Some changes

cutscene/item/ItemAction.gd

@@ -1,18 +1,29 @@
 class_name ItemAction
-const ConversationAction = preload("res://cutscene/conversation/ConversationAction.gd")
+const DialogueAction = preload("res://cutscene/dialogue/DialogueAction.gd")
+
+# Passed as extra_game_states so {{item_name}} and {{quantity}} resolve in the .dialogue file.
+class ItemDialogueState:
+  var item_name:String
+  var quantity:int
+  func _init(name:String, qty:int) -> void:
+    item_name = name
+    quantity = qty
+
+static var PICKUP_DIALOGUE:DialogueResource = preload("res://dialogue/item/pickup.dialogue")
 
 static func itemGetCallable(params:Dictionary) -> int:
   assert(params.has('stack'))
-  PARTY.BACKPACK.addStack(params['stack'])
-  
-  var text = "Obtained %s x%d." % [Item.getItemName(params['stack'].item), params['stack'].quantity]
-  params['cutscene'].addCallable(ConversationAction.getTextboxCallable(text).merged({
-    'position': Cutscene.CUTSCENE_ADD_NEXT,
-  }))
+  var stack:ItemStack = params['stack']
+  PARTY.BACKPACK.addStack(stack)
+
+  var state = ItemDialogueState.new(Item.getItemName(stack.item), stack.quantity)
+  var dialogueParams:Dictionary = DialogueAction.getDialogueCallable(PICKUP_DIALOGUE, 'start', [state])
+  dialogueParams['position'] = Cutscene.CUTSCENE_ADD_NEXT
+  params['cutscene'].addCallable(dialogueParams)
   return Cutscene.CUTSCENE_CONTINUE
 
 static func getItemCallable(itemStack:ItemStack) -> Dictionary:
   return {
-    "function": itemGetCallable,
-    "stack": itemStack
+    'function': itemGetCallable,
+    'stack': itemStack,
   }