Lootpanel Improvements (#94995)

## About The Pull Request

Makes the lootpanel act like you'd expect it to.

## Why It's Good For The Game

You should not need to manually refresh the loot panel. You should not
be able to monitor a turf on the other side of the station.

## Changelog

🆑
fix: The lootpanel will now properly close with distance from the target
like most other tguis.
qol: The lootpanel will now automatically refresh when new items enter
it. Removed the manual refresh button.
/🆑

Co-authored-by: Jordan Dominion <Cyberboss@users.noreply.github.com>

code/modules/lootpanel/_lootpanel.dm

@@ -38,9 +38,14 @@
 		ui.open()
 
 
+/datum/lootpanel/ui_host(mob/user)
+	return source_turf
+
+
 /datum/lootpanel/ui_close(mob/user)
 	. = ..()
 
+	UnregisterSignal(source_turf, COMSIG_ATOM_ENTERED)
 	source_turf = null
 	reset_contents()
 
@@ -55,13 +60,6 @@
 	return data
 
 
-/datum/lootpanel/ui_status(mob/user, datum/ui_state/state)
-	if(user.incapacitated)
-		return UI_DISABLED
-
-	return UI_INTERACTIVE
-
-
 /datum/lootpanel/ui_act(action, list/params, datum/tgui/ui, datum/ui_state/state)
 	. = ..()
 	if(.)
@@ -70,7 +68,5 @@
 	switch(action)
 		if("grab")
 			return grab(usr, params)
-		if("refresh")
-			return populate_contents()
 
 	return FALSE

code/modules/lootpanel/contents.dm

@@ -21,19 +21,38 @@
 		if(!istype(thing))
 			stack_trace("Non-atom in the contents of [source_turf]!")
 			continue
-		if(QDELETED(thing))
-			continue
-		if(thing.mouse_opacity == MOUSE_OPACITY_TRANSPARENT)
-			continue
-		if(thing.IsObscured())
-			continue
-		if(thing.invisibility > owner.mob.see_invisible)
-			continue
 
-		// convert
-		var/datum/search_object/index = new(owner, thing)
-		add_to_index(index)
+		add_new_searchable(thing, FALSE)
 
+	queue_update()
+
+/datum/lootpanel/proc/on_source_turf_entered(datum/source, atom/movable/arrived, atom/old_loc, list/atom/old_locs)
+	SIGNAL_HANDLER
+
+	// async because the same move handler we register with this can trigger on the /datum/search_object later in this event
+	// deleting it just as we added it
+	addtimer(CALLBACK(src, PROC_REF(add_new_searchable), arrived, TRUE), 0)
+
+/datum/lootpanel/proc/add_new_searchable(atom/movable/thing, from_signal)
+	if(QDELETED(thing))
+		return
+	if(thing.mouse_opacity == MOUSE_OPACITY_TRANSPARENT)
+		return
+	if(thing.IsObscured())
+		return
+	if(thing.invisibility > owner.mob.see_invisible)
+		return
+	if(from_signal && (!source_turf || !(thing in source_turf.contents)))
+		return
+
+	// convert
+	var/datum/search_object/index = new(owner, thing)
+	add_to_index(index)
+
+	if(from_signal)
+		queue_update()
+
+/datum/lootpanel/proc/queue_update()
 	var/datum/tgui/window = SStgui.get_open_ui(owner.mob, src)
 	window?.send_update()
 

code/modules/lootpanel/misc.dm

@@ -1,5 +1,10 @@
 /// Helper to open the panel
 /datum/lootpanel/proc/open(turf/tile)
+	if (tile != source_turf)
+		if (source_turf)
+			UnregisterSignal(source_turf, COMSIG_ATOM_ENTERED)
+		RegisterSignal(tile, COMSIG_ATOM_ENTERED, PROC_REF(on_source_turf_entered))
+
 	source_turf = tile
 
 #if !defined(OPENDREAM) && !defined(UNIT_TESTS)