First commit 🎉

addons/popochiu/editor/popups/create_object/create_region/create_region.gd

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+@tool
+extends "res://addons/popochiu/editor/popups/create_object/create_room_object.gd"
+## Allows you to create a new Region for a room.
+
+var _new_region_name := ""
+var _factory: PopochiuRegionFactory
+
+
+#region Godot ######################################################################################
+func _ready() -> void:
+	_group_folder = "regions"
+	_info_files = _info_files.replace("&t", "region")
+	
+	super()
+
+
+#endregion
+
+#region Virtual ####################################################################################
+func _create() -> Object:
+	if _new_region_name.is_empty():
+		error_feedback.show()
+		return null
+	
+	# Setup the region helper and use it to create the region --------------------------------------
+	_factory = PopochiuRegionFactory.new()
+	var param := PopochiuRegionFactory.PopochiuRegionFactoryParam.new()
+	param.obj_name = _new_region_name
+	param.room = _room
+	
+	if _factory.create(param) != ResultCodes.SUCCESS:
+		# TODO: show a message in the popup!
+		return null
+	await get_tree().create_timer(0.1).timeout
+	
+	return _factory.get_obj_scene()
+
+
+func _set_info_text() -> void:
+	_new_region_name = _name.to_snake_case()
+	_target_folder = _group_folder % _new_region_name
+	info.text = _info_text.replace("&n", _new_region_name)
+
+
+#endregion

addons/popochiu/editor/popups/create_object/create_region/create_region.gd.uid

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+uid://dwjd4cv7i2mh

addons/popochiu/editor/popups/create_object/create_region/create_region.tscn

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+[gd_scene load_steps=3 format=3 uid="uid://crtkojrvhklpp"]
+
+[ext_resource type="PackedScene" uid="uid://c1pfl2gwjjot5" path="res://addons/popochiu/editor/popups/create_object/create_object.tscn" id="1_haco6"]
+[ext_resource type="Script" path="res://addons/popochiu/editor/popups/create_object/create_region/create_region.gd" id="2_ft6um"]
+
+[node name="CreateRegionConfirmation" instance=ExtResource("1_haco6")]
+script = ExtResource("2_ft6um")
+
+[node name="Label" parent="PanelContainer/VBoxContainer/InputContainer" index="0"]
+text = "Region name:"
+
+[node name="Guide" parent="PanelContainer/VBoxContainer" index="3"]
+text = "Use a descriptive name in PascalCase (e.g. Sand, StickyFloor)."