Editor does not fire a NOTIFICATION_TRANSFORM_CHANGED to _notification(what), when used in EditorPlugin plugin class to move a node

[wyattbiker]

Tested versions

v4.4.1.stable.official [49a5bc7]

System information

Kubuntu 24.04 KDE Plasma Version: 5.27.12

Issue description

Editor does not fire a NOTIFICATION_TRANSFORM_CHANGED to _notification(what), when used in EditorPlugin plugin class to move a node in editor.

Steps to reproduce

1. Create empty Node3D
2. Create child MeshInstance3D box meshes.
3. Add plugin.gd and .cfg code (see below) to addons subfolder editor_notif
4. Enable plugin
5. Select a MeshInstance node and move it using the gizmo.
6. Noticed that _notification() callback does not detect the position change

plugin.gd

@tool
extends EditorPlugin

var selected_node:Node3D

func _enter_tree():
	# Get the EditorInterface singleton.
	var editor_interface = get_editor_interface()
	# Connect to the selection_changed signal.
	editor_interface.get_selection().connect("selection_changed", Callable(self, "_on_selection_changed"))
	
func _exit_tree():
	# Disconnect the signal when the plugin is removed.
	var editor_interface = get_editor_interface()
	editor_interface.get_selection().disconnect("selection_changed", Callable(self, "_on_selection_changed"))

func _on_selection_changed():
	# Get the currently selected nodes.
	var selected_nodes = get_editor_interface().get_selection().get_selected_nodes()
	# Check if any nodes are selected.
	if selected_nodes.size() > 0:
		# Get the first selected node.
		print("\n\nClass:", selected_nodes[0].get_class())
		selected_node = selected_nodes[0]
		print("Selected node: ", selected_node, " ",selected_node.basis)
		# Node's 'mesh' property is not null
		selected_node.set_notify_transform(true)
		selected_node.set_notify_local_transform(true)
	else:
		selected_node = null
		print("No node selected.")

func _notification(what):
	if what == selected_node.NOTIFICATION_TRANSFORM_CHANGED:
		print("Global transform changed")
	elif what == selected_node.NOTIFICATION_LOCAL_TRANSFORM_CHANGED:
		print("Local transform changed")

plugin.cfg

[plugin]

name="editor_notif"
description="notif"
author="wyattbiker"
version="1.0-BETA"
script="plugin.gd"

Minimal reproduction project (MRP)

editor_notif Plugin Zip

Extract to addons/ folder called editor_notif. Enable in Project > Plugins

Archive.zip

[Rindbee]

• NOTIFICATION_TRANSFORM_CHANGED is specific to CanvasItem/Node3D;
• There is no inheritance relationship between EditorPlugin and CanvasItem/Node3D;

So EditorPlugin's _notification() will not receive notifications of type NOTIFICATION_TRANSFORM_CHANGED. This is as expected.

Not sure about your specific intention, maybe you can try to listen indirectly through the history_changed signal of EditorUndoRedoManager.