Cleaned and improved some event stuff

scripts/Singleton/UISystem.gd

@@ -4,13 +4,36 @@ var QUEST_MENU:QuestMenu
 var DEBUG_MENU:DebugMenu
 var INVENTORY_MENU:FullInventoryMenu
 var EVENT_FLAG_MENU:EventFlagMenu
+var VN_TEXTBOX:VNTextbox
 
 func _ready() -> void:
 	QUEST_MENU = $QuestMenu
 	DEBUG_MENU = $DebugMenu
 	INVENTORY_MENU = $FullInventory
 	EVENT_FLAG_MENU = $EventFlagMenu
+	VN_TEXTBOX = $VNTextbox
 
 func _process(delta: float) -> void:
 	# This needs to always be at the end of the parent node's tree
 	get_parent().move_child(self, get_parent().get_child_count() - 1)
+
+func hasInteractionFocus() -> bool:
+	# Returns true if the UI system has focus, basically if any UI menu or 
+	# element is open in a way that prevents interaction with the game world.
+	
+	if QUEST_MENU.isOpen():
+		return true
+
+	if DEBUG_MENU.isOpen():
+		return true
+
+	if INVENTORY_MENU.isOpen():
+		return true
+
+	if EVENT_FLAG_MENU.isOpen():
+		return true
+
+	if !VN_TEXTBOX.isClosed:
+		return true
+
+	return false