Populate custom dropdown export in tool script

[dweipert]

Godot Version

v4.4.stable.arch_linux

Question

So following my problem from last year:

Select node via @export in Editor in different scene

Godot Version 4.2.1 Question I’m working on scene transitions. So the Area for the transition is in World1, the target position is in World2. Currently in the “SceneTransition.gd” I’m using @export_file() var sceneFilePath @export var targetPlayerPosition: String Later I load the scene, instantiate it, add the player-node and set its position to the position of the node under NodePath(targetPlayerPosition). Ideally I’d like to select the node path directly in the editor in World2.tscn. But …

I had a similar idea again, but now have a bit more of an idea how to go about it.
I instantiate the foreign scene and go through its children and populate a dropdown with the potential paths to choose from.

This is what I got so far:

@tool
class_name MapConnectionMarker
extends Marker2D


@export_file("*.tscn") var map_path: String: set = set_map_path
@export_custom(PROPERTY_HINT_ENUM, "") var connection: String
@export_tool_button("Regenerate List", "Marker2D") var regenerate_list_action = regenerate_list


func set_map_path(value: String) -> void:
	map_path = value
	regenerate_list()


func regenerate_list() -> void:
	if not map_path:
		return # TODO: clear list
	
	var map: Map = load(map_path).instantiate()
	for child in map.find_children("*", "MapConnectionMarker"):
		child.get_path()
		# TODO: where to add the paths to so they appear in the dropdown?

It at least looks like what I had in mind,

but I can’t figure out where to add the node paths to, so they appear in the dropdown.

[dweipert]

Okay finally managed to do it.

I had to use _get_property_list to effectively populate a custom enum export per code.

This is my working solution:

@tool
class_name MapConnectionMarker
extends Marker2D


@export_file("*.tscn") var map_path: String
var connection: String


func _get_property_list() -> Array[Dictionary]:
	var list: Array[Dictionary] = []
	
	if map_path:
		var map: Map = load(map_path).instantiate()
		
		var paths := []
		for child in map.find_children("*", "MapConnectionMarker"):
			paths.append(map.get_path_to(child))
		
		list.append({
			"name": "connection",
			"type": TYPE_STRING,
			"hint": PROPERTY_HINT_ENUM,
			"hint_string": ",".join(paths)
		})
	
	return list