MVVM in Godot

array_resource.gd

class_name ArrayResource
extends Resource

var _values = []:
	set(value):
		_values = value
		emit_changed()
	
func _init(initial_values: Array = []) -> void:
	if not initial_values.is_empty():
		_values = initial_values
		
func add_value(value) -> void:
	_values.push_back(value)
	emit_changed()

func insert(pos, value) -> void:
	_values.insert(position, value)
	emit_changed()

func remove_value(value) -> void:
	_values.erase(value)
	emit_changed()

func remove_at(pos) -> void:
	_values.remove_at(pos)
	emit_changed()

func append_values(values) -> void:
	_values.append_array(values)
	emit_changed()

func push_back(value) -> void:
	_values.push_back(value)
	emit_changed()

bound_container.gd

class_name BoundContainer
extends BoxContainer # Can update this to whatever you want; this allows both vertical and horizontal containment

@export_file("*.tscn") var ItemTemplate

var items: ArrayResource:
	set(value):
		if null != value and null != ItemTemplate:
			items = value
			items.changed.connect(_on_items_changed, CONNECT_REFERENCE_COUNTED)
			_load_items()


func _load_items() -> void:
	if nulll == ItemTemplate:
		return

	for item in items._values:
		var item_view = load(ItemTemplate).instantiate()
		add_child(item_view)
		item_view.set_deferred("data", item)

# The ugliest way to handle this, but probably the most efficient coding-wise
func _on_items_changed() -> void:
	for child in get_children():
		child.free()
	
	_load_items()

bound_label.gd

class_name BoundLabel
extends Label

func bind_property(property: PropertyResource) -> void:
	property.changed.connect(func(): text = str(property.Value))
	text = str(property.Value)

# I will create more Bound-* controls in the future and release this as a full library. For the time being, I'm teasing out the full design of my game that uses this still, and prefer to only build controls and libraries out of necessity, rather than a misguided belief that anyone else gives a damn about my libraries.

property_resource.gd

class_name PropertyResource
extends Resource

var Value: Variant:
	set(value):
		Value = value
		emit_changed()
	
func _init(value) -> void:
	Value = value