	icon = null
+	icon_state = null
+	mouse_opacity = MOUSE_OPACITY_TRANSPARENT
+	screen_loc = "TOP,LEFT"
+	maptext_height = 480
+	maptext_width = 480
+	maptext = ""
+
+/atom/movable/screen/screentip/Initialize(mapload, _hud)
+	. = ..()
+	hud = _hud
+	update_view()
+
+/atom/movable/screen/screentip/proc/update_view(datum/source)
+	SIGNAL_HANDLER
+	if(!hud || !hud.mymob.client.view_size) //Might not have been initialized by now
+		return
+	maptext_width = getviewsize(hud.mymob.client.view_size.getView())[1] * world.icon_size